CN204376805U - Power control, motor driven systems and magnetic resonance equipment - Google Patents
Power control, motor driven systems and magnetic resonance equipment Download PDFInfo
- Publication number
- CN204376805U CN204376805U CN201520013704.2U CN201520013704U CN204376805U CN 204376805 U CN204376805 U CN 204376805U CN 201520013704 U CN201520013704 U CN 201520013704U CN 204376805 U CN204376805 U CN 204376805U
- Authority
- CN
- China
- Prior art keywords
- switch
- driven systems
- motor driven
- motor
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Stopping Of Electric Motors (AREA)
Abstract
The utility model relates to a kind of power control, motor driven systems and magnetic resonance equipment.Described power control is used for the electric equipment under magnetic field environment, wherein, comprising: a power supply, and it is for supplying electric power to load; Semiconductor switch element, it is arranged at electric equipment or near electric equipment, carries out switch control rule to power supply to the electric power supply of load; One current measuring element, itself and thyristor are connected in series between power supply and load; One switch protector, it is electrically connected with current measuring element, detects the electric current flowing through current measuring element, and exports the first switching instruction signals according to the electric current detected; One switch driver, it accepts the first switching instruction signals exported by switch protector, and drives thyristor to carry out switch motion according to this first switching instruction signals.
Description
Technical field
The utility model relates to a kind of power control, motor driven systems and magnetic resonance equipment.
Background technology
In the sick bed design of current MR imaging apparatus, usually use motor to drive the motion of sick bed, motor is generally controlled its speed and direction by motor drive controller.Generally, driver can control operation and the stopping of motor according to the requirement of default.But after motor driver breaks down, some accidental movement may be caused thus cause device damage or personnel's injury.In order to avoid this unexpected generation, usually adopt when fault a circuit to cut off the power supply of driver, thus ensure that the kinematic system of sick bed is safer.
Usually, contactor (or relay) can be adopted to realize cutting off drive power supply, but consider magnetic field environment special in MR imaging apparatus, adverse effect can be brought to the reliability of contactor and life-span.In addition, contactor is contact switch, can produce electric spark, likely having an impact to magnetic resonance image (MRI) when opening and cut off, thus impact diagnosis.
As shown in Figure 2, in the sick bed design of existing MR imaging apparatus, power supply 1, after the main contacts of contactor 3, is powered to motor driver 2, and then motor driver 2 controls motor M operation.The coil 4 of contactor 3 is controlled by the control signal of testing circuit 5.When system does not have fault, control signal is connected, and the coil 4 of contactor obtains electric and produces electromagnetic force, and contactor 3 is closed, so motor driver 2 obtains electric power supply from power supply 1, drive motors M drives bed motion.When system has fault, control signal turns off, coil 4 dead electricity of contactor, and electromagnetic force disappears, and contactor 3 is opened, so motor driver 2 dead electricity, motor M stops driving sick bed.
In this power control, 3, contactor, as magnetic element, produces electromagnetic force by coil 4 energising and contactor 3 is closed, thus power to motor driver 2.In magnetic resonance system, because magnetic resonance system itself has larger stationary magnetic field.If the installation site of contactor 3 is close to main field, then this magnetic field can have a negative impact to the reliability of operation of contactor and life-span, such as reduce the cut-off velocity of contactor 3, thus cause the main contacts of contactor 3 to produce spark or arcing, and then burn out main contacts.
In addition, the spark produced when making coil 4 be energized or cut off can cause interference to the high-frequency circuit of magnetic resonance system.In addition, the electromagnetic field produced after coil 4 conducting can affect the main field of magnetic resonance system and the uniformity of gradient magnetic, has a negative impact, affect diagnosis sometimes to the image of systematic survey.
Utility model content
In view of this, the utility model proposes and a kind ofly do not use magnetic switch element and use the power control of thyristor, motor driven systems and magnetic resonance device.
An embodiment of the present utility model provides a kind of power control, and it, for the electric equipment under magnetic field environment, wherein, comprising: power supply, and it is for supplying electric power to load; Thyristor, it is arranged at described electric equipment or near described electric equipment, carries out switch control rule to described power supply to the electric power supply of described load; Current measuring element, itself and described thyristor are connected in series between described power supply and described load; Switch protector, it is electrically connected with described current measuring element, detects the electric current flowing through described current measuring element, and exports the first switching instruction signals according to the described electric current detected; Switch driver, it accepts described first switching instruction signals exported by described switch protector, and drives described thyristor to carry out switch motion according to this first switching instruction signals.
According to the present embodiment, in power equipment under strong magnetic field circumstance, especially MR imaging apparatus, adopt contactless thyristor to achieve conducting and the cut-out of drive power supply, avoid utilize the contactor of electromagnetic force may produce when switch spark even affect image quality situation occur.Series current detecting element between power supply and load in addition; and utilize switch protector to detect the voltage of electric current and the power supply flow through in current measuring element; when electric current is excessive or overvoltage appears in power supply, under-voltage time; make switch driver cut off thyristor, thus prevent the damage of thyristor.
In addition, in above-mentioned power control, preferred described current measuring element is resistance, and determines according to the voltage at these resistance two ends the current value flowing through this resistance.
In addition, in above-mentioned power control, preferred semiconductor switch element is the one in MOSFET, IGBT or thyristor.
An embodiment of the present utility model provides a kind of motor driven systems, comprising: motor; Described power control, wherein said load is motor driver, and described load is connected with described motor.
According to the motor driven systems of the present embodiment, in power equipment under strong magnetic field circumstance, especially MR imaging apparatus, adopt contactless thyristor to achieve conducting and the cut-out of drive power supply, avoid utilize the contactor of electromagnetic force may produce when switch spark even affect image quality situation occur.Series current detecting element between power supply and load in addition; and utilize switch protector to detect the voltage of electric current and the power supply flow through in current measuring element; when electric current is excessive or overvoltage appears in power supply, under-voltage time; make switch driver cut off thyristor, thus prevent the damage of thyristor.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises the failure detector circuit detected the fault of described driven object thing, described failure detector circuit is electrically connected with the described switch driver in described power control, and exporting second switch command signal to described switch driver, described switch driver performs the switch motion of described thyristor according to this second switch command signal.
In addition, in above-mentioned motor driven systems, preferred described failure detector circuit is electrically connected with the brake of described motor, and the state of the described driven object thing detected according to described failure detector circuit, the first brake command signal of actuating motor braking or brake off is sent to electromotor brake.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises microprocessing unit, described microprocessing unit is electrically connected with described switch driver, and according to the input instruction of user, send the 3rd switching instruction signals making described semiconductor element perform switch motion to described switch driver.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises microprocessing unit, described microprocessing unit is electrically connected with the brake of described motor, and according to the input instruction of user, send the second brake command signal of actuating motor braking or brake off to described electromotor brake.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises the first logical circuit, described first logical circuit is arranged on described failure detector circuit and between described microprocessing unit and described switch driver, and carries out logical operation to described second switch command signal and described 3rd switching instruction signals.
Such as, when microprocessing unit receive and to the first logical circuit send make thyristor conducting instruction that is the 3rd switching instruction signals instruction conducting time, when only having failure detector circuit not detect that fault and second switch command signal do not indicate thyristor to disconnect, the just meeting conducting of first logical circuit, and the signal driving thyristor conducting is sent to semiconductor switch driver.Thus, prevent the misoperation of system user, add the fail safe of system.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises the second logical circuit, described second logical circuit is arranged on described microprocessing unit and between described failure detector circuit and described electromotor brake, and carries out logical operation to described first brake command signal and described second brake command signal.
Such as, when microprocessing unit from input/output unit receive and when sending to the second logical circuit the input control signal and second brake command signal that make electromotor brake brake off, only when failure detector circuit does not detect the situation of fault that is the first brake command signal does not indicate brake to brake, the just meeting conducting of second logical circuit, and make motor braking driver drives electromotor brake brake off.Thus, prevent the misoperation of system user, add the fail safe of system.
In addition, in above-mentioned motor driven systems, preferred described motor driven systems also comprises a buffer circuit, and described buffer circuit is arranged between described first logical circuit and described switch driver.
An embodiment of the present utility model provides a kind of magnetic resonance equipment, wherein, comprising: described motor driven systems.
Accompanying drawing explanation
Preferred embodiment of the present utility model will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present utility model, in accompanying drawing:
The structure key diagram of the power control (motor driven systems) of Fig. 1 involved by embodiment of the present utility model.
Fig. 2 is the key diagram of regarding power source control device in prior art.
Wherein, Reference numeral is as follows:
10 power supplys;
20 thyristors;
30 motor drivers;
40 current sense resistors;
50 switch protectors;
60 semiconductor switch drivers;
100 micro-control units;
110 input/output units;
120 failure detector circuits;
130 motor braking drivers;
140 buffer circuits;
210 first logical circuits;
220 second logical circuits;
Motor M;
Electromotor brake B.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, by the following examples the utility model is further described.
In this article, " schematically " expression " serves as example, example or explanation ", not should by being described to any diagram of " schematically " in this article, execution mode is interpreted as a kind of preferred or have more the technical scheme of advantage.
For making simplified form, only schematically show the part relevant to the utility model in each figure, they do not represent its practical structures as product.In addition, being convenient to for making simplified form understand, there are the parts of same structure or function in some figure, only schematically depict one of them, or only having marked one of them.
Fig. 1 schematically shows power control involved by embodiment of the present utility model and motor driven systems.
The power control of the present embodiment is arranged at the power equipment under magnetic field environment, such as MR imaging apparatus.As shown in Figure 1, the power control that the present embodiment relates to comprises: power supply 10, thyristor 20, motor driver 30 and and thyristor 20 be connected in series in current sense resistor 40 between power supply 10 and motor driver 30.Wherein, power supply 10 is for supplying electric power to motor driver 30.Thyristor 20 is arranged at MR imaging apparatus, the sick bed of such as MR imaging apparatus, carries out switch control rule to power supply 10 to the electric power supply of motor driver 30.At this, thyristor 20 can adopt the semiconductor switch device such as MOSFET, IGBT or thyristor, is described in the present embodiment for MOSFET.Motor driver 30, as the load in power control, drives motor M, and motor M is such as connected with the sick bed of MR imaging apparatus further, controls the motion of sick bed.
In addition, in the present embodiment, power control also comprises the switch protector 50 protected thyristor 20 and the semiconductor switch driver 60 thyristor 20 being carried out to drived control.
As shown in Figure 1, switch protector 50 current sense resistor 40 with predetermined resistance is connected in parallel, measures the voltage at current sense resistor 40 two ends, and then calculate to obtain according to measuring the voltage obtained the current value that flows through in current sense resistor 40.In addition, in the power control that the present embodiment relates to, one end ground connection of power supply 10, the other end is connected with switch protector 50, thus switch protector 50 also can measure the voltage of power supply 10.
In the present embodiment; when motor driver 30 breaks down; such as utilize the motor rotation blockage etc. that it drives; the electric current of current sense resistor 40 can increase; when this current value increases to the predetermined threshold value of switch protector 50; switch protector 50 exports the first switching instruction signals SS1 to semiconductor switch driver 60, directly closes the drive circuit of semiconductor switch driver 60, thus turns off thyristor 20.The response of semiconductor switch driver 60 to this first switching instruction signals SS1 is quickly, is generally several milliseconds, so can protect thyristor 20 well.Simultaneously; as mentioned above; switch protector 50 also can measure the voltage of power supply 10; if when the voltage of power supply 10 exceedes preset value; i.e. overvoltage, under-voltage time; switch protector 50 also exports the first switching instruction signals SS1 to semiconductor switch driver 60, turns off thyristor 20, protection load circuit below.In addition, when switch protector 50 once monitor overcurrent, overvoltage, under-voltage after, micro-control unit 100 described later can be notified, and then be presented on input/output unit 110.
In addition, in the present embodiment also exemplified with motor driven systems, except comprising power control, also there is motor M, micro-control unit (MCU) 100, failure detector circuit 120, motor braking driver 130, electromotor brake B, buffer circuit 140 and the driven object thing 150 by motor M drived control.Wherein, motor M is connected to motor driver 30, and moves according to the speed/positional command signal from motor driver 30.
The fault of the 120 pairs of driven object things 150 in fault detect loop detects, such as to movement velocity, touch limit switch, set out shutdown switch, motor position etc. detect.Fault detect loop 120 is connected respectively to the first logical circuit 210 and the second logical circuit 220.First logical circuit 210 is connected with semiconductor switch driver 60, for the switch control rule of thyristor 20.Second logical circuit 220 is connected with motor braking driver 130, for carrying out control for brake to electromotor brake B.
After fault detect loop 120 detects fault, fault detect loop 120 sends the second switch command signal SS2 that thyristor 20 is cut off to semiconductor switch driver 60 by the first logical circuit 210, semiconductor switch driver 60 is according to this second switch command signal SS2, thyristor 20 is disconnected, thus stops power supply 20 to supply to the electric power of motor driver 30.
In addition, after fault detect loop 120 detects fault, fault detect loop 120 sends the first brake command signal BS1 that motor M is braked to motor braking driver 130 by the second logical circuit 220, motor braking driver 130 is according to this first brake command signal BS1, electromotor brake B is utilized to make motor M out of service, thus ensureing when breaking down, motor M can stop quickly, thus reduces the risk after fault occurs.
In addition, be also provided with a microprocessing unit 100 in the motor driven systems of the present embodiment, microprocessing unit 100 can accept fault-signal from switch protector 50, and by input/output unit 110 to User Alarms.In addition, microprocessing unit 100 also can accept fault-signal from fault detect loop 120, and by input/output unit 110 to User Alarms.
In addition, microprocessing unit 100 can receive from input/output unit 110 input control order making thyristor 20 conducting.When receiving when microprocessing unit 100 and send the instruction of the 3rd switching instruction signals SS3 and thyristor 20 conducting to the first logical circuit 210, when only having failure detector circuit 120 not detect that fault and second switch command signal SS2 do not indicate thyristor 20 to disconnect, the just meeting conducting of first logical circuit 210, and the signal driving thyristor 20 conducting is sent to semiconductor switch driver 60.Equally, when microprocessing unit 100 to receive from input/output unit 110 and sends the input control signal of second brake command signal BS2 and electromotor brake B brake off to the second logical circuit 220, only when failure detector circuit 120 does not detect the situation of fault that is the first brake command signal BS1 does not indicate brake to brake, the just meeting conducting of second logical circuit 220, and make motor braking driver 130 drive motors brake B brake off.
That is, the first logical circuit 210 carries out logical operation to the second switch command signal SS2 from failure detector circuit 120 and the 3rd switching instruction signals SS3 from microprocessing unit 100.Second logical circuit 220 carries out logical operation to the first brake command signal BS1 from failure detector circuit 120 and the second brake command signal BS2 from microprocessing unit 100.
In addition; microprocessing unit 100 the fault receiving fault detect loop 120 export or the fault-signal of switch protector 50 time; also can send to semiconductor switch driver 60 instruction that thyristor 20 is disconnected; or send the instruction that electromotor brake B is braked to motor braking driver 130, thus the system of guarantee is safer.
In addition; in the motor driven systems of the present embodiment; at microprocessing unit 100 and be also provided with a buffer circuit 140 between the first logical circuit 210 and semiconductor switch driver 60, utilize this buffer circuit 140 protect microprocessing unit 100 and the first logical circuit 210 interference-free.
In the above-described embodiments exemplified with the input/output unit 110 using microprocessing unit 100 and system, but the input/output unit 110 of above-mentioned microprocessing unit 100 and system also can not be set.
In addition, in the above-described embodiments exemplified with use buffer circuit 140, but also buffer circuit 140 can not be set.
In addition, exemplified with use current sense resistor 40 in the power control of above-described embodiment, but also can be other electric components such as Hall element.
Be provided with the first logical circuit 210 and the second logical circuit 220 in the above-described embodiments, but also above-mentioned logical circuit can not be set.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (12)
1. a power control, it, for the electric equipment of under magnetic field environment, wherein, comprising:
One power supply, it is for supplying electric power at least one load;
Semiconductor switch element, it is arranged at described electric equipment or near described electric equipment, carries out switch control rule to described power supply (10) to the electric power supply of described load;
One current measuring element, itself and described thyristor are connected in series between described power supply and described load;
One switch protector, it is electrically connected with described current measuring element, detects the electric current flowing through described current measuring element, and exports the first switching instruction signals according to the described electric current detected;
One switch driver, it accepts described first switching instruction signals exported by described switch protector, and drives described thyristor to carry out switch motion according to this first switching instruction signals.
2. power control according to claim 1, wherein,
Described current measuring element is resistance, and described switch protector determines according to the voltage at these resistance two ends the current value flowing through this resistance.
3. power control according to claim 1, wherein,
Described thyristor is the one in MOSFET, IGBT or thyristor.
4. a motor driven systems, wherein, comprising:
At least one motor, it can carry out drived control to driven object thing, and with brake;
Power control according to any one of claims 1 to 3,
Described load is motor driver, and described load is connected with described motor.
5. motor driven systems according to claim 4, wherein,
Described motor driven systems also comprises the failure detector circuit detected the fault of described driven object thing, described failure detector circuit is electrically connected with the described switch driver in described power control, and the state of the described motor detected according to described failure detector circuit, export a second switch command signal to described switch driver, described switch driver performs the switch motion of described thyristor according to this second switch command signal.
6. motor driven systems according to claim 5, wherein,
Described failure detector circuit is electrically connected with the brake of described motor, and the state of the described driven object thing detected according to described failure detector circuit, the first brake command signal of actuating motor braking or brake off is sent to described brake.
7. motor driven systems according to claim 5, wherein,
Described motor driven systems also comprises a microprocessing unit, described microprocessing unit is electrically connected with described switch driver, and according to the input instruction of user, send the 3rd switching instruction signals making described semiconductor element perform switch motion to described switch driver.
8. motor driven systems according to claim 6, wherein,
Described motor driven systems also comprises a microprocessing unit, and described microprocessing unit is electrically connected with described brake, and according to the input instruction of user, sends the second brake command signal of actuating motor braking or brake off to described brake.
9. motor driven systems according to claim 7, wherein,
Described motor driven systems also comprises one first logical circuit, described first logical circuit is arranged on described microprocessing unit and between described failure detector circuit and described switch driver, and carries out logical operation to described second switch command signal and described 3rd switching instruction signals.
10. motor driven systems according to claim 8, wherein,
Described motor driven systems also comprises one second logical circuit, described second logical circuit is arranged on described microprocessing unit and between described failure detector circuit and described brake, and carries out logical operation to described first brake command signal and described second brake command signal.
11. motor driven systems according to claim 9, wherein,
Described motor driven systems also comprises a buffer circuit, and described buffer circuit is arranged between described first logical circuit and described switch driver.
12. 1 kinds of magnetic resonance equipments, wherein, comprising:
Motor driven systems according to any one of claim 4 ~ 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520013704.2U CN204376805U (en) | 2015-01-09 | 2015-01-09 | Power control, motor driven systems and magnetic resonance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520013704.2U CN204376805U (en) | 2015-01-09 | 2015-01-09 | Power control, motor driven systems and magnetic resonance equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204376805U true CN204376805U (en) | 2015-06-03 |
Family
ID=53332982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520013704.2U Active CN204376805U (en) | 2015-01-09 | 2015-01-09 | Power control, motor driven systems and magnetic resonance equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204376805U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330057A (en) * | 2016-10-31 | 2017-01-11 | 上海螺趣科技有限公司 | Motor device, robot and method for controlling operation of motor device |
| CN112975936A (en) * | 2019-12-13 | 2021-06-18 | 精工爱普生株式会社 | Motor drive system and robot |
-
2015
- 2015-01-09 CN CN201520013704.2U patent/CN204376805U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330057A (en) * | 2016-10-31 | 2017-01-11 | 上海螺趣科技有限公司 | Motor device, robot and method for controlling operation of motor device |
| CN106330057B (en) * | 2016-10-31 | 2019-04-26 | 上海螺趣科技有限公司 | A kind of method of electric machine, robot and control electric machine operation |
| CN112975936A (en) * | 2019-12-13 | 2021-06-18 | 精工爱普生株式会社 | Motor drive system and robot |
| CN112975936B (en) * | 2019-12-13 | 2023-06-30 | 精工爱普生株式会社 | Motor driving system and robot |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3492309B1 (en) | Automatic passing phase-separation system for section post of electrified railway, and control method therefor | |
| CN105934810B (en) | AC circuit breaker with self-testing capability | |
| US10569895B2 (en) | Systems, methods, and devices for bipolar high voltage direct current ground fault detection | |
| US9620319B2 (en) | Coil actuator for a switching device and related switching device | |
| CN105896469B (en) | A kind of circuit protection device of automatic monitoring operation troubles | |
| CN105262063B (en) | IGBT valve protection system and method in a kind of high voltage DC breaker | |
| CN107305356B (en) | A kind of control switch application circuit and its fault detection guard method | |
| CN204376805U (en) | Power control, motor driven systems and magnetic resonance equipment | |
| CN105762766B (en) | Synchronous motor seals star control system and method | |
| CN107901791A (en) | A kind of multiple feed return circuit detection method, system and device | |
| CN101870263A (en) | Method and system for automatic protection of electric vehicle by adopting permanent magnetic driving motor | |
| CN203820214U (en) | Brake control system of elevator | |
| CN102751695B (en) | AC contactor main contact adhesion alarm protecting apparatus and method | |
| CN105070601B (en) | Breaker contact point wear monitoring method and a kind of breaker based on magnetic induction | |
| CN107171277A (en) | A kind of zero loss depth current-limiting protection device that technology is cut-off based on Mintrop wave | |
| JP7365816B2 (en) | DC overvoltage monitoring and protection devices and DC electrical system interconnections | |
| KR20160037621A (en) | Electrical leakage current circuit breaker | |
| KR100880443B1 (en) | Solenoid coil supervision circuit for circuit breaker | |
| CN105897082A (en) | Chassis/earthing switch control circuit of medium-voltage switch cabinet | |
| CN102761098A (en) | Device and method for residual current protection | |
| KR101080265B1 (en) | Rail potential control system capable of distinguishing between ground fault and non-ground fault when rising from the rail potential | |
| CN102969694A (en) | Terminal operator protection circuit of direct-current power supply system | |
| CN109591655A (en) | Emergent stopping charging unit, charging pile and working method | |
| CN103076102A (en) | Main loop overheat automatic protection and fault diagnosis device for switch cabinet | |
| CN103076518B (en) | Straight-bar machines electromagnet state detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |