CN216133178U - DC110V and DC48V insulation monitoring device - Google Patents
DC110V and DC48V insulation monitoring device Download PDFInfo
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- CN216133178U CN216133178U CN202121958479.1U CN202121958479U CN216133178U CN 216133178 U CN216133178 U CN 216133178U CN 202121958479 U CN202121958479 U CN 202121958479U CN 216133178 U CN216133178 U CN 216133178U
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Abstract
The utility model discloses a DC110V and DC48V insulation monitoring device, which mainly solves the problems of low leakage current sampling precision and low sampling rate of the existing insulation monitoring device, and the sensitivity of the whole monitoring device is low. The insulation monitoring device comprises a DSP (digital signal processor), and 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 which are connected with the DSP. According to the utility model, leakage current collection is carried out on DC110V and DC48V direct current outputs of the locomotive through the leakage current collection module, after a DSP processor processes collected signals, if relevant leakage current information is collected, warning is carried out through the alarm module, and insulation information display is carried out through the LCD display module. 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. Therefore, the method is suitable for popularization and application.
Description
Technical Field
The utility model relates to an insulation monitoring device, in particular to a DC110V and DC48V insulation monitoring device.
Background
With the great application of the direct current system in the fields of industry, civil use, energy sources and the like, the application of the direct current insulation monitoring device is also enlarged. With the development of science and technology, the locomotive is taken as one of the main transportation means for people to go out, and the running speed is faster and faster. With the increase of the speed of the locomotive, people are concerned about the safety performance of the locomotive more and more. The monitoring of the insulation resistance to ground of the direct current bus of the locomotive control loop is an important means for monitoring the safety of the locomotive.
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 a DC110V and DC48V insulation monitoring device, which mainly solves the problems of low leakage current sampling precision and low sampling rate of the existing insulation monitoring device, and the sensitivity of the whole monitoring device is low.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a DC110V and DC48V insulation monitoring device comprises a DSP processor, and a power supply module, an LCD display module, a leakage current acquisition module, an isolation unit, a clock unit and an alarm module which are connected with the DSP processor; the leakage current acquisition module comprises a resistor R1 connected with DC110V and DC48V direct current outputs, 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 R1 connected with the common end of the resistor R1 and the capacitor C1, a resistor R1, a capacitor C1 and a capacitor C1 which are connected with the other end of the resistor R1, an operational amplifier A1 with the positive phase input end connected with the other end of the capacitor C1, resistors R1 and R1 which are connected with the inverting input end of the operational amplifier A1, a resistor R1 connected with the output end of the operational amplifier A1, a triode VT1 with the emitter connected with the other end of the resistor R1, a voltage stabilizing diode D1 with the positive pole connected with the base of the triode VT1, a resistor R1 connected with the negative pole of the voltage stabilizing diode D1, an electrolytic capacitor C1 with the other end of the positive pole of the resistor R1, and a resistor R1 connected with the base of the VT 1; 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 grounding end of the resistor R9 is connected with DC110V and DC48V direct current output loops.
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 present invention, the alarm module includes a DC110V alarm and 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, leakage current collection is carried out on DC110V and DC48V direct current outputs of the locomotive through the leakage current collection module, after a DSP processor processes collected signals, if relevant leakage current information is collected, warning is carried out through the alarm module, and insulation information display is carried out through the LCD display module. 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 the 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 disclosed DC110V and DC48V insulation monitoring device includes a DSP processor, and a power module, an LCD display module, a leakage current collection module, an isolation unit, a clock unit and an alarm module connected to the DSP processor; the leakage current acquisition module comprises a resistor R1 connected with DC110V and DC48V direct current outputs, 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 R1 connected with the common end of the resistor R1 and the capacitor C1, a resistor R1, a capacitor C1 and a capacitor C1 which are connected with the other end of the resistor R1, an operational amplifier A1 with the positive phase input end connected with the other end of the capacitor C1, resistors R1 and R1 which are connected with the inverting input end of the operational amplifier A1, a resistor R1 connected with the output end of the operational amplifier A1, a triode VT1 with the emitter connected with the other end of the resistor R1, a voltage stabilizing diode D1 with the positive pole connected with the base of the triode VT1, a resistor R1 connected with the negative pole of the voltage stabilizing diode D1, an electrolytic capacitor C1 with the other end of the positive pole of the resistor R1, and a resistor R1 connected with the base of the VT 1; 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 grounding end of the resistor R9 is connected with DC110V and DC48V direct current output loops.
In the utility model, the chip used by the DSP processor is TMS320LF 2407. When the leakage current collection module collects leakage current of DC110V and DC48V direct current outputs of a locomotive, 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 comprises a DC110V warning device and 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, the leakage current collection module is used for collecting leakage current of DC110V and DC48V direct current outputs of the locomotive, the DSP processor is used for processing collected signals, and warning is carried out through the warning module if relevant leakage current information is collected, and meanwhile insulation information is displayed through the LCD display module. 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. A DC110V and DC48V insulation monitoring device is characterized by comprising 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 leakage current acquisition module comprises a resistor R1 connected with DC110V and DC48V direct current outputs, 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 R1 connected with the common end of the resistor R1 and the capacitor C1, a resistor R1, a capacitor C1 and a capacitor C1 which are connected with the other end of the resistor R1, an operational amplifier A1 with the positive phase input end connected with the other end of the capacitor C1, resistors R1 and R1 which are connected with the inverting input end of the operational amplifier A1, a resistor R1 connected with the output end of the operational amplifier A1, a triode VT1 with the emitter connected with the other end of the resistor R1, a voltage stabilizing diode D1 with the positive pole connected with the base of the triode VT1, a resistor R1 connected with the negative pole of the voltage stabilizing diode D1, an electrolytic capacitor C1 with the other end of the positive pole of the resistor R1, and a resistor R1 connected with the base of the VT 1; 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 grounding end of the resistor R9 is connected with DC110V and DC48V direct current output loops.
2. The insulation monitoring device for DC110V and DC48V 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 an X1 port, one end of the capacitor C5 is connected with an X2/CLKIN port, and the other ends of the capacitor C5 and the capacitor C6 are grounded.
3. The insulation monitoring device of DC110V and DC48V as claimed in claim 2, wherein the power supply module comprises a rectifier filter 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 insulation monitoring device of DC110V and DC48V as claimed in claim 3, wherein the 5V to 3.3V module comprises a voltage stabilizing chip with an input end connected with a filter inductor L2 and an output end connected with a DSP processor, a high-frequency filter C9 and a low-frequency filter C10 which are connected in parallel and then connected with the input end of the voltage stabilizing chip and grounded, and a high-frequency filter C11 and a low-frequency filter C12 which are connected in parallel and then connected with the output end of the voltage stabilizing chip and grounded.
5. The DC110V, DC48V insulation monitoring device of claim 4, wherein the 5V buck chip model is LM 2596T-5.0.
6. The DC110V, DC48V insulation monitoring device of claim 5, wherein the model number of the voltage stabilizing chip is AMS 1117-3.3.
7. The DC110V, DC48V insulation monitoring device as claimed in claim 6, wherein the alarm module comprises a DC110V alarm and a DC48V alarm.
8. The DC110V and DC48V insulation monitoring device of claim 7, wherein the chip used by the DSP processor is TMS320LF 2407.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121958479.1U CN216133178U (en) | 2021-08-18 | 2021-08-18 | DC110V and DC48V insulation monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121958479.1U CN216133178U (en) | 2021-08-18 | 2021-08-18 | DC110V and DC48V insulation monitoring device |
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| Publication Number | Publication Date |
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| CN216133178U true CN216133178U (en) | 2022-03-25 |
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| CN202121958479.1U Active CN216133178U (en) | 2021-08-18 | 2021-08-18 | DC110V and DC48V insulation monitoring device |
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