Fault monitoring circuit applied to radar transmitter modulator

Abstract

The utility model provides a fault monitoring circuit applied to a radar transmitter modulator. The fault monitoring circuit comprises a modulation switch and a fault detection circuit. The modulation switch has voltage transformation, voltage division and regulation functions and is formed by connecting a plurality of groups of semiconductor switch assemblies in series; the fault detection circuit comprises an optical fiber part, an auxiliary power supply part and a plurality of groups of optocoupler parts; the auxiliary power supply part is used for providing a stable power supply VC for an optical fiber transmitting head N5 in the optical fiber part and a secondary level of an optocoupler in the optocoupler part; the optical fiber part comprises an optical fiber transmitting head N5 and a triode V33; the optocoupler part comprises an optocoupler and a current-limiting resistor R65. The optical fiber transmitting head N5, the current-limiting resistor R66, the collector electrode of the triode V33 and the emitter electrode of the triode V33 form an access. According to the fault detection circuit designed by the utility model, the voltage state of the semiconductor switch assembly is detected through the optocoupler part so as to control whether a path is conducted or not, and troubleshooting of the transmitter modulator is completed by observing the brightness change of the optical fiber transmitting head N5.

Description

TECHNICAL FIELD

[0001] The utility model belongs to modulator fault detection technical field, concretely relates to a kind of fault monitoring circuit applied to radar transmitter modulator. BACKGROUND

[0002] Radar transmitter often appears unable to normally increase voltage phenomenon in test process, this condition can be caused by multiple reasons, when executing test, must troubleshoot as soon as possible due to urgent situation, transmitter modulator fault belongs to one of fault directions, and it needs to be quickly troubleshooted.But due to transmitter modulator when working is in 20kV pulse high potential state, cannot use conventional way directly detection to transmitter modulator's switch tube, fault detection is difficult. INVENTION CONTENT

[0003] The utility model is to solve the problem of the prior art that transmitter modulator fault detection is difficult, and provides a kind of fault monitoring circuit applied to radar transmitter modulator.

[0004] To achieve the above object, the technical solution provided by the utility model is:

[0005] A kind of fault monitoring circuit applied to radar transmitter modulator is provided, it is characterized in that, including modulation switch and fault detection circuit;Modulation switch has voltage transformation, voltage division and adjustment function, is made of multiple groups of semiconductor switch component series connection, each group of semiconductor switch component includes six IGBT, sampling circuit and voltage-sharing protection circuit, and six IGBT, sampling circuit and voltage-sharing protection circuit are connected in parallel;Fault detection circuit includes optical fiber part, auxiliary power supply part and multiple groups of photoelectric coupler part;Optical fiber part includes optical fiber transmitting head N5, triode V33, flow resistance R66, filter capacitor C34, filter capacitor C35 and filter capacitor C36;Photoelectric coupler part includes photoelectric coupler and current-limiting resistor R65, photoelectric coupler part corresponds with semiconductor switch component one by one;Auxiliary power supply part is used to provide stable power supply VC for optical fiber transmitting head N5 and the secondary of photoelectric coupler;The primary of each photoelectric coupler is connected in parallel with corresponding sampling circuit, one secondary of each photoelectric coupler is connected with the output terminal of auxiliary power supply part after series connection with current-limiting resistor R65, each group of photoelectric coupler part is connected with the base of triode V33 after series connection with another secondary of photoelectric coupler in turn, optical fiber transmitting head N5, current-limiting resistor R66, the collector of triode V33 and the emitter of triode V33 form passage.

[0006] Further, the auxiliary power supply part comprises a transformer T1, a full-bridge circuit, a three-terminal voltage stabilizing power supply N6, a filter capacitor C33, an energy storage power supply C37, a current limiting resistor R67 and a light emitting diode V50, two input ends of the full-bridge circuit are connected with the transformer T1 respectively, two output ends of the full-bridge circuit are connected with the filter capacitor C33 and the energy storage power supply C37 respectively, and then connected with an input end of the three-terminal voltage stabilizing power supply N6, an output end of the three-terminal voltage stabilizing power supply N6 is connected with a fiber emission head N5 and a secondary of an optical coupler respectively, and the light emitting diode V50 is used for displaying whether the output of the three-terminal voltage stabilizing power supply N6 is normal.

[0007] Further, an input end of the transformer T1 is connected with an isolated power supply board in the modulator cabinet, the full-bridge circuit comprises a diode V29, a diode V30, a diode V31 and a diode V32, and the full-bridge circuit is used for rectifying alternating voltage transmitted by the transformer T1 into direct current voltage.

[0008] Further, the three-terminal voltage stabilizing power supply N6 outputs stable 15V voltage for use of the fiber emission head N5 and the secondary of the optical coupler.

[0009] Further, the sampling circuit comprises the resistor R53, the resistor R54 and the resistor R61, the resistor R53, the resistor R54 and the resistor R61 are connected in series, and the primary of the optical coupler is connected in parallel across the resistor R61.

[0010] The utility model discloses the advantages are:

[0011] The utility model discloses a fault detection circuit, the measuring path formed by power supply VC, fiber emission head N5, current limiting resistor R66 and triode V33, the supply of power supply VC is realized through the auxiliary power supply part, the voltage state of the semiconductor switch assembly is detected through the optical coupler part, whether the measuring path formed by power supply VC, fiber emission head N5, current limiting resistor R66 and triode V33 collector and emission level is conducted is controlled, through the observation of the light and dark change of fiber emission head N5, the troubleshooting of the modulator of the transmitter becomes more clear, eye -catching, intuitive, and the fault disposal efficiency under the emergency condition is greatly promoted, and the reliable guarantee is brought to the scientific test. DRAWINGS

[0012] The features and advantages of the utility model will become more apparent through the following description with reference to the drawings, which are not drawn to scale and in which some features are exaggerated or minimized for the sake of clarity, and in which:

[0013] Figure 1 It is a semiconductor switch assembly circuit diagram that a group of 6 IGBTs are connected in parallel in the utility model;

[0014] Figure 2 It is a circuit diagram of the auxiliary power supply part in the utility model;

[0015] Figure 3 is a circuit diagram of a group of optical coupling parts in the utility model;

[0016] Figure 4 is a circuit diagram of an optical fiber part in the utility model. DETAILED DESCRIPTION

[0017] The utility model will be described in detail below by referring to the accompanying drawings and by means of exemplary embodiments of the utility model. It should be pointed out that the following detailed description of the utility model is for illustrative purposes only and is not limiting on the utility model.

[0018] In order to solve the problem of great difficulty in detecting faults of the existing transmitter, the embodiment provides a fault monitoring circuit applied to a radar transmitter modulator, which comprises a modulation switch and a fault detection circuit.

[0019] As Figure 1 shown, the modulation switch has the functions of voltage transformation, voltage division and adjustment and is composed of a plurality of groups of semiconductor switch components connected in series, each group of semiconductor switch components comprising six IGBTs, a sampling circuit and an equal-voltage protection circuit, and the six IGBTs, the sampling circuit and the equal-voltage protection circuit being connected in parallel; as Figure 1 shown, V1-V6 are IGBTs, T2 is a transformer, R1-R6 are current-limiting resistors, connected to the corresponding IGBT gate electrodes respectively, C1-C6 are filter capacitors connected in parallel to the IGBTs, R25-R30 are gate resistors connected in parallel to the corresponding IGBT gate electrodes, mainly for rapid discharge of the trailing edge of the IGBT drive voltage, V42-V43 are zener diodes connected in parallel to the IGBT gate electrodes, mainly for protection, avoiding overvoltage of the gate electrode drive. The sampling circuit comprises resistors R53, R54 and R61, and the resistors R53, R54 and R61 are connected in series, and the primary of the optical coupling is connected in parallel across the resistor R61. Figure 1 The right part of the sampling circuit in the middle is the equal-voltage protection circuit, which realizes the function of the equal-voltage protection circuit.

[0020] As Figure 2 , 3 , 4 shown, the fault detection circuit comprises an optical fiber part, an auxiliary power supply part and a plurality of groups of optical coupling parts; as Figure 4As shown, the optical fiber part includes an optical fiber emitter N5, a triode V33, a current-limiting resistor R66, a filter capacitor C34, a filter capacitor C35, and a filter capacitor C36. The optical fiber emitter N5 is connected to the collector of the triode V33 through the current-limiting resistor R66. The filter capacitor C34 and the filter capacitor C35 are connected in parallel, with one end connected to the optical fiber emitter N5 and the other end grounded. The filter capacitor C36 is connected in parallel between the emitter of the triode V33 and the ground. The optical coupling part includes an optical coupler and a current-limiting resistor R65, which is used to supply the power supply VC. The optical coupling part corresponds to the semiconductor switch assembly one by one. The auxiliary power supply part is used to provide a stable power supply VC for the optical fiber emitter N5 and the secondary of the optical coupler.

[0021] Specifically, the three-terminal voltage regulator N6 outputs a stable 15V voltage for the optical fiber emitter N5 and the secondary of the optical coupler.

[0022] As shown in Figure 2 The auxiliary power supply part includes a transformer T1, a full-bridge circuit, a three-terminal voltage regulator N6, a filter capacitor C33, an energy storage power supply C37, a current-limiting resistor R67, and a light-emitting diode V50. The input end of the transformer T1 is connected to the isolated power supply board in the modulator cabinet. The full-bridge circuit includes diodes V29, V30, V31, and V32, which is used to rectify the alternating voltage transmitted by the transformer T1 into direct current voltage. The two input ends of the full-bridge circuit are connected to the transformer T1. The two output ends of the full-bridge circuit are connected to the input end of the three-terminal voltage regulator N6 through the filter capacitor C33 and the energy storage power supply C37. The output end of the three-terminal voltage regulator N6 is connected to the optical fiber emitter N5 and the secondary of the optical coupler. The voltage regulator end of the three-terminal voltage regulator N6 is grounded. The light-emitting diode V50 is used to display whether the output of the three-terminal voltage regulator N6 is normal. The output of the three-terminal voltage regulator N6 also passes through the current-limiting resistor R67 and the light-emitting diode V50. One end of the current-limiting resistor R67 is connected to the output of the three-terminal voltage regulator N6, and the other end is connected to the anode of the light-emitting diode V50. The cathode of the light-emitting diode V50 is grounded. When the modulating switch is working, the normal light emission of the light-emitting diode V50 indicates that the output of the three-terminal voltage regulator N6 is normal. If the light-emitting diode V50 does not emit light, it indicates that the output of the three-terminal voltage regulator N6 is abnormal.

[0023] As shown in Figure 3 The primary of each optical coupler is connected in parallel to the corresponding sampling circuit. One secondary of each optical coupler is connected in series with the current-limiting resistor R65 and then connected to the output end of the auxiliary power supply part. Each group of optical coupling parts is connected in series with each other through the other secondary of the optical coupler and then connected to the base of the triode V33, as shown in Figure 4 The collector of the triode V33 and the emitter of the triode V33 form a path with the optical fiber emitter N5 and the current-limiting resistor R66.

[0024] The fault detection principle is as follows:

[0025] As shown in Figure 3 , the resistance R53, the resistance R54 and the resistance R61 constitute a sampling circuit, and the voltage between the two ends of the IGBT V6 is sampled after being connected in series. The voltage between the two ends of the resistance R61 is the sampling voltage. If one IGBT is damaged (breakdown short circuit), it is a modulation switch fault.

[0026] As shown in the auxiliary power supply part circuit diagram, Figure 2 , the primary input of the transformer T1 is the output of the isolation power supply board in the modulator cabinet. After being isolated by the transformer T1, the alternating voltage is transmitted to the modulation switch. The diode V29, the diode V30, the diode V31 and the diode V32 constitute a full-bridge circuit to rectify the alternating voltage into a direct current voltage (about 18V). The direct current voltage is output after being stabilized by the three-terminal voltage regulator N6, and the stabilized 15V power supply VC is used for the optical fiber emitter N5 and the secondary of the optical coupler.

[0027] In normal operation, the IGBT V6 works in a pulse state, so the voltage between the two ends of the resistance R61 is also a small amplitude pulse sampling voltage. The pulse voltage can make the primary of the optical coupler N1 conduct. According to the characteristics of the optical coupler, when the primary (1, 2 pins) is conductive, the secondary (3, 4) will also be conductive. Similarly, the secondaries (3, 4) of the optical couplers N1-N4 in the four groups of optical coupler parts will be conductive. The power supply VC on the right side of the optical coupler N1 is transmitted to the Figure 4 base stage of the triode V33 through the current limiting resistor R65 and the secondaries of the optical couplers N1-N4 in the four groups of optical coupler parts. The V33 base stage is at a high level of VC. According to the working characteristics of the triode V33, when the base stage is at a high level, the collector and emitter of the triode V33 will be conductive. Therefore, the power supply VC forms a path through the optical fiber emitter N5 (2, 6, 3, 7 pins), the current limiting resistor R66 and the collector and emitter of the triode V33. At this time, the optical fiber emitter N5 emits light.

[0028] In the fault state, if one or more of the IGBT V1-V6 is breakdown short circuit, the voltage between the two ends of the IGBT V6 becomes 0, and the voltage between the two ends of the resistance R61 also becomes 0. Therefore, the primary of the optical coupler N1 is no longer conductive. Similarly, if one IGBT in the other group of optical coupler parts is damaged, it will also cause the secondaries (3, 4) of the other optical couplers (N2-N4) to be no longer conductive. The optical couplers N1-N4 are in series. As long as one optical coupler is not conductive, the high level of the power supply VC cannot be transmitted to the base stage of the triode V33, and the base stage of the triode V33 will become low. At this time, the path formed by the power supply VC, the optical fiber emitter N5 (2, 6, 3, 7 pins), the current limiting resistor R66 and the collector and emitter of the triode V33 is not conductive, and the optical fiber emitter N5 no longer emits light.

[0029] Therefore, whether the modulation switch works normally can be judged by judging whether the optical fiber emission head N5 emits light.

[0030] In the embodiment, the modulation switch is composed of four groups of semiconductor switch components in series, and each group is composed of six IGBTs in parallel. The fault monitoring circuit is composed of an auxiliary power supply part, an optical coupling part and an optical fiber part. The VC power supply is supplied by the auxiliary power supply part. When the IGBT V1-V6 is normal, the optical coupler N1-N4 in the four groups of optical coupling parts is turned on. According to the working characteristics of the triode V33, when the base level is high, the triode collector and emitter will be turned on. Therefore, the power supply VC forms a path through the optical fiber emission head N5, R66 and the triode collector and emitter, and the optical fiber emission head N5 emits light at this time. By observing the light and dark changes of the optical fiber emission head, the troubleshooting of the transmitter modulator becomes clearer, more eye-catching and more intuitive, greatly improving the fault handling efficiency in emergency and providing reliable protection for scientific experiments.

[0031] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present application can be combined in the same or similar manner into one or more other embodiments, combined with or replace the corresponding features in other embodiments. The technical solutions obtained by combining or replacing should be considered to be included in the protection scope of the present application.

Claims

1. A fault monitoring circuit for application to a radar transmitter modulator, characterised in that, The application relates to a modulation switch with voltage transformation, voltage division and regulation functions, which is composed of a plurality of groups of semiconductor switch components in series, each group of the semiconductor switch components comprising six IGBTs, a sampling circuit and a voltage equalization protection circuit, and the six IGBTs, the sampling circuit and the voltage equalization protection circuit being in parallel. The fault detection circuit comprises an optical fiber part, an auxiliary power supply part and a plurality of groups of optical coupling parts; the optical fiber part comprises an optical fiber emitting head N5, a triode V33, a current resistance R66, a filter capacitor C34, a filter capacitor C35 and a filter capacitor C36; the optical coupling part comprises an optical coupling and a current resistance R65, and the optical coupling part corresponds to the semiconductor switch component one by one; the auxiliary power supply part is used for providing a stable power supply VC for the optical fiber emitting head N5 and the secondary of the optical coupling; the primary of each optical coupling is in parallel with the corresponding sampling circuit, one secondary of each optical coupling is connected with the output end of the auxiliary power supply part in series with the current resistance R65, and the optical coupling parts of each group are connected with the base of the triode V33 in series one by one through the other secondary of the optical coupling, and the optical fiber emitting head N5, the current resistance R66, the collector of the triode V33 and the emitter of the triode V33 form a path. The auxiliary power supply part comprises a transformer T1, a full-bridge circuit, a three-terminal voltage stabilizing power supply N6, a filter capacitor C33, an energy storage power supply C37, a current resistance R67 and a light emitting diode V50, two input ends of the full-bridge circuit are connected with the transformer T1 respectively, two output ends of the full-bridge circuit are connected with the input end of the three-terminal voltage stabilizing power supply N6 after being connected with the filter capacitor C33 and the energy storage power supply C37 respectively, the output end of the three-terminal voltage stabilizing power supply N6 is connected with the optical fiber emitting head N5 and the secondary of the optical coupling respectively, and the light emitting diode V50 is used for displaying whether the output of the three-terminal voltage stabilizing power supply N6 is normal. The input end of the transformer T1 is connected with an isolation power supply board in a modulator cabinet, the full-bridge circuit comprises diodes V29, V30, V31 and V32, and the full-bridge circuit is used for rectifying the alternating voltage transmitted by the transformer T1 into direct current voltage.

2. A fault monitoring circuit for use in a modulator of a radar transmitter as claimed in claim 1, characterized in that The three-terminal voltage stabilizing power supply N6 outputs a 15V voltage for the optical fiber emitting head N5 and the secondary of the optical coupling.

3. A fault monitoring circuit for a radar transmitter modulator according to claim 2, characterised in that, The sampling circuit comprises resistors R53, R54 and R61, and the resistors R53, R54 and R61 are in series, and the primary of the optical coupling is connected in parallel at both ends of the resistor R61.

4. A fault monitoring circuit for use in a modulator of a radar transmitter as defined in claim 2, characterized in that ​ 5. A fault monitoring circuit for use in a modulator of a radar transmitter as defined in claim 1, characterized in that ​

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