CN219287370U - Electrical equipment and protection circuit thereof - Google Patents
Electrical equipment and protection circuit thereof Download PDFInfo
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- CN219287370U CN219287370U CN202223257261.0U CN202223257261U CN219287370U CN 219287370 U CN219287370 U CN 219287370U CN 202223257261 U CN202223257261 U CN 202223257261U CN 219287370 U CN219287370 U CN 219287370U
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- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 61
- 238000005070 sampling Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses electrical equipment and a protection circuit thereof. Wherein, the protection circuit of electrical equipment includes: the inverter circuit is connected with the electric load and is used for inverting the direct current into alternating current and supplying power for the electric load; the rectifier bridge circuit is connected with the inverter circuit and used for rectifying alternating current into direct current; the anti-interference circuit is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load, and the influence of the interference on the operation of the power utilization load can be avoided by eliminating the interference, so that the technical problem of poor operation stability of an electric appliance in the related technology can be solved.
Description
Technical Field
The application relates to the technical field of electric appliance control, in particular to electric equipment and a protection circuit thereof.
Background
The variable frequency air conditioner can generate interference in the use process, and the coping modes of partial manufacturers mainly comprise two modes, namely an active full-bridge treatment scheme and a passive treatment mode, and no matter which mode is used, the operation instability and even board burning can be caused by the fluctuation of the power grid quality and large interference in the use process.
Aiming at the technical problem of poor operation stability of the electric appliance in the related technology, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the application provides electrical equipment and a protection circuit thereof, so as to solve the technical problem of poor operation stability of an electrical appliance in the related technology.
To solve the above technical problem, according to an aspect of the embodiments of the present application, there is provided a protection circuit for an electrical device, including: the inverter circuit is connected with the electric load and is used for inverting the direct current into alternating current and supplying power for the electric load; the rectifier bridge circuit is connected with the inverter circuit and used for rectifying alternating current into direct current; and the anti-interference circuit is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load.
Optionally, the anti-interference circuit includes: the three-phase alternating current power supply comprises a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with a first phase of the three-phase alternating current power supply, one end of the second inductor is connected with a second phase of the three-phase alternating current power supply, and one end of the third inductor is connected with a third phase of the three-phase alternating current power supply; the first control sub-circuit, the second control sub-circuit and the third control sub-circuit, one end of the first control sub-circuit, one end of the third control sub-circuit and the other end of the first inductor are connected to a first node, the other end of the first control sub-circuit, one end of the second control sub-circuit and the other end of the second inductor are connected to a second node, and the other end of the second control sub-circuit, the other end of the third control sub-circuit and the other end of the third inductor are connected to a third node.
Optionally, the first control sub-circuit includes a first relay, a first capacitor, a second capacitor, and a first resistor, where one end of the first relay is connected to the first node, one end of the first capacitor and one end of the second capacitor are connected to the other end of the first relay, one end of the first resistor is connected to the other end of the second capacitor, and the other end of the first resistor and the other end of the first capacitor are connected to the second node; the second control sub-circuit comprises a second relay, a third capacitor, a fourth capacitor and a second resistor, one end of the second relay is connected with the second node, one end of the third capacitor and one end of the fourth capacitor are connected with the other end of the second relay, one end of the second resistor is connected with the other end of the fourth capacitor, and the other end of the second resistor and the other end of the third capacitor are connected with the third node; the third control sub-circuit comprises a third relay, a fifth capacitor, a sixth capacitor and a third resistor, one end of the third relay is connected with the first node, one end of the fifth capacitor and one end of the sixth capacitor are connected with the other end of the third relay, one end of the third resistor is connected with the other end of the sixth capacitor, and the other end of the third resistor and the other end of the fifth capacitor are connected with the third node.
Optionally, the protection circuit further includes: a voltage sampling circuit, the voltage sampling circuit comprising: one end of the fourth resistor and one end of the fifth resistor are connected to a fourth node, the other end of the fourth resistor and the inverter circuit are connected to a fifth node, and the other end of the fifth resistor and the inverter circuit are connected to a sixth node; and the control chip is respectively connected with the first relay, the second relay, the third relay and the fourth node and is used for determining the running state of the power utilization load according to the voltage of the fourth node so as to control the on-off of the first relay, the second relay and the third relay.
Optionally, the rectifier bridge circuit includes: the cathode of the first diode, the cathode of the second diode and the cathode of the third diode are connected with the fifth node, the anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode are connected with the sixth node, the anode of the first diode and the cathode of the fourth diode are connected with the first node, the anode of the second diode and the cathode of the fifth diode are connected with the second node, and the anode of the third diode and the cathode of the sixth diode are connected with the third node; and a seventh capacitor connected between the fifth node and the sixth node.
Optionally, in a case that the power load is in a standby state, the control chip is configured to output a low level to the first relay, the second relay, and the third relay to turn off the first relay, the second relay, and the third relay.
Optionally, the control chip is configured to output a high level to the first relay, the second relay, and the third relay to close the first relay, the second relay, and the third relay when the operating frequency of the electrical load is lower than a preset frequency or the operating load is lower than a first preset load.
Optionally, when the operation load of the electric load is higher than a second preset load, the control chip is configured to output a high level to the first relay, the second relay, and the third relay, so as to close the first relay, the second relay, and the third relay, where the second preset load is not less than the first preset load.
Optionally, in a case where the operation load of the electric load is changed from higher than a second preset load to lower than a first preset load or is in a shutdown process, the control chip is configured to output a low level to the first relay, the second relay, and the third relay to turn off the first relay, the second relay, and the third relay.
According to another aspect of the embodiment of the application, there is also provided an electrical apparatus, including the protection circuit of the electrical apparatus.
By applying the technical scheme of the application, the protection circuit of the electrical equipment comprises: the inverter circuit is connected with the electric load and is used for inverting the direct current into alternating current and supplying power for the electric load; the rectifier bridge circuit is connected with the inverter circuit and used for rectifying alternating current into direct current; the anti-interference circuit is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load, and the influence of the interference on the operation of the power utilization load can be avoided by eliminating the interference, so that the technical problem of poor operation stability of an electric appliance in the related technology can be solved.
Drawings
Fig. 1 is a schematic diagram of a protection circuit of an electrical device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, wherein it is apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present application to describe certain technical features, these technical features should not be limited to these terms. These terms are only used to distinguish one from another.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Example 1
The scheme can effectively solve the boosting problem by improving the circuit, and can reasonably switch the circuit under different loads, thereby ensuring the effective operation of the electric equipment such as an air conditioner and the like. According to an aspect of the embodiments of the present application, there is provided an embodiment of a protection circuit of an electrical device, as shown in fig. 1, the protection circuit including: an inverter circuit 11, a rectifier bridge circuit 12, and an anti-interference circuit 13.
The inverter circuit 11 is connected to an electric load for inverting the dc power into ac power to supply power to the electric load, and the electric load may be a compressor or the like.
The rectifier bridge circuit 12 is connected to the inverter circuit and rectifies the alternating current into direct current.
The rectifier bridge circuit may include: the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6, wherein the cathode of the first diode, the cathode of the second diode and the cathode of the third diode are connected with the fifth node J5, the anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode are connected with the sixth node J6, the anode of the first diode and the cathode of the fourth diode are connected with the first node J1, the anode of the second diode and the cathode of the fifth diode are connected with the second node J2, and the anode of the third diode and the cathode of the sixth diode are connected with the third node J3; and a seventh capacitor C7 connected between the fifth node and the sixth node.
The anti-interference circuit 13 is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load.
In the above embodiment, the tamper-proof circuit may include: the first inductor L1, the second inductor L2, and the third inductor L3, the first control sub-circuit, the second control sub-circuit, and the third control sub-circuit.
For the above-mentioned inductance, one end of the first inductance is connected with the first phase of the three-phase alternating current power supply, one end of the second inductance is connected with the second phase of the three-phase alternating current power supply, and one end of the third inductance is connected with the third phase of the three-phase alternating current power supply.
For the control sub-circuit, one end of the first control sub-circuit, one end of the third control sub-circuit and the other end of the first inductor are connected to the first node, the other end of the first control sub-circuit, one end of the second control sub-circuit and the other end of the second inductor are connected to the second node, and the other end of the second control sub-circuit, the other end of the third control sub-circuit and the other end of the third inductor are connected to the third node.
Optionally, the first control sub-circuit includes a first relay K1, a first capacitor C1, a second capacitor C2, and a first resistor R1, where one end of the first relay is connected to the first node, one end of the first capacitor and one end of the second capacitor are connected to the other end of the first relay, one end of the first resistor is connected to the other end of the second capacitor, and the other end of the first resistor and the other end of the first capacitor are connected to the second node.
Similarly, the second control sub-circuit comprises a second relay K2, a third capacitor C3, a fourth capacitor C4 and a second resistor R2, one end of the second relay is connected with a second node, one end of the third capacitor and one end of the fourth capacitor are connected with the other end of the second relay, one end of the second resistor is connected with the other end of the fourth capacitor, and the other end of the second resistor and the other end of the third capacitor are connected with the third node;
similarly, the third control sub-circuit includes a third relay K3, a fifth capacitor C5, a sixth capacitor C6, and a third resistor R3, one end of the third relay is connected to the first node, one end of the fifth capacitor and one end of the sixth capacitor are connected to the other end of the third relay, one end of the third resistor is connected to the other end of the sixth capacitor, and the other end of the third resistor and the other end of the fifth capacitor are connected to the third node.
In an embodiment of the present application, the protection circuit may further include: a voltage sampling circuit, the voltage sampling circuit comprising: the other end of the fourth resistor is connected with the inverter circuit to be connected with the fifth node, and the other end of the fifth resistor is connected with the inverter circuit to be connected with the sixth node; and the control chip DSP is respectively connected with the first relay, the second relay, the third relay and the fourth node and is used for determining the running state of the power load according to the voltage of the fourth node so as to control the on-off of the first relay, the second relay and the third relay.
In the above embodiment, the protection circuit includes, but is not limited to, the following operating states:
1) The control chip is used for outputting low level to the first relay, the second relay and the third relay under the condition that the electric load is in a standby state so as to disconnect the first relay, the second relay and the third relay;
2) In the case that the operation frequency of the electric load is lower than the preset frequency (i.e., low-frequency operation) or the operation load is lower than the first preset load (i.e., low-load operation), the control chip is used for outputting high levels to the first relay, the second relay and the third relay to close the first relay, the second relay and the third relay;
3) When the operation load of the electricity load is higher than a second preset load (namely, heavy load operation), the control chip is used for outputting high level to the first relay, the second relay and the third relay so as to close the first relay, the second relay and the third relay, wherein the second preset load is not smaller than the first preset load;
4) In the case that the operation load of the electric load is changed from higher than the second preset load to lower than the first preset load (i.e., switched from heavy load to light load), or is in the shutdown process, the control chip is configured to output a low level to the first relay, the second relay, and the third relay to turn off the first relay, the second relay, and the third relay.
In the technical scheme of this application, the protection circuit of electrical equipment includes: the inverter circuit is connected with the electric load and is used for inverting the direct current into alternating current and supplying power for the electric load; the rectifier bridge circuit is connected with the inverter circuit and used for rectifying alternating current into direct current; the anti-interference circuit is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load, and the influence of the interference on the operation of the power utilization load can be avoided by eliminating the interference, so that the technical problem of poor operation stability of an electric appliance in the related technology can be solved.
Example 2
As an alternative embodiment, the technical solution of the present application is further described in detail below in conjunction with fig. 1:
as shown in FIG. 1, L1-L3 are inductors, C1-C3 are X capacitors, C4-C6 are common absorption capacitors, K1-K3 are relays, R1-R3 are absorption resistors, and R4-R5 are voltage detection resistors.
The circuit core part consists of L1-L3, C1-C6, K1-K3, R1-R5, DSP and the like, wherein R4-R5 are rectified direct current bus sampling circuits, and sampled values are sent to the DSP. The DSP sends on and off signals to K1-K3 through the set IO port by setting a reasonable threshold value. In different working phases, the control mode is as follows:
1) During standby, K1-K3 is disconnected, L1-L3 is connected in series to the power input end, resonance cannot be formed with C1-C3, so that voltage at two ends of C7 is voltage after mains supply rectification, namely mains supply voltage is 1.414, and interference influence of an air conditioner on a power grid is minimum. At the moment, the pins connected with the DSP and the relays K1-K3 output low level, the relays K1-K3 are controlled by the chip to be disconnected, and the L1-L3 cannot form an LC closed loop with the C1-C3 connected in series, so that the voltage at the two ends of the C7 is not added.
2) When the compressor runs at low frequency or low load, L1-L3 are respectively connected in series in the three-phase input line, and according to the characteristics of the inductor, voltage drop can be generated when the current of the alternating current power supply flows through the inductor. At this time, if the voltage is lower than the set threshold, the DSP sends a high-level control signal to the K1-K3 through the IO port, the relays are all attracted, the L1-L3 and the C1-C3 generate resonance, and the bus voltage is correspondingly raised so as to meet the load change requirement. Because the capacitor connected with the relay in series is equivalent to short circuit at the closing moment of the relay, the current can be very large, and meanwhile, the voltage generated at the two ends of C1-C3 can be very high, so that the relay is stuck in an arc-discharging way, and a circuit system is damaged, so that the design of an effective elimination measure is very important. By designing an absorption loop at two ends of each capacitor of C1-C3, current and voltage peak values in the switching process of the relay can be effectively bypassed and absorbed, and effective operation of a circuit system is ensured.
3) When the compressor is operated again, K1-K3 is normally closed, L1-L3 and C1-C3 continuously generate resonance, so that the voltage is effectively increased, and the interference of an air conditioning system to an external power grid is reduced.
4) When the relay is switched from heavy load to light load or even is shut down, the relay is disconnected. Through the action of the circuit, the damage of partial components caused by abnormal rise of C7 due to the interference of an external power supply can be effectively avoided.
In the related technology, the voltage of a rear bus is increased due to interference, so that the reliability of components is threatened; when switching into the boost system, there are problems such as spike voltage and current. According to the technical scheme, the boost circuit for the electrical equipment such as the air conditioner is provided, the voltage boost circuit is automatically switched in and out of the voltage boost circuit by detecting the bus voltage in real time, and the switching can be automatically detected, so that the speed is high, special control is not needed, the tolerance of components can be improved, and the maintenance cost is reduced; the peak current and the peak voltage are effectively reduced, and the reliability of the device is ensured.
Example 3
According to another aspect of the embodiment of the present application, there is further provided an electrical apparatus, including the protection circuit of an electrical apparatus described above, and the specific implementation manner of the protection circuit refers to the foregoing embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; 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 corresponding technical solutions.
Claims (10)
1. A protection circuit for an electrical device, the protection circuit comprising:
the inverter circuit is connected with the electric load and is used for inverting the direct current into alternating current and supplying power for the electric load;
the rectifier bridge circuit is connected with the inverter circuit and used for rectifying alternating current into direct current;
and the anti-interference circuit is respectively connected with the rectifier bridge circuit and the three-phase alternating current power supply and is used for eliminating interference generated in the power utilization process of the power utilization load.
2. The protection circuit of claim 1, wherein the tamper-proof circuit comprises:
the three-phase alternating current power supply comprises a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with a first phase of the three-phase alternating current power supply, one end of the second inductor is connected with a second phase of the three-phase alternating current power supply, and one end of the third inductor is connected with a third phase of the three-phase alternating current power supply;
the first control sub-circuit, the second control sub-circuit and the third control sub-circuit, one end of the first control sub-circuit, one end of the third control sub-circuit and the other end of the first inductor are connected to a first node, the other end of the first control sub-circuit, one end of the second control sub-circuit and the other end of the second inductor are connected to a second node, and the other end of the second control sub-circuit, the other end of the third control sub-circuit and the other end of the third inductor are connected to a third node.
3. The protection circuit of claim 2, wherein,
the first control sub-circuit comprises a first relay, a first capacitor, a second capacitor and a first resistor, one end of the first relay is connected with the first node, one end of the first capacitor and one end of the second capacitor are connected with the other end of the first relay, one end of the first resistor is connected with the other end of the second capacitor, and the other end of the first resistor and the other end of the first capacitor are connected with the second node;
the second control sub-circuit comprises a second relay, a third capacitor, a fourth capacitor and a second resistor, one end of the second relay is connected with the second node, one end of the third capacitor and one end of the fourth capacitor are connected with the other end of the second relay, one end of the second resistor is connected with the other end of the fourth capacitor, and the other end of the second resistor and the other end of the third capacitor are connected with the third node;
the third control sub-circuit comprises a third relay, a fifth capacitor, a sixth capacitor and a third resistor, one end of the third relay is connected with the first node, one end of the fifth capacitor and one end of the sixth capacitor are connected with the other end of the third relay, one end of the third resistor is connected with the other end of the sixth capacitor, and the other end of the third resistor and the other end of the fifth capacitor are connected with the third node.
4. A protection circuit according to claim 3, wherein the protection circuit further comprises:
a voltage sampling circuit, the voltage sampling circuit comprising: one end of the fourth resistor and one end of the fifth resistor are connected to a fourth node, the other end of the fourth resistor and the inverter circuit are connected to a fifth node, and the other end of the fifth resistor and the inverter circuit are connected to a sixth node;
and the control chip is respectively connected with the first relay, the second relay, the third relay and the fourth node and is used for determining the running state of the power utilization load according to the voltage of the fourth node so as to control the on-off of the first relay, the second relay and the third relay.
5. The protection circuit of claim 4, wherein the rectifier bridge circuit comprises:
the cathode of the first diode, the cathode of the second diode and the cathode of the third diode are connected with the fifth node, the anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode are connected with the sixth node, the anode of the first diode and the cathode of the fourth diode are connected with the first node, the anode of the second diode and the cathode of the fifth diode are connected with the second node, and the anode of the third diode and the cathode of the sixth diode are connected with the third node;
and a seventh capacitor connected between the fifth node and the sixth node.
6. The protection circuit of claim 4, wherein,
and under the condition that the power utilization load is in a standby state, the control chip is used for outputting a low level to the first relay, the second relay and the third relay so as to disconnect the first relay, the second relay and the third relay.
7. The protection circuit of claim 4, wherein,
and under the condition that the operating frequency of the power utilization load is lower than a preset frequency or the operating load is lower than a first preset load, the control chip is used for outputting high level to the first relay, the second relay and the third relay so as to close the first relay, the second relay and the third relay.
8. The protection circuit of claim 4, wherein,
and under the condition that the operation load of the electricity load is higher than a second preset load, the control chip is used for outputting high level to the first relay, the second relay and the third relay so as to close the first relay, the second relay and the third relay.
9. The protection circuit of claim 4, wherein,
and under the condition that the operation load of the electricity load is changed from higher than a second preset load to lower than a first preset load or is in a shutdown process, the control chip is used for outputting a low level to the first relay, the second relay and the third relay so as to disconnect the first relay, the second relay and the third relay, wherein the second preset load is not smaller than the first preset load.
10. An electrical device comprising the protection circuit of the electrical device of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223257261.0U CN219287370U (en) | 2022-12-02 | 2022-12-02 | Electrical equipment and protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223257261.0U CN219287370U (en) | 2022-12-02 | 2022-12-02 | Electrical equipment and protection circuit thereof |
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| CN219287370U true CN219287370U (en) | 2023-06-30 |
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| CN202223257261.0U Active CN219287370U (en) | 2022-12-02 | 2022-12-02 | Electrical equipment and protection circuit thereof |
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| CN (1) | CN219287370U (en) |
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