Power supply line control device and UPS system

Abstract

The present invention provides a power supply line control device and a UPS system. The device includes: a software failure detection circuit, an inverter low-voltage detection circuit, a main control power failure detection circuit, and an integrated output circuit. The software failure detection circuit is used to detect an abnormal state of a DSP module in a target UPS and output a first abnormality signal to the integrated output circuit when an abnormality in the DSP module is detected. The inverter low-voltage detection circuit is used to detect the output voltage of an inverter circuit in a target UPS and output a second abnormality signal to the integrated output circuit when the output voltage is detected to be lower than a preset low-voltage value. The main control power failure detection circuit is used to detect an abnormal state of a main control power supply corresponding to the DSP module in the target UPS and output a third abnormality signal to the integrated output circuit when an abnormality in the main control power supply is detected. The integrated output circuit is used to output a control signal to the target UPS after receiving the abnormality signal. The present invention can improve the reliability of power supply to a load.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit control, and more particularly, relates to a power supply line control device and a UPS system. Background Art

[0002] In the prior art, when a UPS (Uninterruptible Power System / Uninterruptible Power Supply) fails, it is easy to lose the ability to power important loads due to untimely power line switching. At this time, how to achieve uninterrupted power supply to the load as much as possible and improve the reliability of power supply has become a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0003] The object of the present invention is to provide a power supply line control device and a UPS system to achieve uninterrupted power supply to loads as much as possible and improve the reliability of power supply.

[0004] To achieve the above object, the present invention provides a power supply line control device, the power supply line control device comprising:

[0005] Software failure detection circuit, inverter low voltage detection circuit, main control power failure detection circuit, and integrated output circuit;

[0006] The software failure detection circuit is used to detect an abnormal state of a DSP (Digital Signal Processing) module in a target UPS, and outputs a first abnormality signal to the integrated output circuit when an abnormality is detected in the DSP module; the inverter low-voltage detection circuit is used to detect the output voltage of an inverter circuit in a target UPS, and outputs a second abnormality signal to the integrated output circuit when the output voltage is detected to be lower than a preset low-voltage value; the main control power failure detection circuit is used to detect an abnormal state of a main control power supply corresponding to the DSP module in a target UPS, and outputs a third abnormality signal to the integrated output circuit when an abnormality is detected in the main control power supply;

[0007] The integrated output circuit is used to output a control signal to the target UPS after receiving the abnormal signal;

[0008] The abnormal signal is a first abnormal signal, a second abnormal signal, or a third abnormal signal.

[0009] In a possible implementation, the integrated output circuit is specifically configured to:

[0010] After receiving the abnormal signal, the abnormal state of the bypass line in the target UPS is detected, and a control signal is output to the target UPS according to the abnormal state of the bypass line.

[0011] In a possible implementation, the control signal includes a forced switching signal and a shutdown protection signal; and the integrated output circuit is specifically configured to:

[0012] outputting a shutdown protection signal to the target UPS when detecting that the bypass line is abnormal, and outputting a forced switching signal to the target UPS when detecting that the bypass line is normal;

[0013] The forced switching signal is used to instruct the target UPS to perform a switching action from the inverter line to the bypass line, and the shutdown protection signal is used to instruct the target UPS to perform a shutdown action.

[0014] In a possible implementation, the preset low voltage value is determined according to load characteristics of a target UPS common load.

[0015] In a possible implementation, the power supply line control device further includes: a processor;

[0016] The main circuits of the software failure detection circuit, the inverter low voltage detection circuit, and the main control power failure detection circuit are all connected in series with electronic switches, and the processor is connected to each electronic switch;

[0017] The processor is configured to control the electronic switch of the software failure detection circuit to be turned on according to a first preset period, control the controller of the inverter low voltage detection circuit to be turned on according to a second preset period, and control the main control power failure detection circuit to be turned on according to a third preset period;

[0018] The first preset period is determined according to the abnormal frequency of the DSP module, the second preset period is determined according to the low voltage frequency of the output voltage, and the third preset period is determined according to the abnormal frequency of the main control power supply.

[0019] In a possible implementation, the processor is further configured to:

[0020] The abnormal state of the software failure detection circuit is detected in real time, and the inverter low voltage detection circuit is immediately turned on when it is determined that the software failure detection circuit is abnormal.

[0021] In a possible implementation, the processor is further configured to:

[0022] The abnormal state of the main control power failure detection circuit is detected in real time, and the first preset period is reduced when it is determined that the main control power failure detection circuit is abnormal.

[0023] In a possible implementation, the inverter low voltage detection circuit includes a comparator, and the comparator is used to compare the output voltage and the preset low voltage value; the power supply line control device also includes a processor;

[0024] The processor is used to obtain the load characteristics of the current load of the target UPS in real time, and control the preset low voltage value input to the comparator according to the load characteristics.

[0025] In one possible implementation, the main control power failure detection circuit is specifically configured to:

[0026] Detecting an abnormal state of the main power supply by detecting the power supply state of the main power supply corresponding to the DSP module in the target UPS;

[0027] Alternatively, the abnormal state of the main control power supply is detected by detecting the effective state of the backup power supply corresponding to the DSP module in the UPS;

[0028] The backup power supply is used to supply power to the DSP module when the main power supply fails.

[0029] To achieve the above object, the present invention further provides a UPS system, which includes: a target UPS and the power supply line control device described above.

[0030] The beneficial effects of the power supply line control device and UPS system provided by the present invention are:

[0031] The present invention provides a software failure detection circuit to detect abnormal conditions in the DSP module, an inverter low-voltage detection module to detect low-voltage conditions in the inverter circuit, and a main power supply failure detection circuit to detect abnormal conditions in the main power supply. Thus, when a DSP abnormality, inverter circuit low-voltage, or main power supply abnormality occurs, the integrated output circuit can be quickly triggered to output a control signal, thereby ensuring uninterrupted power supply to the load as much as possible and improving the reliability of power supply to the load. Furthermore, the various detection circuits provided in the present invention also have synergistic effects. For example, when the software failure detection circuit fails, even if the DSP module is abnormal, the integrated output circuit will not output a first abnormality signal. However, according to the solution of the present application, even if the software failure detection circuit is unable to output the first abnormality signal, the inverter low-voltage detection circuit will output a second abnormality signal due to the low-voltage inverter circuit caused by the DSP module abnormality. Therefore, when the DSP module is abnormal, the integrated output circuit can be guaranteed to output the corresponding control signal, thereby ensuring uninterrupted power supply to the load and further improving the reliability of power supply to the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic structural diagram of a power supply line control device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a power supply line control device provided in one embodiment of the present invention, the power supply line control device comprising:

[0037] A software failure detection circuit 11 , an inverter low voltage detection circuit 12 , a main control power failure detection circuit 13 , and an integrated output circuit 14 .

[0038] The software failure detection circuit 11 is used to detect abnormal conditions of the DSP module in the target UPS and, upon detecting a DSP module abnormality, outputs a first abnormality signal to the integrated output circuit 14. The inverter low-voltage detection circuit 12 is used to detect the output voltage of the inverter circuit in the target UPS and, upon detecting that the output voltage is below a preset low-voltage value, outputs a second abnormality signal to the integrated output circuit 14. The main power failure detection circuit 13 is used to detect abnormal conditions of the main power supply corresponding to the DSP module in the target UPS and, upon detecting a main power supply abnormality, outputs a third abnormality signal to the integrated output circuit 14.

[0039] The integrated output circuit 14 is used to output a control signal to the target UPS after receiving the abnormal signal.

[0040] The abnormal signal is a first abnormal signal, a second abnormal signal, or a third abnormal signal.

[0041] A DSP module is typically included in a known UPS. The DSP module is used to output control signals to controllable switches in the UPS circuit to control various electrical parameters of the UPS circuit. To prevent load power outages caused by DSP module failure, embodiments of the present invention include a software failure detection circuit 11. This circuit is used to detect abnormal conditions in the DSP module and, upon detection of a DSP module abnormality, output a first abnormality signal to an integrated output circuit 14. The DSP module outputs a low-level signal upon failure. Furthermore, when the software failure detection circuit detects an abnormal condition in the DSP module, it can detect whether the DSP module outputs a low-level signal.

[0042] It is known that when a UPS encounters various abnormalities that may cause power outages, the output voltage of the inverter circuit will decrease. Therefore, an embodiment of the present invention provides an inverter low-voltage detection circuit 12 to determine whether the UPS has an abnormality that may cause power outages by detecting the low-voltage state of the inverter circuit in the UPS. If the inverter low-voltage detection circuit 12 detects that the inverter circuit is in a low-voltage state (i.e., the output voltage of the inverter circuit is lower than a preset low-voltage value), it outputs a second abnormality signal to the integrated output circuit 14 to instruct the integrated output circuit 14 to output a control signal to the UPS, thereby ensuring uninterrupted power supply to the load.

[0043] Typically, the main control board (i.e., the DSP module) of a UPS is equipped with two power supplies: a main power supply and a backup power supply. When the main power supply is active, it powers the DSP module, and the DSP module controls the UPS circuitry in a normal mode. When the main power supply fails, the UPS switches the power supply to the DSP module from the main power supply to the backup power supply. To prevent power outages to the UPS load when the main power supply fails, embodiments of the present invention include a main power failure detection circuit 13. Upon detecting a main power failure, the circuit outputs a third abnormality signal to the integrated output circuit 14, instructing the integrated output circuit 14 to output a control signal to the UPS, thereby ensuring uninterrupted power supply to the load.

[0044] The control signal output by the integrated output circuit 14 is used to instruct the UPS to execute a shutdown protection action, or to instruct the UPS to execute a switching action from the inverter line to the bypass line.

[0045] As can be seen from the above description, the beneficial effects of the embodiments of the present invention are as follows: the embodiments of the present invention provide a software failure detection circuit to detect abnormal conditions of the DSP module, an inverter low voltage detection module to detect low voltage conditions of the inverter circuit, and a main control power supply failure detection circuit to detect abnormal conditions of the main control power supply. Thus, when a DSP abnormality, inverter circuit low voltage, or main control power supply abnormality occurs, the integrated output circuit can be quickly triggered to output a control signal, thereby ensuring uninterrupted power supply to the load as much as possible and improving the reliability of power supply to the load. Furthermore, the various detection circuits provided in the embodiments of the present invention also have synergistic effects. For example, when the software failure detection circuit fails, even if the DSP module is abnormal, the integrated output circuit will not output a first abnormality signal. However, according to the solution of the present application, even if the software failure detection circuit is unable to output the first abnormality signal, the inverter low voltage detection circuit will output a second abnormality signal due to the low voltage of the inverter circuit caused by the DSP module abnormality. Therefore, when the DSP module is abnormal, the integrated output circuit can be guaranteed to output the corresponding control signal, thereby ensuring uninterrupted power supply to the load and further improving the reliability of power supply to the load.

[0046] In one possible implementation, the integrated output circuit is specifically configured to:

[0047] After receiving the abnormal signal, the abnormal state of the bypass line in the target UPS is detected, and a control signal is output to the target UPS according to the abnormal state of the bypass line.

[0048] In this embodiment, after receiving the abnormal signal, the integrated output circuit can also detect the abnormal state of the UPS bypass line and determine the type of control signal output to the UPS according to the abnormal state of the bypass line.

[0049] In one possible implementation, the control signal includes a forced switching signal and a shutdown protection signal. The integrated output circuit is specifically used for:

[0050] When an abnormality is detected in the bypass line, a shutdown protection signal is output to the target UPS; and when a normality is detected in the bypass line, a forced switching signal is output to the target UPS.

[0051] The forced switching signal is used to instruct the target UPS to execute a switching action from the inverter line to the bypass line, and the shutdown protection signal is used to instruct the target UPS to execute a shutdown action.

[0052] In this embodiment, if the integrated output circuit detects an abnormality in the bypass line, indicating that power supply cannot be sustained even if switching to the bypass line, it can output a forced shutdown signal to the UPS, also known as a shutdown protection signal, to ensure the safety of the entire circuit. If the integrated output circuit detects that the bypass line is normal, it can also output a forced switching signal upon receiving the abnormality signal, controlling the UPS to switch from the inverter line to the bypass line.

[0053] In a possible implementation, the preset low voltage value is determined according to load characteristics of a target UPS common load.

[0054] In this embodiment, the load characteristic may be the minimum voltage value required for the load to operate, and the preset low voltage value may be determined based on the load characteristics of the common load of the UPS to ensure that the common load can be continuously powered.

[0055] In a possible implementation, the power supply line control device further includes: a processor.

[0056] Electronic switches are serially connected in the main paths of the software failure detection circuit, the inverter low voltage detection circuit, and the main control power failure detection circuit, and the processor is connected to each electronic switch.

[0057] The processor is used to control the electronic switch of the software failure detection circuit to be turned on according to the first preset cycle, control the controller of the inverter low voltage detection circuit to be turned on according to the second preset cycle, and control the main power failure detection circuit to be turned on according to the third preset cycle.

[0058] The first preset period is determined according to the abnormal frequency of the DSP module, the second preset period is determined according to the low voltage frequency of the output voltage, and the third preset period is determined according to the abnormal frequency of the main control power supply.

[0059] In this embodiment, an electronic switch is connected in series with the main circuit of each detection circuit. When the electronic switch is on, each detection circuit is on, and when the electronic switch is off, each detection circuit is off. The processor can control the conduction of each detection circuit by controlling the conduction state of each electronic switch.

[0060] Specifically, each detection circuit may correspond to a preset detection cycle (i.e., a first preset cycle, a second preset cycle, and a third preset cycle). The specific size of each preset cycle may be determined according to the corresponding abnormal / low voltage frequency. This method can save system resources while ensuring the reliability of load power supply.

[0061] In a possible implementation, the processor is further configured to:

[0062] The abnormal state of the software failure detection circuit is detected in real time, and the inverter low voltage detection circuit is immediately turned on when it is determined that the software failure detection circuit is abnormal.

[0063] In this embodiment, the processor can also detect the abnormal state of the software failure detection circuit. If the software failure detection circuit is abnormal (for example, it should output the first abnormal signal but does not output it), the inverter low voltage detection circuit can be quickly turned on to detect the low voltage state of the inverter line to ensure the timeliness of power supply abnormality processing and improve the reliability of load power supply.

[0064] In a possible implementation, the processor is further configured to:

[0065] The abnormal state of the main control power failure detection circuit is detected in real time, and the first preset cycle is lowered when it is determined that the main control power failure detection circuit is abnormal.

[0066] In this embodiment, the processor can also detect an abnormal state of the main power failure detection circuit. If the main power failure detection circuit is abnormal (for example, it should output a third abnormality signal but does not), the frequency of the software failure detection circuit is increased, which in turn increases the frequency of abnormality detection of the DSP module. This allows for rapid detection of any impact on the DSP module caused by the switchover between the main power supply and the backup power supply, thereby ensuring the reliability of load power supply. It should be noted that after the main power failure detection circuit fails, a situation may arise in which the UPS protection mechanism switches the DSP module's power supply to the backup power supply. However, the failure of the main power failure detection circuit prevents it from sending the third abnormality signal to the integrated output circuit, resulting in the UPS power supply line not switching. However, the circuit can still operate normally. In this situation, considering that the switchover of the DSP module's power supply from the main power supply to the backup power supply may affect the program unit in the DSP module, the frequency of the software failure detection circuit is increased and the first preset period is reduced, thereby improving the reliability of load power supply.

[0067] In one possible implementation, the inverter low-voltage detection circuit includes a comparator configured to compare the output voltage with a preset low-voltage value and output different signals. Specifically, when the output voltage of the inverter circuit is less than the preset low-voltage value, the comparator may output a second abnormality signal to the integrated output circuit. Optionally, the comparator may also output an abnormality indication signal to other circuits within the inverter low-voltage detection circuit, which in turn may output a second abnormality signal to the integrated output circuit based on the abnormality indication signal. This embodiment is not limited to this.

[0068] The power supply line control device also includes a processor, which is used to obtain the load characteristics of the current load of the target UPS in real time and control the preset low voltage value input to the comparator according to the load characteristics.

[0069] In this embodiment, the preset low voltage value can also be adjusted in real time through the control of the processor.

[0070] The preset low voltage value may be adjusted in the following manner:

[0071] The first method is to set a parallel-connected resistance circuit in the inverter low-voltage detection circuit. The input end of the resistance circuit is used to access the voltage signal, and the output end is used to output the preset low-voltage value to the comparator. Each branch of the parallel-connected resistance circuit is connected in series with a resistor and an electronic switch. The processor controls the addition / removal of the resistor by controlling the on / off state of the electronic switch in each branch, thereby affecting the size of the preset low-voltage value.

[0072] Second, the processor may directly output the preset low voltage value to the comparator, that is, the size of the preset low voltage value is directly determined by the processor.

[0073] In one possible implementation, the main control power failure detection circuit is specifically configured to:

[0074] The abnormal state of the main control power supply is detected by detecting the power supply state of the main control power supply corresponding to the DSP module in the target UPS.

[0075] Alternatively, the abnormal state of the main control power supply is detected by detecting the effective state of the backup power supply corresponding to the DSP module in the UPS.

[0076] In this embodiment, the abnormal state of the main control power supply can be detected in two ways:

[0077] First, directly detect the power supply device of the main power supply. For example, the power supply voltage of the main power supply can be directly obtained. When the power supply voltage of the main power supply is lower than its theoretical value, it is determined that the main power supply is abnormal.

[0078] Second, the abnormal state of the main power supply can be indirectly determined by determining the effectiveness of the backup power supply. The UPS protection mechanism automatically switches to the backup power supply to power the DSP module if the main power supply fails. Therefore, the abnormal state of the main power supply can be detected by detecting the effectiveness of the backup power supply. When the backup power supply is detected, the main power supply is considered abnormal.

[0079] In this embodiment, the sampling position of the power supply voltage of the main power supply corresponding to the DSP module can be set according to needs. The sampling position is different, and the theoretical value of the power supply voltage is also different. In this embodiment, the power supply voltages of multiple sampling positions can be selected to judge the abnormal state of the main power supply, or any power supply voltage can be selected to judge the abnormal state of the main power supply. There is no limitation here.

[0080] For example, the voltage input to the power supply circuit of the DSP module may be 15V, but the voltage required by the DSP module is 3.3V. In this case, the power supply circuit of the DSP module will convert the 15V voltage to 3.3V to power the DSP module. Based on this situation, when sampling the supply voltage to determine the abnormal state of the main control power supply, the voltage at the 15V voltage point can be sampled to determine the abnormal state of the main control power supply, the voltage at the 3.3V voltage point can also be sampled to determine the abnormal state of the main control power supply, or the voltage at both voltage points can be sampled to determine the abnormal state of the main control power supply.

[0081] In one possible implementation, the main power failure detection circuit can also simultaneously detect the abnormal state of the power supply voltage of the inverter low voltage detection circuit, and also output a third abnormal signal to the integrated output circuit when the power supply voltage of the inverter low voltage detection circuit is abnormal.

[0082] In addition, the present invention also provides a UPS system, which includes: a target UPS and the power supply line control device described above.

[0083] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A power supply line control device, characterized in that: include: Software failure detection circuit, inverter low voltage detection circuit, main control power failure detection circuit, and integrated output circuit; The software failure detection circuit is used to detect an abnormal state of the DSP module in the target UPS, and outputs a first abnormality signal to the integrated output circuit when the DSP module is detected to be abnormal; the inverter low voltage detection circuit is used to detect the output voltage of the inverter circuit in the target UPS, and outputs a second abnormality signal to the integrated output circuit when the output voltage is detected to be lower than a preset low voltage value; the main power failure detection circuit is used to detect an abnormal state of the main power supply corresponding to the DSP module in the target UPS, and outputs a third abnormality signal to the integrated output circuit when the main power supply is detected to be abnormal; The integrated output circuit is used to output a control signal to the target UPS after receiving the abnormal signal; Wherein, the abnormal signal is a first abnormal signal, a second abnormal signal, or a third abnormal signal; The power supply line control device further includes: a processor; The main circuits of the software failure detection circuit, the inverter low voltage detection circuit, and the main control power failure detection circuit are all connected in series with electronic switches, and the processor is connected to each electronic switch; The processor is configured to control the electronic switch of the software failure detection circuit to be turned on according to a first preset period, control the controller of the inverter low voltage detection circuit to be turned on according to a second preset period, and control the main control power failure detection circuit to be turned on according to a third preset period; The first preset period is determined according to the abnormal frequency of the DSP module, the second preset period is determined according to the low voltage frequency of the output voltage, and the third preset period is determined according to the abnormal frequency of the main control power supply.

2. The power supply line control device according to claim 1, wherein: The integrated output circuit is specifically used for: After receiving the abnormal signal, the abnormal state of the bypass line in the target UPS is detected, and a control signal is output to the target UPS according to the abnormal state of the bypass line.

3. The power supply line control device according to claim 2, wherein: The control signal includes a forced switching signal and a shutdown protection signal; the integrated output circuit is specifically used for: outputting a shutdown protection signal to the target UPS when detecting that the bypass line is abnormal, and outputting a forced switching signal to the target UPS when detecting that the bypass line is normal; The forced switching signal is used to instruct the target UPS to perform a switching action from the inverter line to the bypass line, and the shutdown protection signal is used to instruct the target UPS to perform a shutdown action.

4. The power supply line control device according to claim 1, wherein: The preset low voltage value is determined according to the load characteristics of the target UPS common load.

5. The power supply line control device according to claim 4, characterized in that: The processor is further configured to: The abnormal state of the software failure detection circuit is detected in real time, and the inverter low voltage detection circuit is immediately turned on when it is determined that the software failure detection circuit is abnormal.

6. The power supply line control device according to claim 4, characterized in that: The processor is further configured to: The abnormal state of the main control power failure detection circuit is detected in real time, and the first preset period is reduced when it is determined that the main control power failure detection circuit is abnormal.

7. The power supply line control device according to claim 1, wherein: The inverter low voltage detection circuit includes a comparator, and the comparator is used to compare the output voltage and the preset low voltage value; the power supply line control device also includes a processor; The processor is used to obtain the load characteristics of the current load of the target UPS in real time, and control the preset low voltage value input to the comparator according to the load characteristics.

8. The power supply line control device according to any one of claims 1 to 7, characterized in that: The main control power failure detection circuit is specifically used for: Detecting an abnormal state of the main power supply by detecting the power supply state of the main power supply corresponding to the DSP module in the target UPS; Alternatively, the abnormal state of the main control power supply is detected by detecting the effective state of the backup power supply corresponding to the DSP module in the UPS; The backup power supply is used to supply power to the DSP module when the main power supply fails.

9. A UPS system, characterized in that: include: A target UPS and a power supply line control device according to any one of claims 1 to 8.

Images