CN220381196U - Voltage acquisition circuit, system and emergency lighting power supply - Google Patents
Voltage acquisition circuit, system and emergency lighting power supply Download PDFInfo
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- CN220381196U CN220381196U CN202322010445.5U CN202322010445U CN220381196U CN 220381196 U CN220381196 U CN 220381196U CN 202322010445 U CN202322010445 U CN 202322010445U CN 220381196 U CN220381196 U CN 220381196U
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Abstract
The application belongs to the technical field of electronic circuits, and provides a voltage acquisition circuit, a system and an emergency lighting power supply. The voltage acquisition circuit comprises a first resistance module, a current transformer module and a second resistance module, wherein the first end of the current transformer module is used for being electrically connected with a live wire of an alternating current power supply, the fourth end of the current transformer module is used for being electrically connected with a zero line of the alternating current power supply, the second end of the current transformer module is respectively electrically connected with the first end of the second resistance module and a controller, the third end of the current transformer module is respectively electrically connected with the second end of the second resistance module and the controller, and the first resistance module is arranged between the first end of the current transformer module and the live wire of the alternating current power supply or between the fourth end of the current transformer module and the zero line of the alternating current power supply. The voltage acquisition circuit provided by the embodiment of the application solves the problems that an existing mains supply voltage acquisition circuit is complex in structure and high in cost.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a voltage acquisition circuit, a system and an emergency lighting power supply.
Background
In emergency lighting power supplies, mains voltage needs to be monitored to achieve a fault alarm function, and the mains voltage is generally monitored through a mains voltage acquisition circuit. The current commercial power voltage acquisition circuit needs to use an operational amplifier and a negative power supply, and is complex in circuit structure and high in cost.
Disclosure of Invention
The embodiment of the application provides a voltage acquisition circuit, a system and an emergency lighting power supply, which can solve the problems that the existing mains voltage acquisition circuit is complex in structure and high in cost.
In a first aspect, an embodiment of the present application provides a voltage acquisition circuit, which is applied to an emergency lighting power supply, and includes a first resistor module, a current transformer module and a second resistor module, where a first end of the current transformer module is used to be electrically connected with a live wire of an ac power supply, a fourth end of the current transformer module is used to be electrically connected with a zero line of the ac power supply, a second end of the current transformer module is respectively electrically connected with a first end of the second resistor module and a controller, a third end of the current transformer module is respectively electrically connected with a second end of the second resistor module and the controller, and the first resistor module is disposed between the first end of the current transformer module and the live wire of the ac power supply or between the fourth end of the current transformer module and the zero line of the ac power supply;
the first resistor module is used for generating a first current according to the voltage provided by the alternating current power supply, the first current flows through the current transformer module, the current transformer module is used for generating a second current according to the first current, the second current flows through the second resistor module, the controller is used for providing a reference voltage for the second resistor module, and the second resistor module is used for generating a first voltage according to the second current and the reference voltage and transmitting the first voltage to the controller; wherein the first current is equal to the second current.
In a possible implementation manner of the first aspect, the first resistor module includes a first resistor, and the first resistor is disposed between a first end of the current transformer module and a live wire of the ac power supply or between a fourth end of the current transformer module and a neutral wire of the ac power supply.
In a possible implementation manner of the first aspect, the second resistor module includes a second resistor, a first end of the second resistor is electrically connected to a second end of the current transformer module and the controller, and a second end of the second resistor is electrically connected to a third end of the current transformer module and the controller, respectively.
In a possible implementation manner of the first aspect, the current transformer module includes a current transformer, a first end of the current transformer is used for being electrically connected with a live wire of the ac power supply, a fourth end of the current transformer is used for being electrically connected with a zero line of the ac power supply, a second end of the current transformer is electrically connected with a first end of the second resistor module and the controller, a third end of the current transformer is electrically connected with a second end of the second resistor module and the controller, and the first resistor module is disposed between the first end of the current transformer and the live wire of the ac power supply or between the fourth end of the current transformer and the zero line of the ac power supply.
In a possible implementation manner of the first aspect, the voltage acquisition circuit further includes a first filter module, a first end of the first filter module is electrically connected with the first end of the current transformer module and the live wire of the ac power supply, a second end of the first filter module is electrically connected with the fourth end of the current transformer module and the neutral wire of the ac power supply, and the first resistor module is disposed between the first end of the current transformer module and the first end of the first filter module or between the fourth end of the current transformer module and the second end of the first filter module.
In a possible implementation manner of the first aspect, the voltage acquisition circuit further includes a second filtering module, where the second filtering module is electrically connected to the second end of the current transformer module, the first end of the second resistor module, and the controller, respectively.
In a possible implementation manner of the first aspect, the voltage acquisition circuit further includes a third filtering module, and the third filtering module is electrically connected to the third end of the current transformer module, the second end of the second resistor module, and the controller, respectively.
In a possible implementation manner of the first aspect, the voltage acquisition circuit further includes a current limiting module, and the current limiting module is electrically connected to the second end of the current transformer module, the first end of the second resistor module, and the controller, respectively.
In a second aspect, an embodiment of the present application provides a voltage acquisition system, including a controller and any one of the voltage acquisition circuits of the first aspect, the second end of the current transformer module and the first end of the second resistor module in the voltage acquisition circuit are all electrically connected with the controller, the third end of the current transformer module and the second end of the second resistor module in the voltage acquisition circuit are all electrically connected with the controller, the first end of the current transformer module in the voltage acquisition circuit is used for being electrically connected with a live wire of an ac power supply, the fourth end of the current transformer module in the voltage acquisition circuit is used for being electrically connected with a neutral wire of the ac power supply, and the first resistor module in the voltage acquisition circuit is disposed between the first end of the current transformer module and the live wire of the ac power supply or between the fourth end of the current transformer module and the neutral wire of the ac power supply.
In a third aspect, embodiments of the present application provide an emergency lighting power supply, including the voltage acquisition system of the second aspect.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
the embodiment of the application provides a voltage acquisition circuit, which is applied to an emergency lighting power supply and comprises a first resistance module, a current transformer module and a second resistance module. The first end of the current transformer module is used for being electrically connected with a live wire of an alternating current power supply, the fourth end of the current transformer module is used for being electrically connected with a zero line of the alternating current power supply, the second end of the current transformer module is electrically connected with the first end of the second resistor module and the controller respectively, the third end of the current transformer module is electrically connected with the second end of the second resistor module and the controller respectively, and the first resistor module is arranged between the first end of the current transformer module and the live wire of the alternating current power supply or between the fourth end of the current transformer module and the zero line of the alternating current power supply.
Specifically, the first resistor module is used for generating a first current according to a voltage provided by the alternating current power supply, the first current flows through the current transformer module, the current transformer module is used for generating a second current according to the first current, the second current flows through the second resistor module, the controller is used for providing a reference voltage for the second resistor module, and the second resistor module is used for generating a first voltage according to the second current and the reference voltage and transmitting the first voltage to the controller. Wherein the first current is equal to the second current. The controller calculates the voltage provided by the alternating current power supply according to the first voltage and the reference voltage to be used as the basis of emergency lighting power supply fault alarm.
The embodiment of the application provides a voltage acquisition circuit which only adopts two resistance modules and one current transformer module, and the whole circuit has a simple structure and low cost, and solves the problems of complex structure and high cost of the existing mains voltage acquisition circuit.
It will be appreciated that the advantages of the second to third aspects may be found in the relevant description of the first aspect, and are not described in detail herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a voltage acquisition circuit according to an embodiment of the present application;
FIG. 2 is a functional block diagram of a voltage acquisition circuit provided in another embodiment of the present application;
FIG. 3 is a functional block diagram of a voltage acquisition circuit provided in another embodiment of the present application;
FIG. 4 is a schematic diagram of circuit connection of a voltage acquisition circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic block diagram of a voltage acquisition system according to an embodiment of the present application.
In the figure: 10. a voltage acquisition circuit; 11. a first resistor module; 12. a current transformer module; 13. a second resistor module; 14. a first filtering module; 15. a second filtering module; 16. a third filtering module; 17. a current limiting module; 20. a controller; 30. an alternating current power supply; 40. and a voltage acquisition system.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used in this specification and the appended claims, the term "if" may be interpreted in context as "when …" or "upon" or "in response to determining" or "in response to detecting". Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
In order to realize the fault alarm function of the emergency lighting power supply, the mains voltage needs to be monitored, and the mains voltage is monitored through a mains voltage acquisition circuit at present, but the structure of the current mains voltage acquisition circuit is complex and the cost is higher.
In order to solve the above-mentioned problems, the embodiment of the present application provides a voltage acquisition circuit applied to an emergency lighting power supply, and as shown in fig. 1, a voltage acquisition circuit 10 includes a first resistor module 11, a current transformer module 12 and a second resistor module 13. The first end of the current transformer module 12 is used for being electrically connected with the live wire L of the alternating current power supply 30, the fourth end of the current transformer module 12 is used for being electrically connected with the zero line N of the alternating current power supply 30, the second end of the current transformer module 12 is respectively electrically connected with the first end of the second resistor module 13 and the controller 20, and the third end of the current transformer module 12 is respectively electrically connected with the second end of the second resistor module 13 and the controller 20. Referring to fig. 1, the first resistance module 11 is disposed between the first end of the current transformer module 12 and the live line L of the ac power source 30, referring to fig. 2, or the first resistance module 11 is disposed between the fourth end of the current transformer module 12 and the neutral line N of the ac power source 30.
Specifically, the first resistor module 11 is configured to generate a first current according to a voltage provided by the ac power source 30, the first current flows through the current transformer module 12, the current transformer module 12 is configured to generate a second current according to the first current, the second current flows through the second resistor module 13, the controller 20 is configured to provide a reference voltage to the second resistor module 13, the second resistor module 13 is configured to generate a first voltage according to the second current and the reference voltage, and the first voltage is transmitted to the controller 20. Wherein the first current is equal to the second current, and the ac power source 30 is the commercial power. Since the first current is equal to the second current, the current transformer module 12 is primarily isolated. It should be noted that, the voltage at the first end of the second resistor module 13 is the first voltage, the voltage at the second end is the reference voltage, and in order to ensure accuracy of the calculation result, the controller 20 will collect the voltage at the second end of the second resistor module 13 during the actual data collection process.
The following specifically describes a process in which the controller 20 calculates the magnitude of the voltage supplied from the ac power source 30 based on the first voltage and the reference voltage: let the resistance value of the first resistor module 11 be R 11 The resistance value of the second resistor module 13 is R 13 V for the first voltage ADC Is expressed as V for reference voltage REF The voltage supplied by the AC power supply 30 is represented by V L-N Meaning that since the first current is equal to the second current, V can be derived L-N /R 11 ＝(V ADC -V REF )/R 13 The magnitude of the voltage supplied by the ac power supply 30 can be derived from this equation. It should be noted that, in the actual calculation process, to ensure the accuracy of the calculation result, the controller 20 will generate a first voltage V ADC And reference voltage V REF Processing, setting sampling period according to processing capacity, and collecting first voltage V in sampling period ADC And reference voltage V REF The more sampling points, the more accurate the data. In the embodiment of the application, the sampling period is set to be 1S, the sampling point number of each sampling period is 1000, and the sampling points are uniformly collected. The controller 20 will respond to the first voltage V ADC And reference voltage V REF Selecting a first voltage V ADC With reference voltage V REF A point where the difference of (2) is greater than 0, assuming a first voltage V ADC With reference voltage V REF Is used for the difference of V ADC-REF The expression is V ADC-REF ＝V ADC -V REF And V is ADC-REF > 0. During the sampling period, the controller 20 pairs the resulting V ADC-REF Adding and dividing by 2 times the sampling point number (2 times the sampling point number is needed because only half of the sine alternating current is sampled in the application), and obtaining the average valueBased on->V can be obtained L-N Is of a size of (a) and (b). And the alternating current is in sine wave change, and the final measured value V L-N ' and V L-N In a certain proportion, i.e. V L-N ’＝V L-N Alpha, alpha is a proportionality coefficient, and is generally 0.9. The first voltage V ADC Should be within the acquisition voltage range of the controller 20.
Exemplary, first voltage V ADC Is the reference voltage V REF Twice as many as (x).
For example, the controller 20 may be a control chip with an AD acquisition function, such as a single chip microcomputer, an FPGA (Field Programmable Gate Array ), or the like.
Illustratively, the first resistor module 11 includes a first resistor R1, the first resistor R1 being disposed between the fourth terminal of the current transformer module 12 and the neutral line N of the ac power source 30, referring to fig. 4. Or between the first end of the current transformer module 12 and the line L of the ac power source 30, not shown. Specifically, the first resistor R1 is used to generate a first current according to the voltage provided by the ac power source 30.
As shown in fig. 4, the second resistor module 13 includes a second resistor R2, wherein a first end of the second resistor R2 is electrically connected to a second end of the current transformer module 12 and the controller 20, and a second end of the second resistor R2 is electrically connected to a third end of the current transformer module 12 and the controller 20, respectively. Specifically, the second resistor R2 functions according to the second current and the reference voltage V REF Output a first voltage V to the controller 20 ADC . Wherein, the resistance values of the first resistor R1 and the second resistor R2 are matched to lead the first voltage V ADC Within the acquisition voltage range of the controller 20.
As shown in fig. 4, the current transformer 12 includes a current transformer T1, a first end of the current transformer T1 is electrically connected to a live wire L of the ac power source 30, a fourth end of the current transformer T1 is electrically connected to a neutral wire N of the ac power source 30, a second end of the current transformer T1 is electrically connected to a first end of the second resistor 13 and the controller 20, respectively, a third end of the current transformer T1 is electrically connected to a second end of the second resistor 13 and the controller 20, respectively, and the first resistor 11 is disposed between the first end of the current transformer T1 and the live wire L of the ac power source 30, not shown in the drawing, or between the fourth end of the current transformer T1 and the neutral wire N of the ac power source 30, referring to fig. 4. As can be seen from fig. 4, the second end of the current transformer T1 is electrically connected to the first end of the second resistor R2 and the controller 20, respectively, the third end of the current transformer T1 is electrically connected to the second end of the second resistor R2 and the controller 20, respectively, and the first resistor R1 is disposed between the fourth end of the current transformer T1 and the zero line N of the ac power supply 30. It should be noted that the first end of the current transformer T1 is the first end of the primary winding of the current transformer T1, the fourth end of the current transformer T1 is the second end of the primary winding of the current transformer T1, the second end of the current transformer T1 is the first end of the secondary winding of the current transformer T1, and the third end of the current transformer T1 is the second end of the secondary winding of the current transformer T1.
Specifically, the current transformer T1 is configured to make the first current equal to the second current and perform an isolating function, so the current transformer T1 may adopt 1: a small current transformer is used for realizing the functions.
As shown in fig. 3, the voltage acquisition circuit 10 provided in this embodiment of the present application further includes a first filter module 14, where a first end of the first filter module 14 is electrically connected to a first end of the current transformer module 12 and a live wire L of the ac power supply 30, a second end of the first filter module 14 is electrically connected to a fourth end of the current transformer module 12 and a neutral wire N of the ac power supply 30, and the first resistor module 11 is disposed between the first end of the current transformer module 12 and the first end of the first filter module 14, which is not shown in the drawing, or between the fourth end of the current transformer module 12 and the second end of the first filter module 14, referring to fig. 3. The first filtering module 14 is used for filtering the voltage provided by the ac power source 30.
Illustratively, as shown in fig. 4, the first filtering module 14 includes a first capacitor C1, wherein a first end of the first capacitor C1 is electrically connected to a first end of the current transformer module 12 and a live line L of the ac power source 30, respectively, and a second end of the first capacitor C1 is electrically connected to a fourth end of the current transformer module 12 and a neutral line N of the ac power source 30, respectively. The first resistor module 11 is disposed between a first end of the current transformer module 12 and a first end of the first capacitor C1, not shown in the drawing, or between a fourth end of the current transformer module 12 and a second end of the first capacitor C1, referring to fig. 4. As can be seen from fig. 4, the first end of the first capacitor C1 is electrically connected to the first end of the current transformer T1 and the live wire L of the ac power supply 30, the second end of the first capacitor C1 is electrically connected to the fourth end of the current transformer T1 and the neutral wire N of the ac power supply 30, and the first resistor R1 is disposed between the fourth end of the current transformer T1 and the second end of the first capacitor C1.
As shown in fig. 3, the voltage acquisition circuit 10 provided in the embodiment of the present application further includes a second filtering module 15, and the second filtering module 15 are electrically connected to the second end of the current transformer module 12, the first end of the second resistor module 13 and the controller 20, respectively. The second filter module 15 is used for generating a first voltage V for the second resistor module 13 ADC Filtering is performed.
As shown in fig. 4, the second filtering module 15 includes a second capacitor C2, where a first end of the second capacitor C2 is electrically connected to a second end of the current transformer module 12, a first end of the second resistor module 13, and the controller 20, and a second end of the second capacitor C2 is grounded. As can be seen from fig. 4, the first end of the second capacitor C2 is electrically connected to the second end of the current transformer T1, the first end of the second resistor R2, and the controller 20, respectively.
As shown in fig. 3, the voltage acquisition circuit 10 provided in the embodiment of the present application further includes a third filtering module 16, where the third filtering module 16 is electrically connected to the third end of the current transformer module 12, the second end of the second resistor module 13, and the controller 20, respectively. The third filtering module 16 is used for providing a reference voltage V to the controller 20 REF Filtering is performed.
As shown in fig. 4, the third filtering module 16 includes a third capacitor C3, and a first end of the third capacitor C3 is electrically connected to a third end of the current transformer module 12, a second end of the second resistor module 13, and the controller 20, respectively. The second end of the third capacitor C3 is grounded. As can be seen from fig. 4, the first end of the third capacitor C3 is electrically connected to the third end of the current transformer T1, the second end of the second resistor R2, and the controller 20, respectively.
As shown in fig. 3, the voltage acquisition circuit 10 provided in the embodiment of the present application further includes a current limiting module 17, where the current limiting module 17 is electrically connected to the second end of the current transformer module 12, the first end of the second resistor module 13, and the controller 20, respectively. The current limiting module 17 is used to limit the current flowing into the controller 20 so as not to burn out the controller 20 due to excessive current.
As shown in fig. 4, the current limiting module 17 includes a third resistor R3, wherein a first end of the third resistor R3 is electrically connected to a second end of the current transformer module 12 and a first end of the second resistor module 13, and a second end of the third resistor R3 is electrically connected to the controller 20. As can be seen from fig. 4, the first end of the third resistor R3 is electrically connected to the second end of the current transformer T1 and the first end of the second resistor R2, respectively.
The embodiment of the present application further provides a voltage acquisition system, as shown in fig. 5, where the voltage acquisition system 40 includes the controller 20 and the voltage acquisition circuit 10 described above. The second end of the current transformer module and the first end of the second resistor module in the voltage acquisition circuit 10 are electrically connected with the controller 20, the third end of the current transformer module and the second end of the second resistor module in the voltage acquisition circuit 10 are electrically connected with the controller 20, the first end of the current transformer module in the voltage acquisition circuit 10 is electrically connected with the live wire of the ac power supply 30, the fourth end of the current transformer module in the voltage acquisition circuit 10 is electrically connected with the zero wire of the ac power supply 30, and the first resistor module in the voltage acquisition circuit 10 is arranged between the first end of the current transformer module and the live wire of the ac power supply 30 or between the fourth end of the current transformer module and the zero wire of the ac power supply 30.
Specifically, the first resistor module in the voltage acquisition circuit 10 is configured to generate a first current according to the voltage provided by the ac power supply 30, the first current flows through the current transformer module in the voltage acquisition circuit 10, the current transformer module in the voltage acquisition circuit 10 is configured to generate a second current according to the first current, the second current flows through the second resistor module in the voltage acquisition circuit 10, the controller 20 is configured to provide a reference voltage to the second resistor module in the voltage acquisition circuit 10, the second resistor module in the voltage acquisition circuit 10 is configured to generate a first voltage according to the second current and the reference voltage, and the first voltage is transmitted to the controller 20, and the controller 20 calculates the magnitude of the voltage provided by the ac power supply 30 according to the reference voltage and the first voltage.
It can be seen from the above that the voltage acquisition system 40 provided in the embodiment of the present application only adopts two resistor modules, one current transformer module and one controller 20, and the whole circuit has a simple structure and low cost, so as to solve the problems of complex structure and high cost of the existing mains voltage acquisition circuit.
The embodiment of the application also provides an emergency lighting power supply, which comprises the voltage acquisition system. Because the emergency lighting power supply provided by the embodiment of the application comprises the voltage acquisition system, the emergency lighting power supply provided by the embodiment of the application has the advantages of simple circuit structure and low cost. The specific working principle is referred to the description of the working principle of the voltage acquisition system, and is not repeated herein.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The voltage acquisition circuit is applied to an emergency lighting power supply and is characterized by comprising a first resistor module, a current transformer module and a second resistor module, wherein a first end of the current transformer module is used for being electrically connected with a live wire of an alternating current power supply, a fourth end of the current transformer module is used for being electrically connected with a zero line of the alternating current power supply, a second end of the current transformer module is respectively and electrically connected with a first end of the second resistor module and a controller, a third end of the current transformer module is respectively and electrically connected with a second end of the second resistor module and the controller, and the first resistor module is arranged between the first end of the current transformer module and the live wire of the alternating current power supply or between the fourth end of the current transformer module and the zero line of the alternating current power supply;
the first resistor module is used for generating a first current according to the voltage provided by the alternating current power supply, the first current flows through the current transformer module, the current transformer module is used for generating a second current according to the first current, the second current flows through the second resistor module, the controller is used for providing a reference voltage for the second resistor module, and the second resistor module is used for generating a first voltage according to the second current and the reference voltage and transmitting the first voltage to the controller; wherein the first current is equal to the second current.
2. The voltage acquisition circuit of claim 1 wherein the first resistor module comprises a first resistor disposed between a first end of the current transformer module and a hot wire of the ac power source or between a fourth end of the current transformer module and a neutral wire of the ac power source.
3. The voltage acquisition circuit of claim 1 wherein the second resistor module comprises a second resistor, a first end of the second resistor being electrically connected to the second end of the current transformer module and the controller, respectively, and a second end of the second resistor being electrically connected to the third end of the current transformer module and the controller, respectively.
4. The voltage acquisition circuit of claim 1, wherein the current transformer module comprises a current transformer, a first end of the current transformer is used for being electrically connected with a live wire of the alternating current power supply, a fourth end of the current transformer is used for being electrically connected with a zero line of the alternating current power supply, a second end of the current transformer is respectively electrically connected with a first end of the second resistor module and the controller, a third end of the current transformer is respectively electrically connected with a second end of the second resistor module and the controller, and the first resistor module is arranged between the first end of the current transformer and the live wire of the alternating current power supply or between the fourth end of the current transformer and the zero line of the alternating current power supply.
5. The voltage acquisition circuit of any one of claims 1-4, further comprising a first filter module, a first end of the first filter module being electrically connected to the first end of the current transformer module and the line of the ac power source, respectively, a second end of the first filter module being electrically connected to the fourth end of the current transformer module and the neutral line of the ac power source, respectively, the first resistor module being disposed between the first end of the current transformer module and the first end of the first filter module or between the fourth end of the current transformer module and the second end of the first filter module.
6. The voltage acquisition circuit of any one of claims 1-4 further comprising a second filter module electrically connected to the second end of the current transformer module, the first end of the second resistor module, and the controller, respectively.
7. The voltage acquisition circuit of any one of claims 1-4 further comprising a third filter module electrically connected to the third end of the current transformer module, the second end of the second resistor module, and the controller, respectively.
8. The voltage acquisition circuit of any one of claims 1-4 further comprising a current limiting module electrically connected to the second end of the current transformer module, the first end of the second resistor module, and the controller, respectively.
9. A voltage acquisition system, comprising a controller and the voltage acquisition circuit according to any one of claims 1-8, wherein the second end of the current transformer module and the first end of the second resistor module in the voltage acquisition circuit are electrically connected with the controller, the third end of the current transformer module and the second end of the second resistor module in the voltage acquisition circuit are electrically connected with the controller, the first end of the current transformer module in the voltage acquisition circuit is electrically connected with a live wire of an ac power supply, the fourth end of the current transformer module in the voltage acquisition circuit is electrically connected with a neutral wire of the ac power supply, and the first resistor module in the voltage acquisition circuit is arranged between the first end of the current transformer module and the live wire of the ac power supply or between the fourth end of the current transformer module and the neutral wire of the ac power supply.
10. An emergency lighting power supply comprising the voltage acquisition system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322010445.5U CN220381196U (en) | 2023-07-27 | 2023-07-27 | Voltage acquisition circuit, system and emergency lighting power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322010445.5U CN220381196U (en) | 2023-07-27 | 2023-07-27 | Voltage acquisition circuit, system and emergency lighting power supply |
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| CN220381196U true CN220381196U (en) | 2024-01-23 |
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| CN202322010445.5U Active CN220381196U (en) | 2023-07-27 | 2023-07-27 | Voltage acquisition circuit, system and emergency lighting power supply |
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| CN (1) | CN220381196U (en) |
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2023
- 2023-07-27 CN CN202322010445.5U patent/CN220381196U/en active Active
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