CN217008011U - Current controller, mechanical switch assembly and dual power controller - Google Patents
Current controller, mechanical switch assembly and dual power controller Download PDFInfo
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- CN217008011U CN217008011U CN202220588725.7U CN202220588725U CN217008011U CN 217008011 U CN217008011 U CN 217008011U CN 202220588725 U CN202220588725 U CN 202220588725U CN 217008011 U CN217008011 U CN 217008011U
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Abstract
The present invention relates to a current controller, a mechanical switch assembly and a dual power controller for controlling the current through an electromagnet. The current controller includes: the power semiconductor switch is used for being connected with the electromagnet in series; a signal acquisition device for acquiring a signal corresponding to a current flowing through the electromagnet; and the driving circuit is connected with the output end of the signal acquisition device and the control end of the power semiconductor switch, and is used for receiving the acquired signals and generating and outputting Pulse Width Modulation (PWM) signals for controlling the on-off of the power semiconductor switch according to the acquired signals so as to keep the current flowing through the electromagnet stable.
Description
Technical Field
The present invention relates to a current controller for controlling the current through an electromagnet, a mechanical switch assembly and a dual power controller.
Background
For loads such as high-rise buildings, hospitals, banks, fire fighting, chemical engineering and the like which do not allow power outage, and loads such as loads of the second type which cause serious production stop, shutdown and local traffic jam due to power outage, power supply of the loads needs to be supplied by two power sources, and automatic switching can be performed between the two power sources, so that the reliability, safety and continuity of power supply of the loads are guaranteed. The dual-power controller can well solve the problems and provide powerful guarantee for reliable and continuous power supply. Dual power controllers are used in many businesses and areas.
The double-power-supply controller can drive the mechanical switch to switch on or off by taking the electromagnet as a switch driving mechanism. The current flowing through the electromagnet determines the magnitude of the driving force, which may be affected by power supply voltage fluctuations or environmental factors, and thus it is very important to control the current flowing through the electromagnet.
SUMMERY OF THE UTILITY MODEL
The present invention relates to a current controller for controlling the current through an electromagnet, a mechanical switch assembly and a dual power controller. The current controller, the mechanical switch assembly and the dual-power controller can keep the current flowing through the electromagnet stable, so that the driving force of the electromagnet on the mechanical switch is kept stable.
Embodiments of the utility model relate to a current controller for controlling current through an electromagnet, comprising: the power semiconductor switch is used for being connected with the electromagnet in series; a signal acquisition device for acquiring a signal corresponding to a current flowing through the electromagnet; and the driving circuit is connected with the output end of the signal acquisition device and the control end of the power semiconductor switch, and is used for receiving the acquired signals and generating and outputting Pulse Width Modulation (PWM) signals for controlling the on-off of the power semiconductor switch according to the acquired signals so as to keep the current flowing through the electromagnet stable.
According to some embodiments of the utility model, the driving circuit further comprises a current amplitude setting unit capable of setting different current amplitudes for the current flowing through the electromagnet.
According to some embodiments of the utility model, the signal collected by the signal collection device is a voltage signal; and the drive circuit controls the duty ratio of the pulse width modulation signal according to the comparison of the collected voltage signal and the reference voltage.
According to some embodiments of the utility model, the driving circuit further comprises a current amplitude setting unit capable of setting different current amplitudes for the current flowing through the electromagnet; and the current amplitude setting unit provides a plurality of different reference voltages for the driving circuit.
According to some embodiments of the present invention, the current magnitude setting unit includes a selection switch and a plurality of resistors of different resistance values; the current amplitude setting unit is communicated with one of the resistors with different resistance values according to the selection of the selection switch so as to provide corresponding reference voltage.
According to some embodiments of the utility model, the selection switch is a dip switch.
The embodiment of the utility model also relates to a mechanical switch assembly which comprises a mechanical switch and an electromagnet for driving the mechanical switch, and is characterized in that the electromagnet is connected with the current controller.
Embodiments of the present invention also relate to a dual power controller, which includes: a first power switch for connecting to a first power source; a second power switch for connecting to a second power source; and the interlocking unit is used for interlocking the first power switch and the second power switch so that the first power switch and the second power switch can not be closed at the same time, and the first power switch and/or the second power switch are/is the mechanical switch assembly.
According to the current controller of the present invention, the mechanical switch assembly and the dual power controller collect the current flowing through the electromagnet and feed a signal corresponding thereto to the driving circuit, which controls the on and off of the power semiconductor switch connected in series with the electromagnet in a Pulse Width Modulation (PWM) manner to stabilize the current flowing through the electromagnet. For example, in the case where the power supply voltage increases, the current flowing through the electromagnet does not increase due to the increase in the power supply voltage, and therefore the driving force of the electromagnet on the mechanical switch is always kept constant, thereby avoiding malfunction of the mechanical switch and thus undesired power cutoff or energization. Under the condition that the power supply voltage is reduced, the current flowing through the electromagnet cannot be reduced due to the reduction of the power supply voltage, so that the driving force of the electromagnet on the mechanical switch is always kept constant, and the problem that the electromagnet cannot provide enough driving force when the mechanical switch is required to be switched on or off is avoided. In addition, under the condition that the impedance of the coil of the electromagnet changes due to the change of the environmental temperature, the current controller, the mechanical switch assembly and the dual-power controller according to the utility model can still ensure the stability of the current flowing through the electromagnet through PWM control, so that the stability of the driving force of the electromagnet on the mechanical switch can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. The drawings in the following description are merely exemplary embodiments of the utility model.
Figure 1 shows a schematic diagram of a current controller according to an embodiment of the utility model,
figure 2 shows a schematic diagram of a current controller according to an embodiment of the utility model,
figure 3 shows a schematic diagram of a current controller according to another embodiment of the utility model,
figure 4 shows a schematic diagram of a current controller according to another embodiment of the utility model,
figure 5 shows a schematic structural view of a mechanical switch assembly according to an embodiment of the utility model,
fig. 6 illustrates a schematic structural diagram of a dual power controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the utility model and not all embodiments of the utility model, with the understanding that the utility model is not limited to the example embodiments described herein.
In the present specification and the drawings, substantially the same or similar steps and elements are denoted by the same or similar reference numerals, and repeated descriptions of the steps and elements will be omitted. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or order.
In the specification and drawings, elements are described in singular or plural according to embodiments. However, the singular and plural forms are appropriately selected for the proposed case only for convenience of explanation and are not intended to limit the present invention thereto. Thus, the singular may include the plural, and the plural may also include the singular, unless the context clearly dictates otherwise. In the embodiments of the present invention, "connected" does not mean that "directly connected" or "directly contacted" is necessary, and only electrical communication is required, unless otherwise specifically stated.
Fig. 1 shows a schematic structural diagram of a current controller 100 according to an embodiment of the present invention. The current controller 100 is used to control the current flowing through the electromagnet 510. The current controller 100 comprises a power semiconductor switch 110, a signal acquisition device 120 and a drive circuit 130. The power semiconductor switch 110 is connected in series with the electromagnet 510 for switching the current in the series circuit. The power semiconductor switch 110 may be, for example, a MOSFET, an IGBT, or the like. The signal acquisition device 120 acquires a signal corresponding to the current flowing through the electromagnet. The driving circuit 130 is connected to the output terminal of the signal collecting device 120 and the control terminal of the power semiconductor switch 110, and is configured to receive the collected signal, and generate and output a Pulse Width Modulation (PWM) signal for controlling the on/off of the power semiconductor switch 110 according to the collected signal, so as to stabilize the current flowing through the electromagnet 510. The steady current flowing through the electromagnet 510 may establish a steady magnetic field whose magnetic force may thus act as a driving force to actuate the action of the associated mechanical switch.
For example, the current controller 100 shown in fig. 1 may operate as follows. When the current detected by the signal acquisition device 120 exceeds a threshold value, the duty ratio of the PWM is reduced, so that the current is reduced; when the current drops below the threshold value, the duty ratio of the PWM is increased, so that the current rises, and dynamic stabilization of the current is realized.
In some embodiments, the current controller 100 shown in fig. 1 may operate as follows. Setting an upper limit threshold and a lower limit threshold, when the current detected by the signal acquisition device 120 is smaller than the upper limit threshold and larger than the lower limit threshold, keeping the duty ratio of the PWM unchanged, and when the current detected by the signal acquisition device 120 exceeds the upper limit threshold, reducing the duty ratio of the PWM to reduce the current; when the current drops below the lower threshold, the duty ratio of the PWM is increased, so that the current rises, and the dynamic stabilization of the current is realized.
In some embodiments, the driving circuit 130 further includes a current amplitude setting unit 131 capable of setting different current amplitudes for the current flowing through the electromagnet 510. Adaptation to different electromagnets with the same current controller 100 can be achieved by the current amplitude setting unit 131. Thus, in different models of products incorporating the current controller, such as in different models of dual power controllers, the same current controller may be employed, thereby eliminating the need to procure different types of current controllers. For example, if the current required for the electromagnet 510 to generate sufficient driving force rises, the duty ratio of the PWM signal may be increased by increasing the threshold value compared with the detected current by the current amplitude setting unit 131, thereby increasing the current flowing through the electromagnet 510. Conversely, if the current required for the electromagnet 510 to generate sufficient driving force decreases, the duty ratio of the PWM signal may be decreased by decreasing the threshold value by the current amplitude setting unit 131, thereby decreasing the current flowing through the electromagnet 510.
Fig. 2 shows a schematic structural diagram of a current controller 200 according to another embodiment of the present invention. Current controller 200 embodies signal acquisition device 120 of fig. 1 as a resistor 220. The resistor 220 is connected in series with the electromagnet 510 and the power semiconductor switch 110, and one end is grounded. The voltage signal collected by the other end of the resistor 220 is a signal V corresponding to the current flowing through the electromagnetsense. The driving circuit 230 may compare the collected voltage signal V with a comparatorsenseAnd a reference voltage VrefComparing, and controlling PWM signal according to the comparison resultThe duty cycle of (c).
In some embodiments, the period of the PWM signal may be provided by a periodic clock pulse signal. At the beginning of each clock pulse signal, i.e. at the rising edge, the output of the driving circuit 230 is high if the collected voltage signal VsenseLess than a reference voltage Vref(Vsense<Vref) The output of the driving circuit 230 remains high, and the current flowing through the series circuit of the electromagnet 510, the power semiconductor switch 110 and the resistor 220 increases, so that the acquired voltage signal V increasessenseAlso gradually increases when the voltage signal V is collectedsenseGreater than a reference voltage Vref(Vsense>Vref) At this time, the output terminal of the driving circuit 230 becomes low and remains on until the next clock pulse comes. Furthermore, at the beginning of each clock pulse signal, i.e. at the rising edge, if the voltage signal V is picked upsenseGreater than a reference voltage Vref(Vsense>Vref) The output of the driving circuit 230 may first output a high level for a minimum duty cycle, e.g., 8%, and then go low and remain until the next clock pulse arrives. The current through the electromagnet 510 can be maintained at a preset or desired value by the pulse width modulation scheme described above, so that a sufficiently large magnetic field can be established to effectively actuate the associated mechanical switch.
Fig. 3 shows a schematic structural diagram of a current controller 300 according to another embodiment of the present invention. The current controller 300 differs from the current controller 200 in fig. 2 in that: the driving circuit 100 further includes a current amplitude setting unit 331 capable of setting different current amplitudes for the current flowing through the electromagnet; and the current amplitude setting unit 331 is capable of providing a plurality of different reference voltages V for the driving circuit 330ref. For example, the reference voltage V may be set by connecting a resistor 340 to the input terminal of the current amplitude setting unit 131refOne end of the resistor 340 is connected to the input end of the current amplitude setting unit 131, and the other end is grounded. By selecting different sizes of resistors 340, a plurality of different reference voltages V can be provided for the driving circuit 330ref. In some examples, the resistor 340 may be an adjustable resistor, and the reference voltage V may be adjusted by adjusting the resistance of the resistor 340ref。
Fig. 4 shows a schematic diagram of a current controller 400 according to another embodiment of the present invention. In this embodiment, the current magnitude setting unit 431 may include a selection switch 440 and a plurality of resistors 451, 452, 453, 454 having different resistance values. The current magnitude setting unit 431 is connected to one of the resistors 451, 452, 453, 454 with different resistance values according to the selection of the selection switch 440 to provide the corresponding reference voltage Vref. In some embodiments, the selector switch 440 is a toggle switch.
The current controller 400 can conveniently set the reference voltage V using such a selection switch 440refThereby setting the magnitude of the current flowing through the electromagnet 510. Thus, for different models of equipment having the same current controller 400, the appropriate reference voltage V may be selected for different electromagnets 510refI.e. a suitable current magnitude is selected so that the electromagnet generates a sufficient magnetic force as a driving force.
For different types of devices, such as mechanical switch assemblies for switching off different current levels, different sizes of electromagnets are required to generate different levels of magnetic force. Therefore, in order to adapt electromagnets of different sizes, the design of the current controller needs to be changed, i.e. the current flowing through the electromagnet is matched to the size (e.g. number of turns or form of iron core) of the current electromagnet by the current controller. This requires different current controllers to be designed for different models of equipment, thereby increasing complexity and cost in the design process and circuit board manufacturing process. According to the embodiment of the utility model, by adding the selection switch in the current controller, on one hand, the same design can be adopted for equipment with different signals, and on the other hand, the selection switch can be adapted to electromagnets with different sizes adopted in different equipment. Thereby simplifying the design process and the circuit board manufacturing process.
Fig. 5 shows a schematic structural diagram of a mechanical switch assembly 500 according to an embodiment of the utility model. The mechanical switch assembly 500 includes a mechanical switch 520 and an electromagnet 510 that drives the mechanical switch 520. The electromagnet 510 is connected to the current controller 100. The current controller 100 may be designed as any of the current controllers 100 described above in fig. 1-4.
When a current flows through the electromagnet 510, the electromagnet generates a magnetic field whose magnetic force can drive the operation of the mechanical switch 520 as a driving force. The magnitude of the current flowing through the electromagnet determines the magnitude of the magnetic field, i.e., the magnetic force, generated. When a sufficiently large current flows through the electromagnet, the electromagnet actuates the mechanical switch 520, e.g., opens.
The mechanical switch assembly 500 according to the embodiment of the present invention can ensure that the current flowing through the electromagnet is sufficiently large and stable to reliably drive the mechanical switch 520 to open in the event of a line or equipment failure. The mechanical switch assembly 500 according to the embodiment of the present invention may be applied to electrical protection devices such as a dual power controller, a circuit breaker, etc., for example.
Fig. 6 illustrates a schematic structural diagram of a dual power controller 600 according to an embodiment of the present invention. The dual power controller 600 includes a first power switch 620, a second power switch 640, and an interlock unit 650. The first power switch 620 is connected to the first power source 610. The second power switch 640 is connected to the second power source 630. The interlock unit 650 interlocks the first power switch 620 and the second power switch 640 such that the first power switch 620 and the second power switch 640 cannot be simultaneously closed. The first power switch 620 and/or the second power switch 640 are mechanical switch assemblies as described above with reference to fig. 5.
Dual power controllers are needed for loads that do not allow or have serious consequences for power outages. The first power supply 610 and the second power supply 630 may be switched by the dual power controller 600. For example, when the first power supply 610 is failed, the first power switch 620 is turned off and the second power switch 640 is turned on, the device is powered by the second power supply 630 as a backup power supply, and vice versa. The interlock unit 650 may ensure that the first power switch 620 and the second power switch 640 cannot be closed at the same time. The first power switch 620 and/or the second power switch 640 according to the embodiment of the present invention may be reliably turned off with a sufficient and stable driving force due to the connection with the current controller 100 according to the embodiment of the present invention.
In some embodiments, the electromagnets in the first power switch 620 and the second power switch 640 may also be powered by the first power source 610 and the second power source 630, respectively. For example, the current in the first power supply 610 and the second power supply 630 may be collected and fed to the electromagnet after being rectified into direct current.
According to the current controller, the mechanical switch assembly and the dual-power controller collect the current flowing through the electromagnet and feed a signal corresponding to the current to the driving circuit, and the driving circuit controls the on and off of the power semiconductor switch connected with the electromagnet in series in a PWM mode so as to keep the current flowing through the electromagnet stable. For example, in the case where the power supply voltage increases, the current flowing through the electromagnet does not increase due to the increase in the power supply voltage, and therefore the driving force of the electromagnet on the mechanical switch is always kept constant, thereby avoiding malfunction of the mechanical switch and thus undesired power cutoff or energization. Under the condition that the power supply voltage is reduced, the current flowing through the electromagnet is not reduced due to the reduction of the power supply voltage, so that the driving force of the electromagnet on the mechanical switch is always kept constant, and the problem that the electromagnet cannot provide enough driving force when the mechanical switch is required to perform disconnection operation is avoided. In addition, under the condition that the impedance of the coil of the electromagnet changes due to the change of the environmental temperature, the current controller, the mechanical switch assembly and the dual-power controller can still ensure the stability of the current flowing through the electromagnet through PWM control, so that the stability of the driving force of the electromagnet on the mechanical switch can be ensured.
The block diagrams of circuits, units, devices, apparatuses, devices, systems, etc., referred to in this disclosure are only used as illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by one skilled in the art, these circuits, units, devices, apparatuses, devices, systems may be connected, arranged, configured in any way as long as the desired purpose is achieved. The circuits, units, devices and apparatuses involved in the present invention may be implemented in any suitable manner, for example, by using application specific integrated circuits, Field Programmable Gate Arrays (FPGAs) and the like, or by using a general-purpose processor in combination with a known program.
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 of the embodiments of the utility model may be made in accordance with design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A current controller for controlling current through an electromagnet, comprising:
the power semiconductor switch is used for being connected with the electromagnet in series;
a signal acquisition device for acquiring a signal corresponding to a current flowing through the electromagnet; and
and the driving circuit is connected with the output end of the signal acquisition device and the control end of the power semiconductor switch, and is used for receiving the acquired signals and generating and outputting a Pulse Width Modulation (PWM) signal for controlling the on-off of the power semiconductor switch according to the acquired signals so as to keep the current flowing through the electromagnet stable.
2. The current controller of claim 1,
the drive circuit further includes a current amplitude setting unit capable of setting different current amplitudes for the current flowing through the electromagnet.
3. The current controller of claim 1,
the signal acquired by the signal acquisition device is a voltage signal; and
the drive circuit controls the duty ratio of the pulse width modulation signal according to the comparison of the collected voltage signal and the reference voltage.
4. Current controller according to claim 3,
the driving circuit further comprises a current amplitude setting unit capable of setting different current amplitudes for the current flowing through the electromagnet; and
the current amplitude setting unit provides a plurality of different reference voltages for the driving circuit.
5. The current controller of claim 4,
the current amplitude setting unit comprises a selection switch and a plurality of resistors with different resistance values;
the current amplitude setting unit is communicated with one of the resistors with different resistance values according to the selection of the selection switch so as to provide corresponding reference voltage.
6. The current controller of claim 5, wherein the selection switch is a dial switch.
7. A mechanical switch assembly comprising a mechanical switch and an electromagnet for actuating the mechanical switch, wherein the electromagnet is connected to a current controller according to any one of claims 1 to 6.
8. 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 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220588725.7U CN217008011U (en) | 2022-03-17 | 2022-03-17 | Current controller, mechanical switch assembly and dual power controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220588725.7U CN217008011U (en) | 2022-03-17 | 2022-03-17 | Current controller, mechanical switch assembly and dual power controller |
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| Publication Number | Publication Date |
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| CN217008011U true CN217008011U (en) | 2022-07-19 |
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| CN202220588725.7U Active CN217008011U (en) | 2022-03-17 | 2022-03-17 | Current controller, mechanical switch assembly and dual power controller |
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| CN (1) | CN217008011U (en) |
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- 2022-03-17 CN CN202220588725.7U patent/CN217008011U/en active Active
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