CN208690920U - Alternating current generator and its overload protecting circuit - Google Patents
Alternating current generator and its overload protecting circuit Download PDFInfo
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- CN208690920U CN208690920U CN201820710555.9U CN201820710555U CN208690920U CN 208690920 U CN208690920 U CN 208690920U CN 201820710555 U CN201820710555 U CN 201820710555U CN 208690920 U CN208690920 U CN 208690920U
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Abstract
The utility model discloses a kind of overload protecting circuit, including voltage sampling circuit and trigger circuit, the voltage sampling circuit includes first voltage sampling module and second voltage sampling module, for carrying out voltage signal sampling to two electrical voltage points respectively；The first voltage sampling module and second voltage sampling module are also connect with the trigger circuit, to handle the voltage signal collected；Compared with prior art, the utility model with overload protecting circuit and has the characteristics of overload protecting circuit, low in energy consumption, applied widely, good reliability.
Description
Technical field
The present invention relates to AC Motor Control technical field, be especially a kind of alternating current generator on shredder and its
Overload protecting circuit.
Background technique
Alternating current generator is a kind of for realizing that the rotating electromagnetic that electric energy and mechanical energy mutually convert is mechanical.It is in the prior art
Alternating current generator is typically provided overload protecting circuit, when guaranteeing alternating current generator overload, can pass through sampling feedback and find in time and voluntarily
Motor is adjusted or stops, to achieve the purpose that protect alternating current generator.
The ac motor structure of the prior art is as shown in Figure 1.K1A and K2A is the relay for controlling motor forward/reverse,
Cement resistor R1 is the sampling resistor being connected in alternating current generator circuit.When alternating current generator work, there is electric current to pass through alternating current
Machine and cement resistor R1, the electric current on cement resistor R1 are equal to the operating current of motor, which will be at the both ends cement resistor R1
Generate pressure drop U.Since the electric current of motor increases with load and increase, pressure drop U is directly proportional to the load of motor.As pressure drop U
When increasing to the series circuit work that the voltage triggered at the subsequent both ends C7 can be caused to be made of R2 and U1 luminous end, so that U1 shines
When end shines, OVERLOAD signal will be lower level by high level, be also equivalent to produce overload signal and be fed back to alternating current
Machine, and then carry out itself and adjust or stop working.Above-mentioned current sample structure carries out the alternating current generator of overload protection at work
There is following deficiency:
One, the cement resistor that sampling is used is as a high power device, and not only power consumption is high, but also impacts in motor high current
Under be easily damaged.
Two, since the operating current of every kind of product is different, therefore every money product requires to carry out parameter regulation, so as to cause
Its scope of application is small.
Three, it is influenced by the characteristic of induction machine, when motor is by unexpected heavy load impact condition, is easy to produce and is rotating forward
In the case where, there is rapidly reversal development in motor.At this time since current sample speed is slower, it is easy to omit information carrying
Number, the erroneous judgement of circuit is caused, and then influence the reliability of alternating current generator.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of overload protecting circuit and the friendship with the overload protecting circuit
Galvanic electricity machine, using voltage sampling circuit structure.
The technical scheme is that a kind of overload protecting circuit is provided, including voltage sampling circuit and trigger circuit,
The voltage sampling circuit includes first voltage sampling module and second voltage sampling module, for respectively to two electrical voltage points
Carry out voltage signal sampling；The first voltage sampling module and second voltage sampling module are also connect with the trigger circuit,
The voltage signal collected to be handled.
The first voltage sampling module is identical as the circuit structure of the second voltage sampling module.
The structure of voltage sample module are as follows: including first resistor, second resistance and first switch device, the switching device
Input terminal connect with one end of the first resistor, one end of the output end of the switching device and second resistance connects, institute
The other end of the other end, the second resistance of stating first resistor is divided into voltage signal sampling end.
The trigger circuit includes input module, isolation controller part and output module；The input module it is defeated
Enter end to connect with the voltage sample point of the voltage sample of first voltage sampling module point, second voltage sampling module, the input
The output end of module is connect with the input terminal of isolation controller part；The input terminal of the output module is defeated with isolation controller part
Outlet connection, the output end of the output module are overload signal output end.
The input module includes first capacitor, the input of one end of the first capacitor and the isolation controller part
Rectify pole connection, the other end of the first capacitor is connect with the input cathode of isolation controller part.
The input module further includes second switch device, and the input terminal of the second switch device is adopted with first voltage
The input anode connection of the voltage sample point, one end of first capacitor, isolation controller part of egf block；The second switch device
The input of the voltage sample point, the other end of first capacitor, isolation controller part of the output end and second voltage sampling module of part
Hold cathode connection.
The output module includes 3rd resistor and the 4th resistance, and one end of the 3rd resistor and power supply are just
Pole connection, the other end of the 3rd resistor are connect with the output head anode from control device；The one of 4th resistance
End is connect with the negative pole of output end of the isolation controller part, and the other end of the 4th resistance is connect with ground terminal；It is described every
Negative pole of output end from control device is load signal output end.
The output module further includes the second capacitor, the both ends of second capacitor respectively with the 4th resistance two
End connection.
A kind of alternating current generator, including motor body, positive and reverse rotation control circuit and overload protecting circuit, the motor sheet
Body is connect with the positive and reverse rotation control circuit；The overload protecting circuit is connect with the positive and reverse rotation control circuit；Described
Overload protecting circuit is the overload protecting circuit of the utility model.
The utility model overload protecting circuit uses voltage sampling circuit structure, has the advantage that
One, the utility model overload protecting circuit eliminates cement resistor, is carried out using low-power conventional electrical component
Substitution, it is not only low in energy consumption, but also due to using voltage sampling circuit structure, directly progress voltage sample, so as to avoid motor
The impact of high current.
Two, since the characteristic that other end voltage reduces after induction machine overload is its peculiar phenomenon, so voltage sample
Mode be applicable in all induction machines, and do not need readjust parameter so that its is applied widely.
Three, it is influenced by the characteristic of induction machine, when motor is by unexpected heavy load impact condition, is easy to produce and is rotating forward
In the case where, there is rapidly reversal development in motor.At this time since the sample rate of voltage is very fast, information carrying will not be omitted
Number, the erroneous judgement possibility for causing circuit is reduced, and then improve the reliability of alternating current generator.
Detailed description of the invention
Fig. 1 is the circuit diagram of prior art alternating current generator.
Fig. 2 is the circuit block diagram of the utility model overload protecting circuit.
Fig. 3 is the circuit diagram of the utility model overload protecting circuit.
Fig. 4 is the circuit block diagram of the utility model alternating current generator.
Fig. 5 is the circuit diagram of the utility model alternating current generator.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Fig. 2, the utility model overload protecting circuit, including voltage sampling circuit and trigger circuit, it is described
Voltage sampling circuit includes first voltage sampling module and second voltage sampling module, first voltage sampling module and second voltage
Sampling module forms a voltage sample electric bridge, for carrying out voltage signal sampling to two electrical voltage points respectively, i.e. AC_ in Fig. 3
Two sampled points of L1 and AC_L2；The first voltage sampling module and second voltage sampling module also connect with the trigger circuit
It connects, to handle the voltage signal collected.Wherein first voltage sampling module and second voltage sampling module
Structure can be identical or not identical, the structure of first voltage sampling module and second voltage sampling module in the utility model
It is identical.
The first voltage sampling module is identical as the circuit structure of the second voltage sampling module.
The structure of voltage sample module are as follows: including first resistor, second resistance and first switch device, the switching device
Input terminal connect with one end of the first resistor, one end of the output end of the switching device and second resistance connects, institute
The other end of the other end, the second resistance of stating first resistor is divided into voltage signal sampling end.In the present embodiment, the first electricity
Pressing sampling module includes first resistor R1, and second resistance R3 and first switch device D1, structure are as shown in Figure 3；First voltage
Sampling module includes first resistor R2, and second resistance R4 and first switch device D2, structure are as shown in Figure 3；First switch device
Part can be active switching device device, and such as IGBT is also possible to passive switch device, such as diode.
The trigger circuit includes input module, isolation controller part and output module；The input module it is defeated
Enter end to connect with the voltage sample point of the voltage sample of first voltage sampling module point, second voltage sampling module, the input
The output end of module is connect with the input terminal of isolation controller part；The input terminal of the output module is defeated with isolation controller part
Outlet connection, the output end of the output module are overload signal output end.Isolation controller part sampled light in the present embodiment
Electric coupler component is isolated.
The input module includes first capacitor, the input of one end of the first capacitor and the isolation controller part
Rectify pole connection, the other end of the first capacitor is connect with the input cathode of isolation controller part.
The input module further includes second switch device, and the input terminal of the second switch device is adopted with first voltage
The input anode connection of the voltage sample point, one end of first capacitor, isolation controller part of egf block；The second switch device
The input of the voltage sample point, the other end of first capacitor, isolation controller part of the output end and second voltage sampling module of part
Hold cathode connection.Input module includes second switch device D3 and first capacitor E1, wherein second switch device can be for actively
Switching device device, such as IGBT are also possible to passive switch device, such as diode.First capacitor E1 uses electrolytic capacitor.
The output module includes 3rd resistor and the 4th resistance, and one end of the 3rd resistor and power supply are just
Pole connection, the other end of the 3rd resistor are connect with the output head anode from control device；The one of 4th resistance
End is connect with the negative pole of output end of the isolation controller part, and the other end of the 4th resistance is connect with ground terminal；It is described every
Negative pole of output end from control device is load signal output end.Output module include 3rd resistor R5, the 4th resistance R6 and
Second capacitor E2, the second capacitor E2 is electrolytic capacitor；The specific structure is shown in FIG. 3.
The output module further includes the second capacitor, and filter capacitor of second capacitor as OVERLOAD signal prevents
High-frequency Interference.The both ends of second capacitor are connect with the both ends of the 4th resistance respectively.
As shown in figure 4, a kind of alternating current generator, including motor body, positive and reverse rotation control circuit and overload protecting circuit, institute
The motor body stated is connect with the positive and reverse rotation control circuit；The overload protecting circuit with the positive and reverse rotation control circuit
Connection, i.e., the input, output end of overload protecting circuit is connect with the positive and reverse rotation control circuit, acquires circuit for controlling motor
On voltage signal, handle the voltage signal and send feedback signal to circuit for controlling motor；The overload protecting circuit is
The overload protecting circuit of the utility model.Wherein, the utility model overload protecting circuit, including voltage sampling circuit and triggering
Circuit, the voltage sampling circuit include first voltage sampling module and second voltage sampling module, and first voltage samples mould
Block and second voltage sampling module form a voltage sample electric bridge, for carrying out voltage letter to rotating forward winding and reversion winding respectively
Number sampling；The first voltage sampling module and second voltage sampling module are also connect with the trigger circuit, will acquire
Obtained voltage signal is handled, and trigger circuit conveys signal back to positive and reverse rotation control circuit, to judge that alternating current generator is
It is no to stop working.
In Fig. 5, the connection of the end R1 rotates forward winding, the end R2 connection reversion winding, respectively to the rotating forward winding of alternating current generator and
Reversion winding is sampled.There are an electrical characteristics for alternating current generator, when positive and negative rotation winding one end is powered, if it is existing to encounter overload
As the voltage of the other end will significantly reduce.That is when rotating forward winding energization, when motor rotates forward, if it is existing motor overload occur
As inverting the voltage on winding will reduce.The voltage for comparing the end R1 and the end R2 is also corresponded to, electricity is generated when generating pressure drop
Stream, driving U1 work, generates overload signal.When motor, which rotates forward, overload phenomenon occurs, the reversion winding voltage drop of the end R2 connection
It is low, cause the luminous end of U1 forward voltage drop occur and shine, overload signal becomes high level from low level, also just produces
Overload signal.
In Fig. 5, the both ends of first voltage sampling module the one end of R3 (one end of R1) respectively with the firewire of alternating current circuit
It is connected with zero curve；The both ends one end of R4 (one end of R2) of second voltage sampling module respectively with the firewire of alternating current circuit and zero
Line connection.
The present invention is not limited only to above embodiments, and specific structure is allowed to vary.In every case in the utility model rights to independence
Made various change is within the scope of the invention in the protection scope that benefit requires.
Claims (9)
1. a kind of overload protecting circuit, including voltage sampling circuit and trigger circuit, it is characterised in that: the voltage sample
Circuit includes first voltage sampling module and second voltage sampling module, is adopted for carrying out voltage signal to two electrical voltage points respectively
Sample；The first voltage sampling module and second voltage sampling module are also connect with the trigger circuit, will collect
Voltage signal handled.
2. overload protecting circuit according to claim 1, it is characterised in that: the first voltage sampling module with it is described
The circuit structure of second voltage sampling module is identical.
3. overload protecting circuit according to claim 2, it is characterised in that: the structure of voltage sample module are as follows: including
One resistance, second resistance and first switch device, the input terminal of the switching device are connect with one end of the first resistor, institute
State switching device output end and second resistance one end connect, the other end of the first resistor, the second resistance it is another
One end is divided into voltage signal sampling end.
4. overload protecting circuit according to claim 1, it is characterised in that: the trigger circuit include input module,
Isolation controller part and output module；The voltage sample point of the input terminal of the input module and first voltage sampling module,
The voltage sample point of second voltage sampling module connects, and the output end of the input module and the input terminal of isolation controller part connect
It connects；The input terminal of the output module is connect with the output end of isolation controller part, and the output end of the output module is overload
Signal output end.
5. overload protecting circuit according to claim 4, it is characterised in that: the input module includes first capacitor,
One end of the first capacitor is connect with the input anode of the isolation controller part, the other end of the first capacitor with every
Input cathode connection from control device.
6. overload protecting circuit according to claim 5, it is characterised in that: the input module further includes second switch
The voltage sample point of device, the input terminal of the second switch device and first voltage sampling module, first capacitor one end, every
Input anode connection from control device；The voltage of the output end and second voltage sampling module of the second switch device is adopted
The input cathode connection of sampling point, the other end of first capacitor, isolation controller part.
7. overload protecting circuit according to claim 4, it is characterised in that: the output module include 3rd resistor with
And the 4th resistance, one end of the 3rd resistor are connect with power supply anode, the other end of the 3rd resistor and it is described from
The output head anode of control device connects；One end of 4th resistance and the negative pole of output end of the isolation controller part connect
It connects, the other end of the 4th resistance is connect with ground terminal；The negative pole of output end of the isolation controller part is that load signal is defeated
Outlet.
8. overload protecting circuit according to claim 7, it is characterised in that: the output module further includes the second electricity
Hold, the both ends of second capacitor are connect with the both ends of the 4th resistance respectively.
9. a kind of alternating current generator, including motor body, positive and reverse rotation control circuit and overload protecting circuit, the motor body
It is connect with the positive and reverse rotation control circuit；The overload protecting circuit is connect with the positive and reverse rotation control circuit；Its feature exists
In: the overload protecting circuit is overload protecting circuit described in any one in claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820710555.9U CN208690920U (en) | 2018-05-14 | 2018-05-14 | Alternating current generator and its overload protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820710555.9U CN208690920U (en) | 2018-05-14 | 2018-05-14 | Alternating current generator and its overload protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208690920U true CN208690920U (en) | 2019-04-02 |
Family
ID=65877170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820710555.9U Active CN208690920U (en) | 2018-05-14 | 2018-05-14 | Alternating current generator and its overload protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208690920U (en) |
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2018
- 2018-05-14 CN CN201820710555.9U patent/CN208690920U/en active Active
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