CN212695050U - Solid-state circuit breaker - Google Patents
Solid-state circuit breaker Download PDFInfo
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- CN212695050U CN212695050U CN202021905252.6U CN202021905252U CN212695050U CN 212695050 U CN212695050 U CN 212695050U CN 202021905252 U CN202021905252 U CN 202021905252U CN 212695050 U CN212695050 U CN 212695050U
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Abstract
A solid state circuit breaker comprising a mechanical switch, power electronics and a control circuit; the mechanical switch can be triggered manually or electrically, the mechanical switch comprises a contact mechanism and a control coil, the contact mechanism comprises a main contact and an auxiliary contact, the main contact and a power electronic device are connected in series on a main circuit of the circuit breaker and used for controlling the on-off of the main circuit of the circuit breaker, the control circuit is connected with the auxiliary contact and used for detecting the state of the auxiliary contact, the control circuit is connected with the power electronic device and used for driving the power electronic device to act, and the control circuit can drive the contact mechanism to act through the control coil. When the control circuit is normally powered, the mechanical switch can be triggered manually or electrically, so that the contact mechanism and the power electronic device act to operate the on-off of the main line, and when the power supply of the control circuit is interrupted, the mechanical switch can only be triggered manually. When the control circuit is interrupted to supply power, the mechanical switch can still be triggered manually, and the defect that the conventional solid-state circuit breaker cannot be switched on after power failure is overcome.
Description
Technical Field
The utility model relates to a circuit breaker, concretely relates to solid state circuit breaker.
Background
The solid-state circuit breaker is more and more widely applied to a flexible alternating current transmission system due to the fact that the solid-state circuit breaker has quick on-off performance, reliability and repeated operability, and the stability and the reliability of a power system are greatly improved through cooperation with other devices. However, the existing solid-state circuit breaker cannot be completely separated from the mechanical switch, the solid-state circuit breaker usually needs to be equipped with the mechanical switch as electrical isolation, leakage current generated by a power electronic device can be avoided by disconnecting the mechanical switch, the circuit of the type usually controls the mechanical switch and the power electronic device to be switched on and off through time offset, but the mechanical switch is complex in action process and usually cannot precisely act like the power electronic device, and the mechanical switch is controlled by an electronic circuit in the solid-state circuit breaker to be switched on and off, so that the solid-state circuit breaker cannot operate when a system needs to be switched on when the system is powered off, and the solid-state circuit breaker has use limitation.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a can overcome current operation defect's solid-state circuit breaker and control method thereof.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a solid state circuit breaker comprising a mechanical switch, power electronics and a control circuit; the mechanical switch can be triggered manually or electrically, the mechanical switch comprises a contact mechanism and a control coil capable of driving the contact mechanism to act, the contact mechanism comprises a main contact and an auxiliary contact, the main contact and a power electronic device are connected in series on a main circuit of the circuit breaker and used for controlling the on-off of the main circuit of the circuit breaker, a control circuit is connected with the auxiliary contact and used for detecting the state of the auxiliary contact, the control circuit is connected with the power electronic device and used for driving the power electronic device to act, and the control circuit can drive the contact mechanism to act through the control coil.
Preferably, when the mechanical switch is triggered to close manually or electrically, the main contact is closed before the auxiliary contact; when the mechanical switch is triggered to be opened manually or electrically, the auxiliary contact is opened before the main contact.
Preferably, the main contact, the auxiliary contact and the control coil are assembled together, the total stroke of the main contact is the same as that of the auxiliary contact, the opening distance of the main contact is smaller than that of the auxiliary contact, and the overtravel of the main contact is larger than that of the auxiliary contact.
Preferably, when the mechanical switch is manually triggered to be closed, the main contact is closed before the auxiliary contact, and the control circuit controls the conduction of the power electronic device after detecting the closing of the auxiliary contact; when the mechanical switch is triggered to be disconnected manually, the auxiliary contact is disconnected before the main contact, and the control circuit controls the power electronic device to be closed before the main contact is disconnected after detecting that the auxiliary contact is disconnected.
Preferably, the control circuit takes power from a power supply system of the circuit breaker, and the mechanical switch is of a magnetic holding structure or a self-holding structure.
Preferably, the control circuit is provided with a power supply, and the mechanical switch is an electric holding structure.
The utility model discloses a solid-state circuit breaker sets up the mechanical switch that can be triggered by manual or electronic in solid-state circuit breaker, when the control circuit of solid-state circuit breaker was interrupted the power supply, can realize mechanical switch's disconnection and closure through manual trigger mechanical switch, still can normally drive mechanical switch after the control circuit resumes the power supply, overcome the defect that current solid-state circuit breaker can not close a floodgate after the outage.
In addition, compare the current solid state circuit breaker that shuts off through mechanical structure, the utility model discloses at the disconnection of assisting the contact, when the main contact did not break off completely, realize the shutoff to the major loop through the disconnection of drive power electronics, it is fast to have the shutoff, advantage that the reaction is sensitive.
In addition, the control circuit in the solid-state circuit breaker can directly get electricity from a power supply system of the circuit breaker and can also be provided with a power supply source, and the application range is wide.
Drawings
Fig. 1 is a schematic diagram of a solid-state circuit breaker according to the present invention.
Detailed Description
The following describes a specific embodiment of a solid-state circuit breaker and a control method thereof according to the present invention with reference to the embodiment shown in fig. 1. The present invention is not limited to the description of the following embodiments.
A solid state circuit breaker comprising a mechanical switch, power electronics and a control circuit; the mechanical switch can be triggered manually or electrically, the mechanical switch comprises a contact mechanism and a control coil capable of driving the contact mechanism to act, the contact mechanism comprises a main contact and an auxiliary contact, the main contact and a power electronic device are connected in series on a main circuit of the circuit breaker and used for controlling the on-off of the main circuit of the circuit breaker, a control circuit is connected with the auxiliary contact and used for detecting the state of the auxiliary contact, the control circuit is connected with the power electronic device and used for driving the power electronic device to act, and the control circuit can drive the contact mechanism to act through the control coil;
under the condition that the control circuit is normally powered, a contact mechanism of a mechanical switch in the solid-state relay can be manually triggered, and after the control circuit detects the state of an auxiliary contact, the control circuit only drives a power electronic device to act according to the state of the auxiliary contact to enable a main circuit of the circuit breaker to be conducted, or drives the power electronic device and a control coil step by step to enable the power electronic device and the contact mechanism to act step by step to enable the main circuit of the circuit breaker to be disconnected;
under the condition that the control circuit is normally powered, the contact mechanism of the mechanical switch can be electrically triggered, and when the control circuit receives an automatic control signal, the control circuit drives the power electronic device and the control coil step by step according to the control signal so that the power electronic device and the contact mechanism act step by step to control the on-off of a main circuit of the circuit breaker;
when the control circuit is de-energized, the contact mechanism of the mechanical switch can only be manually triggered and cannot be electrically triggered, and the control circuit cannot turn on the power electronics.
The utility model discloses a solid-state circuit breaker and control method thereof sets up the mechanical switch that can be triggered by manual or electronic in solid-state circuit breaker, and when the control circuit of solid-state circuit breaker was interrupted the power supply, can realize mechanical switch's disconnection and closure through manual trigger mechanical switch, still can normally drive mechanical switch after the control circuit resumes the power supply, has overcome the defect that current solid-state circuit breaker can not close a floodgate after the outage.
An embodiment of a solid state circuit breaker and a control method thereof will be described in detail with reference to fig. 1, the solid state circuit breaker including a mechanical switch, power electronics, and a control circuit; the mechanical switch can be triggered manually (see manual trigger point a of the mechanical switch in fig. 1) or electrically, the mechanical switch comprises a contact mechanism and a control coil which can drive the contact mechanism, the contact mechanism comprises a main contact and at least one auxiliary contact, the main contact and the auxiliary contact act synchronously, the main contact and the power electronic device are connected in series on a main circuit of the circuit breaker and used for controlling the on-off of the main circuit of the circuit breaker, the control circuit is connected with one auxiliary contact, the control circuit judges the action of the main contact by detecting the state of the auxiliary contact, the control circuit is connected with the power electronic device, the control circuit judges the state of the main contact by detecting the state of the auxiliary contact, the control circuit drives the contact mechanism to act through the control coil, and the mechanical switch is electrically triggered. In this embodiment, the control circuit has a signal processing function, and after receiving and processing the signal, the control circuit outputs a corresponding level signal to drive the power electronic device to open or close.
In the embodiment, when the mechanical switch is triggered to be closed manually or electrically, the main contact is closed before the auxiliary contact; when the mechanical switch is triggered to be opened manually or electrically, the auxiliary contact is opened before the main contact. Particularly, when the mechanical switch is manually triggered to be closed, the main contact is closed before the auxiliary contact, and the control circuit controls the conduction of the power electronic device after detecting the closing of the auxiliary contact; when the mechanical switch is triggered to be disconnected manually, the auxiliary contact is disconnected before the main contact, and the control circuit controls the power electronic device to be closed before the main contact is disconnected after detecting that the auxiliary contact is disconnected.
Preferably, the main contact, the auxiliary contact, the drive coil can be in same device, the main contact closes earlier than the auxiliary contact when closing, the main contact breaks off behind the auxiliary contact when breaking off, so, when control circuit detects the auxiliary contact closed, the main contact must be in the closure state, when control circuit detects the auxiliary contact and is in the off-state, the main contact must be in the in-process that breaks off, close through control circuit drive power electronics this moment, because power electronics speed is faster than mechanical structure speed, power electronics can turn off the main return circuit fast, compare the current solid state circuit breaker of realizing the shutoff to the main line through the mechanical switch action, the turn-off speed of this application is obviously very fast.
Embodiments of a contact mechanism are provided in which the main contact has a smaller opening than the auxiliary contact and an over travel greater than the auxiliary contact under the same total travel condition as the auxiliary contact, such that when the contact mechanism is operated synchronously, the main contact closes before the auxiliary contact and the auxiliary contact opens before the main contact. For example, the main contact and the auxiliary contact are triggered synchronously, the contact opening distance of the main contact is 1mm, the over travel is 2mm, the total stroke is 3mm, the contact opening distance of the auxiliary contact is 2mm, the over travel is 1mm, and the total stroke is 3 mm. In the closing process, when the main contact moves to 1mm, the main contact is closed, the auxiliary contact also runs by 1mm at the moment, but the auxiliary contact is not closed, when the main contact and the auxiliary contact both run by 2.1mm-3mm, the main contact and the auxiliary contact are both closed, and at the moment, the closing action is finished; the auxiliary contact is closed, the main contact is also closed, and the closing action is finished at the moment; in the opening process, when the return distance of the main contact and the auxiliary contact is between 1.1 mm and 1.9mm, the auxiliary contact is already opened, the main contact is in a closed state at the moment, and when the return distance of the main contact and the auxiliary contact is between 2.1mm and 3mm, the main contact and the auxiliary contact are both in an open state.
Under the condition that the control circuit is normally powered, a contact mechanism of a mechanical switch in the solid-state relay can be manually triggered, and the control circuit detects the state of the auxiliary contact, so that the control circuit judges the action state of the main contact according to the state of the auxiliary contact and sends a control instruction. When the mechanical switch is manually triggered to be closed, the main contact and the auxiliary contact of the contact mechanism simultaneously start to close, the main contact is closed earlier than the auxiliary contact, an electric signal generated after the auxiliary contact is closed is transmitted to the control circuit, the control circuit drives the power electronic device to be conducted, and the manual closing action is completed; when the mechanical switch is manually triggered to be switched off, the main contact and the auxiliary contact of the contact mechanism simultaneously start to be switched off, the auxiliary contact is switched off earlier than the main contact, an electric signal generated after the auxiliary contact is switched off is transmitted to the control circuit, the control circuit drives the power electronic device to be switched off, the main contact is not completely switched off at the moment, the power electronic device is switched off earlier than the main contact in time because the speed of the power electronic device is higher than that of the mechanical structure, and finally the main contact is switched off, and the manual switching-off operation is completed.
Under the condition that the control circuit is normally powered, the contact mechanism of the mechanical switch can be electrically triggered, and when the control circuit receives an automatic control signal, the control circuit drives the power electronic device and the mechanical switch to act step by step according to the control signal so as to control the on-off of a main circuit of the circuit breaker. When the contact mechanism of the electric trigger mechanical switch is closed or opened, the contact mechanism is synchronously driven by the control coil, but the main contact is closed before the auxiliary contact when the switch is closed, and the auxiliary contact is opened before the main contact when the switch is opened. It should be noted that the control circuit needs to be programmed, and only after the input voltage is normal and the control signal of the automatic closing is received, the control circuit can drive the mechanical switch to be closed.
The specific process is that when the control circuit is normally powered, when the control circuit acquires an automatic control signal and needs to be opened, for example, the control circuit receives the control signal from the overload protection mechanism or the short-circuit protection mechanism and needs to open the solid-state circuit breaker, the control circuit firstly drives the power electronic device to be closed, and then the contact mechanism is disconnected by driving the control coil; when the control circuit is normally powered again, the control circuit obtains an automatic control signal to switch on, the control circuit drives the control coil to close the contact mechanism firstly, namely, the main contact is closed before the auxiliary contact, the control circuit is fed back to the control circuit to be in a closed state after the auxiliary contact is closed, and the control circuit drives the power electronic device to be switched on after detecting that the auxiliary contact is in the closed state.
When the control circuit is de-energized, the contact mechanism of the mechanical switch can only be triggered manually and cannot be triggered electrically, and the control circuit cannot conduct the power electronics, and at this point the power electronics is already in a non-conductive state.
An improvement of the present application is that the mechanical switch has a function of manual triggering, and no matter whether the control circuit is normally powered, the mechanical switch can be manually triggered, and thus, the mechanical switch can still be controlled by the control circuit after the power supply is recovered, the defect that the existing solid-state circuit breaker is only controlled by an electronic circuit is overcome, and the operation is convenient.
Furthermore, the control circuit is disconnected in the power supply process, the contact mechanism of the mechanical switch is not triggered manually to act, after the control circuit recovers the normal power supply process, the control circuit detects the state of the auxiliary contact and drives the power electronic device according to the state of the auxiliary contact, when the control circuit detects that the auxiliary contact is in a closed state, the control circuit drives the power electronic device to be connected, and when the control circuit detects that the auxiliary contact is in an open state, the control circuit does not drive the power electronic device to be connected.
In practical applications, when the power supply of the control circuit is interrupted, the contact mechanism of the mechanical switch may be in a closed state or in an open state.
When the mechanical switch is in a closed state and is not manually triggered, the contact mechanism of the mechanical switch can continuously keep the closed state, and after the control circuit recovers normal power supply again, the control circuit detects that the auxiliary contact is in the closed state and drives the power electronic device to be conducted; when the mechanical switch is in a closed state, the auxiliary contact of the mechanical switch is triggered to be disconnected manually, and when the control circuit detects that the auxiliary contact is in an open state, the control circuit does not drive the power electronic device to be connected. Of course, in this embodiment, it is preferable that the mechanical switch is kept in the last closed state when the power supply to the control circuit is interrupted, and the control circuit drives the power electronic device to be turned on after detecting that the auxiliary contact is in the closed state after the power supply to the control circuit is resumed.
When the mechanical switch is in an off state, the contact mechanism can be closed and kept in a closed state by manually triggering the mechanical switch, and after the control circuit recovers normal power supply, the control circuit detects that the auxiliary contact is in the closed state and drives the power electronic device to be conducted; when the mechanical switch is in an off state, the contact mechanism is not closed by manually triggering the mechanical switch, and after the control circuit recovers normal power supply, the control circuit does not drive the power electronic device to be switched on.
In this embodiment, the power supply mode of the control circuit is various, and the control circuit is favorably applied to different scenes, the control circuit is preferably selected to be capable of directly taking power from the power supply system of the solid-state circuit breaker, the mechanical switch is preferably of a magnetic holding structure or a self-holding structure at the time, the control circuit can also be provided with a power supply, the mechanical switch is preferably of an electric holding structure at the time, but the self-provided power supply has service life limitation, the power supply needs to be replaced at regular time, and the effect of taking power from the power supply system is not good.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A solid state circuit breaker, characterized by: the power electronic device comprises a mechanical switch, a power electronic device and a control circuit; the mechanical switch can be triggered manually or electrically, the mechanical switch comprises a contact mechanism and a control coil capable of driving the contact mechanism to act, the contact mechanism comprises a main contact and an auxiliary contact, the main contact and a power electronic device are connected in series on a main circuit of the circuit breaker and used for controlling the on-off of the main circuit of the circuit breaker, a control circuit is connected with the auxiliary contact and used for detecting the state of the auxiliary contact, the control circuit is connected with the power electronic device and used for driving the power electronic device to act, and the control circuit can drive the contact mechanism to act through the control coil.
2. The solid state circuit breaker of claim 1, wherein: when the mechanical switch is triggered to be closed manually or electrically, the main contact is closed before the auxiliary contact; when the mechanical switch is triggered to be opened manually or electrically, the auxiliary contact is opened before the main contact.
3. The solid state circuit breaker of claim 2, wherein: the main contact, the auxiliary contact and the control coil are assembled together, the total stroke of the main contact is the same as that of the auxiliary contact, the opening distance of the main contact is smaller than that of the auxiliary contact, and the overtravel of the main contact is larger than that of the auxiliary contact.
4. The solid state circuit breaker of claim 1, wherein: when the mechanical switch is manually triggered to be closed, the main contact is closed before the auxiliary contact, and the control circuit controls the conduction of the power electronic device after detecting the closing of the auxiliary contact; when the mechanical switch is triggered to be disconnected manually, the auxiliary contact is disconnected before the main contact, and the control circuit controls the power electronic device to be closed before the main contact is disconnected after detecting that the auxiliary contact is disconnected.
5. The solid state circuit breaker of claim 1, wherein: the control circuit obtains electricity from a power supply system of the circuit breaker, and the mechanical switch is of a magnetic holding structure or a self-holding structure.
6. The solid state circuit breaker of claim 1, wherein: the control circuit is provided with a power supply, and the mechanical switch is an electric holding structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021905252.6U CN212695050U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021905252.6U CN212695050U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
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| Publication Number | Publication Date |
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| CN212695050U true CN212695050U (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021905252.6U Active CN212695050U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
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| CN (1) | CN212695050U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035037A (en) * | 2021-11-19 | 2022-02-11 | 金琥新能源汽车(成都)有限公司 | Relay, relay detection system and electric automobile |
-
2020
- 2020-09-03 CN CN202021905252.6U patent/CN212695050U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035037A (en) * | 2021-11-19 | 2022-02-11 | 金琥新能源汽车(成都)有限公司 | Relay, relay detection system and electric automobile |
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