CN115954902B - Device and method for eliminating three-phase load unbalance of semiconductor test equipment - Google Patents
Device and method for eliminating three-phase load unbalance of semiconductor test equipment Download PDFInfo
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Abstract
The invention discloses a device and a method for eliminating three-phase load unbalance of semiconductor test equipment, wherein the device comprises: the system comprises a first current monitoring component, a current regulating component and a compensation component which is connected with a load in parallel on a plurality of live wires and at least one zero wire; the compensation component is connected with the live wire in one-to-one correspondence through the access wire, the outgoing wire is connected with the zero wire, and electromagnetic induction is realized through the induction wire and the live wire, so that current of the corresponding access wire and current of the induction wire are regulated; a first current monitoring assembly is arranged on each access line and fire wire for monitoring the current of each access line and fire wire; the current regulating and controlling assembly is in signal connection with the compensating assembly and the first current monitoring assembly, and controls the compensating assembly to regulate the current of each access line according to the current of each live wire monitored by the first current monitoring assembly, and generates trigger current to regulate the current of each induction line. The invention can control and regulate the current of the three phase lines, thereby leading the current of the three phase lines to reach balance.
Description
Technical Field
The invention relates to the technical field of three-phase voltage stabilization, in particular to a device and a method for eliminating three-phase load unbalance of semiconductor test equipment.
Background
The chip testing equipment is often required to be provided with a 380V three-phase four-wire power supply, but in actual work, according to different technologies for testing the electrical performance of the chip, the three-phase power operation load is unbalanced in most of the time, so that the zero line of the three-phase four-wire power supply is electrified. When the three-phase power is unbalanced, the current of the neutral line may exceed the phase line current of the three-phase power. However, the diameters of the zero line and the ground line in the actual three-phase four-wire or three-phase five-wire standard cable are smaller than those of the phase line by 1-2 numbers, so that when the three-phase power consumption is unbalanced, the current of the zero line is easily caused to be overlarge, the transformer of the total power distribution room is caused to be unstable, and even the zero line is caused to generate heat to scald to cause electric fire.
The existing mode for solving the three-phase electric unbalance is as follows: the zero line current eliminator is added, but the zero line current eliminator is connected with the load in series, the zero sequence harmonic current flows through the zero sequence filter, the CPU of the zero line current eliminator calculates the magnitude and the direction of magnetic flux generated by the harmonic current in the zero line current eliminator, and the magnetic flux with equal magnitude and opposite direction are generated relatively to counteract and filter the harmonic wave, so that the effect of filtering the zero line current is achieved.
CN107834577a discloses a zero line current eliminator, which comprises a special magnetic circuit three-phase transformer, a sampling unit, a controller and an action unit; the controller is respectively and electrically connected with the sampling unit and the action unit; the action unit is electrically connected with the special magnetic circuit three-phase transformer; the special magnetic circuit three-phase transformer is connected with a load. The zero line current eliminator only independently decomposes the current of the zero line, and the current imbalance problem of the three phase line is not solved.
CN115603339a discloses a three-phase power distribution system, an adjusting method thereof and an electric appliance, wherein the three-phase power distribution system comprises a control unit connected with a three-phase power supply, an execution unit for switching the connection state of a single-phase load and the three-phase power supply, and an energy storage unit connected with the three-phase power supply and capable of charging and discharging each phase of the three-phase power supply, and when the three-phase power distribution system is started, the current of each phase of the three-phase power supply is adjusted through the execution unit and the energy storage unit, so that the current of each phase of the three-phase power supply is equal. Although the current of each phase can be regulated, the specific regulation mode is not clear, the energy storage unit is directly charged by three-phase electricity, the charging process is not controlled, overload damage to the energy storage unit is easy to cause, and the charging and discharging processes of the energy storage unit are also easy to interfere with each other.
Therefore, how to provide a device capable of precisely eliminating the current imbalance of the three-phase line is a technical problem to be solved in the art.
Disclosure of Invention
The invention provides a device and a method for eliminating three-phase load unbalance of semiconductor test equipment, which can control and regulate three-phase line current, so that the three-phase line current is balanced, and the charge and discharge safety of a compensation component is improved.
In a first aspect, the present invention provides an apparatus for eliminating three-phase load imbalance of a semiconductor test device, comprising: the system comprises a first current monitoring component, a current regulating component and a compensation component which is connected with a load in parallel on a plurality of live wires and at least one zero wire;
the compensation component is connected with all the live wires in one-to-one correspondence through a plurality of access wires, the outgoing wires are connected with the zero wires, and electromagnetic induction is realized through one-to-one correspondence between the induction wires and all the live wires, so that the current of the access wires and the current of the induction wires are regulated;
the first current monitoring assembly is arranged on an access wire and a fire wire at the rear end of each node and is used for monitoring the current of each access wire and each fire wire, wherein the node is the intersection point of each fire wire and the access wire;
the current regulating and controlling assembly is in signal connection with the compensating assembly and the first current monitoring assembly, and controls the compensating assembly to regulate the current of each access line according to the current of each live wire monitored by the first current monitoring assembly, and generates trigger current to regulate the current of each induction line.
Further, the compensation component comprises an automatic distribution cabinet and a charging and discharging component connected with the automatic distribution cabinet, the automatic distribution cabinet is correspondingly connected to the live wire through an access wire, the charging and discharging component is connected to the zero wire through an outgoing wire, the induction wire is connected with the charging and discharging component, and the charging and discharging component is used for storing input electric energy and releasing electric energy to the live wire.
Further, the charging and discharging assembly comprises at least two groups of battery packs, all the battery packs are connected with the automatic distribution cabinet and the zero line after being connected in parallel, and all the battery packs are connected with the automatic distribution cabinet through the multi-power automatic change-over switch.
Further, the automatic distribution cabinet comprises a power distribution assembly and a plurality of distribution switch groups connected with the power distribution assembly in a signal manner, wherein each distribution switch group is formed by connecting a plurality of distribution switches in parallel, and two ends of each distribution switch group are respectively connected with the charge and discharge assembly and an access line;
according to the current of each live wire monitored by the first current monitoring component, the control compensation component adjusts the current of different access lines, and the method comprises the following steps:
the current regulating and controlling component obtains the current to be regulated of different access lines according to the current of each live wire monitored by the first current monitoring component;
the power distribution assembly gradually increases the closing quantity of distribution switches corresponding to all access lines according to the currents to be regulated of different access lines;
and stopping closing the distribution switch of the access line when the actual current of the access line is equal to the current to be regulated of the access line.
Further, the automatic distribution cabinet comprises a digital-analog converter in signal connection with the current regulation and control assembly and a charging circuit connected with the digital-analog converter, wherein the digital-analog converter is used for generating trigger currents with different magnitudes, and the charging circuit is used for regulating the charging current according to the trigger currents.
Further, the charging circuit comprises a PNP triode, a bridge rectifier, a transformer and a capacitor, wherein the bridge rectifier, the PNP triode and the charging and discharging assembly are sequentially and circularly connected to form a circulation loop, two coils of the transformer are respectively formed by a live wire and an induction wire, two ends of the induction wire are respectively connected to two half-bridges of the bridge rectifier, the capacitor is connected with the bridge rectifier in parallel, and the digital-analog converter is connected with an emitter of the PNP triode;
according to the current of each live wire monitored by the first current monitoring component, the control compensation component adjusts the current of each charging circuit, and the control compensation component comprises the following components:
the current regulation and control component obtains the current to be output of each live wire according to the current of each live wire monitored by the first current monitoring component;
taking the current to be output of each live wire as the current to be input of different transformers to obtain the current to be generated by different induction wires;
obtaining the current to be input by the emitter of the PNP triode according to the currents to be generated by different induction lines;
generating a corresponding digital signal according to the current to be input by the emitter of the PNP triode and sending the digital signal to the digital-analog converter;
the digital-analog converter generates trigger current to the emitter of the corresponding PNP triode according to the received digital signal;
the charging circuit changes the charging current of the charging and discharging assembly through the trigger current.
Further, the automatic distribution cabinet comprises an inverter connected with the charging and discharging assembly, the inverter is connected with the live wire through an access wire, and the charging and discharging assembly comprises a discharging management assembly in communication connection with the current regulation and control assembly;
the current regulation and control subassembly is according to the electric current of every live wire of first electric current monitoring component monitoring, and the electric current of every access line is adjusted to control compensation subassembly, includes:
the current regulation and control component generates a current acquisition signal and sends the current acquisition signal to the digital-analog converter;
based on the current acquisition signal, the digital-to-analog converter forms a current trigger signal according to the generated trigger current, and feeds the current trigger signal back to the current regulation and control component;
the current regulating and controlling component judges whether to generate access line current according to the current trigger signal;
when the current of the access line is generated, the current regulating and controlling component obtains the current to be generated of different access lines according to the current of each live wire monitored by the first current monitoring component;
generating control signals according to currents to be generated by different access lines and sending the control signals to a discharge management assembly;
the discharging management component adjusts the current output to the access line by the charging and discharging component according to the control signal.
Further, the device also comprises a second monitoring component which is arranged between the automatic distribution cabinet and the charging and discharging component, and the second monitoring component is in signal connection with the current regulation and control component and is used for monitoring the current passing through the automatic distribution cabinet.
Further, the first current monitoring component and the second current monitoring component are both current transformers.
Further, according to the current of each live wire monitored by the first current monitoring component, the control compensation component adjusts the current of different access wires, and the method comprises the following steps:
collecting the current of each live wire monitored in the first current monitoring assembly to obtain a first current group;
analyzing and comparing the values of all currents in the first current group to obtain the difference value between all currents;
based on the difference value of each current in the first current group, obtaining a compensation value required by each current balance in the first current group, and establishing a corresponding relation between the compensation value and each access line;
collecting the current of each access line monitored in the first current monitoring assembly to obtain a second current group;
determining the current of each access line according to the compensation value and the second current group, and verifying and comparing the current with the current value of the second current monitoring component;
and controlling the automatic distribution cabinet to adjust the current of each access line.
In a second aspect, the present invention also provides a method for eliminating three-phase load imbalance of a semiconductor test apparatus, the method being implemented by an apparatus as described above, the method comprising the steps of:
the method comprises the steps that an access line of a compensation assembly is connected with all fire wires in a one-to-one correspondence manner, an outgoing line is connected with a zero line, induction lines are arranged in a one-to-one correspondence manner with all the fire wires, electromagnetic induction is formed, and a first current monitoring assembly is arranged on the access line and the fire wires;
the current regulating and controlling component controls the compensating component to regulate the current of different access lines according to the live wire current monitored in real time, and generates trigger current to regulate the current of each induction line.
The invention at least has the following beneficial effects:
(1) The current regulation and control assembly can automatically calculate and control the input current of the access line on line through the access line and live line current monitored by the first current monitoring assembly, so that the respective whole current of all the live lines reaches balance, and the problem of unbalanced three-phase power consumption is fundamentally solved. Meanwhile, according to the calculation result, accurate storage of electric energy can be realized.
(2) The automatic distribution cabinet can convey unbalanced three-phase electric power to the charging and discharging assembly for storage, and provides electric energy when the automatic distribution cabinet regulates the current of different live wires.
(3) By providing at least two groups of battery packs, the battery packs can have two states simultaneously when in use, one is in a charging state, the other is in a power transmission state, and the battery packs in two different states are mutually switched to supply and output, so that the uninterrupted absorption of redundant electric energy for 24 hours is realized.
Drawings
FIG. 1 is a schematic diagram of an apparatus for eliminating three-phase load imbalance of a semiconductor test device according to the present invention;
fig. 2 is a circuit diagram of one circuit in the automatic distribution cabinet provided by the invention;
fig. 3 is a circuit diagram of a distribution switch connection cell in an automatic distribution cabinet provided by the invention;
fig. 4 is a circuit diagram of another circuit in the automatic distribution cabinet provided by the invention.
Reference numerals illustrate: 1-compensation component, 11-access line, 12-outgoing line, 13-automatic distribution cabinet, 14-charge-discharge component, 15-battery pack, 21-first current monitoring component, 22-second current monitoring component, 3-current regulation component, 41-live wire, 42-neutral wire, 51-distribution switch group, 61-digital-analog converter, 62-PNP triode, 63-bridge rectifier, 64-transformer, 65-capacitor.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
When three-phase load unbalance and three-phase parameter asymmetry occur, a three-phase unbalance phenomenon occurs. The state of three-phase balance is one of the main indicators of power quality. The imbalance of the three phases causes additional heating and vibration of the rotating motor, increased magnetic leakage and local overheating of the transformer, increased line loss of the power grid, misoperation of various protection and automatic devices, and the like. In particular, three-phase imbalance mainly produces the following hazards:
1. increasing the power loss of the line. In a three-phase four-wire power supply network, when current passes through the line conductors, electrical energy losses must be generated due to the presence of impedances, the losses being proportional to the square of the passing current.
2. The power loss of the distribution transformer is increased. Distribution transformers are the power supply main equipment of a low-voltage power grid, and when the distribution transformers operate under the unbalanced three-phase load working condition, the distribution transformer loss is increased. Because the power loss of the distribution transformer varies with the imbalance of the load.
3. The dispensing force is reduced. When the distribution transformer is designed, the winding structure is designed according to the load balance operation condition, the winding performance is basically consistent, and the rated capacity of each phase is equal. The maximum allowable output of the distribution transformer is limited by the rated capacity of each phase.
4. The distribution transformer generates zero sequence current. The distribution transformer operates under the unbalanced working condition of the three-phase load, and generates zero-sequence current which changes along with the unbalanced degree of the three-phase load, and the greater the unbalanced degree is, the greater the zero-sequence current is.
5. Affecting the safe operation of the electric equipment. The distribution transformer is designed according to the three-phase load balance operation working condition, and the resistance, leakage reactance and excitation impedance of each phase winding are basically consistent. When the distribution transformer operates in the three-phase load balance mode, three-phase currents are basically equal, voltage drop of each phase in the distribution transformer is basically the same, and three-phase voltages output by the distribution transformer are balanced.
6. The motor efficiency is reduced. The distribution transformer operates under the unbalanced working condition of the three-phase load, and the three-phase unbalance of the output voltage is caused. Because the unbalanced voltage has three voltage components of positive sequence, negative sequence and zero sequence, when the unbalanced voltage is input into the motor, the rotating magnetic field generated by the negative sequence voltage is opposite to the rotating magnetic field generated by the positive sequence voltage, and the braking effect is achieved.
In particular, the invention solves the problem of unbalanced three-phase power consumption of chip test equipment.
The chip test equipment needs to be provided with a 380V three-phase four-wire power supply, but in actual work, according to different processes, a three-phase power running load is unbalanced in most of the time, so that a zero line N of the three-phase four-wire power supply is electrified.
Assuming that three live wire currents are a, b, c, a=10a, b=8a, c=2a, respectively, the neutral wire N current is:
the above calculation of the current of the neutral line is the vector sum of the three phases of ABC, and when the three phases are unbalanced, the current of the neutral line may exceed the phase line current of the three phases. When the three-phase electricity is unbalanced, the current of the zero line is easily caused to be overlarge, the transformer of the total power distribution room is unstable, and even the zero line is heated to generate heat to cause electric fire.
Based on the above-mentioned problems, referring to fig. 1, the present invention provides an apparatus for eliminating three-phase load unbalance of a semiconductor test device, comprising: a first current monitoring assembly 21, a current regulation assembly 3, and a compensation assembly 1 connected in parallel with the load on a plurality of hot lines and at least one neutral line;
the compensation component 1 is connected with all the live wires 41 in a one-to-one correspondence manner through a plurality of access wires 11, is connected with the zero line 42 through the outgoing wires 12, and realizes electromagnetic induction in a one-to-one correspondence manner through the induction wires and all the live wires 41, and is used for regulating the current of the corresponding access wires 11 and the current of the induction wires according to the current of the live wires 41;
the first current monitoring component 21 is arranged on the access line 11 and the fire wire 41 at the rear end of each node and is used for monitoring the current of each access line 11 and each fire wire 41, wherein the node is the intersection point of each fire wire 41 and the access line 11;
the current regulating and controlling assembly 3 is in signal connection with the compensating assembly 1 and the first current monitoring assembly 21, and controls the compensating assembly 1 to regulate the current of each access wire 11 according to the current of each live wire 41 monitored by the first current monitoring assembly 21 so that the respective overall currents of all the live wires 41 are the same, and generates trigger current to regulate the current of each induction wire so as to finish the storage of redundant electric energy of all the live wires 41.
In the practical application scenario, the access lines 11 of the device are connected to all the live wires 41, each access line 11 is connected to one live wire 41, the outgoing line 12 is connected to the zero line 42, the first current monitoring component 21 is arranged on the live wire 41 to monitor the current of the live wire 41, when all the live wires 41 reach the current balance, the input current of each access line 11 is automatically calculated on line according to the monitored current of the live wire 41, and the current is calculated according to the current of the live wire 41Controlling the actual input current of the access line 11 according to the calculated input current result; the actual input current through the access line 11 is input to the corresponding live wire 41, so that the currents of all the live wires 41 reach balance (namely, the respective overall currents of all the live wires 41 are the same), and the problem of unbalanced three-phase power consumption is solved from the root. In this embodiment, when the current of the access line 11 is adjusted according to the current of the live line 41, in order to ensure that the current in the access line 11 can be matched with the current of the live line 41, the same current of all the live lines 41 is finally formed, and by monitoring the current of all the access lines 11, when the current of the access line 11 is adjusted according to the current of the live line 41, it can be ensured that all the adjusted current of the access line 11 is equal to the corresponding current of the live line 41 after being overlapped, that is, all the currents of the live lines 41 after being connected with the access line 11 are the same, and at this time, a three-phase equilibrium state is achieved. The invention describes a process for adjusting three-phase balance state by a specific example, wherein the current of three live wires led out from a transformer at the left side of the figure 1 is sequentially recorded as current A, current B and current C from left to right, and the current of three live wires at the upper node of the figure 1 is sequentially recorded as current A from top to bottom 1 Current B 1 Current C 1 The three access line currents behind the node in FIG. 1 are denoted as current A in order from left to right 2 Current B 2 Current C 2 Respectively acquiring ABC three-phase current values and A in FIG. 1 1 B 1 C 1 And A 2 B 2 C 2 A current value;
as can be seen from the figure 1 of the drawings,
phase a current = a 1 +A 2
Phase B current = B 1 +B 2
C-phase current = C 1 +C 2
(1) If the three-phase power load is balanced after the semiconductor test equipment is connected, A 1 =B 1 =C 1 ；
Current a=current b=current C, i.e. the total electrical load delivers a three-phase balance.
(2) If the three-phase power load is unbalanced after the semiconductor test equipment is connected, A 1 ≠B 1 ≠C 1 ；
The invention is realized by dynamically adjusting A 2 B 2 C 2 Current a=current b=current C is guaranteed so that the total electrical load delivery three phases are dynamically maintained balanced.
When the problem of three-phase unbalance is solved, the embodiment can correspondingly set up to avoid the loss of electric energy, and the electric energy is reused. Specifically, the compensation component 1 includes an automatic distribution cabinet 13 and a charge-discharge component 14 connected with the automatic distribution cabinet 13, the automatic distribution cabinet 13 is correspondingly connected to a live wire 41 through an access wire 11, the charge-discharge component 14 is connected to a zero wire 42 through an outgoing wire 12, an induction wire is connected with the charge-discharge component 14, and the charge-discharge component 14 is used for storing input electric energy and releasing electric energy to the live wire 41. By providing the charge-discharge assembly 14, it is possible to store the phase electric power of insufficient power and release it when the automatic distribution cabinet 13 regulates the current of the live wire 41, thereby reducing the energy loss of the present embodiment. In an actual application scenario, the charge-discharge assembly 14 may include at least two groups of battery packs 15, where all the battery packs 15 are connected in parallel and then connected to the automatic distribution cabinet 13 and the zero line 42, and all the battery packs 15 are connected to the automatic distribution cabinet 13 through a multi-power automatic change-over switch. When the battery packs 15 store and release electric energy, the charge and discharge assembly 14 can have a charging state and an electric energy output state simultaneously by providing at least two battery packs 15, and the battery packs 15 in two different states are mutually switched to supply and output, so that the uninterrupted absorption of redundant electric energy for 24 hours is realized; it is possible to avoid that the single battery pack 15 cannot release electric energy when storing electric energy, resulting in that the automatic distribution cabinet 13 cannot quickly adjust the phase-electricity balance in real time. When the battery packs 15 in two different states are switched to supply output, the automatic change-over switch of multiple power supplies is arranged. In addition, when switching the supply outputs to each other, the following schemes may be adopted for determining the battery pack 15 that releases electric energy and the battery pack 15 that stores electric energy; the method comprises the following steps: (1) setting a fixed time (for example, the fixed time is 8 hours) to automatically switch once, and when the automatic switching is performed, the battery pack 15 that releases electric energy and the battery pack 15 that stores electric energy are switched to each other; (2) judging whether to switch according to the magnitude of the current input into the battery pack 15, if the input current is small, indicating that the battery pack 15 is close to a full state, at the moment, switching the battery pack 15 into a state for releasing electric energy, wherein the method can avoid the condition that the battery pack 15 is overcharged, and improve the service life of the battery pack 15; (3) whether to switch is determined according to the voltage of the output battery pack 15, and if the output voltage is low, the output battery pack 15 is switched to a state of storing electric energy at the moment when the electric quantity of the output battery pack 15 is about to run out.
When the automatic distribution cabinet 13 transmits electric energy to the charge and discharge assembly 14, the transmitted electric energy can be monitored. In particular, the device may further comprise a second monitoring assembly arranged between the automatic distribution cabinet 13 and the charging and discharging assembly 14, the second monitoring assembly being in signal connection with the current regulation assembly 3 for monitoring the current through the automatic distribution cabinet 13. By monitoring the current between the automatic distribution cabinet 13 and the charge-discharge assembly 14, it is possible to calculate and determine whether only the electric power for eliminating unbalance is being transmitted to the automatic distribution cabinet 13. When the current between the automatic distribution cabinet 13 and the charging and discharging assembly 14 is calculated and judged, the current is not only used for eliminating unbalanced current, and the situation that the automatic distribution cabinet 13, the battery pack 15 and other components are damaged and short circuit and the like occurs is indicated, so that a certain prompting and alarming effect can be achieved through the monitoring effect of the third monitoring assembly.
In this embodiment, the first current monitoring component 21 and the second current monitoring component 22 are both current transformers. In an actual application scene, the current of the access line 11 and the current of the live wire 41 connected with the access line 11 are monitored through a current transformer, the monitored current result is sent to the current regulation and control assembly 3 (a processor capable of realizing calculation and control functions), the current regulation and control assembly 3 can obtain the current of the access line 11 to be regulated through calculation and analysis according to the current of the access line 11 and the current of the live wire 41, a control signal is generated according to the calculated current of the access line 11 and sent to the automatic distribution cabinet 13, and the automatic distribution cabinet 13 regulates the currents of different access lines 11 according to the control signal, so that the currents of all the live wires 41 connected with the access line 11 are identical, and real-time regulation of three-phase unbalanced load is realized.
In this embodiment, according to the current of each live wire 41 monitored by the first current monitoring component 21, the control compensation component 1 adjusts the current of different access wires 11, including:
collecting the current of each live wire 41 monitored in the first current monitoring assembly 21 to obtain a first current group;
analyzing and comparing the values of all currents in the first current group to obtain the difference value between all currents;
based on the difference value of each current in the first current group, obtaining a compensation value required by each current balance in the first current group, and establishing a corresponding relation between the compensation value and each access line 11;
collecting the current of each access line 11 monitored in the first current monitoring component 21 to obtain a second current group;
determining the current of each access line 11 according to the compensation value and the second current group, and comparing the current with the current value of the second current monitoring component 22 in a verification manner;
the automatic distribution cabinet 13 is controlled to adjust the current of each access line 11; wherein, the current of each access line 11 is equal to the compensation value after the corresponding relation is established.
Through the above steps, the current regulation and control assembly 3 of the present embodiment can determine the current in each access line 11, so as to provide a theoretical basis for adjusting the current of different access lines 11 subsequently.
Further, in order to realize the control of the current input and output of the different access lines 11, the automatic distribution and distribution cabinet 13 may be adaptively set. In one application scenario, as shown in fig. 2, the automatic distribution cabinet 13 may include a power distribution component and a plurality of distribution switch groups connected with the power distribution component in a signal manner, where the distribution switch groups 51 are formed by connecting a plurality of distribution switches in parallel (for example, A1, A2, A3, A4, … … are shown as a distribution switch group 51, B1, B2, B3, B4, … … are shown as a distribution switch group 51, and C1, C2, C3, C4, … … are shown as a distribution switch group 51 in fig. 2), and two ends of the distribution switch group 51 are respectively connected to the charging and discharging component 14 and the access line 11. In fig. 2, items a, B, and C respectively represent different live lines, and item N represents a zero line. Wherein, according to the current of each live wire 41 monitored by the first current monitoring component 21, the control compensation component 1 adjusts the current of different access wires 11, and comprises the following steps:
the current regulating and controlling component 3 obtains the current to be regulated of different access lines 11 according to the current of each live wire 41 monitored by the first current monitoring component 21;
the power distribution component gradually increases the closing quantity of distribution switches corresponding to all the access lines 11 according to the currents to be regulated of different access lines 11;
when the actual current of the access line 11 is equal to the current to be regulated by the access line 11, the closing of the distribution switch of the access line 11 is stopped.
As shown in fig. 3, the charge-discharge assembly 14 of this embodiment is composed of a plurality of parallel-connected cells, each cell is connected with a distribution switch, when the number of the distribution switches is adjusted to adjust the current of the access line 11, the number of the cells of the charge-discharge assembly 14 connected to the access line 11 is adjusted by adjusting the number of the distribution switches, and the current of the access line 11 can be adjusted by increasing or decreasing the number of the cells. In addition, the embodiment can also have the effect of current regulation when the closing number of the distribution switch is regulated by adopting a diode mode. Specifically, two parallel constant current diodes are connected behind each distribution switch, and the current directions of the two constant current diodes are opposite.
In this application scenario, in order to ensure that the adjusted current accuracy meets the predetermined requirement, the number of distribution switches in each distribution switch group may be increased as much as possible, i.e. the current variation when closing the adjacent number of distribution switches may be reduced, thereby improving the accuracy of the current adjustment. Wherein the actual current of the access line 11 is equal to the current to be regulated of the access line 11, and is approximately equal. Specifically, the judgment value may be extended to a value range floating up and down, for example, a value range in which the current to be regulated by the access line 11 is 2A is extended to (2±0.05) a, and when the actual current of the access line 11 is within the value range by closing the distribution switch, the actual current of the access line 11 is regarded as equal to the current to be regulated by the access line 11.
In another application scenario, as shown in fig. 4, the automatic distribution board 13 may include a digital-to-analog converter 61 in signal connection with the current regulation and control assembly 3 and a charging circuit connected to the digital-to-analog converter 61, where the digital-to-analog converter 61 is configured to generate trigger currents of different magnitudes, and the charging circuit regulates the charging current according to the trigger currents. Specifically, the charging circuit may include a PNP-type triode 62, a bridge rectifier 63, a transformer 64 and a capacitor 65, where the bridge rectifier 63, the PNP-type triode 62 and the charging and discharging component 14 are sequentially and circularly connected to form a circulation loop, a base of the PNP-type triode 62 is connected to an anode of the charging and discharging component 14, a collector of the PNP-type triode 62 is connected to an anode of the bridge rectifier 63, and a cathode of the bridge rectifier 63 is connected to a cathode of the charging and discharging component 14. The two coils of the transformer 64 are respectively formed by a live wire 41 and an induction wire, both ends of the induction wire are respectively connected to two half bridges of the bridge rectifier 63, the capacitor 65 is connected in parallel with the bridge rectifier 63, and the digital-to-analog converter 61 is connected with the emitter of the PNP transistor 62. By connecting the capacitor 65 in parallel with the bridge rectifier 63, the ac power leakage due to the abnormality of the bridge rectifier 63 can be filtered out by utilizing the characteristic that the dc power of the capacitor 65 is applied, thereby better protecting the following electrical components (for example, the PNP transistor 62 and the charge-discharge module 14). Wherein, according to the current of each live wire 41 monitored by the first current monitoring component 21, the control compensation component 1 adjusts the current of each charging circuit, and the control compensation component comprises:
the current regulating and controlling component 3 obtains the current to be output by each live wire 41 according to the current of each live wire 41 monitored by the first current monitoring component 21;
taking the current to be output by each live wire 41 as the current to be input by different transformers 64 to obtain the current to be generated by different induction wires;
obtaining the current to be input to the emitter of the PNP triode 62 according to the currents to be generated by different induction lines;
generating a corresponding digital signal according to the current to be input at the emitter of the PNP triode 62 and sending the digital signal to the digital-analog converter 61;
the digital-to-analog converter 61 generates a trigger current to the emitter of the corresponding PNP transistor 62 according to the received digital signal;
the charging circuit changes the charging current of the charging and discharging assembly 14 by triggering the current.
In this application scenario, the current output by the digital-to-analog converter 61 is calculated by the current regulation and control component 3, and then the corresponding current is output by controlling the digital-to-analog converter 61, so that the PNP transistor 62 is influenced by the current of the emitter, and a predetermined proportion of current passes through the circulation loop, and the predetermined proportion of current passes through the transformer 64, so that the electric energy to be stored in the live wire 41 can be input into the charge-discharge component 14 for storage after the voltage of the transformer 64 is regulated.
When the automatic distribution cabinet 13 realizes the charging process of the charging and discharging assembly through the digital-analog converter 61 and the charging circuit, the corresponding structure can be further arranged to realize the discharging process of the charging and discharging assembly 14, the automatic distribution cabinet 13 can comprise an inverter connected with the charging and discharging assembly 14, the inverter is connected with the live wire 41 through the access wire 11, the charging and discharging assembly 14 comprises a discharging management assembly in communication connection with the current regulation and control assembly 3, preferably, the charging and discharging assembly 14 is a storage battery management system (BMS, battery Management System), and the storage battery management system is mainly used for improving the utilization rate of a battery, preventing the battery from overdischarging, prolonging the service life of the battery, monitoring the state of the battery and realizing the controllable discharging of the discharging process. Wherein the inverter may convert the direct current into an alternating current.
The current regulation and control assembly 3 controls the compensation assembly 1 to regulate the current of each access line 11 according to the current of each live wire 41 monitored by the first current monitoring assembly 21, and comprises:
the current regulation and control component 3 generates a current acquisition signal and sends the signal to the digital-analog converter 61;
based on the current acquisition signal, the digital-to-analog converter 61 forms a current trigger signal according to the generated trigger current, and feeds back the current trigger signal to the current regulation and control assembly 3;
the current regulating and controlling component 3 judges whether to generate the current of the access line 11 according to the current trigger signal;
when generating the current of the access line 11, the current regulating and controlling component 3 obtains the current to be generated by different access lines 11 according to the current of each live wire 41 monitored by the first current monitoring component 21;
generating control signals according to currents to be generated by different access lines 11 and sending the control signals to a discharge management component;
the discharge management component adjusts the current output by the charge-discharge component 14 to the access line 11 according to the control signal.
The current regulating and controlling component 3 judges whether to generate the current of the access line 11 according to the current trigger signal, including the current regulating and controlling component 3 judges whether the current time digital-to-analog converter 61 generates the trigger current according to the current trigger signal, when the current time digital-to-analog converter 61 generates the trigger current, the current regulating and controlling component 3 obtains that the corresponding access line 11 does not generate the current when the charging and discharging component 14 of the digital-to-analog converter 61 does not discharge; when the digital-analog converter 61 does not generate the trigger current at the present moment, the current regulating and controlling component 3 obtains that the charging and discharging component 14 of the digital-analog converter 61 can discharge, that is, the corresponding access line 11 can generate the current, and when the current needs to be input to the corresponding live wire through the access line 11, a control signal can be sent to the charging and discharging component 14.
The charging and discharging assembly 14 can realize 24-hour uninterrupted charging (mainly realized by a plurality of groups of battery packs 15 matched with the bridge rectifier) through the arrangement of the bridge rectifier and the inverter; on the basis of having the unbalanced excess power stored, the output voltage can be made more stable (mainly achieved by the battery pack 15 in combination with the inverter).
Besides the effects achieved by the scheme, the invention has at least the following advantages compared with the existing current distribution method:
1. the automatic current distribution cabinet is arranged, so that the three-phase load can be more finely adjusted and controlled;
2. the invention is more convenient in the practical application scene, and the used battery storage modules are fewer, so that the invention has lower cost;
3. the three-phase load allocation of the invention is more suitable for practical operation and is not limited by theory.
The invention also provides a method for eliminating three-phase load unbalance of the semiconductor test equipment, which is realized by the device, and the method can comprise the following steps:
the method comprises the steps that an access line of a compensation assembly is connected with all fire wires in a one-to-one correspondence manner, an outgoing line is connected with a zero line, induction lines are arranged in a one-to-one correspondence manner with all the fire wires, electromagnetic induction is formed, and a first current monitoring assembly is arranged on the access line and the fire wires;
the current regulating and controlling component controls the compensating component to regulate the current of different access lines according to the live wire current monitored in real time, and generates trigger current to regulate the current of each induction line.
The current regulation and control subassembly is according to live wire current value of real-time supervision, and the current of the different access lines of control compensation subassembly regulation includes:
the current regulating and controlling assembly obtains the current of each live wire through the first current monitoring assembly;
obtaining a pre-regulation current of each access line according to the current of the live wire connected with the access line;
and distributing current to each access line according to the preset current control compensation component of each access line.
Obtaining the preset current of each access line according to the current of the live wire after the access line is connected, comprising:
the current regulation and control assembly receives each live wire current monitored by the first current monitoring assembly;
comparing and judging all the live wire currents to obtain currents meeting preset conditions in all the live wires;
according to the current value meeting the preset condition and the monitored current of each live wire, obtaining the current to be compensated of each live wire;
the current regulation and control assembly controls the compensation assembly to regulate the current in the access line corresponding to each live wire according to the current to be compensated of each live wire.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. An apparatus for eliminating three-phase load imbalance of a semiconductor test device, comprising: the system comprises a first current monitoring component, a current regulating component and a compensation component which is connected with a load in parallel on a plurality of live wires and at least one zero wire;
the compensation component is connected with all the live wires in one-to-one correspondence through a plurality of access wires, the outgoing wires are connected with the zero wires, and electromagnetic induction is realized through one-to-one correspondence between the induction wires and all the live wires, so that the current of the access wires and the current of the induction wires are regulated;
the first current monitoring assembly is arranged on an access wire and a fire wire at the rear end of each node and is used for monitoring the current of each access wire and each fire wire, wherein the node is the intersection point of each fire wire and the access wire;
the current regulating and controlling assembly is in signal connection with the compensating assembly and the first current monitoring assembly, and controls the compensating assembly to regulate the current of each access line according to the current of each live wire monitored by the first current monitoring assembly, and generates trigger current to regulate the current of each induction line;
the compensation component comprises an automatic distribution cabinet and a charging and discharging component connected with the automatic distribution cabinet, the automatic distribution cabinet is correspondingly connected to the live wire through an access wire, the charging and discharging component is connected to the zero wire through an outgoing wire, the induction wire is connected with the charging and discharging component, and the charging and discharging component is used for storing input electric energy and releasing electric energy to the live wire;
the automatic distribution cabinet comprises a digital-analog converter connected with the current regulation and control assembly through signals and a charging circuit connected with the digital-analog converter, wherein the digital-analog converter is used for generating trigger currents with different magnitudes, and the charging circuit is used for regulating the charging current according to the trigger currents;
the charging circuit comprises a PNP type triode, a bridge rectifier, a transformer and a capacitor, wherein the bridge rectifier, the PNP type triode and the charging and discharging assembly are sequentially and circularly connected to form a circulation loop, two coils of the transformer are respectively formed by a live wire and an induction wire, two ends of the induction wire are respectively connected to two half-bridges of the bridge rectifier, the capacitor is connected with the bridge rectifier in parallel, and the digital-analog converter is connected with an emitter of the PNP type triode;
according to the current of each live wire monitored by the first current monitoring component, the control compensation component adjusts the current of each charging circuit, and the control compensation component comprises the following components:
the current regulation and control component obtains the current to be output of each live wire according to the current of each live wire monitored by the first current monitoring component;
taking the current to be output of each live wire as the current to be input of different transformers to obtain the current to be generated by different induction wires;
obtaining the current to be input by the emitter of the PNP triode according to the currents to be generated by different induction lines;
generating a corresponding digital signal according to the current to be input by the emitter of the PNP triode and sending the digital signal to the digital-analog converter;
the digital-analog converter generates trigger current to the emitter of the corresponding PNP triode according to the received digital signal;
the charging circuit changes the charging current of the charging and discharging assembly through triggering current;
the charging and discharging assembly comprises a discharging management assembly which is in communication connection with the current regulation and control assembly;
the current regulation and control subassembly is according to the electric current of every live wire of first electric current monitoring component monitoring, and the electric current of every access line is adjusted to control compensation subassembly, includes:
the current regulation and control component generates a current acquisition signal and sends the current acquisition signal to the digital-analog converter;
based on the current acquisition signal, the digital-to-analog converter forms a current trigger signal according to the generated trigger current, and feeds the current trigger signal back to the current regulation and control component;
the current regulating and controlling component judges whether to generate access line current according to the current trigger signal;
when the current of the access line is generated, the current regulating and controlling component obtains the current to be generated of different access lines according to the current of each live wire monitored by the first current monitoring component;
generating control signals according to currents to be generated by different access lines and sending the control signals to a discharge management assembly;
the discharging management component adjusts the current output to the access line by the charging and discharging component according to the control signal.
2. The apparatus of claim 1, wherein the charge and discharge assembly comprises at least two battery packs, all of which are connected in parallel and then connected to the automatic distribution cabinet and the neutral line, respectively, and all of which are connected to the automatic distribution cabinet by a multi-power automatic transfer switch.
3. The apparatus of claim 1, wherein the automatic distribution cabinet comprises an inverter connected to the charge and discharge assembly, the inverter being connected to the hot line via an access line.
4. The apparatus of claim 1, further comprising a second current monitoring assembly disposed between the automatic distribution cabinet and the charge-discharge assembly, the second current monitoring assembly in signal communication with the current regulation assembly for monitoring current through the automatic distribution cabinet.
5. The apparatus of claim 4, wherein the first current monitoring component and the second current monitoring component are each current transformers.
6. The apparatus of claim 4 wherein the control compensation assembly adjusts the current of the different access lines based on the current of each of the hot wires monitored by the first current monitoring assembly, comprising:
collecting the current of each live wire monitored in the first current monitoring assembly to obtain a first current group;
analyzing and comparing the values of all currents in the first current group to obtain the difference value between all currents;
based on the difference value of each current in the first current group, obtaining a compensation value required by each current balance in the first current group, and establishing a corresponding relation between the compensation value and each access line;
collecting the current of each access line monitored in the first current monitoring assembly to obtain a second current group;
determining the current of each access line according to the compensation value and the second current group, and verifying and comparing the current with the current value of the second current monitoring component;
and controlling the automatic distribution cabinet to adjust the current of each access line.
7. A method of eliminating three-phase load imbalance of a semiconductor test apparatus, the method being implemented by the apparatus of any one of claims 1-6, the method comprising the steps of:
the method comprises the steps that an access line of a compensation assembly is connected with all fire wires in a one-to-one correspondence manner, an outgoing line is connected with a zero line, induction lines are arranged in a one-to-one correspondence manner with all the fire wires, and a first current monitoring assembly is arranged on the access line and the fire wires;
the current regulating and controlling component controls the compensating component to regulate the current of different access lines according to the live wire current monitored in real time, and generates trigger current to regulate the current of each induction line.
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Address after: Room F1066, 1st Floor, Building 1 (South), No. 368 Liuhe Road, Puyan Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Xinyun Semiconductor Group Co.,Ltd. Country or region after: China Address before: Room F1066, 1st Floor, Building 1 (South), No. 368 Liuhe Road, Puyan Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Xinyun Semiconductor Technology Co.,Ltd. Country or region before: China |