CN110829575A - Slow-start bus circuit, method and uninterruptible power supply - Google Patents
Slow-start bus circuit, method and uninterruptible power supply Download PDFInfo
- Publication number
- CN110829575A CN110829575A CN201911012984.4A CN201911012984A CN110829575A CN 110829575 A CN110829575 A CN 110829575A CN 201911012984 A CN201911012984 A CN 201911012984A CN 110829575 A CN110829575 A CN 110829575A
- Authority
- CN
- China
- Prior art keywords
- module
- bypass
- bus
- mains supply
- slow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Abstract
The invention is applicable to the technical field of uninterruptible power supplies, and provides a slow-start bus circuit, a slow-start bus method and an uninterruptible power supply. The circuit comprises: the system comprises a rectification inversion module, a commercial power slow start module, a bypass slow start module and a control module, wherein the rectification inversion module comprises a bus capacitor; when the mains supply is abnormal, the control module controls the bypass slow start module to be closed, bypass input charges the bus capacitor through the bypass slow start module, the bus voltage of the bus capacitor is obtained, and the bypass module is controlled to be conducted when the bus voltage reaches a first preset voltage; when the mains supply is normal, the control module controls the mains supply slow-start module to be closed, the mains supply charges the bus capacitor through the mains supply slow-start module, and the rectification inversion module is controlled to be switched on when the bus voltage reaches a second preset voltage. The circuit of the invention has simple structure, reduces the use amount of contactors, lowers the cost and effectively avoids the damage of the bypass module and the inversion module.
Description
Technical Field
The invention belongs to the technical field of uninterruptible power supplies, and particularly relates to a slow-start bus circuit, a slow-start bus 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 mains supply is switched to the bypass supply or the bypass supply is switched to the mains supply, the power supply circuit before switching is easily damaged in the switching process, and an electronic device is broken down.
Disclosure of Invention
In view of this, embodiments of the present invention provide a slow-start bus circuit, a method and an uninterruptible power supply, so as to solve the problem that when an uninterruptible power supply switches a power supply circuit in the prior art, an electronic device of the power supply circuit before switching is easily broken down.
A first aspect of an embodiment of the present invention provides a slow-start bus circuit, including: the system comprises a rectification inversion module, a commercial power slow start module, a bypass slow start module and a control module; the rectification inversion module comprises a bus capacitor;
the input end of the rectification inversion module is suitable for being connected with a mains supply, and the output end of the rectification inversion module is suitable for being connected with an external load; the input end of the commercial power slow start module is suitable for being connected with commercial power, and the output end of the commercial power slow start module is connected with the bus capacitor in parallel; the input end of the bypass slow start module is suitable for being connected with the bypass input, and the output end of the bypass slow start module is connected with the bus capacitor in parallel; the input end of the bypass module is suitable for being connected with a bypass input, and the output end of the bypass module is suitable for being connected with the external load; the control module is connected with the rectification inversion module, the commercial power slow start module, the bypass module and the bypass slow start module;
when the mains supply is abnormal, the control module is used for controlling the bypass slow start module to be closed, and the bypass input charges the bus capacitor through the bypass slow start module; the control module is further used for obtaining the bus voltage of the bus capacitor and controlling the bypass module to be conducted when the bus voltage reaches a first preset voltage;
when mains supply is normal, control module is used for controlling the commercial power is opened the module closure slowly, and the commercial power passes through the commercial power is opened the module slowly and is done bus capacitor charges, control module still is used for acquireing bus capacitor's busbar voltage controls when busbar voltage reaches second preset voltage rectifier and inverter module switches on.
Optionally, the first preset voltage is:
U1≥U0·1.732·80％
wherein, U1For the first predetermined voltage, U0Is the voltage of the mains supply.
Optionally, after the bypass module is controlled to be turned on when the bus voltage reaches a first preset voltage, the control module is further configured to: controlling the bypass slow start module to be disconnected;
or, after the rectification inverter module is controlled to be switched on when the bus voltage reaches a second preset voltage, the control module is further configured to: and controlling the commercial power slow start module to be disconnected.
Optionally, the utility power slow-start module includes: a first switching element, a first current limiting unit and a first rectifying unit;
the first end of the first switching element is suitable for being connected with a mains supply, and the second end of the first switching element is connected with the first end of the first current limiting unit; the second end of the first current limiting unit is connected with the input end of the first rectifying unit; the output end of the first rectifying unit is connected with the bus capacitor in parallel.
Optionally, the bypass slow-start module includes: a second switching element, a second current limiting unit and a second rectifying unit;
a first end of the second switching element is suitable for being connected with a bypass input, and a second end of the second switching element is connected with a first end of the second current limiting unit; the second end of the second current limiting unit is connected with the input end of the second rectifying unit; and the output end of the second rectifying unit is connected with the bus capacitor in parallel.
Optionally, the slow start bus circuit further includes: a first capacitor and a first inductor;
the first end of the first inductor is suitable for being connected with a mains supply, and the second end of the first inductor is connected with the first end of the first capacitor, the input end of the rectification inverter module and the input end of the mains supply slow start module; and the second end of the first capacitor is connected with a zero line.
Optionally, the slow start bus circuit further includes: a second capacitor and a second inductor;
the first end of the second inductor is connected with the output end of the rectification inversion module, the second end of the second inductor is suitable for being connected with the external load, and the second end of the second inductor is also connected with the first end of the second capacitor; and the second end of the second capacitor is connected with a zero line.
A second aspect of the embodiments of the present invention provides an uninterruptible power supply, including the slow-start bus circuit as described in any one of the first aspect of the embodiments.
A third aspect of an embodiment of the present invention provides a method for restarting a bus slowly, which is applicable to a single uninterruptible power supply, and includes:
when the mains supply is abnormal, the bypass slow start module is controlled to be closed, so that the bypass input charges the bus capacitor through the bypass slow start module; acquiring the bus voltage of the bus capacitor, and controlling the bypass module to be conducted when the bus voltage reaches a first preset voltage;
or when the mains supply is normal, the mains supply slow start module is controlled to be closed, and the mains supply charges the bus capacitor through the mains supply slow start module; and acquiring the bus voltage of the bus capacitor, and controlling the rectification inversion module to be conducted when the bus voltage reaches a second preset voltage.
A fourth aspect of the embodiments of the present invention provides a method for starting a bus slowly, which is applicable to at least two uninterruptible power supplies, and includes:
when the mains supply of each uninterruptible power supply is abnormal, controlling a bypass slow start module corresponding to each uninterruptible power supply to be closed so that the bypass input of each uninterruptible power supply charges a corresponding bus capacitor through the corresponding bypass slow start module; acquiring the bus voltage of each bus capacitor, and controlling the corresponding bypass module to be conducted when the bus voltage reaches a first preset voltage;
or when the mains supply of each uninterruptible power supply is normal, controlling the closing of the corresponding mains supply slow-start module of each uninterruptible power supply so as to charge the corresponding bus capacitor by the mains supply of each uninterruptible power supply through the corresponding mains supply slow-start module; acquiring the bus voltage of each bus capacitor, and controlling the corresponding rectification inverter module to be conducted when the bus voltage reaches a second preset voltage;
or, when the mains supply of one uninterruptible power supply is abnormal and the mains supply of the other uninterruptible power supply is normal, the bypass slow-start module of the uninterruptible power supply with the abnormal mains supply is controlled to be closed, so that bypass input charges for the corresponding bus capacitor through the bypass slow-start module, the bypass module is controlled to be conducted when the corresponding bus voltage reaches a first preset voltage, and meanwhile, the mains supply slow-start module corresponding to the uninterruptible power supply with the normal mains supply is controlled to be closed, so that the mains supply charges for the corresponding bus capacitor through the mains supply slow-start module, and the rectification inversion module is controlled to be conducted when the corresponding bus voltage reaches a second preset voltage.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the power supply system comprises a rectification inverter module, a mains supply slow start module, a bypass slow start module and a control module, wherein the rectification inverter module comprises a bus capacitor, the circuit structure is simple, the number of contactors is reduced, and the cost is low; when the mains supply is abnormal, the bypass slow start module is controlled to be closed, the bypass input charges the bus capacitor through the bypass slow start module, and the bypass module is controlled to be conducted when the bus voltage reaches a first preset voltage, so that the damage of devices of the bus capacitor and the rectification inversion module is avoided; when the mains supply is normal, the mains supply is controlled to be closed through the slow start module, the mains supply charges a bus capacitor through the slow start module, and the rectification inversion module is controlled to be switched on when the bus voltage reaches a second preset voltage, so that the damage of the bypass module is effectively prevented, and the reliability of the uninterruptible power supply is improved.
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 slow start bus circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another slow start bus 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 slow start bus circuit provided in this embodiment includes: the system comprises a rectification inversion module 100, a commercial power slow start module 200, a bypass module 300, a bypass slow start module 400 and a control module 500; the rectification inverter module 100 comprises a bus capacitor Cr; the input end of the rectification inversion module 100 is suitable for being connected with the mains supply, and the output end of the rectification inversion module is suitable for being connected with an external load; the input end of the commercial power slow start module 200 is suitable for being connected with commercial power, and the output end is connected with the bus capacitor in parallel; the input end of the bypass slow start module 400 is suitable for being connected with the bypass input, and the output end of the bypass slow start module is connected with the bus capacitor Cr in parallel; the bypass module 300 has an input adapted to be connected to a bypass input and an output adapted to be connected to an external load; the control module 500 is connected with the rectification inverter module 100, the commercial power slow start module 200, the bypass module 300 and the bypass slow start module 400.
Specifically, when the mains supply is abnormal, for example, when the mains supply is powered off, the control module 500 controls the bypass slow start module 400 to be closed, the bypass supply is started, and the bypass input charges the bus capacitor Cr through the bypass slow start module 400; meanwhile, the control module 500 also obtains the bus voltage of the bus capacitor Cr, and controls the bypass module 300 to be switched on when the bus voltage reaches a first preset voltage, so that the bypass slowly starts the commercial power all the way, and prevents the device of the commercial power all the way from being damaged by reverse current during bypass power supply, particularly the field-effect tube and the plastic package busbar in the inverter unit included in the rectification inverter module 100. The voltage difference between the first preset voltage and the voltage at the output end of the rectification inverter module 100 is not greater than the maximum voltage difference that can be received by the rectification inverter module 100.
When mains supply is normal, the control module 500 controls the mains supply to slowly start the module 200 to be closed, the mains supply charges for the bus capacitor Cr through the mains supply slowly starting the module 200, meanwhile, the control module 500 also acquires the bus voltage of the bus capacitor Cr, and controls the switching-on of the mains supply rectification inversion module 100 when the bus voltage reaches the second preset voltage, so that the mains supply slowly starts the bypass all the way, and when the mains supply is prevented, the reverse filling current damages the bypass module 300. The voltage difference between the second preset voltage and the voltage at the output end of the rectification inverter module 100 is not greater than the maximum voltage difference that can be received by the bypass module 300.
The slow-start bus circuit has the advantages that the circuit structure is simple, the number of contactors is reduced, and the cost is low; when the mains supply is abnormal, the bypass slow start module 400 is controlled to be closed, the bypass input charges the bus capacitor Cr through the bypass slow start module 400, and the bypass module 300 is controlled to be conducted when the bus voltage reaches a first preset voltage, so that the damage of the bus capacitor Cr and devices of the rectification inverter module 100 is avoided; when the mains supply is normal, the mains supply slow start module 200 is controlled to be closed, the mains supply charges the bus capacitor Cr through the mains supply slow start module 200, and the rectification inversion module 100 is controlled to be switched on when the bus voltage reaches the second preset voltage, so that the bypass module 300 is effectively prevented from being damaged, and the reliability of the uninterruptible power supply is improved.
Optionally, the rectification and inversion module 100 may further include a rectification unit and an inversion unit; the rectifying unit may be a mains rectifying unit. The input end of the rectification unit is connected with the input end of the rectification inversion module 100, and the output end of the rectification unit is connected with the bus capacitor Cr in parallel; the input end of the inversion unit is connected in parallel with the bus capacitor Cr, and the output end is connected with the output end of the rectification inversion module 100.
Optionally, the first preset voltage of this embodiment may be:
U1≥U0·1.732·80％
wherein, U1The first preset voltage is the voltage of the mains supply, and U0 is the voltage of the mains supply.
Illustratively, when the utility power is cut off, the control module 500 controls the bypass slow start module 400 to close, the bypass power supply is started, the bypass input charges the bus capacitor Cr through the bypass slow start module 400, and when the bus voltage reaches U0And 1.732 and 80 percent of the voltage difference between the two ends of the inverter unit is within a certain voltage difference by controlling the bypass module 300 to be conducted, so that the phenomenon that one path of the commercial power is damaged by large reverse current formed when the bypass power supply is started can be effectively avoided. In this embodiment, the voltage values of the first preset voltage and the second preset voltage are not specifically limited, and may also be 80% of the mains voltage (173V-276V), and the like, as long as the voltage difference between the first preset voltage and the voltage at the output end of the rectification inverter module 100 is not greater than the maximum voltage difference that can be received by the inverter unit, and the voltage difference between the second preset voltage and the voltage at the output end of the rectification inverter module 100 is not greater than the maximum voltage difference that can be received by the bypass module 300.
Optionally, after controlling the bypass module 300 to conduct when the bus voltage reaches the first preset voltage, the control module 500 may further be configured to: and controlling the bypass slow start module 400 to be disconnected, and reducing the energy loss of the bypass slow start module 400.
Or, after controlling the rectification inverter module 100 to be turned on when the bus voltage reaches the second preset voltage, the control module 500 may further be configured to: and the commercial power slow start module 200 is controlled to be disconnected, so that the energy loss of the commercial power slow start module 200 is reduced.
The control module 500 of the present embodiment is further configured to: when the power supply of the commercial power is abnormal, the power supply is converted into bypass power supply, the bypass module 300 can be controlled to be conducted, the bypass slow start module 400 is not needed, and at the moment, the reverse filling impact cannot be caused because the bus capacitor Cr is electrified at the moment of the abnormal commercial power; or the power supply is converted into the mains supply power supply when the bypass power supply is abnormal, the rectification inverter module 100 can be controlled to be conducted, the mains supply slow start module 200 is not needed, and the reverse irrigation impact cannot be caused at the moment, because the bus capacitor Cr is electrified when the bypass is abnormal.
In an embodiment of the present invention, referring to fig. 2, the commercial power slow-start module 200 of this embodiment may include: a first switching element K1, a first current limiting unit, and a first rectifying unit; a first terminal of the first switching element K1 is adapted to be connected to the mains, and a second terminal of the first switching element K1 is connected to a first terminal of the first current limiting unit; the second end of the first current limiting unit is connected with the input end of the first rectifying unit; the output end of the first rectifying unit is connected with the bus capacitor Cr in parallel. Alternatively, the first current limiting unit may be a resistor R1.
The bypass slow start module 400 of this embodiment may include: a second switching element K2, a second current limiting unit, and a second rectifying unit; a first terminal of the second switching element K2 is adapted to be connected with the bypass input, and a second terminal of the second switching element K2 is connected with a first terminal of the second current limiting unit; the second end of the second current limiting unit is connected with the input end of the second rectifying unit; the output end of the second rectifying unit is connected with the bus capacitor Cr in parallel. Alternatively, the first current limiting unit may be a resistor R2.
Optionally, the first switch element K1 and the second switch element K2 of the present embodiment may be both 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.
Optionally, the resistances of the first current limiting unit and the second current limiting unit may be variable, that is, the control module 500 may control the resistance of the first current limiting unit or the second current limiting unit to be variable according to a difference between the output terminal voltage of the rectification inverter module 100 and the bus voltage, so as to control the bus voltage in time and prevent the device from being damaged by the rapidly generated reverse current. The specific structure of the control module 500 is not limited in this embodiment, and may be a control chip or the like.
In an embodiment of the present invention, referring to fig. 2, the slow start bus circuit of this embodiment may further include: a first capacitor C1 and a first inductor L1; the first end of the first inductor L1 is suitable for being connected with the mains supply, and the second end of the first inductor L1 is connected with the first end of the first capacitor C1, the input end of the rectification inverter module 100 and the input end of the mains supply slow start module 200; a second terminal of the first capacitor C1 is connected to the neutral line N. The first capacitor C1 and the first inductor L1 form an input filtering unit, and the filtered commercial power is input to the commercial power slow start module 200 or the rectification inversion module 100.
The slow start bus circuit of this embodiment may further include: a second capacitor C2 and a second inductor L2; a first end of the second inductor L2 is connected to the output end of the rectification and inversion module 100, a second end of the second inductor L2 is adapted to be connected to an external load, and a second end of the second inductor L2 is further connected to a first end of the second capacitor C2; a second terminal of the second capacitor C2 is connected to the neutral line N. The second capacitor C2 and the second inductor L2 form an output filtering unit, and the voltage output by the rectification and inversion module 100 is filtered and then input to a load, so that the stability of power supply is ensured.
In this embodiment, the first capacitor C1 and the first inductor L1 form an LC filter circuit, or the second capacitor C2 and the second inductor L2 form an LC filter circuit, wherein the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are connected to the zero line N. In practical applications, the middle point of the bus is generally connected to the neutral line N, the second end of the first capacitor C1 and the second end of the second capacitor C2 may also be connected thereto, and the second end of the first capacitor C1 and the second end of the second capacitor C2 may also be connected to the neutral line N at the input end of the circuit or the neutral line N at the output end of the circuit.
Optionally, the bypass module 300 of the present embodiment may include a silicon controlled rectifier. The first terminal of the silicon controlled rectifier is adapted to be connected to the bypass input and the second terminal of the silicon controlled rectifier is adapted to be connected to an external load. The silicon controlled rectifier is a power supply power control electric appliance based on a thyristor and taking an intelligent digital control circuit as a core, has the advantages of high efficiency, no mechanical noise and abrasion, high response speed, small volume, light weight and the like, simplifies the circuit structure of the embodiment and reduces the cost of the embodiment.
Alternatively, as shown in FIG. 2, the input of the bypass module 300 may be connected to the bypass input through a bypass air switch; the first end of the first inductor L1 may be connected to the mains via an input air switch; the second terminal of the second inductor L2 may be connected to an external load through an output air switch.
Alternatively, an input contactor may be connected in series between the input air switch and the first inductor L1.
The working process of the slow-start bus circuit is described in detail according to the embodiment of the invention as follows:
in practical application, when direct bypass starts, then bypass current reachs the output after bypass module 300, because inverter unit's field effect transistor has anti-parallel diode, bus voltage (the voltage at bus capacitance Cr both ends) is zero this moment, consequently can appear pouring the circumstances of bus capacitance Cr backward, the electric current can reach kilo ampere or even higher in the twinkling of an eye out of control this moment, cause components and parts such as field effect transistor and plastic envelope female arranging to damage, and the same reason, direct commercial power starts, the commercial power reachs the output through rectification inverter module 100, the circumstances of pouring bypass module 300 backward can appear, cause bypass module 300 to damage. Similarly, when at least two uninterruptible power supplies are connected in parallel, the outputs of each machine are connected together (for example, the outputs are directly connected with the same load), if each machine works in a bypass state and the bypass switch is opened successively, the machine which is opened first outputs, and the bypass starting switch of the other machine is not opened yet, because the bus capacitor Cr has no voltage, the current of the machine which is opened first can be reversely poured into the machine which is opened later, and the machine which is opened later is damaged. Therefore, the utility power slow start module 200 and the bypass slow start module 400 are added in the embodiment, and the utility power is started slowly in one way or in a bypass, so that the stability of the uninterruptible power supply is ensured.
Illustratively, the first switching element K1, the first current limiting unit R1 and the first rectifying unit form the utility power slow start module 200, so that the use of an output contactor is reduced, the cost is saved, and the utility power slow start module 200 is controlled by the control module 500. In this embodiment, the utility power is preferentially started slowly, the utility power cannot be started slowly by the bypass, for example, the utility power and the bypass are both supplied normally, and the utility power is preferentially started slowly by the module 200.
When the mains supply is abnormal, the bypass is started slowly; the control module 500 controls the second switch element K2 to be closed, the bypass input charges the bus capacitor Cr through the bypass slow start module 400, and when the bus voltage reaches U01.732-80%, the bypass module 300 is controlled to be turned on, and the second switching element K2 is controlled to be turned off; similarly, when the mains supply is normal, the mains supply is started slowly, the control module 500 controls the first switch element K1 to be closed, the mains supply charges the bus capacitor Cr through the mains supply slow start module 200, the rectification inverter module 100 is controlled to be switched on when the bus voltage reaches the second preset voltage, and the first switch element K1 is controlled to be switched off to prevent the reverse current from damaging the bypass device.
For the parallel operation condition (when at least two uninterruptible power supplies are parallel operated), for example, when the utility power supply of each uninterruptible power supply is abnormal, the control module 500 controls the bypass slow start module 400 corresponding to each uninterruptible power supply to be closed, so that the bypass input of each uninterruptible power supply charges the corresponding bus capacitor Cr through the corresponding bypass slow start module 400, and controls the corresponding bypass module 300 to be turned on when the bus voltage reaches the first preset voltage.
Or, when the mains supply of each ups is normal, the control module 500 controls the closing of the mains supply slow start module 200 corresponding to each ups, so that the mains supply of each ups charges the corresponding bus capacitor Cr through the corresponding mains supply slow start module 200, and controls the corresponding rectification and inversion module 100 to be turned on when the bus voltage reaches the second preset voltage.
Or, when the mains supply of one ups is abnormal and the mains supply of another ups is normal, the bypass slow start module 400 of the ups with the abnormal mains supply is controlled to be closed, so that the bypass input charges the corresponding bus capacitor Cr through the bypass slow start module 400, the bypass module 300 is controlled to be switched on when the corresponding bus voltage reaches a first preset voltage, and the mains slow start module 200 corresponding to the ups with the normal mains supply is controlled to be closed, so that the mains supply charges the corresponding bus capacitor Cr through the mains slow start module 200, and the rectification inversion module 100 is controlled to be switched on when the corresponding bus voltage reaches a second preset voltage.
In the above embodiment, the power supply system comprises the rectification inverter module 100, the commercial power slow start module 200, the bypass module 300, the bypass slow start module 400 and the control module 500, and has the advantages of simple circuit structure, reduced number of contactors, low cost and low power consumption; when the mains supply is abnormal, the bypass slow start module 400 is controlled to be closed, the bypass input charges the bus capacitor Cr through the bypass slow start module 400, and the bypass module 300 is controlled to be conducted when the bus voltage reaches a first preset voltage, so that the bus capacitor Cr and devices of the inversion unit are prevented from being damaged; when the mains supply is normal, the mains supply slow start module 200 is controlled to be closed, the mains supply charges the bus capacitor Cr through the mains supply slow start module 200, and the rectification inversion module 100 is controlled to be switched on when the bus voltage reaches the second preset voltage, so that the bypass module 300 is effectively prevented from being damaged, and the reliability of the uninterruptible power supply is improved.
Further, the embodiment provides an uninterruptible power supply, which includes any one of the slow start bus circuits provided in the above embodiments, and also has the beneficial effect of any one of the slow start bus circuits.
Further, corresponding to the uninterruptible power supply in the above embodiment, the embodiment provides a method for restarting the bus bar slowly, which is suitable for a single uninterruptible power supply, and is detailed as follows:
when the mains supply is abnormal, the bypass slow start module 400 is controlled to be closed, so that the bypass input charges the bus capacitor Cr through the bypass slow start module 400; acquiring the bus voltage of the bus capacitor Cr, and controlling the bypass module 300 to be conducted when the bus voltage reaches a first preset voltage;
or when the mains supply is normal, controlling the mains supply slow start module 200 to be closed, and charging the bus capacitor Cr by the mains supply through the mains supply slow start module 200; and acquiring the bus voltage of the bus capacitor Cr, and controlling the rectification inverter module 100 to be switched on when the bus voltage reaches a second preset voltage.
In an embodiment of the present invention, after controlling the bypass module 300 to conduct when the bus voltage reaches the first preset voltage, the method further includes: controlling the bypass slow start module 400 to be disconnected;
or, after the rectifying and inverting module 100 is controlled to be turned on when the bus voltage reaches the second preset voltage, the method further includes: and controlling the commercial power slow start module 200 to be disconnected.
In an embodiment of the present invention, the first preset voltage is:
U1≥U0·1.732·80％
wherein, U1For the first predetermined voltage, U0Is the voltage of the mains supply.
Further, corresponding to the uninterruptible power supply in the above embodiment, the embodiment provides a method for restarting the bus bar slowly, which is applicable to at least two uninterruptible power supplies, and is detailed as follows:
when the mains supply of each uninterruptible power supply is abnormal, controlling the bypass slow start module 400 corresponding to each uninterruptible power supply to be closed so that the bypass input of each uninterruptible power supply charges the corresponding bus capacitor Cr through the corresponding bypass slow start module 400; and acquiring the bus voltage of each bus capacitor Cr, and controlling the corresponding bypass module 300 to be conducted when the bus voltage reaches a first preset voltage.
Or when the mains supply of each uninterruptible power supply is normal, controlling the closing of the corresponding mains supply slow-start module 200 of each uninterruptible power supply so as to charge the corresponding bus capacitor Cr by the mains supply of each uninterruptible power supply through the corresponding mains supply slow-start module 200; and acquiring the bus voltage of each bus capacitor Cr, and controlling the corresponding rectification inverter module 100 to be switched on when the bus voltage reaches a second preset voltage.
Or, when the mains supply of one ups is abnormal and the mains supply of another ups is normal, the bypass slow start module 400 of the ups with the abnormal mains supply is controlled to be closed, so that the bypass input charges the corresponding bus capacitor Cr through the bypass slow start module 400, the bypass module 300 is controlled to be switched on when the corresponding bus voltage reaches a first preset voltage, and the mains slow start module 200 corresponding to the ups with the normal mains supply is controlled to be closed, so that the mains supply charges the corresponding bus capacitor Cr through the mains slow start module 200, and the rectification inversion module 100 is controlled to be switched on when the corresponding bus voltage reaches a second preset voltage.
In the bus slow-start method, when the mains supply is abnormal, the bypass slow-start module 400 is controlled to be closed, the bypass input charges the bus capacitor Cr through the bypass slow-start module 400, and the bypass module 300 is controlled to be conducted when the bus voltage reaches a first preset voltage, so that the bus capacitor Cr and devices of the inverter unit are prevented from being damaged; when the mains supply is normal, the mains supply slow start module 200 is controlled to be closed, the mains supply charges the bus capacitor Cr through the mains supply slow start module 200, and the rectification inversion module 100 is controlled to be switched on when the bus voltage reaches the second preset voltage, so that the bypass module 300 is effectively prevented from being damaged, and the reliability of the uninterruptible power supply is improved.
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.
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. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and 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 slow-start bus circuit, comprising: the system comprises a rectification inversion module, a commercial power slow start module, a bypass slow start module and a control module; the rectification inversion module comprises a bus capacitor;
the input end of the rectification inversion module is suitable for being connected with a mains supply, and the output end of the rectification inversion module is suitable for being connected with an external load; the input end of the commercial power slow start module is suitable for being connected with commercial power, and the output end of the commercial power slow start module is connected with the bus capacitor in parallel; the input end of the bypass slow start module is suitable for being connected with the bypass input, and the output end of the bypass slow start module is connected with the bus capacitor in parallel; the input end of the bypass module is suitable for being connected with a bypass input, and the output end of the bypass module is suitable for being connected with the external load; the control module is connected with the rectification inversion module, the commercial power slow start module, the bypass module and the bypass slow start module;
when the mains supply is abnormal, the control module is used for controlling the bypass slow start module to be closed, and the bypass input charges the bus capacitor through the bypass slow start module; the control module is further used for obtaining the bus voltage of the bus capacitor and controlling the bypass module to be conducted when the bus voltage reaches a first preset voltage;
when mains supply is normal, control module is used for controlling the commercial power is opened the module closure slowly, and the commercial power passes through the commercial power is opened the module slowly and is done bus capacitor charges, control module still is used for acquireing bus capacitor's busbar voltage controls when busbar voltage reaches second preset voltage rectifier and inverter module switches on.
2. The slow start bus circuit of claim 1, wherein the first predetermined voltage is:
U1≥U0·1.732·80％
wherein, U1For the first predetermined voltage, U0Is the voltage of the mains supply.
3. The slow start bus circuit of claim 1, wherein after the bus voltage reaches a first preset voltage and the bypass module is controlled to conduct, the control module is further configured to: controlling the bypass slow start module to be disconnected;
or, after the rectification inverter module is controlled to be switched on when the bus voltage reaches a second preset voltage, the control module is further configured to: and controlling the commercial power slow start module to be disconnected.
4. The slow start bus circuit of claim 1, wherein the utility slow start module comprises: a first switching element, a first current limiting unit and a first rectifying unit;
the first end of the first switching element is suitable for being connected with a mains supply, and the second end of the first switching element is connected with the first end of the first current limiting unit; the second end of the first current limiting unit is connected with the input end of the first rectifying unit; the output end of the first rectifying unit is connected with the bus capacitor in parallel.
5. The slow start bus circuit of claim 1, wherein the bypass slow start module comprises: a second switching element, a second current limiting unit and a second rectifying unit;
a first end of the second switching element is suitable for being connected with a bypass input, and a second end of the second switching element is connected with a first end of the second current limiting unit; the second end of the second current limiting unit is connected with the input end of the second rectifying unit; and the output end of the second rectifying unit is connected with the bus capacitor in parallel.
6. The slow start bus circuit of any one of claims 1 to 5, further comprising: a first capacitor and a first inductor;
the first end of the first inductor is suitable for being connected with a mains supply, and the second end of the first inductor is connected with the first end of the first capacitor, the input end of the rectification inverter module and the input end of the mains supply slow start module; and the second end of the first capacitor is connected with a zero line.
7. The slow start bus circuit of any one of claims 1 to 5, further comprising: a second capacitor and a second inductor;
the first end of the second inductor is connected with the output end of the rectification inversion module, the second end of the second inductor is suitable for being connected with the external load, and the second end of the second inductor is also connected with the first end of the second capacitor; and the second end of the second capacitor is connected with a zero line.
8. An uninterruptible power supply comprising the slow start bus circuit according to any one of claims 1 to 7.
9. A bus slow-starting method is suitable for a single uninterrupted power supply and is characterized by comprising the following steps:
when the mains supply is abnormal, the bypass slow start module is controlled to be closed, so that the bypass input charges the bus capacitor through the bypass slow start module; acquiring the bus voltage of the bus capacitor, and controlling the bypass module to be conducted when the bus voltage reaches a first preset voltage;
or when the mains supply is normal, the mains supply slow start module is controlled to be closed, and the mains supply charges the bus capacitor through the mains supply slow start module; and acquiring the bus voltage of the bus capacitor, and controlling the rectification inversion module to be conducted when the bus voltage reaches a second preset voltage.
10. A bus slow-starting method is suitable for at least two uninterrupted power supplies and is characterized by comprising the following steps:
when the mains supply of each uninterruptible power supply is abnormal, controlling a bypass slow start module corresponding to each uninterruptible power supply to be closed so that the bypass input of each uninterruptible power supply charges a corresponding bus capacitor through the corresponding bypass slow start module; acquiring the bus voltage of each bus capacitor, and controlling the corresponding bypass module to be conducted when the bus voltage reaches a first preset voltage;
or when the mains supply of each uninterruptible power supply is normal, controlling the closing of the corresponding mains supply slow-start module of each uninterruptible power supply so as to charge the corresponding bus capacitor by the mains supply of each uninterruptible power supply through the corresponding mains supply slow-start module; acquiring the bus voltage of each bus capacitor, and controlling the corresponding rectification inverter module to be conducted when the bus voltage reaches a second preset voltage;
or, when the mains supply of one uninterruptible power supply is abnormal and the mains supply of the other uninterruptible power supply is normal, the bypass slow-start module of the uninterruptible power supply with the abnormal mains supply is controlled to be closed, so that bypass input charges for the corresponding bus capacitor through the bypass slow-start module, the bypass module is controlled to be conducted when the corresponding bus voltage reaches a first preset voltage, and meanwhile, the mains supply slow-start module corresponding to the uninterruptible power supply with the normal mains supply is controlled to be closed, so that the mains supply charges for the corresponding bus capacitor through the mains supply slow-start module, and the rectification inversion module is controlled to be conducted when the corresponding bus voltage reaches a second preset voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911012984.4A CN110829575B (en) | 2019-10-23 | 2019-10-23 | Slow-start bus circuit, method and uninterruptible power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911012984.4A CN110829575B (en) | 2019-10-23 | 2019-10-23 | Slow-start bus circuit, method and uninterruptible power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110829575A true CN110829575A (en) | 2020-02-21 |
| CN110829575B CN110829575B (en) | 2021-06-22 |
Family
ID=69550283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911012984.4A Active CN110829575B (en) | 2019-10-23 | 2019-10-23 | Slow-start bus circuit, method and uninterruptible power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110829575B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018872A (en) * | 2020-08-20 | 2020-12-01 | 科华恒盛股份有限公司 | UPS control method and UPS |
| CN113452133A (en) * | 2021-06-18 | 2021-09-28 | 科华数据股份有限公司 | Relay control method, terminal, UPS and computer readable storage medium |
| CN113452137A (en) * | 2021-06-30 | 2021-09-28 | 科华数据股份有限公司 | Power supply control method and power supply system |
| CN113691154A (en) * | 2021-07-08 | 2021-11-23 | 科华数据股份有限公司 | Inverter control device, inverter equipment and control method |
| CN113691153A (en) * | 2021-07-08 | 2021-11-23 | 科华数据股份有限公司 | Inverter control device, inverter equipment and control method |
| CN113765084A (en) * | 2021-09-10 | 2021-12-07 | 华为技术有限公司 | Power supply equipment, power supply system and server cabinet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931248A (en) * | 2009-06-24 | 2010-12-29 | 力博特公司 | Self-feedback ageing soft start method and system for UPS power supply |
| CN102355125A (en) * | 2011-09-09 | 2012-02-15 | 北京索英电气技术有限公司 | Soft start circuit of converter |
| CN108199575A (en) * | 2018-02-11 | 2018-06-22 | 天津瑞能电气有限公司 | A kind of high-power converter soft starting circuit |
| KR20180099451A (en) * | 2017-12-26 | 2018-09-05 | 주식회사 에스앤지파워 | Module-type ups system having hot swap function of switch by using on-off control of inverter output |
| CN110071572A (en) * | 2019-04-25 | 2019-07-30 | 合肥堃能电气科技有限公司 | A kind of Bidirectional charging-discharging one emergency power supply unit and its control method |
-
2019
- 2019-10-23 CN CN201911012984.4A patent/CN110829575B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931248A (en) * | 2009-06-24 | 2010-12-29 | 力博特公司 | Self-feedback ageing soft start method and system for UPS power supply |
| CN102355125A (en) * | 2011-09-09 | 2012-02-15 | 北京索英电气技术有限公司 | Soft start circuit of converter |
| KR20180099451A (en) * | 2017-12-26 | 2018-09-05 | 주식회사 에스앤지파워 | Module-type ups system having hot swap function of switch by using on-off control of inverter output |
| CN108199575A (en) * | 2018-02-11 | 2018-06-22 | 天津瑞能电气有限公司 | A kind of high-power converter soft starting circuit |
| CN110071572A (en) * | 2019-04-25 | 2019-07-30 | 合肥堃能电气科技有限公司 | A kind of Bidirectional charging-discharging one emergency power supply unit and its control method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018872A (en) * | 2020-08-20 | 2020-12-01 | 科华恒盛股份有限公司 | UPS control method and UPS |
| CN112018872B (en) * | 2020-08-20 | 2022-05-06 | 科华恒盛股份有限公司 | UPS control method and UPS |
| CN113452133A (en) * | 2021-06-18 | 2021-09-28 | 科华数据股份有限公司 | Relay control method, terminal, UPS and computer readable storage medium |
| CN113452137A (en) * | 2021-06-30 | 2021-09-28 | 科华数据股份有限公司 | Power supply control method and power supply system |
| CN113691154A (en) * | 2021-07-08 | 2021-11-23 | 科华数据股份有限公司 | Inverter control device, inverter equipment and control method |
| CN113691153A (en) * | 2021-07-08 | 2021-11-23 | 科华数据股份有限公司 | Inverter control device, inverter equipment and control method |
| CN113765084A (en) * | 2021-09-10 | 2021-12-07 | 华为技术有限公司 | Power supply equipment, power supply system and server cabinet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110829575B (en) | 2021-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110829575B (en) | Slow-start bus circuit, method and uninterruptible power supply | |
| US9042146B2 (en) | DC pre-charge circuit | |
| CN102545678B (en) | Inverter and startup method thereof | |
| CN104935077B (en) | For the Anti-electricity dazzling device and its control method of series capacitance type A.C. contactor | |
| TWI607619B (en) | Power supply device and control method thereof | |
| CN103269166A (en) | Frequency converter with pre-charging protection function | |
| CN104170236A (en) | A converter cell and associated converter arm and method | |
| WO2023078432A1 (en) | Power supply apparatus and power supply control method | |
| CN110299860B (en) | Initial charging system for medium voltage inverter and method for controlling the same | |
| CN102223081B (en) | Method for charging high-capacity voltage type frequency converter | |
| CN207504774U (en) | Variable frequency drive and system | |
| US20220360094A1 (en) | Power supply system | |
| CN203671834U (en) | Soft start charging circuit | |
| CN212660103U (en) | Isolation circuit and switching power supply | |
| CN112383217B (en) | Direct-current bus charging circuit and control method thereof | |
| CN205092766U (en) | Charging system in advance suitable for super large power high voltage transformers | |
| CN212708991U (en) | Vehicle-mounted charger with pre-charging and discharging functions | |
| CN112260375A (en) | Circuit device, method and frequency conversion system | |
| CN201937480U (en) | Single-phase full-control rectifying and current-limiting device | |
| CN205693373U (en) | A kind of load switching transitional module | |
| CN212518414U (en) | APF/SVG soft start protection circuit | |
| CN108199572A (en) | A kind of frequency converter and its circuit breaking protective system | |
| CN109921676A (en) | Converter topology unit and converter device | |
| CN201336644Y (en) | Connection line for high torque fully intelligent soft starter and motor | |
| CN215378544U (en) | Charging circuit and charging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 361101 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Patentee after: Kehua Data Co.,Ltd. Patentee after: ZHANGZHOU KEHUA TECHNOLOGY LIMITED BY SHARE Ltd. Address before: 361101 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Patentee before: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY LIMITED BY SHARE Ltd. |