CN207734472U - Magnetic field control circuit - Google Patents
Magnetic field control circuit Download PDFInfo
- Publication number
- CN207734472U CN207734472U CN201621449403.5U CN201621449403U CN207734472U CN 207734472 U CN207734472 U CN 207734472U CN 201621449403 U CN201621449403 U CN 201621449403U CN 207734472 U CN207734472 U CN 207734472U
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- coil
- coupled
- magnetic field
- undercurrent
- control circuit
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Abstract
The utility model discloses a kind of magnetic field control circuits, including several coil drivers for being coupled to different coils being arranged in parallel, be coupled to coil driver flows through the too small undercurrent indicating circuit of coil current for showing, and it is coupled to the regulated power supply module for adjusting size of current in input coil of coil driver, coil driver includes the switch module for control coil work for being coupled to coil, and it is coupled to the undercurrent driving circuit for driving undercurrent indicating circuit of switch module, multiple coils are separately controlled, when the coil damage of one of them, remaining can also continue to use, the undercurrent indicating circuit work of undercurrent driving circuit driving simultaneously, improve security reliability；The changeable parameters of each coil driver so that the magnetic field size that each coil generates is variable, improves the versatility of coil；The size that the magnetic field that coil generates can be changed in the potentiometer in regulated power supply module is adjusted, to improve the versatility of coil.
Description
Technical field
The utility model is related to magnetic field generation technique fields, more specifically, it relates to a kind of magnetic field control circuit.
Background technology
Microwave diathermy machine is using microwave to novel intelligent made of the biological effect of human body and superpower penetration capacity
Therapeutic equipments.Be provided with microwave generator in the equipment, the microwave generator include for generate the coil device in magnetic field, with
The resonant cavity of coil device connection and the antenna for transmitting electric signal, the magnetic field that coil device generates are even more important.It is existing
In technology, coil device is connected in series by the coil on the outside of iron core, so, when coil damages, entire microwave
Generator is replaced, waste of resource, while also reducing the reliability that coil generates magnetic field.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of magnetic field control circuit, it can
Improve the reliability that coil generates magnetic field.
To achieve the above object, the utility model provides following technical solution：
A kind of magnetic field control circuit, including be arranged in parallel it is several be coupled to different coils for generating the coils in magnetic field
Driving circuit, be coupled to the coil driver for show flow through the too small undercurrent indicating circuit of coil current and
It is coupled to the regulated power supply module for adjusting size of current in input coil of the coil driver, the coil drive
Circuit include be coupled to coil for control coil work switch module and be coupled to the switch module for driving
Move the undercurrent driving circuit of the undercurrent indicating circuit.
By using above-mentioned technical proposal, regulated power supply module provides power supply for coil driver, and by adjusting electricity
The output voltage of source module achievees the purpose that adjust magnetic field size；Also, several coils from parallel connection of coils settings, and by same regulated power supply
Module for power supply only needs to change broken parts, has saved resource, improve safe and reliable when the coil damage for having one of them
Property；In addition, the electric current by coil is unsuitable too small, the magnetic field that coil generates otherwise can be caused too small and equipment needs are not achieved
It is required that so be provided with undercurrent indicating circuit, finger can be sent out by the way that coil current is too small or coil damages
Show signal, to remind staff to adjust electric power output voltage in time.
Further, the switch module includes being coupled to the switch element of the coil and being controlled by the switch
Element and the limiting voltage element for reacting on the switch element.
By using above-mentioned technical proposal, switch element can control the work of limiting voltage element, meanwhile, limiting voltage member
Part can react on switch element again, complement each other between the two, enable coil normal power-up.
Further, the switch element includes that collector is coupled to the coil, emitter is grounded, base stage is coupled to institute
State the Darlington transistor of limiting voltage element.
By using above-mentioned technical proposal, Darlington transistor is made of two triodes, can improve control coil break-make
Reliability.
Further, the limiting voltage element includes that inverting input is coupled to the Darlington transistor emitter, same to phase
Input terminal is coupled to the first reference voltage, output end is coupled to the first operational amplifier of the Darlington transistor base stage.
By using above-mentioned technical proposal, the signal to come is acquired when the first reference voltage is less than from Darlington transistor emitter
When, the output end of the first operational amplifier exports high level signal；Conversely, output low level signal.
Further, the undercurrent driving circuit includes that inverting input is coupled to the Darlington transistor emitter, same to phase
Input terminal is coupled to the second reference voltage, output end is coupled to the second operational amplifier of the undercurrent indicating circuit；Wherein,
Two reference voltages are less than the first reference voltage.
By using above-mentioned technical proposal, the signal to come is acquired when the first reference voltage is less than from Darlington transistor emitter
When, the output end of second operational amplifier exports high level signal；Conversely, output low level signal；Due to the first reference voltage
More than the second reference voltage, so when the signal to come from the acquisition of Darlington transistor emitter is located at the first reference voltage and the second base
When between quasi- voltage, coil can work normally；When higher than the second reference voltage, the regular break-make of Darlington transistor, coil
It cannot carry out steady operation；Too small by the electric current of coil when less than the first reference voltage, equipment is not achieved in the magnetic field of generation
Requirement.
Further, the undercurrent indicating circuit includes that base stage is coupled to the second operational amplifier output end, transmitting
Pole ground connection, collector is coupled to the triode of regulated power supply module and anode is coupled to the transistor collector, cathode connects
First light emitting diode on ground.
By using above-mentioned technical proposal, when the voltage of the offer of regulated power supply module output is too small, cause in coil
When electric current is too small, second operational amplifier export high level signal, can turn-on transistor make lumination of light emitting diode.
Further, the regulated power supply module includes the potentiometer for adjusting output voltage.
By using above-mentioned technical proposal, output voltage can be changed by rotating potentiometer.
Compared with prior art, the utility model has the advantages that：
1, multiple coils are separately controlled, and when the coil damage of one of them, remaining can also continue to use, and owe simultaneously
Driving circuit driving undercurrent indicating circuit work is flowed, security reliability is improved；
2, the changeable parameters of each coil driver so that the magnetic field size that each coil generates is variable, improves line
The versatility of circle；
3, the size that the magnetic field that coil generates can be changed in the potentiometer in regulated power supply module is adjusted, to improve coil
Versatility.
Description of the drawings
Fig. 1 is the circuit diagram of the coil drive of the utility model；
Fig. 2 is the circuit diagram of undercurrent indicating circuit；
Fig. 3 is the circuit diagram of regulated power supply module.
Reference numeral：1, coil driver；2, undercurrent indicating circuit；3, switch module；4, undercurrent driving circuit；5, it opens
Close element；6, limiting voltage element.
Specific implementation mode
With reference to the accompanying drawings and examples, the utility model is described in detail.
A kind of magnetic field control circuit, referring to Fig.1, including 3 coils, each coil are driven by coil driver 1, and
And each coil driver 1 is driven by the voltage that same regulated power supply module generates, by adjusting regulated power supply voltage
Value is defeated to adjust come the parameter size for adjusting element in the size of current of input coil, or each coil driver 1 of adjusting
The size of current for entering coil, to achieve the purpose that control magnetic field.Also, in order to enable model of the magnetic field of coil generation in setting
In enclosing, the electric current for being passed through coil can not be too small, has then coupled undercurrent indicating circuit 2 with coil driver 1.
By taking first coil driver 1 as an example, coil driver 1 include be coupled to coil be used for control coil work
The switch module 3 of work and the undercurrent driving circuit 4 for driving undercurrent indicating circuit 2 for being coupled to switch module 3, switch
Component 3 is again including being coupled to the switch element 5 of coil and being controlled by switch element 5 and react on the voltage of switch element 5
Limit element 6.In the present embodiment, switch element 5 is coupled to coil including collector, emitter passes through resistance R113 ground connection, base
Pole is coupled to the Darlington transistor VT111 of limiting voltage element 6, and limiting voltage element 6 passes through resistance R116 including inverting input
It is coupled to the tie point of Darlington transistor VT111 emitters and resistance R113, in-phase input end is coupled to first by resistance R111
Reference voltage, output end are coupled to the first operational amplifier N111A of Darlington transistor VT111 base stages by resistance R112.
It is connected moment when regulated power supply module exports, the inverting input of the first operational amplifier N111A receives low level
Signal, the input signal of in-phase input end is more than the input signal of inverting input, so the first operational amplifier N111A's is defeated
Outlet exports the electric signal of high level, at this point, the base stage of Darlington transistor VT111 receives the signal of high level, and its collector
It is same to receive high level signal, emitter ground connection, Darlington transistor VT111 conductings；At this point, the first operational amplifier N111A reverse phases
The input signal of input terminal and the input voltage positive correlation of regulated power supply module, if the voltage mistake of regulated power supply module output
Greatly, the inverting input received signal of the first operational amplifier N111A is caused to be more than the signal of in-phase input end, then the first fortune
The output end for calculating amplifier N111A exports low level signal, causes Darlington transistor VT111 to end, recycles to obtain with this unstable
Magnetic field；If the voltage of power module output is in the range of setting, the anti-phase input termination of the first operational amplifier N111A
The signal of receipts is less than the signal of in-phase input end, then the output end of the first operational amplifier N111A exports high level signal, causes
Darlington transistor VT111 conductings, to obtain stable magnetic field.But when the voltage of regulated power supply module output is too small, although
Still generate magnetic field, but can cause flowing through coil power on flow through it is small so that coil generate magnetic field do not reach requirement, in
It is to be provided with undercurrent indicating circuit 2, alarm and reminding staff's needs is sent out when the voltage of regulated power supply module output is too small
The output voltage of appropriate adjustment regulated power supply module.
In addition, it includes inverting input that undercurrent indicating circuit 2, which needs the driving of undercurrent driving circuit 4, undercurrent driving circuit 4,
It is coupled to Darlington transistor VT111 emitters by resistance R111, in-phase input end is coupled to the second reference voltage, output end coupling
In the second operational amplifier N111B of undercurrent indicating circuit 2；Wherein, the second reference voltage is less than the first reference voltage.
When the first reference voltage, which is less than, acquires the signal to come from Darlington transistor VT111 emitters, the second operation amplifier
The output end of device N111B exports high level signal；Conversely, output low level signal；Since the first reference voltage is more than the second base
Quasi- voltage, so when the signal to come from the acquisition of Darlington transistor VT111 emitters is located at the first reference voltage and the second benchmark electricity
When between pressure, coil can work normally；When higher than the second reference voltage, the regular break-makes of Darlington transistor VT111, coil
It cannot carry out steady operation；Too small by the electric current of coil when less than the first reference voltage, equipment is not achieved in the magnetic field of generation
Requirement.
It is worth noting that, when wherein not up to standard there are one the electric current of coil, 2 work of undercurrent indicating circuit can be driven
Make.
With reference to Fig. 2, undercurrent indicating circuit 2 is coupled to second operational amplifier N111B output ends including base stage, emitter connects
Ground, collector are coupled to the triode VT141 of regulated power supply module and anode is coupled to triode VT141 collectors, cathode
Ground connection the first light emitting diode, when regulated power supply module output offer voltage it is too small, cause the electric current in coil too small
When, second operational amplifier N111B exports high level signal, can turn-on transistor VT141 make lumination of light emitting diode.
In addition, staff adjusts the output voltage of regulated power supply module for convenience, with reference to Fig. 3, regulated power supply module
Include the potentiometer RL for adjusting output voltage, when needing to adjust output voltage, rotation potentiometer RL changes its partial pressure value.
The above is only the preferred embodiment of the utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (7)
1. a kind of magnetic field control circuit, which is characterized in that including be arranged in parallel it is several be coupled to different coils for generating
The coil driver (1) in magnetic field, be coupled to the coil driver (1) flow through too small deficient of coil current for show
Stream indicating circuit (2) and be coupled to the coil driver (1) for adjusting the adjustable of size of current in input coil
Power module, the coil driver (1) include be coupled to coil for control coil work switch module (3), with
And it is coupled to the undercurrent driving circuit (4) for driving the undercurrent indicating circuit (2) of the switch module (3).
2. magnetic field control circuit according to claim 1, which is characterized in that the switch module (3) includes being coupled to institute
It states the switch element (5) of coil and is controlled by the switch element (5) and reacts on the voltage of the switch element (5)
Limit element (6).
3. magnetic field control circuit according to claim 2, which is characterized in that the switch element (5) includes collector coupling
It is connected to the coil, emitter ground connection, base stage are coupled to the Darlington transistor of the limiting voltage element (6).
4. magnetic field control circuit according to claim 3, which is characterized in that the limiting voltage element (6) includes reverse phase
Described in input terminal is coupled to the Darlington transistor emitter, in-phase input end is coupled to the first reference voltage, output end is coupled to
First operational amplifier of Darlington transistor base stage.
5. magnetic field control circuit according to claim 4, which is characterized in that the undercurrent driving circuit (4) includes reverse phase
Described in input terminal is coupled to the Darlington transistor emitter, in-phase input end is coupled to the second reference voltage, output end is coupled to
The second operational amplifier of undercurrent indicating circuit (2)；
Wherein, the second reference voltage is less than the first reference voltage.
6. magnetic field control circuit according to claim 5, which is characterized in that the undercurrent indicating circuit (2) includes base stage
Be coupled to the second operational amplifier output end, emitter ground connection, collector are coupled to the triode of regulated power supply module, with
And the first light emitting diode that anode is coupled to the transistor collector, cathode is grounded.
7. magnetic field control circuit according to claim 6, which is characterized in that the regulated power supply module includes for adjusting
The potentiometer of output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621449403.5U CN207734472U (en) | 2016-12-27 | 2016-12-27 | Magnetic field control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621449403.5U CN207734472U (en) | 2016-12-27 | 2016-12-27 | Magnetic field control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207734472U true CN207734472U (en) | 2018-08-17 |
Family
ID=63113686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621449403.5U Active CN207734472U (en) | 2016-12-27 | 2016-12-27 | Magnetic field control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207734472U (en) |
-
2016
- 2016-12-27 CN CN201621449403.5U patent/CN207734472U/en active Active
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