CN216160759U - AC380V insulation monitoring device - Google Patents
AC380V insulation monitoring device Download PDFInfo
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- CN216160759U CN216160759U CN202121941089.3U CN202121941089U CN216160759U CN 216160759 U CN216160759 U CN 216160759U CN 202121941089 U CN202121941089 U CN 202121941089U CN 216160759 U CN216160759 U CN 216160759U
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Abstract
The utility model discloses an AC380V insulation monitoring device, which mainly solves the problems of difficult insulation monitoring, low leakage current sampling precision and low sampling rate of a 380V high-voltage alternating-current power supply. The insulation monitoring device comprises a high-voltage rectification circuit, a DSP (digital signal processor), a power supply module, an LCD (liquid crystal display) module, a leakage current acquisition module, an isolation unit, a clock unit and an alarm module, wherein the power supply module, the LCD module, the leakage current acquisition module, the isolation unit, the clock unit and the alarm module are connected with the DSP; the output end of the high-voltage rectification circuit is connected with the leakage current acquisition module. According to the utility model, after the AC380V voltage is converted into direct current through the high-voltage rectifying circuit, the direct current output rectified by the leakage current collecting module is utilized for carrying out leakage current collection, after the DSP processor processes the collected signals, if relevant leakage current information is collected, the warning module is used for warning, and meanwhile, the LCD display module is used for displaying insulation information. Meanwhile, the circuit structure of the leakage current acquisition module is improved, so that the sampling precision is improved, and the sampling rate is increased.
Description
Technical Field
The utility model relates to an insulation monitoring device, in particular to an AC380V insulation monitoring device.
Background
The three-phase alternating current 380V/50Hz is a mainstream air-conditioning train power supply system on a current railway and provides power for various electric appliances on the train, and the AC380V is used based on the current state of the railway technical level of China at that time when the railway train in China starts to popularize the air-conditioning device in a large scale during the 1985-1989. Insulation monitoring of ac voltage is often performed by rectifying it into dc power.
The insulation monitoring device for the locomotive direct current power grid is an online detection device, can judge the insulation state of the direct current power grid in real time, and can give a warning when the ground insulation of a direct current bus of the power grid is reduced so as to avoid major accidents.
However, the existing railway locomotive insulation monitoring device also has the problems of low leakage current sampling precision and low sampling rate, which causes low sensitivity of the whole monitoring device. Secondly, the power module that only was grabbed in current insulation monitoring mostly has the problem that circuit structure is complicated, the design is reasonable inadequately for it is severe to generate heat in the whole monitoring devices use, and the DSP chip fragile is unfavorable for the saving in the user cost. Therefore, there is a need for improvement in such a situation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an AC380V insulation monitoring device, which mainly solves the problems of low sensitivity of the whole monitoring device caused by difficult insulation monitoring, low leakage current sampling precision and low sampling rate of a 380V high-voltage alternating-current power supply.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
an AC380V insulation monitoring device comprises a high-voltage rectification circuit, a DSP processor, a power supply module, an LCD display module, a leakage current acquisition module, an isolation unit, a clock unit and an alarm module, wherein the power supply module, the LCD display module, the leakage current acquisition module, the isolation unit, the clock unit and the alarm module are connected with the DSP processor; the output end of the high-voltage rectification circuit is connected with the leakage current acquisition module;
the high-voltage rectifying circuit comprises a diode D4, a diode D5, a diode D6, a diode D7, a resistor R11 and a resistor R12, wherein a bridge rectifying circuit is formed by the diode D4, the diode D5, the diode D6 and the diode D7; two ends of a loop of the AC380V current are respectively connected with two input ends of the bridge rectifier circuit; after the resistor R11 and the resistor R12 are connected in series, two ends of the resistor R11 and two ends of the resistor R12 are respectively connected with two output ends of the bridge rectifier circuit; the common end of the resistor R11 and the resistor R12 is used as a direct current output loop;
the leakage current acquisition module comprises a resistor R1 connected with the direct current output loop, a resistor R2 connected with one end of the resistor R1, a capacitor C1 connected with the other end of the resistor R1, a resistor R3 connected with the common end of the resistor R2 and the capacitor C1, a resistor R4, a capacitor C2 and a capacitor C3 which are connected with the other end of the resistor R3, an operational amplifier A2 with a positive phase input end connected with the other end of the capacitor C2, resistors R2 and R2 which are connected with the reverse phase input end of the operational amplifier A2, a resistor R2 connected with the output end of the operational amplifier A2, a triode VT 2 with an emitter connected with the other end of the resistor R2, a voltage stabilizing diode D2 with an anode connected with the base of the triode VT 2, a resistor R2 connected with a cathode of the voltage stabilizing diode D2, an electrolytic capacitor C2 with an anode connected with the other end of the resistor R2 and a resistor R2 connected with the base of the triode VT 2; the other end of the resistor R9, the negative electrode of the electrolytic capacitor C4 and the emitter of the triode VT1 are grounded, the collector of the triode VT1 is connected with the VCC pin of the DSP processor through the resistor R10, and the ground end of the resistor R9 is connected with the direct current output loop.
Further, in the utility model, the clock unit comprises a quartz crystal U1, a capacitor C5 and a capacitor C6, the quartz crystal U1 is connected in parallel between an X1 port and an X2/CLKIN port of the DSP processor, one end of the capacitor C6 is connected with the X1 port, one end of the capacitor C5 is connected with the X2/CLKIN port, and the other ends of the capacitor C5 and the capacitor C6 are grounded.
Further, in the utility model, the power module comprises a rectification filter module, a voltage reduction module and a 5V to 3.3V module; the rectification filter module is connected with VCC, and the rectification filter module, the voltage reduction module, the 5V-to-3.3V module and the DSP are sequentially connected; the voltage reduction module comprises a 5V voltage reduction chip connected with the rectification filter module through an anti-reverse diode D2, a filter capacitor C7, a discharge diode D3 and a filter inductor L2 which are all connected with the 5V voltage reduction chip, and a low-frequency filter capacitor C8 connected with the filter inductor L2; the filter inductor L2 is connected with a module for converting 5V into 3.3V.
Further, in the present invention, the 5V to 3.3V module includes a voltage stabilizing chip with an input terminal connected to the filter inductor L2 and an output terminal connected to the DSP processor, a high frequency filter C9 and a low frequency filter C10 connected in parallel and then connected to the input terminal of the voltage stabilizing chip and grounded, and a high frequency filter C11 and a low frequency filter C12 connected in parallel and then connected to the output terminal of the voltage stabilizing chip and grounded.
Further, in the utility model, the model of the 5V voltage reduction chip is LM 2596T-5.0.
Further, in the utility model, the model of the voltage stabilizing chip is AMS 1117-3.3.
Further, in the utility model, the alarm module is a DC110V alarm or a DC48V alarm.
Further, in the utility model, the chip used by the DSP processor is TMS320LF 2407.
Compared with the prior art, the utility model has the following beneficial effects:
(1) according to the utility model, after the AC380V voltage is converted into direct current through the high-voltage rectifying circuit, the direct current output of DC110V or DC48V rectified by the leakage current collecting module is utilized to collect leakage current, after the DSP processor processes the collected signals, if relevant leakage current information is collected, the warning module warns, and simultaneously, the LCD display module displays insulation information. Meanwhile, by improving the circuit structure of the leakage current acquisition module, a leakage current signal is firstly sampled and filtered through a filter circuit formed by a resistor R1, a resistor R2, a capacitor C1 and a resistor R3, and then is amplified by an amplifying circuit formed by a resistor R4, a capacitor C2, a capacitor C3, an operational amplifier A1, resistors R5 and a resistor R6 and then enters a rear current detection circuit to detect leakage current, so that insulation information is obtained. Therefore, the leakage current sampling precision of the whole leakage current module is improved, and the sampling rate is increased.
(2) The utility model improves the structure of the power module, and combines the voltage reduction chip and the voltage stabilization chip to design the peripheral circuit, thereby simplifying the overall structure of the circuit, reducing the volume of the chip, well realizing the voltage reduction and stabilization functions and prolonging the effective service life of the DSP chip.
(3) In the utility model, the voltage reduction module and the 5V to 3.3V module are both provided with the low-frequency filter capacitor and the high-frequency filter capacitor which are connected in parallel, in actual use, the low-frequency filter capacitor can filter most of low-frequency interference, and the high-frequency filter capacitor can filter a small part of high-frequency interference, so that the stability of power supply to the DSP chip is well ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic circuit diagram of a high-voltage rectification circuit and a leakage current collection module according to the present invention.
FIG. 3 is a schematic circuit diagram of a clock unit according to the present invention
Fig. 4 is a schematic diagram of a voltage-reducing module circuit with a voltage-reducing module according to the present invention.
FIG. 5 is a circuit diagram of a 5V to 3.3V module of the circuit module of the present invention
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1 and 2, the high-voltage rectifier circuit comprises a high-voltage rectifier circuit, a DSP processor, a power module, an LCD display module, a leakage current collection module, an isolation unit, a clock unit and an alarm module, wherein the power module, the LCD display module, the leakage current collection module, the isolation unit, the clock unit and the alarm module are connected with the DSP processor; the output end of the high-voltage rectification circuit is connected with the leakage current acquisition module.
The high-voltage rectifying circuit comprises a diode D4, a diode D5, a diode D6, a diode D7, a resistor R11 and a resistor R12, wherein a bridge rectifying circuit is formed by the diode D4, the diode D5, the diode D6 and the diode D7; two ends of a loop of the AC380V current are respectively connected with two input ends of the bridge rectifier circuit; after the resistor R11 and the resistor R12 are connected in series, two ends of the resistor R11 and two ends of the resistor R12 are respectively connected with two output ends of the bridge rectifier circuit; the common end of the resistor R11 and the resistor R12 is used as a direct current output loop.
The leakage current acquisition module comprises a resistor R1 connected with the direct current output loop, a resistor R2 connected with one end of the resistor R1, a capacitor C1 connected with the other end of the resistor R1, a resistor R3 connected with the common end of the resistor R2 and the capacitor C1, a resistor R4, a capacitor C2 and a capacitor C3 which are connected with the other end of the resistor R3, an operational amplifier A2 with a positive phase input end connected with the other end of the capacitor C2, resistors R2 and R2 which are connected with the reverse phase input end of the operational amplifier A2, a resistor R2 connected with the output end of the operational amplifier A2, a triode VT 2 with an emitter connected with the other end of the resistor R2, a voltage stabilizing diode D2 with an anode connected with the base of the triode VT 2, a resistor R2 connected with a cathode of the voltage stabilizing diode D2, an electrolytic capacitor C2 with an anode connected with the other end of the resistor R2 and a resistor R2 connected with the base of the triode VT 2; the other end of the resistor R9, the negative electrode of the electrolytic capacitor C4 and the emitter of the triode VT1 are grounded, the collector of the triode VT1 is connected with the VCC pin of the DSP processor through the resistor R10, and the ground end of the resistor R9 is connected with the direct current output loop.
In the utility model, the chip used by the DSP processor is TMS320LF 2407. When the insulation monitoring is carried out on AV380 alternating current output, firstly, the voltage is rectified into DC110V or DC48, the alternating current is changed into direct current, leakage current collection is carried out on the DC110V or DC48V direct current output of a locomotive by utilizing a leakage current collection module, after a DSP processor processes collected signals, if relevant leakage current information is collected, warning is carried out through a warning module, the warning module is a C110V warning device or a DC48V warning device, the two warning devices are respectively used for DC110V and DC48V output leakage current warning, and an LCD display module carries out insulation information display. Meanwhile, by improving the circuit structure of the leakage current acquisition module, a leakage current signal is firstly sampled and filtered through a filter circuit formed by a resistor R1, a resistor R2, a capacitor C1 and a resistor R3, and then is amplified by an amplifying circuit formed by a resistor R4, a capacitor C2, a capacitor C3, an operational amplifier A1, resistors R5 and a resistor R6 and then enters a rear current detection circuit to detect leakage current, so that insulation information is obtained. Therefore, the leakage current sampling precision of the whole leakage current module is improved, and the sampling rate is increased.
In the utility model, as shown in fig. 3, the clock unit includes a quartz crystal U1, a capacitor C5 and a capacitor C6, the quartz crystal U1 is connected in parallel between an X1 port and an X2/CLKIN port of the DSP processor, one end of a capacitor C6 is connected to the X1 port, one end of a capacitor C5 is connected to the X2/CLKIN port, and the other ends of the capacitor C5 and the capacitor C6 are grounded. The clock unit is used for providing clock signals for the TMS320LF2407 chip.
In the utility model, as shown in fig. 4, the power supply module includes a rectification filter module, a voltage reduction module, and a 5V to 3.3V module; the rectification filter module is connected with VCC, and the rectification filter module, the voltage reduction module, the 5V-to-3.3V module and the DSP are sequentially connected; the voltage reduction module comprises a 5V voltage reduction chip connected with the rectification filter module through an anti-reverse diode D2, a filter capacitor C7, a discharge diode D3 and a filter inductor L2 which are all connected with the 5V voltage reduction chip, and a low-frequency filter capacitor C8 connected with the filter inductor L2; the filter inductor L2 is connected with a module for converting 5V into 3.3V. Wherein the 5V pressure reduction chip is LM2596T-5.0 in model. Meanwhile, the rectification filter module is an existing circuit module, and the specific construction and the working principle thereof are not described in detail herein.
In the utility model, as shown in fig. 4, the 5V to 3.3V module includes a voltage stabilizing chip with an input terminal connected to the filter inductor L2 and an output terminal connected to the DSP processor, a high frequency filter C9 and a low frequency filter C10 connected in parallel and then connected to the input terminal of the voltage stabilizing chip and grounded, and a high frequency filter C11 and a low frequency filter C12 connected in parallel and then connected to the output terminal of the voltage stabilizing chip and grounded. Wherein the model of the voltage stabilizing chip is AMS 1117-3.3. In actual work, the low-frequency filter capacitor can filter most low-frequency interference, and the high-frequency filter capacitor can filter a small part of high-frequency interference, so that the stability of power supply to the DSP chip is well ensured.
Through the design, after the AC380V voltage is converted into direct current through the high-voltage rectifying circuit, the direct current output of DC110V or DC48V rectified by the leakage current collecting module is used for collecting leakage current, after the DSP processor processes the collected signals, if relevant leakage current information is collected, the warning module is used for warning, and meanwhile, the LCD display module is used for displaying insulation information. Meanwhile, the circuit structure of the leakage current acquisition module is improved, so that the leakage current sampling precision of the whole leakage current module is improved, and the sampling rate is increased. Thus, the present invention provides substantial features and improvements over the prior art.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (8)
1. An AC380V insulation monitoring device is characterized by comprising a high-voltage rectification circuit, a DSP processor, a power supply module, an LCD display module, a leakage current acquisition module, an isolation unit, a clock unit and an alarm module, wherein the power supply module, the LCD display module, the leakage current acquisition module, the isolation unit, the clock unit and the alarm module are connected with the DSP processor; the output end of the high-voltage rectification circuit is connected with the leakage current acquisition module;
the high-voltage rectifying circuit comprises a diode D4, a diode D5, a diode D6, a diode D7, a resistor R11 and a resistor R12, wherein a bridge rectifying circuit is formed by the diode D4, the diode D5, the diode D6 and the diode D7; two ends of a loop of the AC380V current are respectively connected with two input ends of the bridge rectifier circuit; after the resistor R11 and the resistor R12 are connected in series, two ends of the resistor R11 and two ends of the resistor R12 are respectively connected with two output ends of the bridge rectifier circuit; the common end of the resistor R11 and the resistor R12 is used as a direct current output loop;
the leakage current acquisition module comprises a resistor R1 connected with the direct current output loop, a resistor R2 connected with one end of the resistor R1, a capacitor C1 connected with the other end of the resistor R1, a resistor R3 connected with the common end of the resistor R2 and the capacitor C1, a resistor R4, a capacitor C2 and a capacitor C3 which are connected with the other end of the resistor R3, an operational amplifier A2 with a positive phase input end connected with the other end of the capacitor C2, resistors R2 and R2 which are connected with the reverse phase input end of the operational amplifier A2, a resistor R2 connected with the output end of the operational amplifier A2, a triode VT 2 with an emitter connected with the other end of the resistor R2, a voltage stabilizing diode D2 with an anode connected with the base of the triode VT 2, a resistor R2 connected with a cathode of the voltage stabilizing diode D2, an electrolytic capacitor C2 with an anode connected with the other end of the resistor R2 and a resistor R2 connected with the base of the triode VT 2; the other end of the resistor R9, the negative electrode of the electrolytic capacitor C4 and the emitter of the triode VT1 are grounded, the collector of the triode VT1 is connected with the VCC pin of the DSP processor through the resistor R10, and the ground end of the resistor R9 is connected with the direct current output loop.
2. The AC380V insulation monitoring device of claim 1, wherein the clock unit comprises a quartz crystal U1, a capacitor C5 and a capacitor C6, the quartz crystal U1 is connected in parallel between an X1 port and an X2/CLKIN port of the DSP processor, one end of the capacitor C6 is connected with the X1 port, one end of the capacitor C5 is connected with the X2/CLKIN port, and the other ends of the capacitor C5 and the capacitor C6 are grounded.
3. The AC380V insulation monitoring device according to claim 2, wherein the power supply module comprises a rectifying and filtering module, a voltage reduction module, a 5V to 3.3V module; the rectification filter module is connected with VCC, and the rectification filter module, the voltage reduction module, the 5V-to-3.3V module and the DSP are sequentially connected; the voltage reduction module comprises a 5V voltage reduction chip connected with the rectification filter module through an anti-reverse diode D2, a filter capacitor C7, a discharge diode D3 and a filter inductor L2 which are all connected with the 5V voltage reduction chip, and a low-frequency filter capacitor C8 connected with the filter inductor L2; the filter inductor L2 is connected with a module for converting 5V into 3.3V.
4. The AC380V insulation monitoring device according to claim 3, wherein the 5V to 3.3V module comprises a filter inductor L2 connected to the input end, a voltage stabilizing chip connected to the DSP processor at the output end, a high frequency filter C9 and a low frequency filter C10 connected in parallel and then connected to the input end of the voltage stabilizing chip and connected to the ground, and a high frequency filter C11 and a low frequency filter C12 connected in parallel and then connected to the output end of the voltage stabilizing chip and connected to the ground.
5. The AC380V insulation monitoring device of claim 4, wherein the 5V buck chip is LM 2596T-5.0.
6. The AC380V insulation monitoring device of claim 5, wherein the voltage regulation chip is AMS 1117-3.3.
7. The AC380V insulation monitoring device as claimed in claim 6, wherein the alarm module is a DC110V alarm or a DC48V alarm.
8. The AC380V insulation monitoring device according to claim 7, wherein the chip used by the DSP processor is TMS320LF 2407.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121941089.3U CN216160759U (en) | 2021-08-18 | 2021-08-18 | AC380V insulation monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121941089.3U CN216160759U (en) | 2021-08-18 | 2021-08-18 | AC380V insulation monitoring device |
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| Publication Number | Publication Date |
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| CN216160759U true CN216160759U (en) | 2022-04-01 |
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| CN202121941089.3U Active CN216160759U (en) | 2021-08-18 | 2021-08-18 | AC380V insulation monitoring device |
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2021
- 2021-08-18 CN CN202121941089.3U patent/CN216160759U/en active Active
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