CN217181428U - Electromagnet coil current control device, mechanical switch assembly and double-power-supply controller - Google Patents
Electromagnet coil current control device, mechanical switch assembly and double-power-supply controller Download PDFInfo
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- CN217181428U CN217181428U CN202220826607.5U CN202220826607U CN217181428U CN 217181428 U CN217181428 U CN 217181428U CN 202220826607 U CN202220826607 U CN 202220826607U CN 217181428 U CN217181428 U CN 217181428U
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Abstract
There is provided a current control device for controlling a current of an electromagnet, characterized by comprising: the power semiconductor switch is connected with the electromagnet in series; the controller is connected with external equipment and used for receiving the electromagnet current parameter from the external equipment to generate a resistance setting signal; the selection switch is connected with the output end of the controller and used for receiving the resistance setting signal and communicating at least one of the plurality of resistors with the output end of the selection switch according to the resistance setting signal; and the driving circuit is connected with the output end of the selection switch to generate a Pulse Width Modulation (PWM) signal for controlling the on-off of the power semiconductor switch according to the connected resistor, wherein the duty ratio of the PWM signal is related to the connected resistor.
Description
Technical Field
The utility model relates to a current control device, a mechanical switch subassembly and a dual power supply controller for controlling electromagnet coil electric current.
Background
Electromagnets are widely used as drive mechanisms for driving mechanical switches. For example, in a dual power controller, an electromagnet is used as a driving mechanism for driving a power transfer switch, and the magnitude of the current flowing through the coil of the electromagnet determines the magnitude of the driving force applied by the electromagnet to the mechanical switch. In a dual-power controller product using an electromagnet as a driving mechanism, the rated current of an electromagnet coil is determined at the beginning of product design, and once the product is produced, the rated current cannot be changed, so that the product models are numerous, and the dual-power controller product is inconvenient for users to use.
Disclosure of Invention
An aspect of the utility model provides a current control device for controlling electromagnet coil electric current, it includes: the power semiconductor switch is connected with the electromagnet in series; the controller is connected with external equipment and used for receiving the current parameters of the electromagnet coil from the external equipment to generate a resistance setting signal; the selection switch is connected with the output end of the controller and used for receiving the resistance setting signal and communicating at least one of the plurality of resistors with the output end of the selection switch according to the resistance setting signal; and the driving circuit is connected with the output end of the selection switch to generate a Pulse Width Modulation (PWM) signal for controlling the on-off of the power semiconductor switch according to the connected resistor, wherein the duty ratio of the PWM signal is related to the connected resistor.
With the utility model discloses an aspect combines ground, current control device still includes sampling feedback circuit for gather and flow through the sampling feedback signal that the electric current of electromagnet coil is correlated with. The driving circuit is further connected with the output end of the sampling feedback circuit and used for receiving the sampling feedback signal, generating a reference voltage according to the connected resistor and controlling the duty ratio of the PWM signal according to the reference voltage and the sampling feedback signal.
In combination with an aspect of the present invention, the sampling feedback signal is a voltage signal, and the driving circuit controls the duty ratio of the PWM signal according to a comparison of the voltage signal with the reference voltage.
With an aspect of the present invention in combination, the driving circuit is further connected to the input of the controller, for outputting the sampling feedback signal to the controller.
With an aspect of the present invention in combination, the current control apparatus further includes: a digital isolation device connected between the controller and the selection switch; wherein the controller outputs the resistance setting signal to the selection switch via the digital isolation device.
With an aspect of the present invention in combination, the current control apparatus further includes: a digital isolation device, one side of which is connected to the controller, and the other side of which is connected to the selection switch and the drive circuit; wherein the controller outputs the resistance setting signal to the selection switch via the digital isolation device; and the drive circuit outputs the sampled feedback signal to the controller via the digital isolation device.
With an aspect of the present invention in combination, the selection switch is a serial peripheral interface SPI digital switch.
According to another aspect of the present invention, there is provided a mechanical switch assembly comprising a mechanical switch and an electromagnet for driving the mechanical switch, wherein the electromagnet is connected to a current control device according to any one of the preceding claims.
According to another aspect of the present invention, there is provided a dual power controller, including: a first power switch for connecting to a first power source; a second power switch for connecting to a second power source; an interlock unit for interlocking the first power switch and the second power switch such that the first power switch and the second power switch cannot be closed simultaneously, the first power switch and/or the second power switch being a mechanical switch assembly as described above.
In combination with another aspect of the present invention, the controller of the current control device to which the first power switch is connected is further connected to the first power source, and is configured to output a control signal for generating a PWM pulse drive signal to a drive circuit of the current control device when it is monitored that the first power source is abnormal; and the controller in the current control device connected with the second power switch is also connected with the second power supply and used for outputting a control signal for generating a PWM pulse driving signal to a driving circuit in the current control device under the condition that the second power supply is monitored to be abnormal.
According to the utility model discloses a current control device can conveniently change the resistance value through for example human-computer interface and change the electric current of electromagnet coil in a flexible way. The mechanical switch assembly connected to the current control device can be used in different electrical apparatuses due to the current with variable electromagnet coils. The double-power-supply controller comprising the current control device or the mechanical switch assembly can be suitable for different double-power-supply environments due to the fact that the double-power-supply controller has variable electromagnet current, the model number of a double-power-supply-controller product is reduced, the application range is enlarged, and convenience is brought to users.
Drawings
These and/or other aspects, features and advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic structure of a current control device for an electromagnet according to an embodiment of the present invention;
fig. 2 shows a schematic structure of a current control device for an electromagnet according to another embodiment of the present invention;
fig. 3 shows a schematic structure of a current control device for an electromagnet according to still another embodiment of the present invention;
fig. 4 shows a schematic structure of a mechanical switch assembly according to an embodiment of the present invention; and
fig. 5 shows a schematic structure of a dual power controller according to an embodiment of the present invention.
Detailed Description
The present disclosure will be described in detail below with reference to exemplary embodiments thereof. However, the present disclosure is not limited to the embodiments described herein, which may be embodied in many different forms. The described embodiments are intended only to be exhaustive and complete of the disclosure and to fully convey the concept of the disclosure to those skilled in the art. Features of the various embodiments described may be combined with each other or substituted for each other unless expressly excluded or otherwise excluded in context.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another.
In the drawings, the same reference numerals denote constituent elements of the same or similar structures or functions, and a repetitive description thereof will be omitted in the following description.
Fig. 1 shows a schematic structure of a current control device for an electromagnet according to the present invention.
Referring to fig. 1, a current control device 10 according to the present invention is used to control the current of the coil of an electromagnet L. The current control device 10 includes a power semiconductor switch 110, a controller 120, a selection switch 130, a plurality of resistors R1-R4, and a driving circuit 140. The number of resistors may be arbitrary and is not limited to R1-R4.
A power semiconductor switch 110 is connected in series with the electromagnet L to control whether current flows through the coil of the electromagnet L. The power semiconductor switches 110 may be IGBTs, MOSFETs, etc.
The controller 120 is connected to an external device for receiving the electromagnet coil current parameter from the external device to generate a resistance setting signal. The electromagnet coil current parameter may be, for example, a desired value i of the current flowing through the coil of the electromagnet L, which is obtained based on the application scenario of the electromagnet L, or another parameter related to this desired value i of the current. The controller 120 may be a single chip such as a Micro Control Unit (MCU) or other device utilizing hardware, software or a combination thereof to implement the corresponding functions described herein. The external device may be, for example, a computer, a smart phone, or other terminal device having a human-machine interface capable of communicatively coupling with the controller 120 to receive user instructions and transmit the instructions to the controller 120 for processing.
The selection switch 130 is connected to an output terminal of the controller 120, and is configured to receive the resistance setting signal and connect at least one of the resistors R1-R4 to the output terminal of the selection switch 130 according to the resistance setting signal.
The driver circuit 140 is connected to the output of the selector switch 130 for generating a pulse width modulated PWM signal for controlling the switching of the power semiconductor switch 110 in dependence on the connected resistance, wherein the duty cycle of the PWM signal is dependent on the connected resistance.
For example, in an application scenario where the current control device 10 is used to control the current of the electromagnet coil in a dual power controller, a user inputs a desired value i of the current required by the electromagnet L to drive the power transfer switch to the controller 120 through an external device. The controller 120 receives the desired current value i and generates a resistance setting signal. The resistance setting signal may indicate, for example, a resistance value R required to achieve the desired current value i, or indicate the on/off manner of the selection switch 130 and the respective resistors R1 to R4. The selection switch 130 may be, for example, a Serial Peripheral Interface (SPI) digital switch capable of receiving serial data from the controller 120. The data input port DIN of the SPI digital switch is connected to the output of the controller 120 to receive the resistance setting signal. Then, the SPI digital switch operates 4 switches, which are internally connected to the resistors R1-R4, respectively, to be closed or opened according to the resistance setting signal to connect at least one of the resistors R1-R4 to the output terminal thereof, thereby forming the desired resistance value R. The connection positions of the respective resistors and the respective switches within the selection switch 130 are shown in the drawings only for convenience of illustration, the resistance value R finally formed by the selection switch 130 may be formed by a combination of one or more of the respective resistance values R1-R4 in parallel, and the respective resistors R1-R4 may have the same or different resistance values. The output of the SPI digital switch is connected to the driver circuit 140. The drive circuit 140 determines the duty cycle of the pulse width modulated PWM signal to be applied to the power semiconductor switch 110 in dependence on the formed resistance value R, so that the current flowing through the coil of the electromagnet L reaches the current desired value i.
As such, according to the present invention, the current control device 10 controls the current flowing through the electromagnet coil by controlling the resistance value related to the duty ratio of the PWM signal of the power semiconductor switch driving the electromagnet, so that the user can conveniently set the desired electromagnet coil current value through the human-machine interface.
In order to control the current of the electromagnet coil more accurately and stably, a closed-loop control mode can be further adopted. For example, when the current flowing through the solenoid coil is higher than the desired value i, the duty ratio of the PWM signal is decreased so that the current is decreased to approach the desired value i of the current, and when the current flowing through the solenoid coil is lower than the desired value i, the duty ratio of the PWM signal is increased so that the current is increased to approach the desired value i of the current. Described below in conjunction with fig. 2.
Fig. 2 shows a schematic structure of a current control device for controlling an electromagnet according to another embodiment of the present invention.
Referring to fig. 2, the difference from fig. 1 is that the current control apparatus 10 may further include a sampling feedback circuit 150 for acquiring a sampling feedback signal associated with the current flowing through the electromagnet coil. The driver circuit 140 is connected to an output of the sampling feedback circuit 150 for receiving the sampling feedback signal.
The drive circuit 140 may combine the sampled feedback signal with a reference voltage V associated with a desired current i of the electromagnet coil ref To control the duty cycle of the PWM signal. The reference voltage V ref The driving circuit 140 is generated according to the resistance value R formed by the selection switch 130.
For example, the sampling feedback circuit 150 may include a sampling resistor R in series with the electromagnet L and the power semiconductor switch 110 S . Sampling resistor R S One terminal of which is connected to the power semiconductor switch 110 and the other terminal is grounded. The driving circuit 140 is connected to the sampling resistor R S A connection point with the power semiconductor switch 110 to obtain a sampling resistance R S Voltage signal V at both ends RS The voltage signal V RS I.e. as a sampled feedback signal. Here with a voltage signal V RS As a sampled feedback signal is merely an example. The sampled feedback signal may be a signal other than a voltage signal that reflects the current of the electromagnet. And, here, with the sampling resistor R s The sampling feedback circuit 150 is also merely an example, and other circuits such as a current transformer may be usedReplacement of sampling resistor R by an equivalent function element s 。
As an example, the period of the PWM signal may be provided by a periodic clock pulse signal. The driving circuit 140 may compare the reference voltage V with a comparator for each clock cycle of the PWM signal ref Sum voltage signal V RS . For example, at the rising edge of each clock pulse signal, the driving circuit 140 outputs a high level when the voltage signal V is collected RS Less than the reference voltage (V) RS <V ref ) When the current flowing through the electromagnet is smaller than the set current expected value i, the driving circuit 140 maintains the high-level output, the current flowing through the electromagnet gradually increases, and when the acquired voltage signal V is smaller than the set current expected value i RS Less than the reference voltage (V) RS >V ref ) The output of the driving circuit 140 outputs a low level and remains until the next clock pulse arrives. As another example, if at each clock pulse signal rising edge, the voltage signal V is collected RS Greater than a reference voltage V ref (V RS >V ref ) The output of the driving circuit 140 may first output a high level for a minimum duty cycle (e.g., 8%) and then output a low level and remain until the next clock pulse.
In this way, the closed-loop control mode can make the current flowing through the electromagnet always approach the expected value preset by the user, and in the application scene of a dual-power controller, for example, the sufficient driving force of the electromagnet on the power supply change-over switch can be established and maintained.
In addition, the driving circuit 140 may also be connected to the controller 120 to output a sampling feedback signal to the controller 120. The controller 120 can determine whether the circuit is abnormal according to the sampling feedback signal so as to take protective measures and the like.
Fig. 3 shows a schematic structure of a current control device for an electromagnet according to another embodiment of the present invention.
Referring to fig. 3, the current control device 10 may further include a digital isolation device 160.
In one example, a digital isolation device 160 is connected between the controller 120 and the selection switch 130 for forming an electrical digital isolation between the controller 120 and the selection switch 130 to prevent the two from being damaged when transmitting signals therebetween. And, more importantly, electrical isolation between the controller 120 and the drive circuit 140 for driving the electromagnet L can be achieved, which makes the design safer since the drive circuit 140 is dangerously charged. The controller 120 outputs a resistance setting signal to the selection switch 130 via the digital isolation device 160.
The digital isolation device 160 magnetically or capacitively couples data to the other end of the isolation gate using a transformer or capacitor, can support faster data transmission speed, and has a longer life span than using an opto-coupler isolation device for isolation.
In another example, the digital isolation device 160 may also be connected to the controller 120 on one side and to the selection switch 130 and the driving circuit 140 on the other side. The controller 120 outputs a resistance setting signal to the selection switch 130 via the digital isolation device 160, and the driving circuit 140 outputs a sampled feedback signal (e.g., a voltage signal V) to the controller 120 via the digital isolation device 160 RS )。
The numerical isolation device may be, for example, an SPI digital isolation device or other digital isolation device.
Fig. 4 shows a schematic structure of a mechanical switch assembly according to an embodiment of the present invention.
The mechanical switch assembly 40 includes a mechanical switch 401 and an electromagnet L that drives the mechanical switch 401. The electromagnet L is connected to the current control device 10. The current control device 10 may be designed as any of the current control devices 10 described above in fig. 1 to 3.
When a current flows through the electromagnet L, the electromagnet L generates a magnetic field, thereby generating a driving force for driving the mechanical switch 401 to operate. The magnitude of the current flowing through the electromagnet L determines the magnitude of the driving force it generates. When a sufficiently large current flows through the electromagnet L, the electromagnet drives the mechanical switch 401 to perform a switching action, such as closing or opening.
Since the current control device 10 according to the present invention can ensure that the current flowing through the electromagnet L is sufficiently large (e.g., reaches the current desired value i preset by the user) and stable, the mechanical switch assembly 40 can reliably drive the mechanical switch 401 to open when a line or equipment failure occurs. According to the utility model discloses mechanical switch subassembly 40 can use for example in electrical protection equipment such as dual power supply controller, circuit breaker.
Fig. 5 shows a schematic structure of a dual power controller according to an embodiment of the present invention.
Fig. 5 shows a schematic structural diagram of the dual power controller 50 according to an embodiment of the present invention. The dual power controller 50 includes a first power switch 501, a second power switch 502, and an interlock unit 503. The first power switch 501 is connected to a first power supply 504. The second power switch 502 is connected to a second power source 505. The interlock unit 503 interlocks the first power switch 501 and the second power switch 502 so that the first power switch 501 and the second power switch 502 cannot be closed at the same time. The first power switch 501 and/or the second power switch 502 are mechanical switch assemblies as described above in connection with fig. 4.
Dual power controllers are required for load circuits that do not allow or have serious consequences for power outages. The first power supply 504 and the second power supply 505 can be switched by the dual power controller 50. For example, the first power supply 504 is used as a main power supply to supply power to a load circuit, and when the first power supply 504 is abnormal (for example, voltage loss, overvoltage, phase loss, frequency abnormality, etc.), the first power switch 501 is turned off, and the second power switch 502 is turned on, the second power supply 505 is used as a backup power supply to supply power to the device, and vice versa. The interlock unit 503 may ensure that the first power switch 501 and the second power switch 502 cannot be closed at the same time. The first power switch 501 and/or the second power switch 502 according to the embodiment of the present invention are reliably turned off because they have a sufficient and stable driving force due to the connection with the current control device 10 according to the present invention.
In some embodiments, the electromagnets in the first power switch 501 and the second power switch 502 may also be powered by the first power source 504 and the second power source 505, respectively. For example, the electromagnets may be fed with current rectified from the first power supply 504 and the second power supply 505, respectively.
In some embodiments, the controller 120 in the current control apparatus 10 may monitor the state parameter of the first power supply 504 or the second power supply 505 in use to determine whether an abnormality occurs in the first power supply or the second power supply, and send a control signal for causing the driving circuit 140 to generate a PWM signal to the driving circuit 140 if it is determined that an abnormality occurs in the first power supply or the second power supply, so that the electromagnet L drives the first power supply switch 501 or the second power supply switch 502 to operate.
In some embodiments, the power controller connected to the first power switch and the power controller connected to the second power switch may be the same controller. Also, the interlock unit 503 may be controlled by the controller.
The aforesaid is according to the utility model discloses an electromagnet coil current value that current control device can provide is that can change in a flexible way to the user only needs to set up the electromagnet coil current value that expects through human-computer interface and just can realize this kind of change, and need not to change the product. In addition, the current control device can keep the current supplied to the electromagnet coil stable and reliable through closed-loop control; the collected current information of the electromagnet coil is fed back to the controller in real time, and even further fed back to a user through a human-computer interface, so that protective measures can be taken when the current of the electromagnet coil is abnormal; and the adoption of a digital isolation device instead of an optical coupler isolation device can avoid the potential reliability hazard caused by the service life of the optical coupler. A dual power controller according to the present invention, which includes or is connected to such a current control device, also has the aforementioned benefits, and is particularly adaptable to different dual power source conversions, such as when the dual power controller is migrated from a dual power source (e.g., 220 volts) for controlling one specification to a dual power source (e.g., 400 volts) for controlling another specification, only the desired electromagnet coil current value needs to be reset without replacing the entire dual power controller product.
The block diagrams of circuits, devices, apparatus, devices, and systems presented herein are meant to be illustrative examples only and are not intended to require or imply that the blocks, devices, and systems shown in the block diagrams must be connected or arranged or configured in a manner consistent with the teachings of the block diagrams. As will be appreciated by one skilled in the art, these circuits, devices, apparatus, devices, systems may be connected, arranged, configured in any manner that achieves the intended purposes.
It should be understood by those skilled in the art that the foregoing specific embodiments are merely exemplary and not limiting, and that various modifications, combinations, sub-combinations and substitutions may be made in the embodiments of the invention depending upon design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A current control device for controlling a current of an electromagnet coil, comprising:
the power semiconductor switch is connected with the electromagnet in series;
the controller is connected with external equipment and used for receiving the current parameters of the electromagnet coil from the external equipment to generate a resistance setting signal;
the selection switch is connected with the output end of the controller and used for receiving the resistance setting signal and communicating at least one of the plurality of resistors with the output end of the selection switch according to the resistance setting signal; and
and the driving circuit is connected with the output end of the selection switch to generate a Pulse Width Modulation (PWM) signal for controlling the on-off of the power semiconductor switch according to the connected resistor, wherein the duty ratio of the PWM signal is related to the connected resistor.
2. The current control device of claim 1, further comprising:
a sampling feedback circuit for acquiring a sampling feedback signal associated with the current flowing through the electromagnet coil; wherein
The driving circuit is further connected with the output end of the sampling feedback circuit and used for receiving the sampling feedback signal, generating a reference voltage according to the connected resistor and controlling the duty ratio of the PWM signal according to the reference voltage and the sampling feedback signal.
3. Current control device according to claim 2,
the sampled feedback signal is a voltage signal, and
the driving circuit controls the duty ratio of the PWM signal according to the comparison of the voltage signal and the reference voltage.
4. Current control device according to claim 2,
the driving circuit is also connected to the input end of the controller and is used for outputting the sampling feedback signal to the controller.
5. The current control device according to claim 1 or 2, characterized by further comprising:
the digital isolation device is connected between the controller and the selection switch; wherein
The controller outputs the resistance setting signal to the selection switch via the digital isolation device.
6. The current control device of claim 2, further comprising:
one side of the digital isolation device is connected to the controller, and the other side of the digital isolation device is connected to the selection switch and the driving circuit; wherein
The controller outputs the resistance setting signal to the selection switch via the digital isolation device; and
the drive circuit outputs the sampled feedback signal to the controller via the digital isolation device.
7. Current control device according to claim 1,
the selection switch is a Serial Peripheral Interface (SPI) digital switch.
8. A mechanical switch assembly comprising a mechanical switch and an electromagnet for actuating the mechanical switch, wherein the electromagnet is connected to a current control device according to any one of claims 1 to 7.
9. A dual power controller, comprising:
a first power switch for connecting to a first power source;
a second power switch for connecting to a second power source;
an interlock unit for interlocking the first power switch and the second power switch so that the first power switch and the second power switch cannot be closed at the same time,
the first power switch and/or the second power switch is a mechanical switch assembly as claimed in claim 8.
10. Dual power supply controller according to claim 9,
the controller in the current control device connected with the first power switch is also connected with the first power supply and used for outputting a control signal for generating a PWM pulse driving signal to a driving circuit in the current control device under the condition that the first power supply is monitored to be abnormal;
and the controller in the current control device connected with the second power switch is also connected with the second power supply and used for outputting a control signal for generating a PWM pulse driving signal to a driving circuit in the current control device under the condition that the second power supply is monitored to be abnormal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826607.5U CN217181428U (en) | 2022-04-11 | 2022-04-11 | Electromagnet coil current control device, mechanical switch assembly and double-power-supply controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826607.5U CN217181428U (en) | 2022-04-11 | 2022-04-11 | Electromagnet coil current control device, mechanical switch assembly and double-power-supply controller |
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| CN217181428U true CN217181428U (en) | 2022-08-12 |
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| CN202220826607.5U Active CN217181428U (en) | 2022-04-11 | 2022-04-11 | Electromagnet coil current control device, mechanical switch assembly and double-power-supply controller |
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| CN (1) | CN217181428U (en) |
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