CN213990114U - Safety protection device and electrical equipment - Google Patents
Safety protection device and electrical equipment Download PDFInfo
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- CN213990114U CN213990114U CN202022575685.6U CN202022575685U CN213990114U CN 213990114 U CN213990114 U CN 213990114U CN 202022575685 U CN202022575685 U CN 202022575685U CN 213990114 U CN213990114 U CN 213990114U
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Abstract
The present disclosure provides a safety protection device and an electrical apparatus. The safety protection device includes: the normally open switch is arranged on a line between the analog output circuit and the load terminal; a signal detection circuit configured to detect an electrical parameter value at a load terminal and send the electrical parameter value to the safety control circuit; a safety control circuit configured to provide a driving electrical signal to the switch control circuit in the event that the electrical parameter value is not greater than a preset threshold; a switch control circuit configured to control the normally open switch to close using the driving electrical signal. The method and the device can effectively avoid the damage of the recoil voltage or the recoil current generated at the load terminal to the electronic components in the analog output circuit.
Description
Technical Field
The disclosure relates to the field of control, in particular to a safety protection device and electrical equipment.
Background
In the related art, the analog output circuit may output a voltage signal of 0-10V or a current signal of 0-20mA, so that the load may normally operate by supplying the voltage signal or the current signal output by the analog output circuit to the external load.
SUMMERY OF THE UTILITY MODEL
The inventor finds that a relatively large kickback voltage or kickback current may be generated at the moment of plugging or powering up the external load. When the kickback voltage or the kickback current exceeds the range of the electronic components in the analog output circuit, the electronic components may be damaged. Thereby resulting in abnormal output of the analog output circuit and abnormal operation of the load.
Accordingly, the present disclosure provides a safety protection scheme capable of effectively protecting an analog output circuit.
According to a first aspect of the embodiments of the present disclosure, there is provided a safety protection device, including: the normally open switch is arranged on a line between the analog output circuit and the load terminal; a signal detection circuit configured to detect an electrical parameter value at the load terminal and send the electrical parameter value to a safety control circuit; the safety control circuit is configured to provide a driving electric signal to the switch control circuit under the condition that the electric parameter value is not greater than a preset threshold; a switch control circuit configured to control the normally open switch to close using the driving electrical signal.
In some embodiments, the safety control circuit is further configured to stop providing the driving electrical signal to the switch control circuit if the electrical parameter value is greater than a preset threshold.
In some embodiments, where the output signal of the analog output circuit is a voltage signal, the electrical parameter value is a voltage value; and when the output signal of the analog output circuit is a current signal, the electric parameter value is a current value.
In some embodiments, the signal detection circuit comprises: a selection circuit including an input terminal, a control terminal, and a first output terminal, the input terminal being electrically connected to the load terminal, the selection circuit providing an electrical signal received by the input terminal to the first output terminal in accordance with a first selection signal received by the control terminal and provided by the safety control circuit; a voltage detection sub-circuit configured to generate the voltage value from an electrical signal provided by the first output terminal and provide the voltage value to the safety control circuit.
In some embodiments, the voltage detection sub-circuit includes a first resistor and a second resistor, a first end of the first resistor is electrically connected to the first output terminal, a second end of the first resistor is electrically connected to the first end of the second resistor and the safety control circuit, respectively, a second end of the second resistor is grounded, and the voltage value is a voltage value at the second end of the first resistor.
In some embodiments, the selection circuit further comprises a second output terminal to which the selection circuit provides the electrical signal received by the input terminal in accordance with a second selection signal received by the control terminal and provided by the safety control circuit; the signal detection circuit further includes: a current detection sub-circuit electrically connected to the second output terminal and the safety control circuit, respectively, configured to generate the current value according to an electrical signal provided by the second output terminal and provide the current value to the safety control circuit.
In some embodiments, the current detection sub-circuit includes a third resistor, a first end of the third resistor is electrically connected to the second output terminal and the safety control circuit, respectively, a second end of the first resistor is grounded, and the current value is a current value at the first end of the first resistor.
In some embodiments, the switch control circuit includes a coil having a first end electrically connected to the safety control circuit and a second end applying a predetermined voltage value, wherein the coil controls the normally open switch to close if the safety control circuit provides the driving electrical signal.
In some embodiments, the safety control circuit is further configured to send an output control signal to the analog output circuit, so that the analog input circuit outputs a corresponding voltage signal or current signal according to the output control signal.
According to a second aspect of the embodiments of the present disclosure, there is provided an electric apparatus including: a safety shield apparatus as described in any of the above embodiments; an analog output circuit configured to output a voltage signal or a current signal according to an output control signal transmitted by the safety protection device, and a load terminal, wherein the safety protection device is disposed on a line between the analog output circuit and the load terminal.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a safety shield apparatus according to one embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a safety shield apparatus according to another embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a safety shield apparatus according to yet another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electrical device according to one embodiment of the present disclosure.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials and values set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.
The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
Fig. 1 is a schematic structural diagram of a safety protection device according to one embodiment of the present disclosure. As shown in fig. 1, the safety protection device includes a normally open switch 11, a signal detection circuit 12, a safety control circuit 13, and a switch control circuit 14.
A normally open switch 11 is provided on the line between the analog output circuit 1 and the load terminal 2.
The signal detection circuit 12 detects an electrical parameter value at the load terminal and sends the electrical parameter value to the safety control circuit 13.
In some embodiments, in the case where the output signal of the analog output circuit 1 is a voltage signal, the electrical parameter value is a voltage value. When the output signal of the analog output circuit 1 is a current signal, the electrical parameter value is a current value.
In some embodiments, the safety control circuit 13 sends an output control signal to the analog output circuit 1 so that the analog input circuit 1 outputs a corresponding voltage signal or current signal according to the output control signal. That is, the analog input circuit 1 outputs a corresponding voltage signal or current signal according to the control of the safety control circuit 13.
The safety control circuit 13 provides a driving electric signal to the switch control circuit 14 in case the value of the electric parameter is not greater than a preset threshold. The switch control circuit 14 controls the normally open switch 11 to be closed by using the driving electric signal. In this case, the load terminal 2 operates with a voltage signal or a current signal supplied from the analog output circuit 1.
In some embodiments, the safety control circuit 13 stops providing the driving electrical signal to the switch control circuit 14 in case the electrical parameter value is greater than a preset threshold. Since the switch control circuit 14 cannot control the normally open switch 11 to be closed without the driving electric signal, that is, the normally open switch 11 is restored to the open state. In this case, the line between the load terminal 2 and the analog output circuit 1 is in an open state.
In the safety protection device provided by the above embodiment of the present disclosure, the normally open switch is controlled to be closed when the electrical parameter value detected at the load terminal is not greater than the preset threshold, and the normally open switch is controlled to be opened when the electrical parameter value detected at the load terminal is greater than the preset threshold, so that damage to electronic components in the analog output circuit caused by the recoil voltage or the recoil current generated at the load terminal is effectively avoided.
Fig. 2 is a schematic structural diagram of a safety protection device according to another embodiment of the present disclosure. Fig. 2 differs from fig. 1 in that, in the embodiment shown in fig. 2, the signal detection circuit 12 includes a selection circuit 21, a voltage detection sub-circuit 22, and a current detection sub-circuit 23.
The selection circuit 21 includes an input terminal 211, a control terminal 212, a first output terminal 213, and a second output terminal 214. The input terminal 211 is electrically connected to the load terminal 1, and the selection circuit 21 supplies the electric signal received by the input terminal 211 to the first output terminal 213 in accordance with a first selection signal received by the control terminal 212 and supplied from the safety control circuit 13.
The voltage detection sub-circuit 22 generates a voltage value according to the electrical signal provided by the first output terminal 213 and provides the voltage value to the safety control circuit 13, so that the safety control circuit 13 provides a driving electrical signal to the switch control circuit 14 to control the normally-open switch 11 to close if the voltage value provided by the voltage detection sub-circuit 22 is not greater than a preset threshold.
In some embodiments, the selection circuit 21 provides the electrical signal received by the input terminal 211 to the second output terminal 214 according to a second selection signal received by the control terminal 212 and provided by the safety control circuit 13.
The current detection sub-circuit 23 is electrically connected to the second output terminal 214 and the safety control circuit 13, respectively. The current detection sub-circuit 23 generates a current value according to the electrical signal provided by the second output terminal 214 and provides the current value to the safety control circuit 13, so that the safety control circuit 13 provides a driving electrical signal to the switch control circuit 14 to control the normally open switch 11 to close under the condition that the current value provided by the current detection sub-circuit 23 is not more than a preset threshold.
Here, the selection circuit 21 is a multi-channel circuit. For example, if the safety control circuit 13 transmits a selection signal "10" to the control terminal 212 of the selection circuit 21, the selection circuit 21 supplies the electric signal received by the input terminal 211 to the first output terminal 213. When the safety control circuit 13 transmits a selection signal "01" to the control terminal 212 of the selection circuit 21, the selection circuit 21 supplies the electric signal received by the input terminal 211 to the second output terminal 214.
In some embodiments, as shown in fig. 2, the switch control circuit 14 includes a coil 141. A first end of the coil 141 is electrically connected to the safety control circuit 13, and a second end of the coil 141 is applied with a predetermined voltage value. The coil 141 generates a magnetic field in the case where the safety control circuit 13 supplies a driving electric signal, thereby controlling the normally open switch 11 to be closed by the action of the magnetic field.
Fig. 3 is a schematic structural diagram of a safety protection device according to yet another embodiment of the present disclosure. In the embodiment illustrated in fig. 3, a specific structure of the voltage detection sub-circuit 22 and the current detection sub-circuit 23 is given.
As shown in FIG. 3, the voltage detection subcircuit 22 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the first output terminal 213, the second end of the first resistor R2 is electrically connected to the first end of the second resistor R2 and the safety control circuit 13, the second end of the second resistor R2 is grounded, and the voltage value obtained by the voltage detection sub-circuit 22 is the voltage value at the second end of the first resistor R1.
The voltage value U is calculated using the following formula (1), for example.
U＝(R1/(R1+R2)×a×b)/c (1)
Wherein a, b and c are calculation parameters. For example, a is 10, b is 4095, and c is 5 (reference voltage of the safety control circuit 13).
In some embodiments, as shown in FIG. 3, a first capacitor C1 is also included in the voltage detection subcircuit 22. A first end of the first capacitor C1 is electrically connected with a first end of the second resistor R2, and a second end of the first capacitor C1 is electrically connected with a second end of the second resistor R2. The first capacitor C1 is provided to remove the influence of external interference on the voltage value.
In some embodiments, as shown in fig. 3, the current detection sub-circuit 23 includes a third resistor R3, a first end of the third resistor R3 is electrically connected to the second output terminal 214 and the safety control circuit 13, respectively, a second end of the first resistor R1 is grounded, and the current value obtained by the current detection sub-circuit 23 is the current value at the first end of the first resistor R1.
The voltage value I is calculated, for example, using the following formula (2).
I＝(d×R3×e)/f (1)
Wherein d, e and f are calculation parameters. For example, d is 20, e is 4095, and f is 5 (reference voltage of the safety control circuit 13).
In some embodiments, as shown in fig. 3, a second capacitor C2 is also included in the current detection subcircuit 23. The first end of the second capacitor C2 is electrically connected to the first end of the third resistor R3, and the second end of the second capacitor C2 is electrically connected to the second end of the third resistor R3. The second capacitor C2 is provided to remove the influence of external interference on the current value.
Fig. 4 is a schematic structural diagram of an electrical device according to one embodiment of the present disclosure. As shown in fig. 4, the electrical apparatus includes an analog output circuit 41, a safety protection device 42, and a load terminal 43. The safety protection device 42 is provided on a line between the analog output circuit 41 and the load terminal 43. The safety protection device 42 is the safety protection device according to any one of the embodiments of fig. 1 to 3.
The analog output circuit 41 outputs a voltage signal or a current signal according to an output control signal transmitted from the safety protection device 42.
In some embodiments, the switch control Circuit may be implemented as a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable Logic device, discrete Gate or transistor Logic, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.
So far, embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (10)
1. A safety arrangement, comprising:
the normally open switch is arranged on a line between the analog output circuit and the load terminal;
a signal detection circuit configured to detect an electrical parameter value at the load terminal and send the electrical parameter value to a safety control circuit;
the safety control circuit is configured to provide a driving electric signal to the switch control circuit under the condition that the electric parameter value is not greater than a preset threshold;
a switch control circuit configured to control the normally open switch to close using the driving electrical signal.
2. The apparatus of claim 1, wherein:
the safety control circuit is further configured to stop providing the driving electrical signal to the switch control circuit if the electrical parameter value is greater than a preset threshold.
3. The apparatus of claim 1, wherein:
under the condition that the output signal of the analog output circuit is a voltage signal, the electric parameter value is a voltage value;
and when the output signal of the analog output circuit is a current signal, the electric parameter value is a current value.
4. The apparatus of claim 3, wherein the signal detection circuit comprises:
a selection circuit including an input terminal, a control terminal, and a first output terminal, the input terminal being electrically connected to the load terminal, the selection circuit providing an electrical signal received by the input terminal to the first output terminal in accordance with a first selection signal received by the control terminal and provided by the safety control circuit;
a voltage detection sub-circuit configured to generate the voltage value from an electrical signal provided by the first output terminal and provide the voltage value to the safety control circuit.
5. The apparatus of claim 4, wherein:
the voltage detection sub-circuit comprises a first resistor and a second resistor, wherein a first end of the first resistor is electrically connected with the first output terminal, a second end of the first resistor is respectively electrically connected with a first end of the second resistor and the safety control circuit, a second end of the second resistor is grounded, and the voltage value is the voltage value at the second end of the first resistor.
6. The apparatus of claim 5, wherein:
the selection circuit further comprises a second output terminal to which the selection circuit provides the electrical signal received by the input terminal in accordance with a second selection signal received by the control terminal and provided by the safety control circuit;
the signal detection circuit further includes:
a current detection sub-circuit electrically connected to the second output terminal and the safety control circuit, respectively, configured to generate the current value according to an electrical signal provided by the second output terminal and provide the current value to the safety control circuit.
7. The apparatus of claim 6, wherein:
the current detection sub-circuit comprises a third resistor, the first end of the third resistor is electrically connected with the second output terminal and the safety control circuit respectively, the second end of the first resistor is grounded, and the current value is the current value at the first end of the first resistor.
8. The apparatus of claim 1, wherein:
the switch control circuit comprises a coil, wherein a first end of the coil is electrically connected with the safety control circuit, a second end of the coil applies a preset voltage value, and the coil controls the normally open switch to be closed under the condition that the safety control circuit provides the driving electric signal.
9. The apparatus according to any one of claims 1-8, wherein:
the safety control circuit is further configured to send an output control signal to the analog output circuit so that the analog output circuit outputs a corresponding voltage signal or current signal according to the output control signal.
10. An electrical device, comprising:
the safety protection device of any one of claims 1-9;
an analog output circuit configured to output a voltage signal or a current signal according to an output control signal transmitted from the safety protection device, an
A load terminal, wherein the safety protection device is disposed on a line between the analog output circuit and the load terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022575685.6U CN213990114U (en) | 2020-11-09 | 2020-11-09 | Safety protection device and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022575685.6U CN213990114U (en) | 2020-11-09 | 2020-11-09 | Safety protection device and electrical equipment |
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| Publication Number | Publication Date |
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| CN213990114U true CN213990114U (en) | 2021-08-17 |
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| CN202022575685.6U Active CN213990114U (en) | 2020-11-09 | 2020-11-09 | Safety protection device and electrical equipment |
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| CN (1) | CN213990114U (en) |
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