CN111614070B - Bypass protection circuit, method and uninterrupted power supply - Google Patents
Bypass protection circuit, method and uninterrupted power supply Download PDFInfo
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- CN111614070B CN111614070B CN202010473653.7A CN202010473653A CN111614070B CN 111614070 B CN111614070 B CN 111614070B CN 202010473653 A CN202010473653 A CN 202010473653A CN 111614070 B CN111614070 B CN 111614070B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention is applicable to the technical field of uninterruptible power supplies, and provides a bypass protection circuit, a bypass protection method and an uninterruptible power supply. The circuit comprises: the device comprises an input filtering module, a rectification inversion module, an output filtering module and a voltage detection module; the input filtering module and the output filtering module respectively comprise a filtering capacitor and a voltage bleeder component; after power failure, the voltage detection module detects a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of the filter capacitor of the output filter module, and when the first voltage exceeds a preset input voltage threshold value, the voltage detection module controls a voltage bleeder component of the input filter module to bleed the first voltage into a first preset voltage; the difference value between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module. The circuit of the invention has simple structure and low cost, can effectively protect the bypass module, prevent the bypass rectifier from being damaged and save electric energy.
Description
Technical Field
The invention belongs to the technical field of uninterruptible power supplies, and particularly relates to a bypass protection circuit and method and an uninterruptible power supply.
Background
A typical UPS (Uninterruptible Power System/Uninterruptible Power Supply) can generally operate in three modes: the power supply system comprises a mains supply mode, a battery inversion mode and a bypass mode. When the UPS inverter fails or the battery finishes discharging, the UPS works in a bypass mode to supply power to the load to the maximum extent. However, in the prior art, when the bypass mode is started under the condition of power failure such as mains supply power failure or UPS inverter failure, the bypass module is easily damaged, and particularly, the bypass rectifier is easily broken down, so that the bypass cannot normally supply power.
Disclosure of Invention
In view of this, embodiments of the present invention provide a bypass protection circuit, a bypass protection method, and an uninterruptible power supply, so as to solve a problem in the prior art that a bypass rectifier is vulnerable to damage when the uninterruptible power supply is powered on.
A first aspect of an embodiment of the present invention provides a bypass protection circuit, including: the device comprises an input filtering module, a rectification inversion module, an output filtering module and a voltage detection module;
the input filtering module is suitable for being connected with a mains supply and a bypass module and is also connected with the output filtering module through the rectification inversion module; the output filtering module is also adapted to be connected with the bypass module and an external load; the voltage detection module is connected with the input filtering module and the output filtering module; the input filtering module and the output filtering module respectively comprise a filtering capacitor and a voltage bleeder component;
after power failure, the voltage detection module is used for detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module, and when the first voltage exceeds a preset input voltage threshold value, the voltage detection module controls a voltage bleeder component of the input filter module to bleed the first voltage to a first preset voltage; the difference between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module.
Optionally, the relationship between the first preset voltage and the first voltage is:
wherein, UtFor the first predetermined voltage, U0Is the first voltage.
Optionally, the voltage detection module is further configured to:
after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module, and when the second voltage exceeds a preset output voltage threshold, controlling a voltage bleeder element of the input filter module to bleed the first voltage to a first preset voltage and controlling a voltage bleeder element of the output filter module to bleed the second voltage to a second preset voltage; the difference value between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module.
Optionally, the input filtering module comprises: the first capacitor, the first resistor and the first inductor;
the first end of the first capacitor is connected with the mains supply, the bypass module, the first end of the first inductor and the first end of the first resistor, and the second end of the first capacitor is grounded; the second end of the first resistor is connected with the second end of the first capacitor; and the second end of the first inductor is connected with the output filtering module through the rectification inversion module.
Optionally, the input filtering module further comprises: a first switching element;
the first end of the first switch element is connected with the first end of the first capacitor, the second end of the first switch element is connected with the first end of the first resistor, and the second end of the first resistor is connected with the second end of the first capacitor.
Optionally, the output filtering module includes: the second capacitor, the second resistor and the second inductor;
the first end of the second capacitor is connected with the bypass module, the second end of the second inductor and the first end of the second resistor, and the second end of the second capacitor is grounded; a second end of the second resistor is connected with a second end of the second capacitor; and the first end of the second inductor is connected with the input filtering module through the rectification and inversion module.
Optionally, the output filtering module further includes: a second switching element;
the first end of the second switch element is connected with the first end of the second capacitor, the second end of the second switch element is connected with the first end of the second resistor, and the second end of the second resistor is connected with the second end of the second capacitor.
Optionally, the rectification and inversion module includes: the protection circuit comprises an alternating current-direct current module, a direct current-alternating current module and a protection capacitor;
the input end of the alternating current-direct current module is connected with the input filtering module, and the output end of the alternating current-direct current module is connected with the input end of the direct current-alternating current module and the first end of the protection capacitor; the output end of the direct current-alternating current module is connected with the output filtering module; and the second end of the protection capacitor is grounded.
A second aspect of the embodiments of the present invention provides a bypass protection method, which is applicable to a bypass protection circuit including an input filter module, a rectification inverter module, an output filter module, and a voltage detection module, where the input filter module and the output filter module both include a filter capacitor and a voltage bleeder element, and the method includes:
after power failure, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module;
when the first voltage exceeds a preset input voltage threshold, controlling a voltage bleeder component of the input filter module to bleed the first voltage to a first preset voltage; the difference between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module.
Optionally, the bypass protection method further comprises:
after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module;
when the second voltage exceeds a preset output voltage threshold, controlling a voltage bleeder element of the input filter module to bleed the first voltage to a first preset voltage, and controlling a voltage bleeder element of the output filter module to bleed the second voltage to a second preset voltage; the difference value between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module.
A third aspect of an embodiment of the present invention provides an uninterruptible power supply, including a bypass module, and further including any one of the bypass protection circuits provided in the first aspect of the embodiment described above, connected to the bypass module.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the circuit comprises an input filtering module, a rectification inversion module, an output filtering module and a voltage detection module, and is simple in structure and low in cost; when a main power supply circuit of the uninterruptible power supply is powered off, the voltage detection module detects a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module, when the first voltage exceeds a preset input voltage threshold value, the voltage release element of the input filter module is controlled to release the first voltage into a first preset voltage, and the difference value between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a bypass protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another bypass protection circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, the present embodiment provides a bypass protection circuit, including: the input filter module 100, the rectification inverter module 200, the output filter module 300 and the voltage detection module 400. The input end of the input filter module 100 is suitable for being connected with the mains supply and the input end of the bypass module 600, and the output end of the input filter module 100 is also connected with the input end of the output filter module 300 through the rectification and inversion module 200; the output of the output filter module 300 is adapted to be connected to the output of the bypass module 600 and an external load; the detection end of the voltage detection module 400 is connected to both the input filter module 100 and the output filter module 300; the input filter module 100 and the output filter module 300 each include a filter capacitor and a voltage dropping element. The bypass module 600 and the rectification inverter module 200 of the present embodiment are homologous.
Specifically, after power failure, for example, when the utility power is cut off or the rectification inverter module 200 fails, that is, before the uninterruptible power supply is restarted, the voltage detection module 400 detects a first voltage across the filter capacitor of the input filter module 100 and a second voltage across the filter capacitor of the output filter module 300, and determines whether the first voltage meets a preset input voltage threshold; when the first voltage exceeds a preset input voltage threshold, the voltage detection module 400 controls a voltage leakage element of the input filter module 100 to reduce the first voltage to a first preset voltage, so that the voltage at two ends of the bypass module 600 is within a certain voltage difference, and a large back-flow current formed on a bypass during starting is prevented from damaging a bypass rectifier; the difference between the first preset voltage and the second voltage is less than the maximum voltage difference acceptable by the bypass module 600.
The bypass protection circuit has simple circuit structure and low cost; after the power is cut off, the voltage detection module 400 detects the first voltage input to the filtering module 100 and the second voltage output to the filtering module 300, when the first voltage exceeds the preset input voltage threshold, the voltage bleeder component of the input filtering module 100 is controlled to bleed the first voltage into the first preset voltage, the difference value between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module 600, namely, the voltage difference between the input commercial power and the output alternating current meets the requirement of the bypass module 600, the bypass module 600 is effectively protected, the damage of a bypass rectifier is prevented, the reliability of the uninterruptible power supply is increased, meanwhile, the embodiment also controls the size of the bled voltage, the whole bleed is not needed, and the electric energy is saved.
Optionally, the relationship between the first preset voltage and the first voltage is:
wherein, UtFor the first predetermined voltage, U0Is the first voltage. For example, before the bypass module 600 is started, the voltage detection module 400 detects a first voltage across the filter capacitor of the input filter module 100, and when the first voltage exceeds a preset input voltage threshold, the voltage detection module 400 controls the voltage dropping element of the input filter module 100 to lower the first voltage Ut to a first preset voltage
The voltage at the two ends of the bypass module 600 is within a certain voltage difference, so that the bypass rectifier is prevented from being damaged by large reverse current formed when the bypass module 600 is started, and the bypass rectifier is effectively protected. In this embodiment, the voltage value of the first preset voltage is not specifically limited, and may be 30% of the first voltage, or 80% of the first voltage, as long as the difference between the first preset voltage and the first voltage does not exceed the maximum voltage difference acceptable by the bypass rectifier.
Optionally, the voltage detection module 400 of this embodiment may be further configured to: after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module 100 and a second voltage at two ends of a filter capacitor of the output filter module 300, and when the second voltage exceeds a preset output voltage threshold, controlling a voltage bleeder element of the input filter module 100 to bleed the first voltage to a first preset voltage, and controlling a voltage bleeder element of the output filter module 300 to bleed the second voltage to a second preset voltage; the difference between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module 600.
Illustratively, in the case of debugging or allowing power down, and when the output voltage of the output filter module 300 is a negative voltage or a positive voltage, the power supply load outputs power down, and then, when the input voltage of the commercial power is out of phase with the voltage at the time of the previous power-off output, the voltage difference between the two ends of the bypass module 600 is very large at this time, therefore, before the output is powered off, the voltage detection module 400 controls the voltage dropping element of the input filter module 100 to drop the first voltage to the first preset voltage, and controls the voltage dropping element of the output filter module 300 to drop the second voltage to a second preset voltage, or before the bypass module 600 is started, the voltage dropping element of the input filter module 100 is controlled to drop the first voltage to a first preset voltage, and the voltage detection module 400 controls the voltage dropping element of the output filter module 300 to drop the second voltage to a second preset voltage.
Alternatively, the resistance of the voltage bleeder component of the input filter module 100 may be variable, that is, the voltage detection module 400 may control the resistance of the voltage bleeder component of the input filter module 100 to be variable according to a difference between the first voltage and a preset input voltage threshold, for example, the resistance of the voltage bleeder component may be controlled to change the discharging time, increase the discharging speed in a case of a specified discharging voltage, or expand the dischargeable point voltage in a specified time. The specific structure of the voltage detection module 400 is not limited in this embodiment, and may be a voltage detection chip or the like.
In an embodiment of the present invention, referring to fig. 1, the input filtering module 100 of the present embodiment may include: a first capacitor C1, a first resistor R1 and a first inductor L1; a first end of the first capacitor C1 is connected to the mains supply, the bypass module 600, a first end of the first inductor L1 and a first end of the first resistor R1, and a second end of the first capacitor C1 is grounded; a second end of the first resistor R1 is connected with a second end of the first capacitor C1; the second end of the first inductor L1 is connected to the output filter module 300 through the rectification and inversion module 200. For example, the first resistor R1 of the present embodiment may be a resistor with a small resistance, for example, the first resistor R1 may have a resistance of 1K Ω or less, and is a voltage-resistant and current-resistant resistor, which is suitable for use in a high-voltage power supplyThe resistance in the range can control the discharge time within 1S or even shorter, and the first voltage discharge is completed until
Optionally, referring to fig. 2, the input filtering module 100 of this embodiment may further include: the first switching element K1; a first terminal of the first switching element K1 is connected to a first terminal of the first capacitor C1, a second terminal of the first switching element K1 is connected to a first terminal of the first resistor R1, and a second terminal of the first resistor R1 is connected to a second terminal of the first capacitor C1. The first switch element K1 is configured to control conduction of the first resistor R1, that is, when the first voltage exceeds a preset input voltage threshold, the voltage detection module 400 controls the first switch element K1 to be turned on, and the first resistor R1 discharges the voltage of the first capacitor C1.
In an embodiment of the present invention, referring to fig. 1, the output filtering module 300 of the embodiment may include: a second capacitor C2, a second resistor R2 and a second inductor L2; a first end of the second capacitor C2 is connected to the bypass module 600, a second end of the second inductor L2 and a first end of the second resistor R2, and a second end of the second capacitor C2 is grounded; a second end of the second resistor R2 is connected with a second end of the second capacitor C2; a first end of the second inductor L2 is connected to the input filter module 100 through the rectification and inversion module 200. For example, the second resistor R2 of the present embodiment may be a resistor with a smaller resistance, for example, the resistance of the second resistor R2 may be 1K Ω or less, and is a voltage-resistant and current-resistant resistor, and the resistor within this range may control the discharge time within 1S or even shorter, and complete the second voltage discharge to the end of the second voltage discharge
U1Is a second voltage.
Optionally, referring to fig. 2, the output filtering module 300 may further include: the second switching element K2; a first terminal of the second switching element K2 is connected to a first terminal of the second capacitor C2, a second terminal of the second switching element K2 is connected to a first terminal of the second resistor R2, and a second terminal of the second resistor R2 is connected to a second terminal of the second capacitor C2. The second switch element K2 is configured to control conduction of the second resistor R2, that is, when a difference between the first voltage and the second voltage exceeds a preset difference, the voltage detection module 400 controls the second switch element K2 to close, and the second resistor R2 discharges the voltage of the second capacitor C2.
The first switching element K1 and the second switching element K2 in the above embodiments may be isolation switches. The first switch element K1 and the second switch element K2 can isolate the received driving signals, reduce signal interference, meet safety requirements and enable the whole circuit to have isolation characteristics.
Alternatively, referring to fig. 1, the rectification and inversion module 200 may include: the protection circuit comprises an alternating current-direct current module, a direct current-alternating current module and a protection capacitor C; the input end of the alternating current-direct current module is connected with the input filter module 100, and the output end of the alternating current-direct current module is connected with the input end of the direct current-alternating current module and the first end of the protection capacitor C; the output end of the DC-AC module is connected with the output filtering module 300; the second terminal of the protection capacitor C is grounded. The protection capacitor C is used for filtering the output voltage of the alternating current-direct current module, so that damage to a circuit or electric equipment is prevented, and the quality of output electric energy is improved.
The following describes the working process of the bypass protection circuit according to the embodiment of the present invention:
the utility power is input into the bypass, when the UPS is powered on, the input filtering module 100 filters input electric energy, the output filtering module 300 filters output electric energy, the first capacitor C1 and the second capacitor C2 store certain electric energy, if the UPS is powered off suddenly, for example, the rectification and inversion module 200 fails, there may be any time of outputting a sinusoidal waveform, and at this time, the output voltage of the second capacitor C2 is consistent with the voltage at the time of power off, and may be a peak value (for example, 311V), or may be a valley value (-311V), or may be a value between the peak value and the valley value. When the next power-on is performed, the voltage at the power-on time is the valley value of the commercial power, and when the output voltage of the second capacitor C2 is at the voltage peak value, the voltage at the input side of the bypass module 600 is lower than the voltage at the output side, which easily causes current back-flow, and the voltage difference between the two ends is large (622V to the maximum), which causes that both the back-flow current and the current change rate are large, and damages the bypass rectifier.
For example, when the input end of the input filter module 100 is open or the contactor is open, the first capacitor C1 and the second capacitor C2 are both at 310V, when the input end of the input filter module 100 is closed, if the voltage of the incoming mains is-310V, and the potential of the first capacitor C1 is maintained close to 310V (no power is consumed), two voltage differences 620V are generated, the input current passes through the bypass module 600 to the output filter module 300, and the current flowing through the bypass module 600 is huge, which causes damage to the bypass rectifier. Therefore, the voltage detecting module 400 is required to detect the first voltage across the first capacitor C1, and when the first voltage exceeds the preset input voltage threshold, the first resistor R1 is controlled to reduce the first voltage to the first preset voltage, so that the voltage across the bypass module 600 is within a certain voltage difference.
For example, the bypass operation is powered down, and the first capacitor C1 and the second capacitor C2 are both at 310V. When the commercial power recovers and provides a voltage of-310V, at this time, the first voltage of the first capacitor C1 and the second voltage of the second capacitor C2 are both large, and the voltage difference between the voltage across the first capacitor C1 and the voltage at the input terminal of the input filter module 100 is also large, so that the back-sink current impacts the bypass module 600. At this time, the voltage detection module 400 detects a first voltage across the filter capacitor of the input filter module 100 and a second voltage across the filter capacitor of the output filter module 300, and when the first voltage exceeds a preset input voltage threshold, the voltage detection module 400 controls the voltage bleeding element of the input filter module 100 to reduce the first voltage to a first preset voltage, so that the voltages across the bypass module 600 are within a certain voltage difference.
In the above embodiment, after the power failure, the voltage detection module 400 detects the first voltage input to the filtering module 100 and the second voltage output to the filtering module 300, and when the first voltage exceeds the preset input voltage threshold, the voltage bleeder component of the input filtering module 100 is controlled to bleed the first voltage to the first preset voltage, and a difference between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module 600, that is, the voltage difference between the input commercial power and the output alternating current satisfies the bypass module 600, so that the bypass module 600 is effectively protected, the bypass rectifier is prevented from being damaged, the reliability of the uninterruptible power supply is increased, and meanwhile, the embodiment also controls the size of the bled voltage, does not need to be bled completely, and saves electric energy.
Corresponding to the bypass protection circuit in the above embodiment, the present embodiment provides a bypass protection method, which is detailed as follows:
after the power is off, a first voltage across the filter capacitor of the input filter module 100 and a second voltage across the filter capacitor of the output filter module 300 are detected.
When the first voltage exceeds a preset input voltage threshold, controlling a voltage dropping element of the input filter module 100 to drop the first voltage to a first preset voltage; the difference between the first preset voltage and the second voltage is less than the maximum voltage difference acceptable by the bypass module 600.
In one embodiment of the present invention, the bypass protection method further comprises:
and after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module.
When the second voltage exceeds a preset output voltage threshold, controlling a voltage bleeder element of the input filter module to bleed the first voltage to a first preset voltage, and controlling a voltage bleeder element of the output filter module to bleed the second voltage to a second preset voltage; the difference value between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module.
In an embodiment of the present invention, the relationship between the first preset voltage and the first voltage is:
wherein, UtFor the first predetermined voltage, U0Is the first voltage.
Optionally, the bypass protection method of this embodiment may further include: the resistance value of the voltage bleeder component of the input filter module 100 is controlled to change according to the difference between the first voltage and the preset input voltage threshold, for example, the discharge time may be changed by controlling the resistance value of the voltage bleeder component, the discharge speed is increased under the condition of the specified discharge voltage, or the dischargeable point voltage is expanded within the specified time.
In the bypass protection method, after power failure, a first voltage input to the filter module 100 and a second voltage output to the filter module 300 are detected, when the first voltage exceeds a preset input voltage threshold, the voltage bleeder component of the input filter module 100 is controlled to bleed the first voltage to the first preset voltage, and a difference between the first preset voltage and the second voltage is smaller than a maximum voltage difference acceptable by the bypass module 600, so that the voltage difference between input commercial power and output alternating current meets the requirement of the bypass module 600, the bypass module 600 is effectively protected, damage of a bypass rectifier is prevented, reliability of the uninterruptible power supply is improved, and meanwhile, the embodiment also controls the size of the bled voltage, does not need to be fully bled, and electric energy is saved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The embodiment provides an uninterruptible power supply, which includes a bypass module 600, and further includes any one of the bypass protection circuits provided in the above embodiments, and also has the beneficial effects of any one of the bypass protection circuits described above.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A bypass protection circuit, comprising: the device comprises an input filtering module, a rectification inversion module, an output filtering module and a voltage detection module;
the input filtering module is suitable for being connected with a mains supply and a bypass module and is also connected with the output filtering module through the rectification inversion module; the output filtering module is also adapted to be connected with the bypass module and an external load; the voltage detection module is connected with the input filtering module and the output filtering module; the input filtering module and the output filtering module respectively comprise a filtering capacitor and a voltage bleeder component;
after power failure, the voltage detection module is used for detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module, and when the first voltage exceeds a preset input voltage threshold value, the voltage detection module controls a voltage bleeder component of the input filter module to bleed the first voltage to a first preset voltage; the difference between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module.
2. The bypass protection circuit of claim 1, wherein the first predetermined voltage is related to the first voltage by:
wherein, UtFor the first predetermined voltage, U0Is the first voltage.
3. The bypass protection circuit of claim 1, wherein the voltage detection module is further to:
after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module, and when the second voltage exceeds a preset output voltage threshold value, controlling a voltage bleeder component of the input filter module to bleed the first voltage to a first preset voltage and controlling a voltage bleeder component of the output filter module to bleed the second voltage to a second preset voltage; the difference value between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module.
4. The bypass protection circuit of any of claims 1-3, wherein the input filtering module comprises: the first capacitor, the first resistor and the first inductor;
the first end of the first capacitor is connected with the mains supply, the bypass module, the first end of the first inductor and the first end of the first resistor, and the second end of the first capacitor is grounded; the second end of the first resistor is connected with the second end of the first capacitor; and the second end of the first inductor is connected with the output filtering module through the rectification inversion module.
5. The bypass protection circuit of claim 4, wherein the input filter module further comprises: a first switching element;
the first end of the first switch element is connected with the first end of the first capacitor, the second end of the first switch element is connected with the first end of the first resistor, and the second end of the first resistor is connected with the second end of the first capacitor.
6. The bypass protection circuit of any of claims 1 to 3, wherein the output filtering module comprises: the second capacitor, the second resistor and the second inductor;
the first end of the second capacitor is connected with the bypass module, the second end of the second inductor and the first end of the second resistor, and the second end of the second capacitor is grounded; a second end of the second resistor is connected with a second end of the second capacitor; and the first end of the second inductor is connected with the input filtering module through the rectification and inversion module.
7. The bypass protection circuit of claim 6, wherein the output filtering module further comprises: a second switching element;
the first end of the second switch element is connected with the first end of the second capacitor, the second end of the second switch element is connected with the first end of the second resistor, and the second end of the second resistor is connected with the second end of the second capacitor.
8. A bypass protection method is suitable for a bypass protection circuit comprising an input filter module, a rectification inversion module, an output filter module and a voltage detection module, wherein the input filter module and the output filter module both comprise a filter capacitor and a voltage bleeder component; the output filtering module is also adapted to be connected with the bypass module and an external load; the voltage detection module is connected with the input filtering module and the output filtering module; the bypass protection method comprises the following steps:
after power failure, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module;
when the first voltage exceeds a preset input voltage threshold, controlling a voltage bleeder component of the input filter module to bleed the first voltage to a first preset voltage; the difference between the first preset voltage and the second voltage is smaller than the maximum voltage difference acceptable by the bypass module.
9. The bypass protection method of claim 8, wherein the bypass protection method further comprises:
after the external load is powered off, detecting a first voltage at two ends of a filter capacitor of the input filter module and a second voltage at two ends of a filter capacitor of the output filter module;
when the second voltage exceeds a preset output voltage threshold, controlling a voltage bleeder element of the input filter module to bleed the first voltage to a first preset voltage, and controlling a voltage bleeder element of the output filter module to bleed the second voltage to a second preset voltage; the difference value between the first preset voltage and the second preset voltage is smaller than the maximum voltage difference acceptable by the bypass module.
10. An uninterruptible power supply comprising a bypass module, characterized in that it further comprises a bypass protection circuit according to any of claims 1 to 7 connected to the bypass module.
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