Crowbar circuit and power generation system
By designing a spudger circuit with alternate release circuits, the problems of low utilization rate and shortened life of the IGBT module in the prior art are solved, and the effect of extending the life of the power switch and simplifying the circuit structure is achieved.
Patent Information
- Application Number
- CN202421209491.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-05-29
Smart Images
Figure CN222547185U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crowbar circuits, and more specifically, to a crowbar circuit and a power generation system. Background Art
[0002] In the related art, the crowbar circuit only uses the upper half bridge or the lower half bridge of the IGBT module, which has a low utilization rate for the IGBT module. In addition, long-term use of the upper half bridge or the lower half bridge will cause the life of the IGBT module to be rapidly reduced, affecting the service life of the product. Utility Model Content
[0003] The embodiments of the utility model provide a crowbar circuit and a power generation system.
[0004] The utility model embodiment provides a crowbar circuit for protecting a target circuit, the crowbar circuit comprising a power switch, a single discharge resistor and a discharge switch, the power switch is connected to a positive connection end and a negative connection end of the target circuit, the power switch comprises a first power switch and a second power switch connected in series with each other; the discharge switch comprises a first discharge switch and a second discharge switch, the first discharge switch is connected in parallel with the first power switch through the discharge resistor, and the second discharge switch is connected in parallel with the second power switch through the discharge resistor; the first power switch, the second discharge switch and the discharge resistor can form a first discharge loop, the second power switch, the first discharge switch and the discharge resistor can form a second discharge loop, and in two adjacent discharge processes, the discharge resistor discharges energy of the target circuit alternately through the first discharge loop and the second discharge loop.
[0005] In this way, the discharge resistor can alternately discharge through different discharge circuits during two adjacent discharge processes, avoiding the use of only one of the power switches of the discharge circuits, which causes the power switch to be used for a long time and cause the life of the power switch to be rapidly reduced. Sharing one discharge resistor in multiple discharge circuits can reduce the number of components and simplify the circuit structure.
[0006] In some embodiments, the crowbar circuit further includes: a controller, which is used to output a discharge signal to control the on and off of the first power switch, the second power switch, the first discharge switch and the second discharge switch to alternately switch the first discharge circuit or the second discharge circuit for energy discharge.
[0007] In some embodiments, when the first power switch is short-circuited, the controller is used to control the discharge resistor to discharge energy through the second discharge circuit; when the second power switch is short-circuited, the controller is used to control the discharge resistor to discharge energy through the first discharge circuit.
[0008] In some embodiments, the discharge signal includes a first discharge signal and a second discharge signal, and the controller is used to output the first discharge signal to control the first power switch to be turned on, the second power switch to be turned off, the first discharge switch to be turned off, and the second discharge switch to be turned on, so as to control the discharge resistor to discharge energy through the first discharge circuit; the controller is used to output the second discharge signal to control the first power switch to be turned off, the second power switch to be turned on, the first discharge switch to be turned on, and the second discharge switch to be turned off, so as to control the discharge resistor to discharge energy through the second discharge circuit.
[0009] In certain embodiments, during each of the discharging processes, the controller is configured to control the discharging switch to be closed before the power switch is turned on.
[0010] In certain embodiments, when the target circuit needs to discharge energy continuously, in one discharge process, the discharge resistor is used to discharge energy multiple times through the same discharge circuit, and the discharge circuit includes the first discharge circuit or the second discharge circuit.
[0011] In certain embodiments, when the target circuit does not need to discharge energy continuously, in a discharge process, the discharge resistor is used to discharge energy once through a discharge circuit, and the discharge circuit includes the first discharge circuit or the second discharge circuit.
[0012] In certain embodiments, a first end of the first power switch and a positive connection end of the target circuit are electrically connected to a first end of the first discharge switch, a second end of the first power switch and a first end of the discharge resistor are electrically connected to a first end of the second power switch, a second end of the first discharge switch and a second end of the discharge resistor are electrically connected to a first end of the second discharge switch, and a second end of the second discharge switch and a negative connection end of the target circuit are electrically connected to the second power switch.
[0013] In this way, the first discharge switch is connected in parallel with the first power switch through the discharge resistor, and the second discharge switch is connected in parallel with the second power switch through the discharge resistor, so that a crowbar circuit can be formed. By changing the on-off state of the first discharge switch, the second discharge switch, the first power switch and the second power switch, different discharge loops can be formed, so that the discharge resistor can discharge the energy of the target circuit.
[0014] In some embodiments, the crowbar circuit also includes an absorption capacitor, a first end of the absorption capacitor is electrically connected to the positive connection terminal of the target circuit, a second end of the absorption capacitor is electrically connected to the negative connection terminal of the target circuit, the absorption capacitor is used to absorb energy of the target circuit, and the discharge resistor can be used to discharge the energy absorbed by the absorption capacitor.
[0015] In this way, the energy of the target circuit can be absorbed by the absorption capacitor, and when the crowbar circuit discharges the energy, the discharge resistor can also be used to discharge the energy in the absorption capacitor to discharge the energy of the target circuit.
[0016] An embodiment of the utility model provides a power generation system, which includes a power generation circuit and the crowbar circuit described in any of the above embodiments, wherein the crowbar circuit is used to discharge the energy of the power generation circuit, and the target circuit includes the power generation circuit.
[0017] In this way, the discharge resistor can alternately discharge through different discharge circuits during two adjacent discharge processes, avoiding the use of only one of the power switches of the discharge circuits, which causes the power switch to be used for a long time and cause the life of the power switch to be rapidly reduced. Sharing one discharge resistor in multiple discharge circuits can reduce the number of components and simplify the circuit structure.
[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0020] Figure 1 is a schematic diagram of a prior art crowbar circuit;
[0021] Figure 2 is another schematic diagram of a prior art crowbar circuit;
[0022] Figure 3 is a schematic diagram of a crowbar circuit according to an embodiment of the present utility model;
[0023] Figure 4 is a schematic diagram of the crowbar circuit of the embodiment of the utility model when discharging energy in the first discharge loop;
[0024] Figure 5 It is a schematic diagram of the crowbar circuit of the embodiment of the utility model when discharging energy in the second discharge loop. DETAILED DESCRIPTION
[0025] The embodiments of the present invention are described in detail below, and the embodiments of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0026] In the related art, the crowbar circuit only uses the upper half bridge or the lower half bridge of the IGBT module, which has a low utilization rate for the IGBT module. In addition, long-term use of the upper half bridge or the lower half bridge will cause the life of the IGBT module to be rapidly reduced, affecting the service life of the product.
[0027] The present invention provides a crowbar circuit 100 for protecting a target circuit 200. The crowbar circuit 100 includes a power switch 10, a single discharge resistor 20 and a discharge switch 30. The power switch 10 is connected to a positive connection terminal and a negative connection terminal of the target circuit 200. The power switch 10 includes a first power switch and a second power switch connected in series. The discharge switch 30 includes a first discharge switch and a second discharge switch. The first discharge switch is connected in parallel with the first power switch through the discharge resistor 20, and the second discharge switch is connected in parallel with the second power switch through the discharge resistor 20. The first power switch, the second discharge switch and the discharge resistor 20 can form a first discharge loop, and the second power switch, the first discharge switch and the discharge resistor 20 can form a second discharge loop. In two adjacent discharge processes, the discharge resistor 20 discharges energy of the target circuit 200 alternately through the first discharge loop and the second discharge loop.
[0028] Specifically, the power switch 10 may be an IGBT, and the target circuit 200 may be a power generation circuit in a wind power generation circuit or other circuit connected to a power grid. Figure 3 The capacitor C1 in the figure can be used to characterize the components in the target circuit 200. The two IGBTs are connected in parallel through a discharge resistor 20 and a discharge switch 30, respectively. The two IGBTs are connected in series with each other. The two IGBTs include a first IGBT and a second IGBT. The first end of the first power switch T1 is connected to the positive connection terminal DC+ of the target circuit 200, and the second end of the second power switch T2 is connected to the negative connection terminal DC- of the target circuit 200. In the related art, please refer to Figure 1 and Figure 2, only one discharge resistor is set in parallel with one half bridge of the IGBT, so that the discharge resistor continuously discharges through a loop formed by an IGBT when discharging, so that the life of the IGBT decays rapidly. In the embodiment of the present invention, the discharge capacitor R is connected to the connection midpoint AC of the two IGBTs and the connection midpoint O of the two discharge switches 30. In a discharge process, only one discharge switch 30 is closed, and the other discharge switch 30 is disconnected, and the IGBT connected in parallel with the closed discharge switch 30 is disconnected. When the IGBT connected in parallel with the turned-on discharge switch 30 is turned on, the turned-on IGBT, the closed discharge switch 30, the discharge resistor 20 and the target circuit 200 form a discharge loop, and the discharge resistor 20 can discharge the energy in the target circuit 200. For example, in a discharge process, the second discharge switch KM2 is continuously closed, the first discharge switch KM1 is continuously disconnected, and the second power switch T2 is continuously disconnected. When the first power switch T1 is turned on, the first power switch T1 and the second discharge switch KM2 form a first discharge loop, and the discharge resistor R can discharge energy through the first discharge loop to discharge the energy in the target circuit 200. The crowbar circuit 100 further includes a support capacitor C2, which can absorb the energy of the target circuit 200. In the discharge process, the discharge resistor 20 can discharge the energy of the target circuit 200 absorbed by the support capacitor C2.
[0029] In this way, the discharge resistor 20 can discharge alternately through different discharge circuits during two adjacent discharge processes, thereby avoiding the use of only one of the discharge circuits of the power switch 10, which causes the life of the power switch 10 to be quickly reduced due to long-term use. Sharing one discharge resistor 20 in multiple discharge circuits can reduce the number of components and simplify the circuit structure.
[0030] In some embodiments, the crowbar circuit 100 further includes a controller, which is configured to output a discharge signal to control the on and off of the first power switch, the second power switch, the first discharge switch, and the second discharge switch to alternately switch the first discharge circuit or the second discharge circuit for energy discharge.
[0031] Specifically, the controller can be a DSP, an MCU, etc., and the same controller is used to control the switching of the two discharge circuits, so as to ensure that the two discharge circuits do not perform discharge work at the same time. The gates of the first power switch T1 and the second power switch T2 are connected to the controller, and the controller is used to output a discharge signal according to whether the voltage of the target circuit 200 exceeds the discharge threshold. When the voltage of the target circuit 200 exceeds the discharge threshold, the controller outputs a discharge signal to control the first power switch T1 or the second power switch T2 to be turned on, so that the turned-on power switch 10, the closed discharge switch 30 and the discharge resistor 20 form a discharge circuit, so that the discharge resistor 20 can discharge; and the controller controls the on and off of the first power switch, the second power switch, the first discharge switch and the second discharge switch to alternately switch the first discharge circuit or the second discharge circuit for energy discharge, so that both power switches 10 can be used for energy discharge, so as to avoid long-term use of only one power switch 10 for discharge affecting the life of the power switch 10.
[0032] In this way, the controller outputs a discharge signal to control the on and off of the first power switch, the second power switch, the first discharge switch and the second discharge switch, so that the first discharge circuit or the second discharge circuit can be switched alternately for energy discharge, so that both power switches can be used for discharge.
[0033] In some embodiments, when the first power switch is short-circuited, the controller is used to control the discharge resistor 20 to discharge energy through the second discharge circuit; when the second power switch is short-circuited, the controller is used to control the discharge resistor 20 to discharge energy through the first discharge circuit.
[0034] Specifically, the two IGBTs are isolated from each other. When one of the IGBTs is short-circuited, if the other IGBT is turned on, the crowbar circuit 100 does not form a short circuit. When one of the IGBTs is short-circuited, the other IGBT can be used to discharge energy, and the discharge switch 30 connected in parallel with the short-circuited IGBT is controlled to be continuously closed. When the non-short-circuited IGBT is turned on, the non-short-circuited IGBT and the closed discharge switch 30 and the discharge resistor 20 form a discharge circuit, so that the discharge resistor 20 can discharge energy. When the first power switch T1 is short-circuited, the discharge resistor R discharges energy through the second discharge circuit; when the second power switch T2 is short-circuited, the discharge resistor R discharges energy through the first discharge circuit.
[0035] In this way, when one power switch 10 is short-circuited, the discharge loop formed by another power switch 10 can be used to discharge energy, providing a redundant protection for the crowbar circuit 100, so that when one power switch 10 is short-circuited, the crowbar circuit 100 can also discharge energy.
[0036] In some embodiments, the discharge signal includes a first discharge signal and a second discharge signal. The controller is used to output the first discharge signal to control the first power switch to be turned on, the second power switch to be turned off, the first discharge switch to be turned off, and the second discharge switch to be turned on, so as to control the discharge resistor 20 to discharge energy through the first discharge circuit; the controller is used to output the second discharge signal to control the first power switch to be turned off, the second power switch to be turned on, the first discharge switch to be turned on, and the second discharge switch to be turned off, so as to control the discharge resistor 20 to discharge energy through the second discharge circuit.
[0037] Specifically, when the controller outputs a first discharge signal to control the second discharge switch to be closed and the first power switch to be turned on, the second discharge switch, the second power switch, the discharge resistor 20 and the target circuit 200 form a first discharge loop, and the discharge resistor 20 can discharge the energy of the target circuit 200 through the second discharge switch and the first power switch; when the controller outputs a second discharge signal to control the first discharge switch to be closed and the second power switch to be turned on, the first discharge switch, the second power switch, the discharge resistor 20 and the target circuit 200 form a second discharge loop, and the discharge resistor 20 can discharge the energy of the target circuit 200 through the first discharge switch and the second power switch.
[0038] In two adjacent discharge processes, the controller can switch from outputting the first discharge signal to outputting the second discharge signal, thereby switching from closing the second discharge switch and turning on the first power switch to closing the first discharge switch and turning on the second power switch, so as to switch different discharge circuits for energy discharge, that is, switching from discharging energy through the first discharge circuit by the discharge resistor 20 to discharging energy through the second discharge circuit; or the controller can switch from outputting the second discharge signal to outputting the first discharge signal, switching from closing the first discharge switch and turning on the second power switch to closing the second discharge switch and turning on the first power switch, that is, switching from discharging energy through the second discharge circuit by the discharge resistor 20 to discharging energy through the first discharge circuit.
[0039] In this way, when the first discharge switch is closed and the second power switch is turned on, and when the second discharge switch is closed and the first power switch is turned on, two different discharge circuits can be formed to discharge energy, so that both the first power switch and the second power switch can be used to discharge energy, avoiding damage or affecting the life of only using a single power switch 10 for energy discharge.
[0040] In some embodiments, during each discharge process, the controller is configured to control the discharge switch 30 to be closed before the power switch 10 is turned on.
[0041] Specifically, since the on-time of the IGBT is very short, and the time required for the discharge switch 30 to switch on and off is relatively long, if the discharge switch 30 and the IGBT are closed and turned on at the same time, the discharge switch 30 may not be closed when the IGBT is turned on, resulting in the discharge switch 30 being unable to form a discharge loop with the IGBT and the resistor to discharge the energy of the target circuit 200. Therefore, the controller pre-controls the discharge switch 30 to be closed before the IGBT is turned on, so that when the IGBT is turned on, a discharge loop can be formed by the IGBT, the discharge switch 30 and the target circuit 200, so that the discharge resistor 20 can discharge energy.
[0042] In one embodiment, in the current discharge process, the discharge resistor R discharges in the first discharge loop. When entering the current discharge process, the second discharge switch KM2 has been closed. When the first power switch T1 receives the discharge signal and turns on, the first power switch T1, the second discharge switch KM2 and the discharge resistor R form a first discharge loop. The discharge resistor R discharges energy through the first power switch T1 and the second discharge switch KM2 of the first discharge loop.
[0043] In this way, by controlling the discharge switch 30 to be closed before the power switch 10 is turned on each time the energy is discharged, the problem that the discharge switch 30 is not closed when the power switch 10 is turned on, resulting in the inability to discharge energy, can be avoided.
[0044] In some embodiments, when the target circuit 200 needs to discharge energy continuously, in one discharge process, the discharge resistor 20 is used to discharge energy multiple times through the same discharge loop, and the discharge loop includes a first discharge loop or a second discharge loop.
[0045] Specifically, the power generation circuit is connected to the power grid. When the voltage of the power grid fluctuates continuously, the power generation circuit needs to continuously discharge energy to prevent the fluctuation of the power grid voltage from affecting the normal operation of the power generation circuit. Since the power switch 10 is closed for only a short time each time, and it takes a long time for the discharge switch 30 to switch the switch state, in order to avoid that the discharge switch 30 connected in parallel with the power switch 10 has not completed switching when the power switch 10 is closed, when the target circuit 200 needs to continuously discharge energy, the crowbar circuit 100 is placed in a continuous working state. At this time, in a discharge process, one discharge switch 30 is controlled to maintain a closed state, and the other discharge switch 30 is maintained in an open state, the power switch 10 connected in parallel with the closed discharge switch 30 is maintained in an open state, and the power switch 10 connected in parallel with the open discharge switch 30 is controlled to switch the on-off state. When the power switch 10 is turned on, the power switch 10, the closed discharge switch 30 and the discharge resistor 20 form a discharge loop, so that the discharge resistor 20 can discharge the energy of the target circuit 200, so that by controlling the on-state of one power switch 10, the discharge resistor 20 can discharge energy multiple times through the same discharge loop.
[0046] In one embodiment, see Figure 4 , the discharge switch KM2 is continuously closed, the discharge switch KM1 is continuously opened, the power switch T1 receives the discharge signal and is turned on, the power switch T2 is turned off, and the power switch T1, the discharge resistor R, the discharge switch KM2 and the target circuit 200 form a loop, so that the discharge resistor R can discharge the energy of the target loop.
[0047] In this way, when the target circuit 200 needs to discharge energy continuously, in one discharge process, the discharge resistor 20 can be used to discharge energy multiple times through the same discharge circuit without switching between two discharge circuits, thereby avoiding the discharge switch 30 not being able to switch in time and resulting in ineffective energy discharge.
[0048] In some embodiments, when the target circuit 200 does not need to discharge energy continuously, in a discharge process, the discharge resistor 20 is used to discharge energy once through a discharge loop, and the discharge loop includes a first discharge loop or a second discharge loop.
[0049] Specifically, when the target circuit 200 does not need to discharge energy continuously, the interval between two adjacent energy discharges is long enough to switch the discharge switch 30. Therefore, in order to make full use of the two IGBTs of the IGBT bridge, in one discharge process, only one discharge circuit is used to discharge energy. In two adjacent discharge processes, the closed and open states of the two discharge switches 30 are switched, so that different power switches 10 and different discharge switches 30 are used in two adjacent discharge processes to form two discharge circuits for alternating discharge, so that each IGBT is used for energy discharge, avoiding a single IGBT from bearing a large current for a long time and resulting in a short life. In two adjacent discharge processes, the on-off states of the discharge switch 30 and the power switch 10 are as follows: Figure 4 and Figure 5 As shown, it can be Figure 4 The on / off state shown switches to Figure 5 , or Figure 5 The on / off state shown switches to Figure 4 .
[0050] In one embodiment, during the last discharge process, the on / off states of the discharge switch 30 and the power switch 10 are as follows: Figure 4 As shown, the second discharge switch KM2 is closed, the first discharge switch KM1 is disconnected, the first power switch T1 receives the discharge signal and is turned on, the second power switch T2 is disconnected, the first power switch T1, the discharge resistor R, the second discharge switch KM2 and the target circuit 200 form a first discharge loop, and the discharge resistor R discharges energy through the first discharge loop; in the current discharge process, the on-off state of the discharge switch 30 and the power switch 10 is as shown in FIG. Figure 5 As shown, the first discharge switch KM1 is closed, the second discharge switch KM2 is opened, the second power switch T2 receives the discharge signal and is turned on, the first power switch T1 is opened, the second power switch T2, the discharge resistor R, the first discharge switch KM1 and the target circuit 200 form a second discharge loop, and the discharge resistor R discharges energy through the second discharge loop.
[0051] In this way, when the target circuit 200 does not need to discharge energy continuously, in two adjacent discharge processes, the discharge resistor 20 discharges energy alternately through two discharge loops, thereby preventing a single power switch 10 from being continuously turned on, which may shorten its life or cause a failure.
[0052] In certain embodiments, the first bleeder switch and the second bleeder switch are not closed at the same time.
[0053] Specifically, a discharge switch 30 and a power switch 10 are connected in parallel, the first discharge switch and the second discharge switch are connected in series, the first discharge switch is connected to the positive connection end of the target circuit 200, and the second discharge switch is connected to the negative connection end of the target circuit 200. If the first discharge switch and the second discharge switch are closed at the same time, the closed discharge switch 30 directly forms a short circuit, which will cause the crowbar circuit 100 to fail, so the two discharge switches 30 are not closed at the same time.
[0054] In this way, the two discharge switches 30 are not closed at the same time, so as to avoid a short circuit and cause the crowbar circuit 100 to malfunction.
[0055] In some embodiments, the first end of the first power switch and the positive connection end of the target circuit 200 are electrically connected to the first end of the first discharge switch, the second end of the first power switch and the first end of the discharge resistor 20 are electrically connected to the first end of the second power switch, the second end of the first discharge switch and the second end of the discharge resistor 20 are electrically connected to the first end of the second discharge switch, and the second end of the second discharge switch and the negative connection end of the target circuit 200 are electrically connected to the second power switch.
[0056] Specifically, the first end of the first power switch T1, the positive connection end DC+ of the target circuit 200 and the first end of the first discharge switch K1 are electrically connected, the second end of the first power switch T1, the first end of the second power switch T2 and the first end of the discharge resistor R are electrically connected, the second end of the first discharge switch K1, the second end of the discharge resistor R and the first end of the second discharge switch K2 are electrically connected, and the second end of the second power switch T2, the negative connection end DC- of the target circuit 200 and the second end of the second discharge switch K2 are electrically connected to form the crowbar circuit 100. If the first discharge switch K1 is closed, when the second power switch T2 is turned on, the first discharge switch K1, the second power switch T2 and the discharge resistor R can form a second discharge loop; if the second discharge switch K2 is closed, when the first power switch T1 is turned on, the second discharge switch K2, the first power switch T1 and the discharge resistor R can form a first discharge loop.
[0057] In this way, the first discharge switch is connected in parallel with the first power switch through the discharge resistor 20, and the second discharge switch is connected in parallel with the second power switch through the discharge resistor 20, so that the crowbar circuit 100 can be formed. By changing the on-off state of the first discharge switch, the second discharge switch, the first power switch and the second power switch, different discharge loops can be formed, so that the discharge resistor 20 can discharge the energy of the target circuit 200.
[0058] In some embodiments, the crowbar circuit 100 also includes an absorption capacitor 40, a first end of the absorption capacitor 40 is electrically connected to the positive connection terminal of the target circuit 200, and a second end of the absorption capacitor 40 is electrically connected to the negative connection terminal of the target circuit 200. The absorption capacitor 40 is used to absorb the energy of the target circuit 200, and the discharge resistor 20 can be used to discharge the energy absorbed by the absorption capacitor 40.
[0059] Specifically, the absorption capacitor C3 is connected in parallel with the first power switch T1 and the second power switch T2, the first end of the absorption capacitor C3 is electrically connected to the positive connection terminal DC+ of the target circuit 200, the first end of the first power switch T1, and the first end of the first discharge switch KM1, and the second end of the absorption capacitor C3 is electrically connected to the negative connection terminal DC- of the target circuit 200, the second end of the second power switch T2, and the second end of the second discharge switch KM2. The absorption capacitor 40R can absorb the excess energy of the target circuit 200 when the energy discharge is not triggered, so as to avoid the excess energy affecting the target circuit 200 and causing a fault. When the crowbar circuit 100 discharges energy, the discharge capacitor R can also be used to discharge the energy in the absorption capacitor 40 to discharge the energy of the target circuit 200 absorbed by the discharge capacitor.
[0060] In this way, the energy of the target circuit 200 can be absorbed by the absorption capacitor 40 , and when the crowbar circuit 100 discharges energy, the discharge resistor 20 can also be used to discharge the energy in the absorption capacitor 40 to discharge the energy of the target circuit 200 .
[0061] An embodiment of the utility model provides a power generation system, which includes a power generation circuit and a crowbar circuit 100 of any of the above embodiments, wherein the crowbar circuit 100 is used to discharge the energy of the power generation circuit, and the target circuit 200 includes the power generation circuit.
[0062] In this way, the discharge resistor 20 can discharge alternately through different discharge circuits during two adjacent discharge processes, thereby avoiding the use of only one of the discharge circuits of the power switch 10, which causes the life of the power switch 10 to be quickly reduced due to long-term use. Sharing one discharge resistor 20 in multiple discharge circuits can reduce the number of components and simplify the circuit structure.
[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.
[0064] In addition, the term "connection" should be understood in a broad sense, for example, it can include fixed connection, detachable connection, or integral connection; it can include direct connection, indirect connection through an intermediate medium, and internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0066] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.
[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A crowbar circuit for protecting a target circuit, characterized in that: The crowbar circuit includes a power switch, a single discharge resistor and a discharge switch, wherein the power switch is connected to a positive connection terminal and a negative connection terminal of the target circuit, and the power switch includes a first power switch and a second power switch connected in series with each other; the discharge switch includes a first discharge switch and a second discharge switch, wherein the first discharge switch is connected in parallel with the first power switch through the discharge resistor, and the second discharge switch is connected in parallel with the second power switch through the discharge resistor; The first power switch, the second discharge switch and the discharge resistor can form a first discharge loop, the second power switch, the first discharge switch and the discharge resistor can form a second discharge loop, and in two adjacent discharge processes, the discharge resistor discharges energy of the target circuit alternately through the first discharge loop and the second discharge loop.
2. The crowbar circuit according to claim 1, characterized in that: The crowbar circuit further includes: A controller is used to output a discharge signal to control the on and off of the first power switch, the second power switch, the first discharge switch and the second discharge switch to alternately switch the first discharge circuit or the second discharge circuit for energy discharge.
3. The crowbar circuit according to claim 2, characterized in that: When the first power switch is short-circuited, the controller is used to control the discharge resistor to discharge energy through the second discharge circuit; when the second power switch is short-circuited, the controller is used to control the discharge resistor to discharge energy through the first discharge circuit.
4. The crowbar circuit according to claim 2, characterized in that: The discharge signal includes a first discharge signal and a second discharge signal, and the controller is used to output the first discharge signal to control the first power switch to be turned on, the second power switch to be turned off, the first discharge switch to be turned off, and the second discharge switch to be turned on, so as to control the discharge resistor to discharge energy through the first discharge circuit; The controller is used to output the second discharge signal to control the first power switch to be disconnected, the second power switch to be turned on, the first discharge switch to be closed, and the second discharge switch to be disconnected, so as to control the discharge resistor to discharge energy through the second discharge circuit.
5. The crowbar circuit according to claim 4, characterized in that: In each of the discharge processes, the controller is used to control the discharge switch to be closed before the power switch is turned on.
6. The crowbar circuit according to claim 1, characterized in that: When the target circuit needs to discharge energy continuously, in one discharge process, the discharge resistor is used to discharge energy multiple times through the same discharge circuit, and the discharge circuit includes the first discharge circuit or the second discharge circuit.
7. The crowbar circuit according to claim 1, characterized in that: When the target circuit does not need to discharge energy continuously, in one of the discharge processes, the discharge resistor is used to discharge energy once through a discharge circuit, and the discharge circuit includes the first discharge circuit or the second discharge circuit.
8. The crowbar circuit according to claim 1, characterized in that: The first end of the first power switch and the positive connection end of the target circuit are electrically connected to the first end of the first discharge switch, the second end of the first power switch and the first end of the discharge resistor are electrically connected to the first end of the second power switch, the second end of the first discharge switch and the second end of the discharge resistor are electrically connected to the first end of the second discharge switch, and the second end of the second discharge switch and the negative connection end of the target circuit are electrically connected to the second power switch.
9. The crowbar circuit according to claim 1, characterized in that: The crowbar circuit also includes an absorption capacitor, a first end of the absorption capacitor is electrically connected to the positive connection end of the target circuit, and a second end of the absorption capacitor is electrically connected to the negative connection end of the target circuit. The absorption capacitor is used to absorb energy of the target circuit, and the discharge resistor can be used to discharge the energy absorbed by the absorption capacitor.
10. A power generation system, characterized in that: The power generation system includes a power generation circuit and the crowbar circuit according to any one of claims 1 to 9, the crowbar circuit is used to discharge the energy of the power generation circuit, and the target circuit includes the power generation circuit.