CN210807067U - Load ignition protection circuit of solid-state modulator - Google Patents
Load ignition protection circuit of solid-state modulator Download PDFInfo
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- CN210807067U CN210807067U CN201922319819.5U CN201922319819U CN210807067U CN 210807067 U CN210807067 U CN 210807067U CN 201922319819 U CN201922319819 U CN 201922319819U CN 210807067 U CN210807067 U CN 210807067U
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Abstract
The embodiment of the application provides a load ignition protection circuit of a solid-state modulator, and relates to the technical field of solid-state modulators. The load ignition protection circuit is connected in parallel between a driving pulse signal of the controllable switch and a trigger end of the controllable switch and comprises a current detection unit, a switch unit, an energy storage capacitor and a voltage regulator tube, wherein one output end of the current detection unit is connected in series with the voltage regulator tube and then is connected to the trigger end or the output end of the switch unit, and the other output end of the current detection unit is connected to the output end or the trigger end of the switch unit; the input end and the output end of the switch unit are connected to the trigger end of the controllable switch in parallel, and the energy storage capacitor is connected to the trigger end and the output end of the switch unit in parallel and used for continuously providing driving energy for the switch unit. Through the arrangement, the controllable switch can be quickly turned off when the load is ignited (overcurrent), so that the reliability of the solid-state modulator system is improved.
Description
Technical Field
The application relates to the technical field of solid-state modulators, in particular to a load ignition protection circuit of a solid-state modulator.
Background
The solid-state modulator generally adopts an energy storage capacitor, a controllable switch and a pulse transformer to boost voltage so as to obtain high-voltage large-current pulse output. The controllable switch usually adopts semiconductor devices such as an IGBT, the IGBT is easy to damage when a load is ignited or the IGBT is in overcurrent, particularly, when the load is ignited, the short-circuit current quickly rises, the current on the IGBT can usually reach thousands of amperes or tens of thousands of amperes, and a quick and effective method for protecting the controllable switch and turning off the pulse needs to be provided, so that the ignition current is reduced as much as possible, and the load is protected.
In the prior art, a driving protection circuit in driving equipment is too complex and has more devices, the driving protection circuit is easily interfered when electromagnetic interference is serious in load ignition, the turn-off response is not fast enough, the pulse current is increased too much, and an IGBT (insulated gate bipolar transistor) is damaged by overcurrent, while the load of a solid-state modulator is a valuable device such as a klystron and a magnetron, and the service life of the solid-state modulator is seriously influenced by the overlarge ignition current.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a load striking sparks protection circuit of solid-state modulator, under the condition that strikes sparks appears in the load, provides an effectual switch protection circuit, and controllable switch is turn-off fast, restraines the electric current of striking sparks, avoids damaging controllable switch and influence back level load life because of the electric current is too big.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows: a load ignition protection circuit of a solid-state modulator is connected in parallel between a drive pulse signal of a controllable switch and a trigger end of the controllable switch and mainly comprises a current detection unit, a switch unit, an energy storage capacitor and a voltage regulator tube. One output end of the current detection unit is connected in series with a voltage regulator tube and then connected to the trigger end or the output end of the switch unit, and the other output end of the current detection unit is connected to the output end or the trigger end of the switch unit; the input end and the output end of the switch unit are connected to the trigger end of the controllable switch in parallel, and the energy storage capacitor is connected to the trigger end and the output end of the switch unit in parallel and used for continuously providing driving energy for the switch unit.
One end of the energy storage capacitor is connected between the trigger end (or the output end) of the switch unit and the voltage regulator tube, and the other end of the energy storage capacitor is connected to the output end (or the trigger end) of the switch unit.
The different capacities of the energy storage capacitors can realize different conduction time of the switch units, so that the turn-off time or the turn-on recovery time of the controllable switch is controlled. When the capacity of the energy storage capacitor is smaller, the on-time of the switch unit is shortened, and the off-time of the controllable switch is shortened; on the contrary, when the capacity of the energy storage capacitor is larger, the on-time of the switch unit is longer, and the off-time of the corresponding controllable switch is longer accordingly.
The current detection unit is a current transformer which is sleeved on an input end or an output end circuit of the controllable switch and is used for detecting the current flowing through the controllable switch. And two ends of the current transformer are connected with a resistor in parallel so as to output a voltage signal.
The voltage-stabilizing tube is a voltage-stabilizing diode or a transient suppression diode (TVS), and is conducted when the voltage signal output by the current detection unit reaches the threshold value of the voltage-stabilizing tube.
Preferably, a diode is further disposed on the input end or the output end line of the switching unit to prevent reverse conduction.
Preferably, two ends of the energy storage capacitor are connected in parallel with a discharge resistor, and the discharge resistor is connected in parallel between the switch unit and the capacitor.
The controllable switch includes, but is not limited to, an IGBT, a MOSFET, preferably an IGBT.
The switching unit includes, but is not limited to, a triode, an IGBT, and a MOSFET.
The driving pulse signal can be output by an isolation driving transformer, and one end or two ends of the output end of the isolation driving transformer are connected with a current limiting resistor in series, preferably, the current limiting resistor is connected with one end of the output end of the isolation driving transformer in series.
The current-limiting resistor is connected in series on a line of the protection circuit, specifically between the driving pulse signal and a connection line of the protection circuit.
The trigger end of the controllable switch is connected in parallel with a driving voltage regulator tube, specifically a voltage regulator diode or a transient suppression diode (TVS) for continuously providing constant driving voltage for the controllable switch.
The working principle of the load ignition protection circuit of the solid-state modulator is that a current detection unit detects the current condition of a controllable switch in real time, when the current overcurrent information of the controllable switch is detected, the output signal of the current detection unit enables a voltage stabilizing diode (or TVS) to be conducted in a single phase mode, then a trigger switch unit is triggered and conducted, an energy storage capacitor is charged and stored with energy, after the switch unit is conducted, a driving signal of a driving transformer is in short circuit, then the driving signal of the controllable switch is disconnected and the output of the controllable switch is turned off, and finally overcurrent protection of the controllable switch is achieved. When the controllable switch is applied to a pulse type power supply and needs to output a pulse signal, when the current detection unit detects discontinuous current overcurrent information, the voltage stabilizing diode (or TVS) is discontinuously switched on and triggers the switch unit to be switched on, and the energy storage capacitor is charged and stored with energy, and driving energy is provided for the switch unit based on the energy storage capacitor, so that the switch unit can be continuously switched on (the switching-on time is related to the capacity of the energy storage capacitor) within a certain time, the output of the controllable switch is thoroughly switched off and the output of the controllable switch is switched off, and finally, the overcurrent protection of the controllable switch is realized.
Adopt above-mentioned technical scheme's a load protection circuit that strikes sparks of solid-state modulator, its beneficial effect lies in: the protection circuit does not need extra power supply, and is simple, reliable and strong in anti-interference capability; the turn-off speed of the controllable switch during load ignition (overcurrent) can be increased, the controllable switch is protected, and meanwhile, the ignition current is inhibited and the rear-stage load is protected; aiming at the short pulse time and long interval time of the solid-state modulator, the energy storage capacitor is added in the protection circuit, so that the secondary switching-on of the controllable switch after the current pulse overcurrent protection can be prevented, and the normal switching-on of the next pulse is not influenced. In addition, the protection action of the protection circuit is irrelevant to the load, the controllable switch can be turned off when the controllable switch is in overcurrent, the overcurrent caused by load ignition can be protected, the overcurrent caused by the reason of magnetic biasing and the like of the pulse transformer can be protected, and the safety of the controllable switch and the reliability of the solid-state modulator system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a diagram of a solid-state modulator system according to an embodiment of the present application.
Fig. 2 is a load arcing protection circuit according to an embodiment of the present disclosure.
Fig. 3 is another load arcing protection circuit provided in an embodiment of the present application.
Fig. 4 is another load arcing protection circuit provided in the embodiment of the present application.
Fig. 5 is another load strike protection circuit provided in an embodiment of the present application.
The labels in the figure are: c: charging capacitance, C1: energy storage capacitor, D1: stabilivolt, D2: drive stabilivolt, D3: diode, Q: controllable switch, Q1: switching unit, R1: current limiting resistor, R2: discharge resistance, T: a pulse transformer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, a typical system diagram of a solid-state modulator mainly includes a dc power supply for generating pulses, a charging capacitor C, a pulse transformer T, and a magnetron.
The controllable switch Q is a solid-state switch of the solid-state modulator, and is a core device of the solid-state modulator, and mainly controls generation of pulses.
As shown in fig. 2, the load arcing protection circuit of the solid-state modulator provided in the embodiment of the present application is connected in parallel between the driving pulse signal of the controllable switch Q and the trigger terminal (G, E) thereof, and mainly includes a current detection unit, a switch unit Q1 (in this embodiment, Q1 is a triode), an energy storage capacitor C1, and a voltage regulator D1 (which may be a zener diode or a transient suppression diode TVS).
The current detection unit is a current transformer, is sleeved on an output circuit of the controllable switch Q, and is used for detecting the output current of the controllable switch Q. The output end of the current transformer is connected in parallel with a resistor for outputting a voltage signal, one output end of the current transformer is connected in series with a voltage regulator tube D1 and then connected to the trigger end of the switch unit Q1, and the other output end of the current transformer is connected to the output end of the switch unit Q1. The input and output ends of the switching unit Q1 are connected in parallel to the trigger end of the controllable switch Q. The energy storage capacitor C1 is connected in parallel to the trigger terminal and the output terminal of the switching unit Q1, and is used for continuously providing driving energy for the switching unit Q1. In order to ensure the stability of the driving signal of the controllable switch Q, a driving voltage regulator D2 is connected in parallel with a triggering end (G, E) of the controllable switch Q.
Referring to fig. 1 again, the load current of the solid-state modulator is proportional to the current of the controllable switch Q, and the current detecting unit is configured to detect the current of the controllable switch Q and form a voltage signal at the detection signal input terminal. Under normal conditions, the load is not ignited, the voltage signal input into the protection circuit by the current detection unit does not exceed the action threshold of the voltage regulator tube D1 (which can be a voltage regulator diode or a transient suppression diode TVS), the voltage on the capacitor C1 is 0, the switching unit Q1 is not conducted, and the pulse operates normally.
When the load is ignited, the load current rises rapidly, the current of the controllable switch Q also rises rapidly, when the voltage signal output by the current detection unit exceeds the action threshold value of the voltage regulator tube D1, the voltage regulator tube D1 is conducted and charges the energy storage capacitor C1, when the voltage on the energy storage capacitor C1 exceeds the action voltage of the switch unit Q1, the switch unit Q1 is conducted, the driving signal of the controllable switch Q is turned off, the controllable switch Q is further turned off, the current of the controllable switch Q and the load current reach the maximum value after the controllable switch Q is turned off, the current does not increase any more, and the rear-stage load and the controllable switch Q are protected finally.
In the above process, the pulse time of the solid-state modulator is usually short, and is several μ s or tens of μ s, but the interval time is ms, and the capacitance value of the energy storage capacitor C1 can be selected to ensure that the voltage on the energy storage capacitor C1 is maintained until the solid-state modulator control system turns off the current pulse, and when the next pulse comes, the voltage on the energy storage capacitor C1 is released to 0, so that the purpose of turning off only the current ignition pulse is realized, and the ignition protection of the system is realized. The protection circuit has the advantages that the current of the controllable switch Q is detected, internal devices are simple, the action time is very fast, once the current exceeds the action threshold value of the voltage regulator tube D1, the controllable switch Q can be turned off within ns-level time, the ignition current is restrained, and the solid-state modulator system is protected.
As shown in fig. 3, with respect to fig. 2, the difference is that the anode of the zener diode D1 is connected to the output terminal of the current detecting unit, and the cathode is connected to the output terminal of the switching unit Q1.
As shown in fig. 4, compared with fig. 2, the difference is that a current limiting resistor R1 (a current limiting resistor may be connected in series to two output terminals of the driving pulse signal, and this embodiment is only illustrated to be connected in series to one output terminal) is connected in series between the driving pulse signal and the load sparking protection circuit, and can be used for current limiting and voltage dividing of the circuit; the difference is that a discharge resistor R2 is connected in parallel between the switching unit Q1 and the energy storage capacitor C1 and can be used for discharging the electric energy of the protection circuit.
As shown in fig. 5, compared to fig. 2, the difference is that the switching unit Q1 is an IGBT (MOSFET may be used, IGBT in this embodiment) and a current limiting resistor R1 is connected in series between the driving pulse signal and the load arcing protection circuit, and a diode D3 is connected in series to the input line (output line may be used, input line in this embodiment) of the switching unit Q1 to prevent reverse conduction.
To sum up, the working principle of the load ignition protection circuit of the solid-state modulator provided by the embodiment of the application is that the current detection unit detects the current condition of the controllable switch in real time, when the current overcurrent information of the controllable switch is detected, the output signal of the current detection unit enables the voltage stabilizing diode (or TVS) to be conducted in a single phase mode, the switch unit is triggered and conducted, the energy storage capacitor is charged to store energy, the switch unit is conducted and then the drive signal of the drive transformer is in short circuit, the drive signal of the controllable switch is disconnected and the output of the controllable switch is turned off, and finally the overcurrent protection of the controllable switch is realized. When the controllable switch is applied to a pulse type power supply and needs to output a pulse signal, when the current detection unit detects discontinuous current overcurrent information, the voltage stabilizing diode (or TVS) is discontinuously switched on and triggers the switch unit to be switched on, and the energy storage capacitor is charged and stored with energy, and driving energy is provided for the switch unit based on the energy storage capacitor, so that the switch unit can be continuously switched on (the switching-on time is related to the capacity of the energy storage capacitor) within a certain time, the output of the controllable switch is thoroughly switched off and the output of the controllable switch is switched off, and finally, the overcurrent protection of the controllable switch is realized.
Adopt above-mentioned technical scheme's a load protection circuit that strikes sparks of solid-state modulator, its beneficial effect lies in: the protection circuit does not need extra power supply, and is simple, reliable and strong in anti-interference capability; the turn-off speed of the controllable switch during load ignition (overcurrent) can be increased, the controllable switch is protected, and meanwhile, the ignition current is inhibited and the rear-stage load is protected; aiming at the short pulse time and long interval time of the solid-state modulator, the energy storage capacitor is added in the protection circuit, so that the secondary switching-on of the controllable switch after the current pulse overcurrent protection can be prevented, and the normal switching-on of the next pulse is not influenced. In addition, the protection action of the protection circuit is irrelevant to the load, the controllable switch can be turned off when the controllable switch is in overcurrent, the overcurrent caused by load ignition can be protected, the overcurrent caused by the reason of magnetic biasing and the like of the pulse transformer can be protected, and the safety of the controllable switch and the reliability of the solid-state modulator system are improved.
The above detailed description of embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. A load ignition protection circuit of a solid-state modulator is connected in parallel between a driving pulse signal of a controllable switch and a trigger end of the controllable switch, and is characterized by comprising a current detection unit, a switch unit, an energy storage capacitor and a voltage stabilizing tube, wherein one output end of the current detection unit is connected in series with the voltage stabilizing tube and then connected to the trigger end or the output end of the switch unit, and the other output end of the current detection unit is connected to the output end or the trigger end of the switch unit; the input end and the output end of the switch unit are connected to the trigger end of the controllable switch in parallel, and the energy storage capacitor is connected to the trigger end and the output end of the switch unit in parallel and used for continuously providing driving energy for the switch unit.
2. The load strike protection circuit of claim 1, wherein one end of the energy storage capacitor is connected between the trigger terminal and the voltage regulator tube of the switching unit, and the other end of the energy storage capacitor is connected to the output terminal of the switching unit.
3. The load strike protection circuit of claim 1, wherein one end of the energy storage capacitor is connected between the output terminal of the switching unit and the voltage regulator tube, and the other end of the energy storage capacitor is connected to the trigger terminal of the switching unit.
4. The circuit of claim 1, wherein the capacitors have different capacities to achieve different on-times of the switch units, thereby controlling the off-time of the controllable switch.
5. The load strike protection circuit of the solid-state modulator of claim 1, wherein the current detection unit is a current transformer that is disposed on the input or output line of the controllable switch for detecting the current flowing through the controllable switch.
6. The load arcing protection circuit of the solid-state modulator according to claim 1, wherein the voltage regulator tube is a voltage regulator diode or a transient suppression diode, and the voltage regulator tube is turned on when the voltage signal output by the current detection unit reaches a voltage regulator tube threshold value.
7. The circuit of claim 1, wherein a diode is further disposed on the input or output line of the switching unit for preventing reverse conduction.
8. The circuit of claim 4, wherein a discharge resistor is connected in parallel across the energy storage capacitor, and the discharge resistor is connected in parallel between the switching unit and the capacitor.
9. The circuit of claim 1, wherein the switching unit is a transistor, an IGBT or a MOSFET.
10. The load arcing protection circuit of the solid-state modulator according to claim 1, wherein the driving pulse signal is output by an isolation driving transformer, and one or two ends of the output end of the isolation driving transformer are connected with a current limiting resistor in series, and the current limiting resistor is connected with a line of the protection circuit in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922319819.5U CN210807067U (en) | 2019-12-20 | 2019-12-20 | Load ignition protection circuit of solid-state modulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922319819.5U CN210807067U (en) | 2019-12-20 | 2019-12-20 | Load ignition protection circuit of solid-state modulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
| CN114094988A (en) * | 2022-01-18 | 2022-02-25 | 杭州维纳安可医疗科技有限责任公司 | Pulse generating circuit, equipment and method with pulse detection function |
| CN114156834A (en) * | 2021-11-30 | 2022-03-08 | 南京国睿防务系统有限公司 | Overcurrent protection assembly for ignition |
-
2019
- 2019-12-20 CN CN201922319819.5U patent/CN210807067U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
| CN112737360B (en) * | 2020-12-29 | 2022-07-05 | 上海骄成超声波技术股份有限公司 | Rectifying circuit and power supply |
| CN114156834A (en) * | 2021-11-30 | 2022-03-08 | 南京国睿防务系统有限公司 | Overcurrent protection assembly for ignition |
| CN114094988A (en) * | 2022-01-18 | 2022-02-25 | 杭州维纳安可医疗科技有限责任公司 | Pulse generating circuit, equipment and method with pulse detection function |
| CN114094988B (en) * | 2022-01-18 | 2022-09-09 | 杭州维纳安可医疗科技有限责任公司 | Pulse generating circuit, equipment and method with pulse detection function |
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