Device for preventing data loss caused by power failure of recorder

Abstract

The utility model relates to the technical field of safety protection of electronic equipment, and discloses a device for preventing data loss caused by power failure of a recorder. The device comprises a power supply module and a master control module, the power supply module is used for converting a DC110V power supply provided by a train into a DC5V power supply required by other modules of the recorder, and the power supply module comprises a voltage conversion unit, a power failure detection unit and an energy storage capacitor. The voltage conversion unit realizes voltage conversion through a specific circuit element to ensure stable input of a power supply; the power failure detection unit detects a power failure condition by using a dual-channel differential comparator and sends out a signal; and the energy storage capacitor is used for prolonging the running time of the recorder during accidental power failure and ensuring data storage and safe shutdown of the system. According to the utility model, the problems of data loss and storage equipment damage caused by accidental power failure of the recorder are effectively solved, and the reliability and the stability of a vehicle-mounted recorder product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic equipment safety protection technical field discloses a device that prevents data loss caused by recorder power failure. BACKGROUND

[0002] The electronic equipment used on the train is often closed through the direct power-off mode. In order to reduce the write times of the storage device, the data recorder uses the memory as the cache when writing data, and writes into the storage device when the cache is full or timeout. Therefore, the multiple abnormal power failures may cause the data loss before power failure and even damage the storage device. The recorder product as a kind of vehicle-mounted electronic equipment currently often does not take special method to avoid this problem, resulting in the reliability reduction of vehicle-mounted recorder product. SUMMARY

[0003] In view of the above technical deficiencies, the utility model aims at providing a device that prevents data loss caused by recorder power failure, to solve the damage problem of recorder storage device caused by accidental power failure in the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] Firstly, the utility model provides a device that prevents data loss caused by recorder power failure, which comprises a power module and a master control module.

[0006] The power module is used to convert the DC 110V power supply obtained by the recorder from the train into the DC 5V power supply used by other modules of the recorder.

[0007] The master control module is used to be responsible for the operation system and the running of each application software.

[0008] The power module comprises a voltage conversion unit, a power failure detection unit and an energy storage capacitor.

[0009] The voltage conversion unit comprises a voltage conversion circuit, which is used to convert the DC 110V power supply into the DC 5V power supply.

[0010] The power failure detection unit comprises a power failure detection circuit, which is used to detect the occurrence of power failure and send a power failure signal.

[0011] The energy storage capacitor is used to prolong the running time after power failure.

[0012] Preferably, in a possible implementation form of the first aspect, the voltage conversion circuit comprises an EMC filter, a ceramic gas discharge tube, a variable resistor, a connector, a fuse, a diode, a DC / DC module power supply, a first electrolytic capacitor, a second electrolytic capacitor, a first capacitor, a second capacitor, a first ceramic capacitor, a second ceramic capacitor, a first resistor, and a light emitting diode.

[0013] Preferably, in a possible implementation form of the first aspect, the connector 1 interface, the 3 interface and the 4 interface are grounded, the 2 interface is connected to one end of the fuse, the other end of the fuse is connected to the EMC filter +Vin interface and one end of the variable resistor, the other end of the variable resistor is grounded, the EMC filter -Vin interface and the GND interface are grounded, and the two ends of the ceramic gas discharge tube are connected to the EMC filter -Vin interface and the GND interface, respectively.

[0014] The EMC filter +Vo interface is connected to one end of the first ceramic capacitor and the positive electrode of the diode, the other end of the first ceramic capacitor is connected to the DC / DC module power supply +Vo interface, the negative electrode of the diode is connected to the DC / DC module power supply Vin interface and the positive electrode of the first electrolytic capacitor, the negative electrode of the first electrolytic capacitor is connected to the EMC filter -Vo interface, the DC / DC module power supply GND interface and one end of the second ceramic capacitor, and the other end of the second ceramic capacitor is grounded.

[0015] The DC / DC module power supply +Vo interface is further connected to the positive electrode of the second electrolytic capacitor, one end of the first capacitor, one end of the second capacitor and one end of the first resistor, the negative electrode of the second electrolytic capacitor, the other end of the first capacitor and the other end of the second capacitor are grounded, the other end of the first resistor is connected to the positive electrode of the light emitting diode, the negative electrode of the light emitting diode is grounded, and the DC / DC module power supply 0V interface is grounded.

[0016] Preferably, in a possible implementation form of the first aspect, the power failure detection circuit comprises a dual-channel differential comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a third capacitor.

[0017] Preferably, in a possible implementation form of the first aspect, the dual-channel differential comparator VCC interface is connected to one end of the second resistor and one end of the third capacitor, the other end of the second resistor is connected to a 10V power supply, the other end of the third capacitor is grounded, the dual-channel differential comparator 1OUT interface is connected to one end of the third resistor, the other end of the third resistor is connected to a 4.7V power supply, the dual-channel differential comparator 1IN- interface is connected to the 4.7V power supply, the dual-channel differential comparator 1IN+ interface is connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is connected to a +110V power supply, the other end of the fifth resistor is grounded, and the dual-channel differential comparator GND interface is grounded.

[0018] Preferably, in one possible implementation of the first aspect, the main control module is also responsible for monitoring the power failure signal and performing data saving and system safety shutdown operations upon receiving the power failure signal.

[0019] The beneficial effects of this invention are as follows: It provides an effective solution to prevent data loss due to power failure of the recorder. By adding an energy storage capacitor and a power failure detection circuit, the recorder's operating time can be extended in the event of an unexpected power outage, ensuring that the system has sufficient time to complete data saving and safe system shutdown, thereby avoiding data loss and damage to the storage device. At the same time, the device has a simple structure, is easy to implement, and improves the reliability and stability of the vehicle recorder product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This application provides a device diagram for preventing data loss due to power failure of the recorder.

[0022] Figure 2 This application provides a 110V to 5V circuit diagram for a device to prevent data loss due to power failure of the recorder.

[0023] Figure 3 This application provides a 110V power failure detection circuit diagram for a device to prevent data loss due to power failure of the recorder. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1: As Figure 1 As shown, this utility model provides a device to prevent data loss due to power failure of the recorder. The device includes a power module and a main control module.

[0026] The power module is used for converting the DC 110V power obtained by the recorder from the train into DC 5V power used by other modules of the recorder; the main control module is used for being responsible for the operation of the operating system and each application software, and monitoring the drop signal; when the drop signal appears falling edge, the main control module starts to close the system; the power module comprises a voltage conversion unit, a drop detection unit and an energy storage capacitor.

[0027] The voltage conversion unit comprises a voltage conversion circuit used for converting the DC 110V power into DC 5V power; the drop detection unit comprises a drop detection circuit used for detecting the occurrence of the drop and sending the drop signal; the energy storage capacitor is used for prolonging the running time after the drop and ensuring the completion of the system closing.

[0028] As shown in Figure 2 The voltage conversion circuit comprises an EMC filter U2, a ceramic gas discharge tube GDT1, a variable resistor RV1, a connector J1, a fuse F1, a diode D1, a DC / DC module power supply U1, a first electrolytic capacitor CE1, a second electrolytic capacitor CE2, a first capacitor C1, a second capacitor C2, a first ceramic capacitor CY1, a second ceramic capacitor CY2, a first resistor R3 and a light emitting diode D2.

[0029] The 1 interface, the 3 interface and the 4 interface of the connector J1 are grounded, the 2 interface is connected with one end of the fuse F1, the other end of the fuse F1 is connected with a +Vin interface of the EMC filter U2 and one end of the variable resistor RV1, the other end of the variable resistor RV1 is grounded, a -Vin interface and a GND interface of the EMC filter U2 are grounded, the ceramic gas discharge tube GDT1 is connected with the -Vin interface and the GND interface of the EMC filter U2 respectively.

[0030] The +Vo interface of the EMC filter U2 is connected with one end of the first ceramic capacitor CY1 and the anode of the diode D1, the other end of the first ceramic capacitor CY1 is connected with a +Vo interface of the DC / DC module power supply U1, the cathode of the diode D1 is connected with a Vin interface of the DC / DC module power supply U1 and the anode of the first electrolytic capacitor CE1, the cathode of the first electrolytic capacitor CE1 is connected with a -Vo interface of the EMC filter U2, a GND interface of the DC / DC module power supply U1 and one end of the second ceramic capacitor CY2, the other end of the second ceramic capacitor CY2 is grounded.

[0031] The +Vo interface of the DC / DC module power supply U1 is also connected with the anode of the second electrolytic capacitor CE2, one end of the first capacitor C1, one end of the second capacitor C2 and one end of the first resistor R3, the cathode of the second electrolytic capacitor CE2, the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded, the other end of the first resistor R3 is connected with the anode of the light emitting diode D2, the cathode of the light emitting diode D2 is grounded, and the 0V interface of the DC / DC module power supply U1 is grounded.

[0032] EMC filter U2 is used to suppress electromagnetic interference on the power line, to ensure that the recorder power input is clean and stable, to filter out high-frequency noise and interference from the power grid, and to protect the internal electronic components of the recorder from damage. In this embodiment, an EMC filter of FC-C03D model is used.

[0033] The ceramic gas discharge tube GDT1 is a component used to protect the circuit from lightning strikes and overvoltage surges. When the voltage exceeds its breakdown voltage, the gas discharge tube will conduct, shorting the overvoltage to ground and thus protecting the circuit from damage. The ceramic gas discharge tube GDT1 uses a BORN_BTC201N model ceramic gas discharge tube. The variable resistor RV1 is used to adjust the parameters of the voltage conversion circuit, such as the output voltage or current limit. The variable resistor RV1 uses a 181K variable resistor. The connector J1 is the connection point between the circuit board and external devices, allowing the circuit board to connect with external power sources, sensors or other devices, enabling the circuit to work normally.

[0034] The fuse F1 is a component used to protect the circuit from overcurrent damage. When the current exceeds the rated value of the fuse, it will melt and thus cut off the circuit, preventing the current from continuing to flow and damaging other components in the circuit. Diode D1 is used as a protection component to prevent reverse voltage from damaging the circuit. Diode D1 uses a 1N4007 model diode. The DC / DC module power supply U1 is a device that converts one DC voltage to another DC voltage. In this embodiment, a URF1D_LD_40WR3 model DC / DC module power supply is used to convert the DC 110V power provided by the train into the DC 5V power required by the other modules of the recorder.

[0035] The first electrolytic capacitor CE1 and the second electrolytic capacitor CE2 are used for voltage smoothing at the input and output terminals, respectively. The capacitance values of the first electrolytic capacitor CE1 and the second electrolytic capacitor CE2 are 220 uF. The first capacitor C1 and the second capacitor C2 are used for high-frequency filtering and decoupling. The capacitance value of the first capacitor is 100 nF, and the capacitance value of the second capacitor is 10 nF. The first ceramic capacitor CY1 and the second ceramic capacitor CY2 are used for high-frequency filtering at the input and output terminals, respectively. The capacitance values of the first ceramic capacitor CY1 and the second ceramic capacitor CY2 are 2200 pF. The first resistor R3 is connected in series with the light-emitting diode D2 and is used as a power indicator light to indicate whether the power module is working normally. The resistance value of the first resistor is 1 .

[0036] As shown in Figure 3 , the power failure detection circuit includes a dual-channel differential comparator U5, a second resistor R6, a third resistor R7, a fourth resistor R11, a fifth resistor R12, and a third capacitor C8.

[0037] The VCC interface of the dual-channel differential comparator U5 is connected with one end of the second resistor R6 and one end of the third capacitor C8, the other end of the second resistor R6 is connected with a 10V power supply, the other end of the third capacitor C8 is grounded, the 1OUT interface of the dual-channel differential comparator U5 is connected with one end of the third resistor R7, the other end of the third resistor R7 is connected with a 4.7V power supply, the 1IN- interface of the dual-channel differential comparator U5 is connected with a 4.7V power supply, the 1IN+ interface of the dual-channel differential comparator U5 is connected with one end of the fourth resistor R11 and one end of the fifth resistor R12, the other end of the fourth resistor R11 is connected with a +110V power supply, the other end of the fifth resistor R12 is grounded, and the GND interface of the dual-channel differential comparator U5 is grounded.

[0038] The dual-channel differential comparator U5 is used for comparing the difference of two input voltages and outputting a logic signal according to the difference. In the embodiment, the dual-channel differential comparator of the type of LM393DGKR is adopted. The second resistor R6 and the third capacitor C8 form an RC filter circuit together, which is used for smoothing the power supply voltage and providing a stable power supply voltage for the VCC interface of the dual-channel differential comparator U5, the second resistor R6 adopts a 0R resistor, and the capacitance value of the third capacitor C8 is 100nF. The third resistor R7 is used as a voltage dividing resistor and is connected with the 1OUT interface of the dual-channel differential comparator U5, thereby providing a reference voltage for the 1OUT interface of U5 by being connected with a fixed voltage in series, the resistance value of the third resistor R7 is 1 %. The fifth resistor R12 and the fourth resistor R11 form a voltage dividing circuit together, which is used for dividing the power supply voltage of the recorder into the input range of U5, the resistance value of the fifth resistor R12 is 9.1 %, and the resistance value of the fourth resistor R12 is 100 %.

[0039] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model claims and the equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. An apparatus for preventing loss of data due to power failure of a recorder, characterized by, The device comprises a power module and a main control module; The power module is used to convert the DC 110V power obtained by the recorder from the train into DC 5V power used by other modules of the recorder; The main control module is used to be responsible for the operation system and the running of each application software; The power module comprises a voltage conversion unit, a power failure detection unit and an energy storage capacitor; The voltage conversion unit comprises a voltage conversion circuit used to convert the DC 110V power into DC 5V power; The voltage conversion circuit comprises an EMC filter, a ceramic gas discharge tube, a variable resistor, a connector, a fuse, a diode, a DC / DC module power supply, a first electrolytic capacitor, a second electrolytic capacitor, a first capacitor, a second capacitor, a first ceramic capacitor, a second ceramic capacitor, a first resistor and a light emitting diode; The connector 1 interface, 3 interface and 4 interface are grounded, the 2 interface is connected with one end of the fuse, the other end of the fuse is connected with the EMC filter +Vin interface and one end of the variable resistor, the other end of the variable resistor is grounded, the EMC filter -Vin interface and the GND interface are grounded, and the two ends of the ceramic gas discharge tube are connected with the EMC filter -Vin interface and the GND interface respectively; The EMC filter +Vo interface is connected with one end of the first ceramic capacitor and the positive electrode of the diode, the other end of the first ceramic capacitor is connected with the DC / DC module power supply +Vo interface, the negative electrode of the diode is connected with the DC / DC module power supply Vin interface and the positive electrode of the first electrolytic capacitor, the negative electrode of the first electrolytic capacitor is connected with the EMC filter -Vo interface, the DC / DC module power supply GND interface and one end of the second ceramic capacitor, and the other end of the second ceramic capacitor is grounded; The DC / DC module power supply +Vo interface is also connected with the positive electrode of the second electrolytic capacitor, one end of the first capacitor, one end of the second capacitor and one end of the first resistor, the negative electrode of the second electrolytic capacitor, the other end of the first capacitor and the other end of the second capacitor are grounded, the other end of the first resistor is connected with the positive electrode of the light emitting diode, and the negative electrode of the light emitting diode is grounded, and the DC / DC module power supply 0V interface is grounded; The power failure detection unit comprises a power failure detection circuit used to detect the occurrence of power failure and send a power failure signal; The power failure detection circuit comprises a double-channel differential comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a third capacitor; The double-channel differential comparator VCC interface is connected with one end of the second resistor and one end of the third capacitor, the other end of the second resistor is connected with a 10V power supply, the other end of the third capacitor is grounded, the double-channel differential comparator 1OUT interface is connected with one end of the third resistor, the other end of the third resistor is connected with a 4.7V power supply, the double-channel differential comparator 1IN- interface is connected with the 4.7V power supply, the double-channel differential comparator 1IN+ interface is connected with one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is connected with a +110V power supply, the other end of the fifth resistor is grounded, and the double-channel differential comparator GND interface is grounded; The energy storage capacitor is used to prolong the running time after power failure.

2. The apparatus for preventing loss of data due to power failure of a recording instrument as claimed in claim 1 wherein, The main control module is also responsible for monitoring the power failure signal and performing data saving and system safe closing operation after receiving the power failure signal.

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