Backup power supply detection circuit and detection device suitable for power distribution terminal

Abstract

The invention discloses a backup power supply detection circuit and detection device suitable for a power distribution terminal, and relates to the technical field of power grids, in the disclosed backup power supply detection circuit, a load simulation circuit is connected with a driving circuit, a sampling circuit and a backup power supply of the power distribution terminal, and the sampling circuit is connected with the driving circuit; a load simulation circuit at least comprising a plurality of loads is adopted, and when a driving circuit receives a trigger instruction, a driving loop between each load in the load simulation circuit and a backup power supply is conducted; the sampling circuit obtains electrical parameters of the driving loop in a preset time period and sends the electrical parameters to the driving circuit; and the driving circuit converts the electrical parameters into power parameters, judges whether the power parameters reach a preset power threshold value or not, obtains a power judgment result, and detects the backup power supply according to the power judgment result, so that the instantaneous loading capacity of the backup power supply is detected on the basis of accessing the load, and the detection precision is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of power grids, and particularly to a backup power supply detection circuit and a detection device applicable to distribution terminals. Background Art

[0002] With the improvement of the intelligence and integration levels of distribution terminals in the power grid, the load-carrying capacity of their supporting backup power supplies (such as lithium-ion batteries, supercapacitors, etc.) has become a core indicator to ensure the continuous operation of terminal equipment under abnormal power grid conditions.

[0003] Currently, when the prior art detects the load-carrying capacity of the backup power supply of a distribution terminal, the backup power supply of the distribution terminal is only connected to some instruments for monitoring, such as a voltmeter, an ammeter, etc., and the output voltage of the backup power supply under no-load conditions is measured by the instruments to judge the state of the backup power supply. However, the above method can only obtain the basic information of the backup power supply under no-load conditions and cannot accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, resulting in low detection accuracy. Summary of the Invention

[0004] The main purpose of the present application is to provide a backup power supply detection circuit and a detection device applicable to distribution terminals, aiming to solve the technical problem that the prior art can only obtain the basic information of the backup power supply under no-load conditions and cannot accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, resulting in low detection accuracy.

[0005] To achieve the above purpose, the present application provides a backup power supply detection circuit applicable to a distribution terminal, and the backup power supply detection circuit includes: a driving circuit, a load simulation circuit, and a sampling circuit; The load simulation circuit is respectively connected to the driving circuit, the sampling circuit, and the backup power supply of the distribution terminal, and the sampling circuit is connected to the driving circuit; Wherein, the load simulation circuit at least includes several loads; The driving circuit is used for conducting the driving loop between each load in the load simulation circuit and the backup power supply when receiving a trigger instruction; The sampling circuit is used for acquiring the electrical parameters of the driving loop within a preset time period and sending the electrical parameters to the driving circuit; The driving circuit is further used for converting the electrical parameters into power parameters, judging whether the power parameters reach a preset power threshold, and obtaining a power judgment result; The driving circuit is further used for detecting the backup power supply according to the power judgment result.

[0006] In an embodiment, the driving circuit includes: a single-chip microcomputer, a driving button, and a detection switch module; The single-chip microcomputer is respectively connected to the driving button and the detection switch module, and the detection switch module is connected to the load simulation circuit; The driving button is used for outputting a detection signal to the single-chip microcomputer when receiving the triggering instruction; The single-chip microcomputer is used for outputting a driving signal to the detection switch module when receiving the detection signal; The detection switch module is used for closing when receiving the driving signal, and conducting the driving loop between each load in the load simulation circuit and the backup power supply.

[0007] In one embodiment, the detection switch module includes: a first triode, a first resistor, and a second resistor; The base of the first triode is respectively connected to the first end of the first resistor and the first end of the second resistor. The second end of the first resistor is connected to the single-chip microcomputer. The second end of the second resistor and the emitter of the first triode are grounded. The collector of the first triode is connected to the load simulation circuit.

[0008] In one embodiment, the load simulation circuit includes: a load switch module and a load module; The load switch module is respectively connected to the backup power supply, the load module, the detection switch module, and the sampling circuit, and the load module is connected to the sampling circuit; The detection switch module is further used for closing when receiving the driving signal, grounding the load switch module, so that a low-level control signal is input to the load switch module; The load switch module is used for conducting the driving loop between the load module and the backup power supply when receiving the low-level control signal.

[0009] In one embodiment, the load switch module includes: a first transistor, a second transistor, a third transistor, and a third resistor; The load module includes: a first load, a second load, and a third load; The source electrodes of the first transistor, the second transistor, and the third transistor are all connected to the backup power supply; The gate electrodes of the first transistor, the second transistor, and the third transistor are all connected to the first end of the third resistor, and the second end of the third resistor is connected to the detection switch module; The drain of the first transistor is connected to the first end of the first load, the drain of the second transistor is connected to the first end of the second load, and the drain of the third transistor is connected to the first end of the third load; The second ends of the first load, the second load, and the third load are all connected to the sampling circuit.

[0010] In one embodiment, the load simulation circuit further includes: a load protection module; The load protection module includes: a first transient voltage suppression diode and a fourth resistor; The first end of the first transient voltage suppression diode is connected to the backup power supply, and the second end of the first transient voltage suppression diode is connected to the first end of the third resistor; The first end of the fourth resistor is connected to the backup power supply, and the second end of the fourth resistor is connected to the first end of the third resistor.

[0011] In one embodiment, the sampling circuit includes: a voltage sampling circuit and a current sampling circuit; The voltage sampling circuit is respectively connected to the single-chip microcomputer and the load switch module, and the current sampling circuit is respectively connected to the single-chip microcomputer and the load module; The voltage sampling circuit is configured to obtain the sampled voltage of the drive circuit during the preset time period and send the sampled voltage to the single-chip microcomputer; The current sampling circuit is configured to obtain the sampled current of the drive circuit during the preset time period and send the sampled current to the single-chip microcomputer; The single-chip microcomputer is further configured to determine the power parameter of the drive circuit according to the sampled voltage and the sampled current, and determine whether the power parameter reaches the preset power threshold to obtain a power judgment result.

[0012] In one embodiment, the voltage sampling circuit includes: a second triode, a second transient voltage suppression diode, a first light-emitting diode, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor; The base of the second triode is connected to the first end of the fifth resistor, and the second end of the fifth resistor and the emitter of the second triode are both connected to the load switch module; The collector of the second triode is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor. The second end of the sixth resistor is connected to the anode of the first light-emitting diode, the cathode of the first light-emitting diode is grounded, the second end of the seventh resistor is respectively connected to the first end of the eighth resistor, the first end of the second transient voltage suppression diode and the single-chip microcomputer, and the second ends of the eighth resistor and the second transient voltage suppression diode are both grounded.

[0013] In one embodiment, the current sampling circuit includes: a first bidirectional diode, a third transient voltage suppression diode, an operational amplifier module, a first capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The non-inverting input terminal of the operational amplifier module is connected to the first end of the ninth resistor. The second end of the ninth resistor is respectively connected to the first end of the third transient voltage suppression diode, the first end of the first bidirectional diode, the first end of the tenth resistor, the first end of the eleventh resistor, and the load module. The second ends of the third transient voltage suppression diode, the first bidirectional diode, the tenth resistor, and the eleventh resistor are all grounded; The output terminal of the operational amplifier module is connected to the first end of the twelfth resistor. The second end of the twelfth resistor is respectively connected to the first end of the first capacitor and the single-chip microcomputer, and the second end of the first capacitor is grounded.

[0014] In addition, to achieve the above object, the present application also proposes a detection device, and the detection device includes the backup power detection circuit for the distribution terminal described above.

[0015] One or more technical solutions proposed by the present application have at least the following technical effects: The backup power supply detection circuit applicable to a power distribution terminal disclosed in this application includes: a driving circuit, a load simulation circuit, and a sampling circuit; the load simulation circuit is respectively connected to the driving circuit, the sampling circuit, and the backup power supply of the power distribution terminal, and the sampling circuit is connected to the driving circuit; this application uses a load simulation circuit including at least several loads. When the driving circuit receives a trigger instruction, it conducts the driving loop between each load in the load simulation circuit and the backup power supply; the sampling circuit acquires the electrical parameters of the driving loop within a preset time period and sends the electrical parameters to the driving circuit; the driving circuit converts the electrical parameters into power parameters, determines whether the power parameters reach a preset power threshold to obtain a power judgment result, and detects the backup power supply according to the power judgment result. Since this application realizes the simulation of the load connected to the backup power supply through the load simulation circuit and uses the power corresponding to the electrical parameters of the driving loop within a preset time period to detect the backup power supply, therefore, this application can realize the instantaneous load-carrying capacity detection of the backup power supply on the basis of connecting the load, can accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, and effectively improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the first embodiment of the backup power supply detection circuit of this application; Figure 2 It is a schematic structural diagram of the second embodiment of the backup power supply detection circuit of this application; Figure 3 It is a circuit schematic diagram of the detection switch module in the third embodiment of this application; Figure 4 It is a schematic structural diagram of the third embodiment of the backup power supply detection circuit of this application; Figure 5 It is a circuit schematic diagram of the load simulation circuit in the third embodiment of this application; Figure 6 It is a schematic structural diagram of the fourth embodiment of the backup power supply detection circuit of this application; Figure 7 It is a circuit schematic diagram of the third embodiment of this application.

[0019] The realization of the purpose of this application, its functional characteristics and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific Embodiments

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not used to limit this application.

[0021] To better understand the technical solutions of this application, the following will be described in detail in conjunction with the accompanying drawings of the specification and specific embodiments.

[0022] The main solution of the embodiment of this application is: the backup power supply detection circuit includes a drive circuit, a load simulation circuit, and a sampling circuit; the load simulation circuit is respectively connected to the drive circuit, the sampling circuit, and the backup power supply of the power distribution terminal, and the sampling circuit is connected to the drive circuit; this application uses a load simulation circuit including at least several loads. When the drive circuit receives a trigger instruction, it conducts the drive loop between each load in the load simulation circuit and the backup power supply; the sampling circuit acquires the electrical parameters of the drive loop within a preset period and sends the electrical parameters to the drive circuit; the drive circuit converts the electrical parameters into power parameters, determines whether the power parameters reach a preset power threshold to obtain a power judgment result, and detects the backup power supply according to the power judgment result.

[0023] Since the prior art can only obtain the basic information of the backup power supply under no-load conditions, it cannot accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, and the detection accuracy is low.

[0024] This application realizes the simulation of the load connected to the backup power supply through the load simulation circuit, and uses the power corresponding to the electrical parameters of the drive loop within a preset period to detect the backup power supply. Therefore, this application can realize the detection of the instantaneous load-carrying capacity of the backup power supply on the basis of connecting a load, can accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, and effectively improves the detection accuracy.

[0025] Based on this, this application provides a backup power supply detection circuit, referring to Figure 1 , Figure 1 is a schematic structural diagram of the first embodiment of the backup power supply detection circuit of this application.

[0026] In this embodiment, the backup power supply detection circuit includes: a drive circuit 10, a load simulation circuit 20, and a sampling circuit 30.

[0027] The load simulation circuit 20 is respectively connected to the drive circuit 10, the sampling circuit 30, and the backup power supply 40 of the power distribution terminal, and the sampling circuit 30 is connected to the drive circuit 10.

[0028] Among them, the load simulation circuit 20 includes at least several loads.

[0029] It should be noted that the above-mentioned distribution terminal can be a device for monitoring and controlling switchgear, transformers, lines, etc. in the distribution network. The backup power supply 40 of the distribution terminal can be used to provide stable and sufficient load current within a short period of time when the distribution terminal performs fault location, data backhaul, and remote control. Therefore, in order to ensure that the backup power supply 40 can provide stable and sufficient load current for the distribution terminal within a short period of time, it is necessary to test its instantaneous load-carrying capacity.

[0030] It can be understood that the above-mentioned drive circuit 10 can be a circuit for driving the load simulation circuit 20.

[0031] It should be noted that the above-mentioned load simulation circuit 20 can be a circuit with multiple loads, simulating the actual load characteristics connected to the distribution terminal. This load simulation circuit 20 can be used to evaluate the performance of the backup power supply during the test.

[0032] It can be understood that the above-mentioned sampling circuit 30 can be a circuit for collecting voltage or current parameters in the load simulation circuit 20 when the load simulation circuit 20 is connected to the backup power supply 40.

[0033] The drive circuit 10 is used to conduct the drive loop between each load in the load simulation circuit 20 and the backup power supply 40 when a trigger instruction is received.

[0034] In a specific implementation, the above-mentioned drive circuit 10 can provide a corresponding button or switch, and corresponding operations can be performed on the button or switch. For example, a pressing operation triggers the above-mentioned trigger instruction. The drive circuit 10 can be used as a switching device between each load of the load simulation circuit 20 and the backup power supply 40. After the drive circuit 10 receives the trigger instruction, it can connect each load in the load simulation circuit 20 to the backup power supply 40, conduct the drive loop formed between each load in the load simulation circuit 20 and the backup power supply 40, and the backup power supply 40 can supply power to each load through this drive loop to realize the drive of each load.

[0035] The sampling circuit 30 is used to obtain the electrical parameters of the drive loop within a preset period and send the electrical parameters to the drive circuit 10.

[0036] It should be noted that the above-mentioned preset period can be a preset time range, such as 100 ms. By setting a shorter preset period, the instantaneous load-carrying capacity test of the backup power supply 40 can be realized.

[0037] It can be understood that the above-mentioned electrical parameters can be parameters describing the circuit characteristics in the drive loop or physical quantities related to electric energy and electric fields, such as voltage and current.

[0038] In a specific implementation, the above-mentioned sampling circuit 30 can be connected to the load simulation circuit 20. When the driving circuits between the respective loads in the load simulation circuit 20 and the backup power supply 40 are turned on, the electrical parameters in the driving circuit can be collected in real time, and the collected electrical parameters can be output to the driving circuit 10.

[0039] The driving circuit 10 is further configured to convert the electrical parameters into power parameters, and determine whether the power parameters reach a preset power threshold to obtain a power determination result.

[0040] It should be noted that the above-mentioned preset power threshold can be a preset power threshold, such as 1000W, which is used to participate in the instantaneous load-carrying detection of the backup power supply 40.

[0041] In a specific implementation, the above-mentioned driving circuit 10 can perform data processing on the electrical parameters output by the sampling circuit 30 to obtain power parameters. For example, if the electrical parameters output by the sampling circuit 30 are voltage and current, the power parameters can be obtained by multiplication. The driving circuit can compare the obtained power parameters with the preset power threshold to determine whether the power parameters reach the preset power threshold. The obtained power determination result is that the power parameters reach the preset power threshold, or the power parameters do not reach the preset power threshold.

[0042] The driving circuit 10 is further configured to detect the backup power supply 40 according to the power determination result.

[0043] In a specific implementation, when the power parameters reach the preset power threshold, the driving circuit 10 determines that the backup power supply 40 is normal and can have sufficient power to drive the load within a preset period, and further determines that the instantaneous load-carrying capacity of the backup power supply 40 meets the requirements. On the contrary, when the power parameters do not reach the preset power threshold, the driving circuit 10 determines that the backup power supply 40 is abnormal and cannot have sufficient power to drive the load within a preset period, and further determines that the instantaneous load-carrying capacity of the backup power supply 40 fails to meet the requirements.

[0044] In addition, a display module can be provided in the driving circuit 10 to display the detection result of the above-mentioned instantaneous load-carrying capacity of the backup power supply 40, so as to facilitate the user to know the detection result and improve the user experience.

[0045] The backup power supply detection circuit applicable to the distribution terminal in this embodiment includes: a drive circuit, a load simulation circuit, and a sampling circuit; the load simulation circuit is respectively connected to the drive circuit, the sampling circuit, and the backup power supply of the distribution terminal, and the sampling circuit is connected to the drive circuit; this embodiment uses a load simulation circuit including at least several loads. When the drive circuit receives a trigger instruction, it conducts the drive loop between each load in the load simulation circuit and the backup power supply; the sampling circuit obtains the electrical parameters of the drive loop within a preset time period and sends the electrical parameters to the drive circuit; the drive circuit converts the electrical parameters into power parameters, determines whether the power parameters reach a preset power threshold, obtains a power judgment result, and detects the backup power supply according to the power judgment result. Since this embodiment realizes the simulation of the load connected to the backup power supply through the load simulation circuit, and uses the power corresponding to the electrical parameters of the drive loop within a preset time period to detect the backup power supply, therefore, this embodiment can realize the instantaneous load-carrying capacity detection of the backup power supply on the basis of connecting the load, can accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, and effectively improves the detection accuracy.

[0046] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, the same or similar content as the above first embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 2 , Figure 2 which is the structural schematic diagram of the second embodiment of the backup power supply detection circuit of the present application.

[0047] In this embodiment, the drive circuit includes: a single-chip microcomputer 101, a drive button S1, and a detection switch module 102.

[0048] The single-chip microcomputer 101 is respectively connected to the drive button S1 and the detection switch module 102, and the detection switch module 102 is connected to the load simulation circuit 20.

[0049] It should be noted that the above detection switch module 102 can be a circuit for controlling whether each load in the load simulation circuit 20 is connected to the backup power supply 40.

[0050] The drive button S1 is used to output a detection signal to the single-chip microcomputer 101 when receiving the trigger instruction.

[0051] In specific implementation, the above can trigger the above trigger instruction by performing a pressing operation on the drive button S1. When the drive button S1 receives the trigger instruction, it can generate a detection signal for starting the instantaneous load-carrying capacity detection and output the detection signal to the single-chip microcomputer 101.

[0052] The single-chip microcomputer 101 is configured to output a driving signal to the detection switch module 102 when receiving the detection signal.

[0053] It should be noted that the above driving signal can be a signal for driving the detection switch module 102 to connect each load in the load simulation circuit 20 to the backup power supply 40.

[0054] In a specific implementation, the single-chip microcomputer 101 can generate the above driving signal when receiving the detection signal output by the driving button S1, and output the driving signal to the detection switch module 102.

[0055] The detection switch module 102 is configured to close when receiving the driving signal, and conduct the driving loop between each load in the load simulation circuit 20 and the backup power supply 40.

[0056] In a specific implementation, a switching device can be provided in the detection switch module 102. The switching device closes when receiving the driving signal, connects each load in the load simulation circuit 20 to the backup power supply 40, thereby conducting the driving loop between each load in the load simulation circuit 20 and the backup power supply 40.

[0057] For ease of understanding, reference Figure 3 is made for illustration, but the present solution is not limited thereto. Figure 3 is the circuit schematic diagram of the detection switch module in the third embodiment of the present application. Figure 3 In, the detection switch module 102 includes: a first triode Q11, a first resistor R1, and a second resistor R2.

[0058] The base of the first triode Q11 is respectively connected to the first end of the first resistor R1 and the first end of the second resistor R2. The second end of the first resistor R1 is connected to the single-chip microcomputer 101. The second end of the second resistor R2 and the emitter of the first triode Q11 are grounded. The collector of the first triode Q11 is connected to the load simulation circuit 20.

[0059] Among them, Figure 3 The shown first triode Q11 is an NPN-type triode, but it is not limited thereto. In practical applications, a PNP-type triode can also be used. In this embodiment and the following embodiments, the first triode Q'11 is described with an NPN-type triode.

[0060] It should be noted that after the single-chip microcomputer 101 receives the detection signal, it can continuously output a driving signal with a high level to the first resistor R1 within a preset time period. The first resistor R1 can be used as a current-limiting resistor for the base of the first triode Q11 to control the magnitude of the current in the base of the first triode Q11. At the same time, after the second resistor R2 receives the driving signal, it can provide a stable bias voltage for the base of the first triode Q11, so that the first triode Q11 is turned on, grounding the load simulation circuit 20, and thus conducting the driving loop between each load in the load simulation circuit 20 and the backup power supply 40.

[0061] It should be understood that by controlling the first triode Q11 through the driving signal output by the single-chip microcomputer 101, it is possible to realize the quick on / off of the driving loop between the load in the load simulation circuit 20 and the backup power supply 40, thereby improving the efficiency of the load-carrying capacity detection of the backup power supply 40.

[0062] In this embodiment, when the driving button receives a trigger instruction, it outputs a detection signal to the single-chip microcomputer; when the single-chip microcomputer receives the detection signal, it outputs a driving signal to the detection switch module; when the detection switch module receives the driving signal, it closes, conducting the driving loop between each load in the load simulation circuit and the backup power supply. In this embodiment, by the driving button responding to the trigger instruction, the single-chip microcomputer outputs a driving signal to control the detection switch module to close, thereby realizing the accurate control of the driving loop, and further improving the accuracy of the load-carrying capacity detection of the backup power supply.

[0063] Based on the first embodiment and the second embodiment of the present application, the third embodiment of the present application is proposed. In the third embodiment of the present application, the content that is the same as or similar to the above first embodiment and second embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the third embodiment of the backup power supply detection circuit of the present application.

[0064] In this embodiment, the load simulation circuit 20 includes: a load switch module 201 and a load module 202.

[0065] It should be noted that the above load switch module 201 can be a switching device for controlling whether the load module 20 is connected to the backup power supply 40.

[0066] It can be understood that the above load module 202 can be composed of multiple loads (such as resistors) and is used to simulate the circuit of the actual load characteristics connected to the distribution terminal.

[0067] The load switch module 201 is respectively connected to the backup power supply 40, the load module 202, the detection switch module 102, and the sampling circuit 30, and the load module 202 is connected to the sampling circuit 30.

[0068] The detection switch module 102 is further configured to close when receiving the driving signal, ground the load switch module 201, so that a low-level driving signal is input to the load switch module 201.

[0069] In a specific implementation, the first triode Q11 in the above detection switch module 102 closes when receiving the driving signal, grounds the load switch module 201, and then inputs a low-level control signal to the load switch module.

[0070] The load switch module 201 is configured to conduct the driving loop between the load module 202 and the backup power supply 40 when receiving the low-level control signal.

[0071] In a specific implementation, the above load switch module 201 can close when receiving a low-level control signal, connect the load module 202 to the backup power supply 40, and conduct the driving loop between the load module 202 and the backup power supply 40.

[0072] For ease of understanding, reference is made to Figure 5 for illustration, but the present solution is not limited thereto. Figure 5 This is the circuit schematic diagram of the load simulation circuit in the third embodiment of the present application. Figure 5 In, the load switch module 201 includes: a first transistor Q21, a second transistor Q22, a third transistor Q23, and a third resistor R3. The load module 202 includes: a first load R01, a second load R02, and a third load R03.

[0073] The source electrodes of the first transistor Q21, the second transistor Q22, and the third transistor Q23 are all connected to the backup power supply 40.

[0074] The gate electrodes of the first transistor Q21, the second transistor Q22, and the third transistor Q23 are all connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the detection switch module 102. The drain electrode of the first transistor Q21 is connected to the first end of the first load R01, the drain electrode of the second transistor Q22 is connected to the first end of the second load R02, and the drain electrode of the third transistor Q23 is connected to the first end of the third load R03. The second ends of the first load R01, the second load R02, and the third load R03 are all connected to the sampling circuit 30.

[0075] It should be noted that the first transistor Q21, the second transistor Q22, and the third transistor Q23 can all be P-type metal oxide semiconductor field effect transistors.

[0076] It is understandable that the first load R01, the second load R02, and the third load R03 can all be aluminum shell resistors.

[0077] It should be noted that when the first triode Q11 in the above detection switch module 102 receives a driving signal, it closes, grounding the load switch module 201, and then inputting a low-level control signal to the gates of the first transistor Q21, the second transistor Q22, and the third transistor Q23, so that the first transistor Q21, the second transistor Q22, and the third transistor Q23 close, respectively connecting the first load R01, the second load R02, and the third load R03 to the backup power supply 40, and conducting the driving loop between the backup power supply 40, the first load R01, the second load R02, and the third load R03.

[0078] Among them, the parallel connection of the first transistor Q21, the second transistor Q22, and the third transistor Q23 can improve the current-carrying capacity and reduce the conduction loss.

[0079] It should be understood that the third resistor R3 and the fourth resistor R4 are used for voltage division of the backup power supply; the third resistor R3 is used to set the base bias voltage of the first triode Q11 or limit the base current of the first triode Q11.

[0080] In this embodiment, the load simulation circuit 20 further includes: a load protection module 203.

[0081] The load protection module 203 includes: a first transient voltage suppression diode TVS1 and a fourth resistor R4.

[0082] The first end of the first transient voltage suppression diode TVS1 is connected to the backup power supply 40, and the second end of the first transient voltage suppression diode TVS1 is connected to the first end of the third resistor R3. The first end of the fourth resistor R4 is connected to the backup power supply 40, and the second end of the fourth resistor R4 is connected to the first end of the third resistor R3.

[0083] In specific implementation, the first transient voltage suppression diode TVS1 is used to protect the gates of the first transistor Q21, the second transistor Q22, and the third transistor Q23 or the input end of the backup power supply 40 from surge voltage or electrostatic discharge (ESD) impact, improving the safety performance of the circuit.

[0084] In this embodiment, the detection switch module closes when receiving a driving signal, grounding the load switch module to input a low-level control signal to the load switch module; when the load switch module receives the low-level control signal, it conducts the driving loop between the load module and the backup power supply. In this embodiment, the load module is controlled to access the backup power supply through the load switch module, effectively improving the accuracy of the load module accessing the backup power supply, and further improving the accuracy of the backup power supply load capacity detection.

[0085] Based on the first embodiment, the second embodiment, and the third embodiment of the present application, the fourth embodiment of the present application is proposed. In the fourth embodiment of the present application, for the content that is the same as or similar to the above first embodiment, second embodiment, and third embodiment, reference may be made to the above introduction and will not be elaborated hereinafter. On this basis, please refer to Figure 6 , Figure 6 which is a schematic structural diagram of the fourth embodiment of the backup power supply detection circuit of the present application.

[0086] In this embodiment, the sampling circuit 30 includes: a voltage sampling circuit 301 and a current sampling circuit 302.

[0087] The voltage sampling circuit 301 is respectively connected to the single-chip microcomputer 101 and the load switch module 201, and the current sampling circuit 302 is respectively connected to the single-chip microcomputer 101 and the load module 202.

[0088] It should be noted that the above voltage sampling circuit 301 can be a circuit for sampling the voltage of the driving loop.

[0089] It can be understood that the above current sampling circuit 302 can be a circuit for sampling the current of the driving loop.

[0090] The voltage sampling circuit 301 is used to obtain the sampled voltage of the driving loop within a preset time period and send the sampled voltage to the single-chip microcomputer 101.

[0091] For the sake of easy understanding, reference is made to Figure 7 for illustration, but it does not limit the present solution. Figure 7 which is the circuit schematic diagram of the third embodiment of the present application, Figure 7 in which the voltage sampling circuit 301 includes: a second triode Q12, a second transient voltage suppression diode TVS2, a first light-emitting diode D1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.

[0092] The base of the second triode Q12 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 and the emitter of the second triode Q12 are both connected to the load switch module 201 (i.e., the sources of the first transistor Q21, the second transistor Q22, and the third transistor Q23). The collector of the second triode Q12 is respectively connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7. The second end of the sixth resistor R6 is connected to the anode of the first light-emitting diode D1, the cathode of the first light-emitting diode D1 is grounded, the second end of the seventh resistor R7 is respectively connected to the first end of the eighth resistor R8, the first end of the second transient voltage suppression diode TVS2, and the single-chip microcomputer 101, and the second ends of the eighth resistor R8 and the second transient voltage suppression diode TVS2 are both grounded.

[0093] In a specific implementation, a PNP-type triode is used to illustrate the second triode Q12. After the above-mentioned first triode Q11 is turned on, a low-level control signal is input to the base of the second triode Q12, causing the second triode Q12 to close, connecting the seventh resistor R7 and the eighth resistor R8 to the backup power supply 40, and the seventh resistor R7 and the eighth resistor R8 are in series for current limiting or signal conditioning. The voltage between the seventh resistor R7 and the eighth resistor R8 can be used as a sampling voltage, that is, the sampling voltage at the second end of the seventh resistor R7 or the first end of the eighth resistor R8 can be output to the single-chip microcomputer 101 to achieve voltage sampling.

[0094] It should be understood that the fifth resistor R5 and the fourth resistor R4 are used as current-limiting resistors for the base of the second triode Q12, and the base current of the second triode Q12 can be controlled through the fifth resistor R5 and the fourth resistor R4.

[0095] It should be noted that the energy storage terminal CN+ of the above-mentioned backup power supply 40 can be used as the positive electrode of the backup power supply 40. The emitter of the second triode Q12 is connected to the energy storage terminal CN+ of the backup power supply 40, and the collector of the second triode Q12 is connected to the sixth resistor R6 and the seventh resistor R7, which can perform the functions of high-power switching or distributed control in the circuit. The sixth resistor R6 is connected to the first light-emitting diode D1 and can be used as a current-limiting, pull-up or pull-down resistor, and can also form a driving circuit for the first light-emitting diode D1. The second transient voltage suppression diode TVS2 is used to protect the input end of the backup power supply 40 from surge voltage or ESD impact; the first light-emitting diode D1 can be used for status indication.

[0096] The current sampling circuit 302 is used to obtain the sampling current of the driving loop within a preset period and send the sampling current to the single-chip microcomputer 101.

[0097] Refer to Figure 7, the current sampling circuit 302 includes: a first bidirectional diode D01, a third transient voltage suppression diode TVS3, an operational amplifier module 303, a first capacitor C1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12.

[0098] The non-inverting input terminal of the operational amplifier module 303 is connected to the first end of the ninth resistor R9. The second end of the ninth resistor R9 is respectively connected to the first end of the third transient voltage suppression diode TVS3, the first end of the first bidirectional diode D01, the first end of the tenth resistor R10, the first end of the eleventh resistor R11, and the second ends of the load module 202 (i.e., the second ends of the first load R01, the second load R02, and the third load R03). The second ends of the third transient voltage suppression diode TVS3, the first bidirectional diode D01, the tenth resistor R10, and the eleventh resistor R11 are all grounded. The output terminal of the operational amplifier module 303 is connected to the first end of the twelfth resistor R12. The second end of the twelfth resistor R12 is respectively connected to the first end of the first capacitor C1 and the microcontroller 101. The second end of the first capacitor C1 is grounded.

[0099] Among them, the operational amplifier module 303 includes: an operational amplifier U1, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second capacitor C2, and a third capacitor C3.

[0100] The non-inverting input terminal of the operational amplifier U1 is respectively connected to the first end of the thirteenth resistor R13, the first end of the second capacitor C2, and the first end of the ninth resistor R9. The second ends of the thirteenth resistor R13 and the second capacitor C2 are both grounded. The inverting input terminal of the operational amplifier U1 is respectively connected to the first end of the fifteenth resistor R15, the first end of the third capacitor C3, and the first end of the fourteenth resistor R14. The second ends of the fifteenth resistor R15 and the third capacitor C3 are both connected to the output terminal of the operational amplifier U1. The second end of the fourteenth resistor R14 is grounded. The output terminal of the operational amplifier U1 is connected to the first end of the twelfth resistor R12.

[0101] In a specific implementation, the remote control common terminal YKCOM of the backup power supply 40 can serve as the negative electrode of the backup power supply 40. The eleventh resistor R11 and the tenth resistor R10 are connected in parallel between the energy storage terminal CN+ and the remote control common terminal YKCOM of the backup power supply 40, and are used to achieve high-precision current sampling of the drive circuit, that is, to collect the current of the drive circuit in real time, obtain an initial sampling signal and output it to the operational amplifier module 303. The operational amplifier U1 is connected to the ninth resistor R9 and the twelfth resistor R12, and is used to amplify the initial sampling signal to obtain a sampling signal that can be processed by the single-chip microcomputer 101. The current corresponding to the obtained sampling signal is the above-mentioned sampling current.

[0102] In addition, the first capacitor C1 and the second capacitor C2 can be used to eliminate high-frequency noise on the backup power supply 40 or the signal line and improve stability. The ninth resistor R9 and the twelfth resistor R12 are used for voltage division; the first capacitor C1 is connected to the twelfth resistor R12 and is connected across the backup power supply pin of the operational amplifier U1 and the ground, which can improve stability. The first bidirectional diode D01 and the third transient voltage suppression diode TVS3 are connected to the ninth resistor R9 and are used to protect the input end of the backup power supply 40 from surge voltage or ESD impact.

[0103] The single-chip microcomputer 101 is further configured to determine the power parameter of the drive circuit according to the sampling voltage and the sampling current, and judge whether the power parameter reaches the preset power threshold to obtain a power judgment result.

[0104] In a specific implementation, after the single-chip microcomputer 101 receives the sampling voltage output by the voltage sampling circuit 301 and the sampling current output by the current sampling circuit 302, it can perform data processing on the sampling voltage and the sampling current, such as multiplying the two to obtain the power parameter of the drive circuit, and then by judging whether the power parameter reaches the preset power threshold, a power judgment result is obtained, and the instantaneous load-carrying capacity detection of the backup power supply 40 is realized by using the power judgment result.

[0105] In this embodiment, the voltage sampling circuit obtains the sampling voltage of the drive circuit within a preset time period and sends the sampling voltage to the single-chip microcomputer; the current sampling circuit obtains the sampling current of the drive circuit within a preset time period and sends the sampling current to the single-chip microcomputer; the single-chip microcomputer determines the power parameter of the drive circuit according to the sampling voltage and the sampling current, and judges whether the power parameter reaches the preset power threshold to obtain a power judgment result. In this embodiment, the sampling voltage and the sampling current of the drive circuit are respectively collected by the voltage sampling circuit and the current sampling circuit, effectively improving the acquisition accuracy of the electrical parameters, and further improving the detection accuracy of the backup power supply.

[0106] In addition, the present application also provides a detection device, and the detection device includes the backup power supply detection circuit applicable to the distribution terminal described in the above embodiment.

[0107] The detection device provided by this application includes the backup power supply detection circuit applicable to the distribution terminal in the above embodiments, which can solve the technical problem that the prior art can only obtain the basic information of the backup power supply under no-load conditions and cannot accurately reflect the load-carrying capacity of the backup power supply under actual working conditions, resulting in low detection accuracy. Compared with the prior art, the beneficial effects of the detection device provided by this application are the same as those of the backup power supply detection circuit applicable to the distribution terminal provided in the above embodiments, and the technical features in the detection device are the same as those disclosed in the above backup power supply detection circuit applicable to the distribution terminal, and will not be elaborated here.

[0108] The above are only some embodiments of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural transformation made under the technical concept of this application by using the content of the specification and drawings of this application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A backup power supply detection circuit applicable to a distribution terminal, characterized in that The backup power supply detection circuit includes: a driving circuit, a load simulation circuit, and a sampling circuit; The load simulation circuit is respectively connected to the driving circuit, the sampling circuit, and the backup power supply of the power distribution terminal, and the sampling circuit is connected to the driving circuit; Wherein, the load simulation circuit at least includes several loads; The driving circuit is configured to conduct the driving loop between each of the loads in the load simulation circuit and the backup power supply when receiving a trigger instruction; The sampling circuit is configured to acquire the electrical parameters of the driving loop within a preset time period and send the electrical parameters to the driving circuit; The driving circuit is further configured to convert the electrical parameters into power parameters and determine whether the power parameters reach a preset power threshold to obtain a power judgment result; The driving circuit is further configured to detect the backup power supply according to the power judgment result.

2. The backup power detection circuit applicable to a distribution terminal according to claim 1, wherein The driving circuit includes: a single-chip microcomputer, a driving button, and a detection switch module; The single-chip microcomputer is respectively connected to the driving button and the detection switch module, and the detection switch module is connected to the load simulation circuit; The driving button is configured to output a detection signal to the single-chip microcomputer when receiving the trigger instruction; The single-chip microcomputer is configured to output a driving signal to the detection switch module when receiving the detection signal; The detection switch module is configured to close when receiving the driving signal and conduct the driving loop between each of the loads in the load simulation circuit and the backup power supply.

3. The backup power detection circuit for a distribution terminal according to claim 2, characterized in that, The detection switch module includes: a first triode, a first resistor, and a second resistor; The base of the first triode is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the single-chip microcomputer, the second end of the second resistor and the emitter of the first triode are grounded, and the collector of the first triode is connected to the load simulation circuit.

4. The backup power detection circuit for a distribution terminal according to claim 2, characterized in that, The load simulation circuit includes: a load switch module and a load module; The load switch module is respectively connected to the backup power supply, the load module, the detection switch module, and the sampling circuit, and the load module is connected to the sampling circuit; The detection switch module is further configured to close when receiving the driving signal and ground the load switch module to input a low-level control signal to the load switch module; The load switch module is configured to conduct the driving loop between the load module and the backup power supply when receiving the low-level control signal.

5. The backup power detection circuit for a distribution terminal according to claim 4, wherein, The load switch module includes: a first transistor, a second transistor, a third transistor, and a third resistor; The load module includes: a first load, a second load, and a third load; The source electrodes of the first transistor, the second transistor, and the third transistor are all connected to the backup power supply; The gate electrodes of the first transistor, the second transistor, and the third transistor are all connected to the first end of the third resistor, and the second end of the third resistor is connected to the detection switch module; The drain of the first transistor is connected to the first end of the first load, the drain of the second transistor is connected to the first end of the second load, and the drain of the third transistor is connected to the first end of the third load; The second ends of the first load, the second load, and the third load are all connected to the sampling circuit.

6. The backup power detection circuit applicable to a distribution terminal according to claim 5, wherein The load simulation circuit further includes: a load protection module; The load protection module includes: a first transient voltage suppression diode and a fourth resistor; The first end of the first transient voltage suppression diode is connected to the backup power supply, and the second end of the first transient voltage suppression diode is connected to the first end of the third resistor; The first end of the fourth resistor is connected to the backup power supply, and the second end of the fourth resistor is connected to the first end of the third resistor.

7. The backup power detection circuit for a distribution terminal according to claim 4, characterized in that The sampling circuit includes: a voltage sampling circuit and a current sampling circuit; The voltage sampling circuit is respectively connected to the single-chip microcomputer and the load switch module, and the current sampling circuit is respectively connected to the single-chip microcomputer and the load module; The voltage sampling circuit is configured to obtain the sampled voltage of the drive loop within the preset time period and send the sampled voltage to the single-chip microcomputer; The current sampling circuit is configured to obtain the sampled current of the drive loop within the preset time period and send the sampled current to the single-chip microcomputer; The single-chip microcomputer is further configured to determine the power parameter of the drive loop according to the sampled voltage and the sampled current, and judge whether the power parameter reaches the preset power threshold to obtain a power judgment result.

8. The backup power supply detection circuit for a distribution terminal according to claim 7, wherein, The voltage sampling circuit includes: a second triode, a second transient voltage suppression diode, a first light-emitting diode, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor; The base of the second triode is connected to the first end of the fifth resistor, and the second end of the fifth resistor and the emitter of the second triode are both connected to the load switch module; The collector of the second triode is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor. The second end of the sixth resistor is connected to the anode of the first light-emitting diode, the cathode of the first light-emitting diode is grounded, the second end of the seventh resistor is respectively connected to the first end of the eighth resistor, the first end of the second transient voltage suppression diode, and the single-chip microcomputer, and the second ends of the eighth resistor and the second transient voltage suppression diode are both grounded.

9. The backup power detection circuit applicable to a distribution terminal according to claim 7, characterized in that, The current sampling circuit includes: a first bidirectional diode, a third transient voltage suppression diode, an operational amplifier module, a first capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The non-inverting input terminal of the operational amplifier module is connected to the first end of the ninth resistor. The second end of the ninth resistor is respectively connected to the first end of the third transient voltage suppression diode, the first end of the first bidirectional diode, the first end of the tenth resistor, the first end of the eleventh resistor, and the load module. The second ends of the third transient voltage suppression diode, the first bidirectional diode, the tenth resistor, and the eleventh resistor are all grounded; The output terminal of the operational amplifier module is connected to the first end of the twelfth resistor. The second end of the twelfth resistor is respectively connected to the first end of the first capacitor and the single-chip microcomputer. The second end of the first capacitor is grounded.

10. A detection device, characterized in that, The detection device includes the backup power supply detection circuit according to any one of claims 1 to 9.

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