WO2013189197A1

WO2013189197A1 - Protection circuit, control method therefor, and telecommunication subrack equipment

Info

Publication number: WO2013189197A1
Application number: PCT/CN2013/073428
Authority: WO
Inventors: 彭学文; 卞康; 黄世魁
Original assignee: 华为技术有限公司
Priority date: 2012-06-19
Filing date: 2013-03-29
Publication date: 2013-12-27
Also published as: CN103022968A

Abstract

A protection circuit, a control method therefor, and telecommunication subrack equipment. The protection circuit comprises: a sampling module (10) for sampling from an equipment power supply loop to acquire a sampling signal, the equipment power supply loop being a circuit between a power supply (20) in telecommunication subrack equipment and at least one slot (30) arranged in the telecommunication subrack equipment; a processing module (11) for accumulating and retaining the sampling signal to acquire a corresponding charging voltage after the sampling signal has been accumulated; a judgment module (12) for comparing the charging voltage with a preset reference voltage, and when the difference of the charging voltage and the preset reference voltage is less than or equal to a preset threshold, sending a control signal to a drive module; and a drive module (13) for receiving the control signal sent by the judgment module and cutting off the equipment power supply loop according to the control signal. The protection circuit can rapidly extinguish an arc, avoid the convergence and enhancement of arcing energy, avoid the occurrence of fire accidents, and enhance the safety of telecommunication subrack equipment.

Description

Protection circuit and control method thereof, telecommunication frame equipment

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a protection circuit, a control method thereof, and a telecommunications frame device. Background technique

Telecom telecommunications equipment is a common device in the field of communications.

Telecom telecommunications equipment usually uses DC power, and usually uses a power supply to supply power. The backplane of the telecom frame device has multiple slots for plugging in the board (it can also be a card). The power supply is connected to the board connected to each slot through the backplane connector to supply power to each board. If the boards in the slot are the same, the boards in each slot are the same, that is, when the power consumption is evenly divided, the current flowing through each board is M. The flow capacity is NM, the protection device of the power supply, such as air-opening or fuse usually considers derating, its action value is often Y times of the rated current (Y is greater than 1), so if you consider 1+1 power backup, the first level is empty. The current rating of the open or fuse is 2YNM.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: When there is contamination (such as foreign matter, etc.) on the back plate pins, and the pins with the pressure difference are drawn (ie, a fault arc occurs), The arc current is far from the open or the protection point of the fuse. The protection device of the power supply will not work, and the arcing will increase the energy concentration, which will cause a fire. Summary of the invention

The embodiment of the invention provides a protection circuit, a control method thereof, and a telecommunications enclosure device, which are used to improve the security of the telecommunications enclosure device.

In one aspect, an embodiment of the present invention provides a protection circuit, including:

The sampling module is connected to the power supply circuit of the device, and is used for sampling from the power supply circuit of the device to obtain a sample signal; the power supply circuit of the device is set in the power supply and the telecommunications frame device in the telecom frame device. a circuit between at least one slot;

a processing module, connected to the sampling module, configured to accumulate and protect the sample signal Holding, obtaining a corresponding charging voltage after the sample signal is accumulated;

a judging module, configured to be connected to the processing module, configured to compare the charging voltage with a preset reference voltage, and when a difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold, Sending a control signal to the drive module;

The driving module is connected to the determining module, and configured to receive the control signal sent by the determining module, and cut off the power supply circuit of the device according to the control signal.

In another aspect, the embodiment of the present invention further provides a telecommunications subrack device, including: at least one power source and a backplane provided with at least one slot; each slot is used for plugging a single board; the at least one power source Connected to the at least one slot, respectively, to supply power to the board that is inserted in each slot; and provide protection as described above in a device power supply circuit between the power source and the at least one slot Circuit.

In a further aspect, the embodiment of the present invention further provides a control method for a protection circuit, including: obtaining a sample signal from a power supply loop of the device; the power supply loop of the device is a power supply and a telecommunications enclosure in the telecommunications enclosure device. a circuit between at least one slot set in the device; accumulating and maintaining the sample signal to obtain a corresponding charging voltage after the sample signal is accumulated;

Comparing the charging voltage with a preset reference voltage, and issuing a control signal when a difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold;

The device power supply circuit is cut off according to the control signal.

The protection circuit, the control method thereof and the telecommunication frame device of the embodiment of the invention acquire the sample-like signal by using the sampling module from the power supply circuit of the device; the processing module accumulates and holds the sample signal, and obtains the sample. The charging voltage corresponding to the signal; the determining module compares the charging voltage with the preset reference voltage, and sends a control signal to the driving module when the difference between the charging voltage and the preset reference voltage is less than or equal to the preset threshold; the driving module is configured according to The control signal cuts off the power supply loop of the device.技术In the technical solution of the embodiment of the present invention, when there is pollution (such as foreign matter, etc.) on the back plate pins, and the pins with the pressure difference are arced (that is, a fault arc occurs), when the arc current is far from reaching the open or the fuse The protection point, but because the fault arc is pulsed, the arc current is sharp, the processing module can quickly charge with the spike of the arc current, and when the judgment module determines the charging voltage and the preset reference voltage When the difference is greater than or equal to the preset threshold, a control signal is sent to the driving module, and the driving module cuts off the power supply circuit of the device according to the control signal, thereby being able to quickly Extinguish the arc, avoid the increase of the arc energy convergence, and avoid the fire. The protection circuit of the embodiment of the present invention and the control method thereof can enhance the security of use of the telecommunications subrack device. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.

FIG. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a protection circuit according to another embodiment of the present invention.

FIG. 3 is a circuit diagram of a protection circuit according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a telecommunications subrack device according to an embodiment of the present invention.

FIG. 5 is a circuit diagram of the telecommunications enclosure device shown in FIG.

FIG. 6 is a flowchart of a method for controlling a protection circuit according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention. As shown in FIG. 1, the protection circuit of this embodiment may specifically include: a sample module 10, a processing module 11, a determination module 12, and a drive module 13.

The sampling module 10 is connected to the power supply circuit of the device, and is used to obtain a sample signal from the power supply circuit of the device. The power supply circuit of the device is at least one slot set in the power supply and the telecommunications frame device of the telecom subrack device. The circuit between the boards in the slots of the power supply in the telecom frame device is powered.

The processing module 11 is connected to the sample module 10, and the processing module 1 1 is configured to accumulate and hold the sample signal obtained by the sample module 10, and obtain the corresponding charging power after the sample signal is accumulated. Pressure

The judging module 12 is connected to the processing module 11, and the judging module 12 is configured to compare the charging voltage obtained by the processing module 11 with a preset reference voltage, and when the difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold. Sending a control signal to the driving module 13;

The driving module 13 is connected to the judging module 12, and the driving module 13 is configured to receive the control signal sent by the judging module 12, and cut off the power supply circuit of the device according to the control signal.

The protection circuit of the embodiment obtains a sample signal by sampling the sample power supply circuit by using the sample module; the processing module accumulates and holds the sample signal, and obtains a corresponding charging voltage after the sample signal is accumulated; The module compares the charging voltage with a preset reference voltage, and sends a control signal to the driving module when the difference between the charging voltage and the preset reference voltage is greater than or equal to a preset threshold; the driving module cuts off the power supply circuit of the device according to the control signal.釆 With the technical solution of the embodiment, when there is contamination (such as foreign matter, etc.) on the back plate pins, and the pin with the pressure difference is pulled (ie, a fault arc occurs), when the arc current is far from reaching the open or the fuse Protection point, but because the fault arc is pulsed, the arc current is sharp, the processing module can quickly charge with the spike of the arc current, and when the judgment module determines the difference between the charging voltage and the preset reference voltage When the value is less than or equal to the preset threshold, a control signal is sent to the driving module, and the driving module cuts off the power supply circuit of the device according to the control signal, thereby enabling rapid arc extinguishing, avoiding the increase of the arc energy convergence, and avoiding the occurrence of fire. By using the protection circuit of this embodiment, the security of the use of the telecommunications enclosure device can be enhanced.

FIG. 2 is a schematic structural diagram of a protection circuit according to another embodiment of the present invention. As shown in FIG. 2, the protection circuit of this embodiment may further include the following optional technical solutions on the basis of the foregoing embodiment shown in FIG.

The sampling module 10 in the protection circuit of the present embodiment includes a sampling unit 101 and a differential amplifier 102. The sampling unit 101 is connected to the power supply circuit of the device, and the sampling unit 101 is configured to obtain the initial sampling signal at both ends of the sampling unit 101 from the power supply circuit of the device. The differential amplifier 102 is connected to the sampling unit 101 for The initial sample signal at both ends of the sample unit 101 is differentially amplified to obtain a sample signal. For example, the sample unit 101 in this embodiment is implemented by a sample resistor or a current transformer. In an actual application, the initial sampling signals at both ends of the sampling unit 101 obtained by the sampling unit 101 are respectively connected to the input positive pole and the input negative pole of the differential amplifier 102, and the differential amplifier 102 receives the sampling unit received from the input positive pole and the input negative pole. Initial at both ends of 101 The sample-like signal is subjected to differential amplification processing to obtain a sample-like signal, that is, a sample-like voltage. Due to the arc current, it is usually due to contamination (such as foreign matter) on the back plate pins. In order to effectively detect the voltage change caused by the fault arc, it is necessary to amplify the sample signal to accurately check 'J.

Further, in the protection circuit of the embodiment, the processing module 11 includes a diode 11 1 and a capacitor 112; wherein the diode 11 is connected to the differential amplifier 102, and the diode 11 1 is used to perform the differential amplification processing of the sample signal. Rectification processing; one end of the capacitor 112 is connected to the diode 1 11 , and the other end of the capacitor 1 12 is grounded (not shown); the capacitor 112 is used to accumulate and hold the sample-like signal rectified by the diode 111 to the capacitor 112 When charging is performed, the voltage at one end of the capacitor 1 12 is the charging voltage corresponding to the sample-like signal, that is, the corresponding charging voltage is obtained after the sampling signal is accumulated at one end of the capacitor 112.

Further, in the protection circuit of the embodiment, the processing unit 11 further includes a first resistor 113, which is connected in series between the tube 111 and the capacitor 112 for reducing noise in the circuit.

Further, in the protection circuit of the embodiment, the determining module 12 can be implemented by using a comparator; the negative pole of the comparator (for example, the anode of the comparator capacitor) is connected to one end of the capacitor to obtain the charging voltage of the capacitor 112; The negative pole of the comparator (for example, the comparator is connected to the positive pole of the preset reference voltage) is connected to a preset reference voltage, and the comparator is used to compare the charging voltage with a preset reference voltage, and when the charging voltage is preset with reference When the difference between the voltages is less than or equal to the preset threshold, a control signal is sent to the driving module 13.

Further, in the protection circuit of the embodiment, the driving module 13 is connected to the output end of the comparator, and is configured to receive the output of the comparator when the difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold. The control signal, and according to the control signal, turns off the switch tube in the power supply circuit of the device. The drive module 13 can be implemented using a drive circuit.

For example, the switch tube in the power supply circuit of the device is a MoS tube, or a relay, or a contactor. Further, in the protection circuit of the embodiment, the processing module 11 may further include a second resistor 114, which is connected in parallel across the capacitor 112. For example, after the driving module 13 turns off the switching tube in the power supply circuit of the device, since the capacitor 112 still maintains a high voltage, in order to discharge the capacitor 112 in time, the second resistor 114 may be connected to both ends of the capacitor 112. The capacitor 112 can be reconnected to the ground of the other end of the capacitor 112 through the resistor 114 to form a loop for discharging the capacitor 12 in time.

It should be noted that the capacitor 112, the first resistor 113, and the second resistor 114 in this embodiment The size can be set according to the input voltage of the telecom frame device, the input current, the current variable under fault conditions, and the current variable under normal operation.

It should be noted that the embodiment shown in FIG. 2 is a technical solution that introduces all the optional technical solutions described above as an example. In practical applications, there is an optional technical solution, and any combination can be used. Any combination of the modes forms an optional technical solution of the embodiment of the present invention, and is not enumerated here.

In the protection circuit of the embodiment, when the above structure is used, when the pin on the back plate pins is contaminated (such as foreign matter), the pin having a pressure difference is drawn (ie, a fault arc occurs), when the arc current is far from reaching. The open or fuse protection point, but because the fault arc is pulsed, the arc current is sharp, and the capacitor can be quickly charged by the spike of the arc current, and the comparator determines the charging voltage and the preset. When the difference of the reference voltage is less than or equal to the preset threshold, a control signal is sent to the driving module, and the driving module cuts off the switching tube of the power supply circuit of the device according to the control signal, thereby quickly extinguishing the arc, avoiding the enhancement of the arc energy convergence, and avoiding the fire. appear. The protection circuit of the embodiment can enhance the security of use of the telecommunications enclosure equipment.

FIG. 3 is a circuit diagram of a protection circuit according to an embodiment of the present invention. As shown in Fig. 3, the protection circuit of this embodiment details the protection circuit shown in Fig. 2 in the form of a physical component.

As shown in FIG. 3, in this embodiment, a voltage of 48V is input in the power supply circuit of the device as an example, and the sample resistor R is connected in series in the power supply circuit of the device. In this embodiment, the input resistor R is connected in series with the input of the power supply circuit of the device. In the power circuit, the RTN (ie, RETURN) in Figure 3 represents the output power circuit to form a device power supply loop with the input power circuit. The initial sample signal is obtained from the two ends of the sample resistor R, that is, the initial sample voltage, and the initial sample signal at both ends of the sample resistor R is input from the input positive electrode of the differential amplifier U and the input negative input to the differential amplifier U, respectively. The amplifier U performs differential amplification processing on the two ends of the sample resistor R to obtain an initial sample signal, and outputs a signal for differential amplification processing. The diode D rectifies the differentially amplified sampled signal, and then the first resistor R1 performs noise reduction processing on the rectified sample signal, and then the sample signal (ie, the voltage used) is from the capacitor C. Capacitor C is charged at one end, and the other end of capacitor C is grounded. The input positive pole of the comparator V is connected to a preset reference voltage, and the input negative pole of the comparator V is connected to the non-ground terminal of the capacitor C, that is, the voltage of the input negative pole of the comparator V is the accumulated and maintained charging voltage on the capacitor C. As the capacitor C is charged, the voltage of the negative terminal of the comparator V (ie, the charging voltage) is continuously increased. When the charging voltage is increased to a preset reference value that is different from the preset reference voltage of the positive electrode of the comparator V, Comparator V output drive The dynamic circuit W issues a control signal, and the drive circuit W turns off the switch κ in the power supply circuit of the device according to the control signal.

As shown in FIG. 3, the second resistor R2 is connected in parallel across the capacitor C. After the driving circuit W turns off the switching transistor, the voltage on the capacitor C is discharged through the second resistor R2, and rapidly drops to 0, thereby avoiding the fault arc. After the switch is closed, the circuit can be quickly restored to normal after the switch is closed. Otherwise, if there is no second resistor R2, capacitor C cannot be discharged quickly. After the arc fault is removed, after the switch is closed, the charging voltage on capacitor C is still high, which may cause comparator V to generate a control signal again. The switch circuit W is turned off again by the drive circuit W according to the control signal, and the power supply circuit of the device cannot be quickly restored to normal.

When the protection circuit of the embodiment is in use, when there is contamination (such as foreign matter) on the back plate pins, the pins with the pressure difference are arced (ie, a fault arc occurs), and the arc current is far from being open or fuse. Protection point, when the protection device of the power supply is not working, the voltage in the power supply circuit of the device will change. In order to facilitate the subsequent comparator V to send a control signal to the drive circuit W in time, the drive circuit W turns off the power supply according to the control signal in time. The switching transistor in the loop, the differential amplifier in this embodiment can amplify the sample signal, for example, when the arc is generated, it may only produce a 0.1V change to the voltage in the power supply loop of the device, but due to the voltage change value Too small, the corresponding charging voltage is small, and the corresponding preset reference voltage value is also small. A slight change in the charging voltage value may cause the comparator V to output a control signal, resulting in instability of the protection circuit and control accuracy. Poor. Because the stability of the protection circuit and the control precision are ensured, the differential amplifier U is used to amplify a certain ratio of the signal for use, so that the subsequent comparator V can output an accurate control signal, ensure the stability of the protection circuit, and improve the control of the protection circuit. Precision.

In the protection circuit of the embodiment, when the above structure is used, when the pin on the back plate pins is contaminated (such as foreign matter), the pin having a pressure difference is drawn (ie, a fault arc occurs), when the arc current is far from reaching. The open or fuse protection point, but because the fault arc is pulsed, the arc current is sharp, and the capacitor can be quickly charged by the spike of the arc current, and the comparator determines the charging voltage and the preset. When the difference of the reference voltage is less than or equal to the preset threshold, a control signal is sent to the driving module, and the driving module cuts off the switching tube of the power supply circuit of the device according to the control signal, thereby quickly extinguishing the arc, avoiding the enhancement of the arc energy convergence, and avoiding the fire. appear. With the protection circuit of the embodiment, the use security of the telecommunications enclosure device can be enhanced. FIG. 4 is a schematic structural diagram of a telecommunications subrack device according to an embodiment of the present invention. As shown in FIG. 4, the telecommunications subrack device of this embodiment includes: at least one power source 20, when at least two power sources 20 are included, each power source 20 can be backed up with each other, so that when one of the power sources 20 fails, The backup power supply 20 operates immediately to replace the failed power supply 20 with an uninterrupted position to provide power to the telecommunications enclosure equipment. As shown in FIG. 4, in the embodiment, two power sources 20 are included in the telecommunications frame device as an example. As shown in FIG. 4, the telecommunications subrack device of the present embodiment is further provided with a backplane 40 of at least one slot 30, and the two power supplies 20 are mutually backed up; each slot 30 is used for plugging a single board; 20 is connected to at least one slot 30 to supply power to the boards connected to the slots 30. In this embodiment, a protection circuit 50 is disposed in the power supply circuit between the power source 20 and the at least one slot 30. For the protection circuit, the protection circuit described in any of the above embodiments may be used. For details, refer to the description of the foregoing embodiment, and details are not described herein again.

Figure 5 is a circuit diagram of the telecommunications enclosure device shown in Figure 4. The two power supplies are the power supply A and the power supply B. In the telecom subrack device shown in Figure 5, the N slots are set on the backplane. The power supply loop between each power supply and slot is used. The protection circuit is provided in FIG. 5, and the protection circuit described in any of the above embodiments may be used. For details, refer to the description of the foregoing embodiment, and details are not described herein again. Other parts than the protection circuit shown in FIG. 5 can be referred to the related art in detail, and details are not described herein again.

The telecommunications frame device of the embodiment can use the above protection circuit to generate a arc current when a pin with a pressure difference is drawn (ie, a fault arc occurs) due to contamination (such as foreign matter) on the back plate pins. Far from reaching the protection point of the open or fuse, but because the fault arc is pulsed, the spike of the arc current is large, and the capacitor can be quickly charged by the spike of the arc current, and the comparator determines the charging voltage. When the difference between the preset reference voltage and the preset reference voltage is less than or equal to the preset threshold, the control module sends a control signal to the driving module, and the driving module cuts off the switching tube of the power supply circuit of the device according to the control signal, thereby rapidly extinguishing the arc and avoiding the enhancement of the arc energy convergence. Avoid the appearance of a fire. With the protection circuit of the embodiment, the use security of the telecommunications enclosure device can be enhanced.

FIG. 6 is a flowchart of a method for controlling a protection circuit according to an embodiment of the present invention. As shown in FIG. 6, the control method of the protection circuit of this embodiment may specifically include the following steps:

100. Obtaining a sample signal from the power supply circuit of the device;

The power supply circuit of the device in this embodiment is a circuit between the power source in the telecommunications frame device and at least one slot set in the telecommunications frame device. 101. For the 釆^言号 into the ^ only tired and maintain, obtain the corresponding charging voltage after the 言^言号 is accumulated;

102. Compare the charging voltage with a preset reference voltage, and issue a control signal when a difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold.

In this embodiment, when the difference between the charging voltage and the preset reference voltage is greater than a preset threshold, no operation is performed.

103. Cut off the power supply circuit of the device according to the control signal.

The execution body of the control method of the protection circuit of the present embodiment may be a protection circuit, and may be, for example, a protection circuit as described in any of the embodiments shown in the above Figures 1 to 3.

The control method of the protection circuit of the embodiment is the same as that of the protection circuit of the related embodiment. For details, refer to the description of the related embodiments, and details are not described herein again.

The control method of the protection circuit of the embodiment obtains a sample-like signal by sampling from the power supply circuit of the device; accumulating and maintaining the sample-like signal, and obtaining a corresponding charging voltage after the sample-like signal is accumulated; charging the voltage and the pre-charge The reference voltage is compared, and when the difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold, a control signal is issued; and the power supply circuit of the device is cut off according to the control signal.釆 With the technical solution of the embodiment, when there is contamination (such as foreign matter, etc.) on the back plate pins, and the pin with the pressure difference is pulled (ie, a fault arc occurs), when the arc current is far from reaching the open or the fuse Protection point, but because the fault arc is pulsed, the arc current is sharp, and it can be quickly charged by the spike of the arc current, and when the difference between the charging voltage and the preset reference voltage is determined to be less than or equal to When the threshold is set, the control signal is issued, and the power supply circuit of the device is cut off according to the control signal, so that the arc extinguishing can be quickly performed, the arc energy convergence can be prevented from being enhanced, and the fire can be avoided. With the protection circuit of this embodiment, the security of use of the telecommunications enclosure equipment can be enhanced.

Optionally, on the basis of the foregoing embodiment shown in FIG. 6, the corresponding step 100: "Sampling a sample signal from the power supply circuit of the device", which may include the following steps:

(1) Obtaining the initial sample signal from the power supply circuit of the device;

(2) Perform differential amplification processing on the initial sample signal to obtain a sample signal.

Further, on the basis of the foregoing embodiment shown in FIG. 6, the corresponding step 101 "accumulates and holds the sample signal to obtain the charging voltage corresponding to the sample signal", which may specifically include the following steps: (a) performing rectification processing on the sample signal after differential amplification processing;

(b) Accumulating and maintaining the rectified sample-like signal to obtain the corresponding charging voltage after the sample-like signal is accumulated.

Further optionally, on the basis of the embodiment shown in FIG. 6 , the corresponding step 102 “contrasts the charging voltage with the preset reference voltage, and when the difference between the charging voltage and the preset reference voltage is less than When the threshold is equal to the preset threshold, the control signal is sent, and the method may include: comparing the charging voltage with a preset reference voltage, and issuing a control signal when a difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold. .

Further, optionally, based on the foregoing embodiment shown in FIG. 6, step 103: "cutting the power supply circuit of the device according to the control signal" may specifically include: when the difference between the charging voltage and the preset reference voltage is greater than or equal to a preset threshold When the control signal is turned off, the switch tube in the power supply circuit of the device is turned off.

The control method of the protection circuit of the above embodiment is the same as that of the protection circuit of the related embodiment. For details, reference may be made to the description of the related embodiments, and details are not described herein again.

The control method of the protection circuit of the above embodiment can be used when the backlash of the back plate pins is caused by contamination (such as foreign matter, etc.), and when the voltage difference is pulled (ie, a fault arc occurs), when the arc current is far from being open or The protection point of the fuse, but the arc is pulsed due to the fault, the spike of the arc current is large, and the capacitor can be quickly charged by the spike of the arc current, and the difference between the charging voltage and the preset reference voltage When the threshold is less than or equal to the preset threshold, the control signal is sent, and the switch tube of the power supply loop of the device is cut off according to the control signal, so that the arc extinguishing can be quickly performed, the arc energy convergence is enhanced, and the fire is prevented from occurring. The protection circuit of the embodiment can enhance the security of use of the telecommunications subrack device.

Those of ordinary skill in the art will appreciate that the elements of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether such functions are performed in hardware or software depends on the particulars of the technical solution to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the present invention.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, The skilled person should understand that the technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the embodiments of the present invention. The spirit and scope of the technical solution.

Claims

claims

1. A protection circuit, characterized by including:

The sampling module is connected to the power supply circuit of the equipment, and is used to sample from the power supply circuit of the equipment and obtain the sampling signal; the power supply circuit of the equipment is the power supply in the telecommunications subrack equipment and the power supply provided in the telecommunications subrack equipment. at least one circuit between slots;

A processing module, connected to the sampling module, is used to accumulate and maintain the sampling signal, and obtain the corresponding charging voltage after the sampling signal is accumulated;

A judgment module, connected to the processing module, used to compare the charging voltage with a preset reference voltage, and when the difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold, Send control signals to the drive module;

The driving module is connected to the judgment module, and is used to receive the control signal sent by the judgment module, and cut off the power supply circuit of the device according to the control signal.

2. The protection circuit according to claim 1, characterized in that the sampling module includes:

A sampling unit, connected to the power supply circuit of the equipment, is used to sample from the power supply circuit of the equipment and obtain the initial sampling signals at both ends of the sampling unit;

A differential amplifier is connected to the sampling unit, and is used to differentially amplify the initial sampling signal at both ends of the sampling unit to obtain the sampling signal.

3. The protection circuit according to claim 2, characterized in that the sampling unit is implemented by a sampling resistor or a current transformer.

4. The protection circuit according to claim 2, characterized in that the processing module includes a diode and a capacitor;

The diode is connected to the differential amplifier and is used to rectify the sampled signal after differential amplification;

One end of the capacitor is connected to the diode, and the other end of the capacitor is grounded; the capacitor accumulates and retains the sampled signal after rectification by the diode for charging, and at one end of the capacitor The corresponding charging voltage after the sample signal is accumulated is obtained.

5. The protection circuit according to claim 4, wherein the processing module further includes a first resistor, and the first resistor is connected in series between the diode and the capacitor.

6. The protection circuit according to claim 4 or 5, characterized in that, the processing The module also includes a second resistor, and the second resistor is connected in parallel to both ends of the capacitor.

7. The protection circuit according to claim 4, characterized in that: the judgment module is implemented by a comparator; the negative electrode of the comparator is connected to one end of the capacitor to obtain the charging voltage of the capacitor; The anode of the comparator is connected to the preset reference voltage. The comparator is used to compare the charging voltage with the preset reference voltage, and when the charging voltage is compared with the preset reference voltage, When the voltage difference is less than or equal to the preset threshold, a control signal is sent to the driving module.

8. The protection circuit according to claim 7, characterized in that the driving module is connected to the output end of the comparator, and is used to operate when the difference between the charging voltage and the preset reference voltage is less than or equal to When the threshold is preset, the control signal output by the comparator is received, and the switch tube in the power supply circuit of the device is turned off according to the control signal.

9. The protection circuit according to claim 8, characterized in that the switching tube in the equipment power supply circuit is a MoS tube, a relay, or a contactor.

10. A telecommunications subrack device, including: at least one power supply and a backplane provided with at least one slot; each of the slots is used to plug in a single board; the at least one power supply is connected to the at least one slot respectively. connection to supply power to the single boards plugged into each slot; It is characterized in that any of the above claims 1-9 is provided in the equipment power supply circuit between the power supply and the at least one slot. the protection circuit described above.

11. A control method for a protection circuit, characterized by including:

Samples are taken from the equipment power supply circuit to obtain the sample signal; the equipment power supply circuit is a circuit between the power supply in the telecommunications subrack equipment and at least one slot provided in the telecommunications subrack equipment;

Accumulate and maintain the sampled signal, and obtain the corresponding charging voltage after the sampled signal is accumulated;

Compare the charging voltage with a preset reference voltage, and when the difference between the charging voltage and the preset reference voltage is less than or equal to a preset threshold, send a control signal;

Cut off the power supply circuit of the device according to the control signal.

12. The method according to claim 11, characterized in that,

The sampling from the power supply circuit of the device and obtaining the sample signal include:

Sample from the power supply circuit of the device to obtain an initial sampling signal;

Perform differential amplification processing on the initial sampling signal to obtain the sampling signal.

13. The method according to claim 12, characterized in that, accumulating and maintaining the sampled signal, and obtaining the charging voltage corresponding to the sampled signal includes:

Perform rectification processing on the sampled signal after differential amplification;

Accumulate and maintain the rectified sample signal to obtain the corresponding charging voltage after the sample signal is accumulated.

14. The method according to claim 13, characterized in that cutting off the power supply circuit of the device according to the control signal includes:

When the difference between the charging voltage and the preset reference voltage is less than or equal to the preset threshold, the switch tube in the power supply circuit of the device is turned off according to the control signal.