CN214228219U - High-voltage electric pulse circuit of ammeter and ammeter - Google Patents
High-voltage electric pulse circuit of ammeter and ammeter Download PDFInfo
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- CN214228219U CN214228219U CN202120443759.2U CN202120443759U CN214228219U CN 214228219 U CN214228219 U CN 214228219U CN 202120443759 U CN202120443759 U CN 202120443759U CN 214228219 U CN214228219 U CN 214228219U
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Abstract
The application relates to a high-voltage electric pulse circuit of an electric meter and the electric meter. The electric pulse circuit of the electric meter comprises a control circuit, a drive circuit, a switch circuit and a pulse output circuit. The control circuit is used for outputting a pulse control signal; the driving circuit is connected with the control circuit and used for receiving the pulse control signal and outputting a switch control signal according to the pulse control signal; the switch circuit is connected with the power supply in series and connected with the output end of the driving circuit, and the switch circuit is switched on and off according to the switch control signal so that the output end of the switch circuit outputs a pulse signal; the pulse output circuit is connected in series with the output end of the switch circuit and used for driving the external equipment to measure the accuracy of the ammeter. The application provides an electric pulse circuit for an electric meter, which is mainly characterized by being used in high-voltage special occasions and improving the working safety of the electric pulse circuit.
Description
Technical Field
The application relates to the field of electric meters, in particular to a high-voltage electric pulse circuit of an electric meter and the electric meter.
Background
The electric pulse circuit can be applied to the intelligent electric meter so as to detect the precision of the intelligent electric meter. In the related technology, the electric pulse circuit can only be externally connected with a low-voltage direct-current power supply, and if the high-voltage power supply is connected, the electric pulse circuit is burnt, so that the conventional electric pulse circuit cannot meet the application requirement of only the high-voltage power supply in special occasions.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
It is an object of the present application to provide an electric meter pulse circuit for high voltage applications and to improve its safety in operation at high voltages.
In order to solve the technical problem, the following technical scheme is adopted in the application:
according to one aspect of the present application, there is provided a high voltage electrical pulse circuit for an electrical meter, comprising:
the control circuit is used for outputting a pulse control signal;
the driving circuit is connected with the control circuit and used for receiving the pulse control signal and outputting a switch control signal according to the pulse control signal;
the switch circuit is connected with the power supply in series and connected with the output end of the driving circuit, and the switch circuit is switched on and off according to the switch control signal so that the output end of the switch circuit outputs a pulse signal;
and the pulse output circuit is connected in series with the output end of the switch circuit so as to reduce the voltage of the pulse signal output by the pulse output circuit.
According to an embodiment of the present application, the driving circuit includes a first switching tube, a first resistor, and a second resistor;
the controlled end of the first switch tube is connected with the first end of the second resistor, the first end of the first switch tube is used for outputting the switch control signal, and the second end of the first switch tube is grounded;
the second end of the second resistor is connected with the control circuit to receive the pulse control signal, the second end of the second resistor is connected with the first end of the first resistor, and the second end of the first resistor is grounded.
According to an embodiment of the application, the switch circuit comprises an optical coupler and a power supply; the optical coupler comprises a light emitter and a light receiver, the first end of the light emitter is connected with the power supply, and the second end of the light emitter is connected with the first end of the first switch tube; and the first end of the light receiver is connected with the pulse output circuit, and the second end of the light receiver is connected with the power supply.
According to an embodiment of the present application, the light emitter is a light emitting diode, the first end of the light emitter is an anode of the light emitting diode, and the second end of the light emitter is a cathode of the light emitting diode.
According to an embodiment of the application, the light receiver is a photosensitive semiconductor tube, a controlled end of the photosensitive semiconductor tube is used for receiving an optical signal sent by the light emitter, a first end of the photosensitive semiconductor tube is connected with the pulse output circuit, and a second end of the photosensitive semiconductor tube is used for connecting the power supply.
According to an embodiment of the present application, the pulse output circuit includes at least one step-down resistor; the at least one voltage dropping resistor is connected in series or in parallel.
According to an embodiment of the present application, the step-down resistor is a PTC resistor.
According to an embodiment of the present application, the pulse output circuit further includes a resistance value adjusting circuit, and the resistance value adjusting circuit is connected in parallel with at least one of the step-down resistors;
the resistance value adjusting circuit comprises a control switch, and the control switch is turned on/off to adjust the resistance value of the pulse output circuit.
According to an embodiment of the application, the output end of the pulse output circuit is connected with a connecting terminal, and the connecting terminal is used for external equipment and/or power supply connection.
The embodiment of the application further provides an ammeter, which comprises the ammeter high-voltage pulse circuit.
The utility model discloses in the scheme, ammeter pulse output circuit can connect high voltage power supply to export high-voltage pulse under drive circuit's control through switch circuit, so that be applied to the precision measurement under the special occasion of high pressure. In addition, the scheme of the utility model can reduce the voltage of the pulse signal output by the pulse output circuit by arranging the pulse output circuit, thereby preventing the circuit from being damaged due to the access of a high-voltage power supply to the circuit; of course, the utility model discloses the scheme also can prevent that high voltage power supply from inserting the circuit by mistake and leading to electric pulse circuit's damage, has improved electric pulse circuit's work security.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a circuit block diagram illustrating an electric pulse circuit of an electric meter according to an embodiment.
Fig. 2 is a circuit diagram of a high-voltage electrical pulse circuit of an electricity meter according to an embodiment.
Fig. 3 is a circuit configuration diagram illustrating connection of a high-voltage electric pulse circuit of an electric meter to an external device and a power supply according to an embodiment.
Fig. 4 is a circuit configuration diagram illustrating the connection of a high voltage electrical pulse circuit of an electricity meter to a power source, according to one embodiment.
The reference numerals are explained below:
100. a high voltage electrical pulse circuit; 10. a control circuit; 20. a drive circuit; 30. a switching circuit; 40. A pulse output circuit; 200. a power source; 300. and (4) an external device.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.
Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
The preferred embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the present specification.
The utility model provides an ammeter, this ammeter include high-voltage electric pulse circuit, and high-voltage electric pulse circuit is used for exporting the voltage or the electric current of pulse form, and external equipment can be connected to high-voltage electric pulse circuit's output, and high-voltage electric pulse circuit is used for driving external equipment, and needs carry out the partial pressure to external equipment. Therefore, by increasing the voltage of the power supply, effective driving of the external device can be ensured, but if the voltage is too high, the high-voltage electric pulse circuit is lost. Here, the external device may be a pulse acquisition device.
Fig. 1 is a circuit block diagram of a high-voltage electrical pulse circuit of an electricity meter according to an embodiment. The scheme allows the high-voltage electric pulse circuit to be directly connected to a power supply voltage which is greater than or equal to 230 Vac. Specifically, in one embodiment, the high-voltage electrical pulse circuit 100 includes a control circuit 10, a driving circuit 20, a switching circuit 30, and a pulse output circuit 40. The control circuit 10 is used for outputting a pulse control signal; the driving circuit 20 is connected to the control circuit 10, and the driving circuit 20 is configured to receive the pulse control signal and output a switch control signal according to the pulse control signal; the switch circuit 30 is connected in series with the power supply 200, the switch circuit 30 is connected with the output end of the driving circuit 20, and the switch circuit 30 performs on-off switching according to the switch control signal, so that the output end of the switch circuit 30 outputs a pulse signal; the pulse output circuit 40 is connected in series to the output end of the switch circuit 30 to reduce the voltage of the pulse signal output by the pulse output circuit 40.
The control circuit 10 may be a main control chip of the electric meter, such as an MCU, a CPU, or an SOC. When it is desired to send out a high voltage pulse, the control circuit 10 generates a pulse control signal.
The power supply 200 in series with the switching circuit 30 may be an external power supply 200, the voltage of the power supply 200 being allowed to be greater than 230 Vac.
Fig. 2 is a circuit diagram of a high-voltage electrical pulse circuit of an electricity meter according to an embodiment.
In one embodiment, the driving circuit 20 includes a first switch Q1, a first resistor R1, a second resistor R2; a controlled end of the first switch tube Q1 is connected to a first end of a second resistor R2, a first end of the first switch tube Q1 is used for outputting the switch control signal, and a second end of the first switch tube Q1 is grounded; a second terminal of the second resistor R2 is connected to the control circuit 10 for receiving the pulse control signal, a second terminal of the second resistor R2 is connected to the first terminal of the first resistor R1, and a second terminal of the first resistor R1 is grounded.
Here, the first switching tube Q1 may be a transistor, a MOS tube, or the like. Take a triode as an example. The controlled terminal is a base electrode of the triode, the second terminal is an emitting electrode of the triode, and the third terminal is a collector electrode of the triode.
The first resistor R1 can be used to protect the base of the transistor. The second resistor R2 can accelerate the bleeding of the circuit in the transistor during the transistor segment. Here, a plurality of the first resistor R1 and the second resistor R2 may be provided.
In one embodiment, the switch circuit 30 includes an optical coupler U1, a power supply 200; the rated voltage of the optical coupler is greater than or equal to 300V. The optical coupler U1 comprises a light emitter and a light receiver, wherein a first end of the light emitter is connected with a power supply 200, and a second end of the light emitter is connected with a first end of the first switching tube Q1 through a third resistor R3; the first end of the light receiver is connected to the pulse output circuit 40, and the second end of the light receiver is connected to the power supply 200. Here, the specific structure of the optical coupler U1 may be various, and in a specific example, the light emitter is a light emitting diode, the first end of the light emitter is an anode of the light emitting diode, and the second end of the light emitter is a cathode of the light emitting diode. The light receiver is a photosensitive transistor, the controlled end of the photosensitive transistor is used for receiving the optical signal sent by the light emitter, the first end of the photosensitive transistor is connected with the pulse output circuit 40, and the second end of the photosensitive transistor is connected with the power supply 200. Specifically, the photosensitive semiconductor transistor may be a phototriode, a photosensitive MOS transistor, or the like.
Taking the circuit shown in fig. 2 as an example, when the pulse control signal is at a high level, the first transistor is turned on, the first end of the first transistor is grounded, and at this time, the light emitting diode of the optocoupler U1 is turned on to emit a light signal. The controlled end of the photosensitive transistor senses the optical signal, so that the first end and the second end of the photosensitive transistor are conducted, and the output voltage of the first end of the photosensitive transistor is approximately the voltage of the power supply 200.
When the pulse control signal is at a low level, the first triode section and the first end of the first triode are in a high-impedance state, and at the moment, the light emitting diode of the optocoupler U1 is turned off to stop emitting the light signal. The controlled end of the photosensitive semiconductor tube can not sense optical signals, so that the first end and the second end of the photosensitive semiconductor tube are disconnected, and the output voltage of the first end of the photosensitive semiconductor tube is approximately 0; thus, a pulse voltage or a pulse current is generated at the output terminal of the pulse output circuit 40 by the pulse control of the pulse control signal.
The pulse control signal may be a signal with a certain period or a signal according to a certain rule or law. As mentioned above, the output of the high-voltage electrical pulse circuit 100 is also a periodic signal, or a signal according to a certain rule or law, depending on the actual use requirement of the user.
In this embodiment, the switching circuit 30 can not only realize the function of switching, but also realize the function of isolating, thereby effectively protecting the driving circuit 20 and the control circuit 10, and preventing the damage of the front-end control circuit 10 and the driving circuit 20 caused by the rear ends of the switching circuit 30 and the switching circuit 30 failing due to the excessive voltage. In this embodiment, a high voltage and high current optocoupler U1 may be used. Such as an optocoupler U1 with the specification of 400V/100mA and 600V/200 mA.
It should be understood that in another embodiment, the switching circuit 30 may also use a switch tube to implement the switching function.
In one embodiment, the pulse output circuit comprises at least one voltage reduction resistor RT 1; the at least one step-down resistor RT1 is connected in series or in parallel. The voltage reduction capability of the voltage reduction device can be improved by serially connecting the voltage reduction resistors RT1, and the voltage reduction reliability of the pulse output circuit 40 can be improved by parallelly connecting the voltage reduction resistors RT 1.
The voltage reduction resistor RT1 can be a high-power wire-wound resistor or a PTC resistor. The step-down resistor RT1 may be provided as a PTC resistor in consideration of space limitations. The PTC resistor has a characteristic of increasing resistance value with temperature rise, and when the PTC resistor is directly connected to a high-voltage power supply (for example, a power supply larger than 230 Vac), the heating resistance value is rapidly increased, so as to prevent the switching circuit 30 from being directly connected to a power supply with higher voltage to cause device damage.
Here, a plurality of PTC resistors may be selected to be connected in series. Fig. 3 is a circuit configuration diagram illustrating connection of the high-voltage electric pulse circuit 100 of the electric meter with the external device 300 and the power supply 200 according to an embodiment. In practical applications, the equivalent impedance of the external device 300 is 40k Ω, which requires the voltage division of the external device 300 to be greater than 180Vac, and the high-voltage electrical pulse circuit 100 is not damaged when the external device is directly connected to the 230Vac power supply 200. An optocoupler U1 with the specification of 400V/300mA is selected, the resistance value of the PTC resistors is selected to be 2K omega multiplied by 2, and the two PTC resistors are connected in series.
In one embodiment, the pulse output circuit 100 further includes a resistance value adjusting circuit, which is connected in parallel with at least one of the resistors; the resistance value adjusting circuit comprises a control switch which is controlled by switching on/off to adjust the resistance value of the pulse output circuit
Illustratively, the pulse output circuit 100 includes 3 step-down resistors RT1 connected in series, and the resistance value adjusting circuit is connected in parallel with one of the step-down resistors RT1, and when the pulse output circuit needs a small voltage reduction amount, the resistance value adjusting circuit is turned on to short-circuit the corresponding step-down resistor RT1, thereby reducing the resistance of the pulse output circuit.
The on/off of the resistance value adjusting circuit can be controlled by a switch tube, and the switch tube can be controlled by the control circuit 10.
In one embodiment, the output terminal of the pulse output circuit 40 is connected with a connection terminal, and the connection terminal is connected with an external device 300 or a power supply 200.
Please continue to refer to fig. 3 and 4. In one application, the connection terminal can be used for connecting the external device 300, and the power supply 200 is connected between the connection terminal and the external device 300. At this time, the pulse output circuit 40 outputs a pulse voltage.
Please continue to refer to fig. 4. In another application, the connection terminal is connected to the power supply 200, and the pulse output circuit 40 outputs a pulse current.
In the present embodiment, the switch circuit 30 can be connected to the high voltage power supply 200, so that the switch circuit 30 outputs the high voltage pulse under the control of the driving circuit 20; the high voltage pulse can improve the driving capability to the external device 300. In addition, the scheme of the utility model can reduce the voltage of the pulse signal output by the pulse output circuit 40 by arranging the pulse output circuit 40, thereby preventing the circuit from being damaged when the high-voltage power supply 200 is connected into the circuit; of course, the utility model discloses the scheme also can prevent that high voltage power supply 200 from mistakenly accessing the circuit and leading to high-voltage electric pulse circuit 100's damage, has improved high-voltage electric pulse circuit 100's work security nature.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A high-voltage electrical pulse circuit for an electrical meter, the high-voltage electrical pulse circuit comprising:
the control circuit is used for outputting a pulse control signal;
the driving circuit is connected with the control circuit and used for receiving the pulse control signal and outputting a switch control signal according to the pulse control signal;
the switch circuit is connected with the power supply in series and connected with the output end of the driving circuit, and the switch circuit is switched on and off according to the switch control signal so that the output end of the switch circuit outputs a pulse signal;
and the pulse output circuit is connected in series with the output end of the switch circuit so as to reduce the voltage of the pulse signal output by the pulse output circuit.
2. The high-voltage electric pulse circuit of an electric meter according to claim 1, wherein the driving circuit comprises a first switching tube, a first resistor, a second resistor;
the controlled end of the first switch tube is connected with the first end of the second resistor, the first end of the first switch tube is used for outputting the switch control signal, and the second end of the first switch tube is grounded;
the second end of the second resistor is connected with the control circuit to receive the pulse control signal, the second end of the second resistor is connected with the first end of the first resistor, and the second end of the first resistor is grounded.
3. The high-voltage electric pulse circuit of an electric meter according to claim 2, wherein the switching circuit comprises an optical coupler, a power supply source; the optical coupler comprises a light emitter and a light receiver, the first end of the light emitter is connected with the power supply, and the second end of the light emitter is connected with the first end of the first switch tube;
and the first end of the light receiver is connected with the pulse output circuit, and the second end of the light receiver is connected with the power supply.
4. The high-voltage electric pulse circuit of an electricity meter of claim 3, wherein the light emitter is a light emitting diode, the first end of the light emitter is an anode of the light emitting diode, and the second end of the light emitter is a cathode of the light emitting diode.
5. The high-voltage electric pulse circuit of an electric meter as claimed in claim 3, wherein the light receiver is a photosensitive transistor, a controlled end of the photosensitive transistor is used for receiving the optical signal emitted by the light emitter, a first end of the photosensitive transistor is connected to the pulse output circuit, and a second end of the photosensitive transistor is connected to the power supply.
6. The high-voltage electric pulse circuit of an electric meter according to any one of claims 1 to 5, wherein the pulse output circuit comprises at least one step-down resistor; the at least one voltage dropping resistor is connected in series or in parallel.
7. The high-voltage electric pulse circuit of an electricity meter according to claim 6, wherein the step-down resistor is a PTC resistor.
8. The high-voltage electric pulse circuit of an electric meter according to claim 7, wherein the pulse output circuit further comprises a resistance value adjusting circuit connected in parallel with at least one of the step-down resistors;
the resistance value adjusting circuit comprises a control switch, and the control switch is turned on/off to adjust the resistance value of the pulse output circuit.
9. The high-voltage electric pulse circuit of an electric meter according to claim 1, wherein a connection terminal is connected to an output terminal of the pulse output circuit, and the connection terminal is used for connecting an external device and/or the power supply.
10. An electricity meter comprising a high voltage pulse circuit of the electricity meter of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443759.2U CN214228219U (en) | 2021-03-01 | 2021-03-01 | High-voltage electric pulse circuit of ammeter and ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443759.2U CN214228219U (en) | 2021-03-01 | 2021-03-01 | High-voltage electric pulse circuit of ammeter and ammeter |
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| Publication Number | Publication Date |
|---|---|
| CN214228219U true CN214228219U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120443759.2U Active CN214228219U (en) | 2021-03-01 | 2021-03-01 | High-voltage electric pulse circuit of ammeter and ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114900157A (en) * | 2022-07-12 | 2022-08-12 | 深圳迈微医疗科技有限公司 | Pulse generating circuit, pulse generator and medical equipment |
-
2021
- 2021-03-01 CN CN202120443759.2U patent/CN214228219U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114900157A (en) * | 2022-07-12 | 2022-08-12 | 深圳迈微医疗科技有限公司 | Pulse generating circuit, pulse generator and medical equipment |
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Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. Address before: 611731 no.1218, Hezuo Road, high tech Zone (West District), Chengdu, Sichuan Province Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |
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Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: Chengdu Great Wall Development Technology Co., Ltd. Address before: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |
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