CN220234270U - Power grid power failure prevention protection device applied to aging device - Google Patents
Power grid power failure prevention protection device applied to aging device Download PDFInfo
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- CN220234270U CN220234270U CN202321821780.7U CN202321821780U CN220234270U CN 220234270 U CN220234270 U CN 220234270U CN 202321821780 U CN202321821780 U CN 202321821780U CN 220234270 U CN220234270 U CN 220234270U
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- 230000032683 aging Effects 0.000 title claims abstract description 56
- 230000002265 prevention Effects 0.000 title claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000002955 isolation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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Abstract
The utility model discloses an anti-power-failure protection device applied to an aging device, which comprises a power grid voltage monitoring circuit, an aging device total load collector, a main controller and a power-failure protection system, wherein the main controller is connected with the power grid voltage monitoring circuit; the output end of the aging device current and voltage acquisition circuit and the output end of the aging device total load acquisition device are respectively connected with the main controller; the power-down protection system comprises a protection switch QF1 connected with a power grid, wherein the other end of the protection switch QF1 is connected with one end of an LCL filter, and the other end of the LCL filter is connected with one end of a bidirectional AC/DC circuit; the other end of the bidirectional AC/DC circuit is connected with one end of the bidirectional DC/DC circuit; the other end of the bidirectional DC/DC circuit is connected with the positive and negative terminals of the total voltage of the battery. The device starts a power-down protection system to perform power-down protection when the three-phase power grid is powered down; the device releases the corresponding battery cluster computer for the aging box on the alternating current bus, and further can provide uninterrupted power for the aging box, so that the chip damage caused by power failure of the three-phase power grid is avoided.
Description
Technical Field
The utility model relates to the field of power failure protection, in particular to a power failure protection device for an electric network, which is applied to an aging device.
Background
Currently, one test item in the chip industry is burn-in, which requires the application of specific voltages and signals to the chip at high temperatures (85 ℃, 105 ℃ or 125 ℃). There are two general forms of aging, one is the use of a circuit aging box that integrates a high temperature box, voltage and signal, the circuit aging box being directly connected to the grid. In yet another form, the burn-in module is implemented by a signal source, a voltage source, a burn-in board, and a high temperature box, wherein the signal source applies a signal to the chip to be burned-in, the voltage source applies a voltage to the chip to be burned-in, and the burn-in board is a burn-in chip carrier, and is a high Wen Xiangdi high temperature burn-in environment. The chip has higher requirements on environment and aging conditions, sudden power failure accidents exist in the domestic power grid, and if the chip encounters sudden power failure in the aging process, irrecoverable accidents can be caused to the chip. Particularly, if the chip is damaged due to sudden power failure in the testing process, the subsequent product delivery will be seriously affected, so that the chip damage in the aging process caused by power failure of the power grid is avoided.
Disclosure of Invention
Aiming at the defects in the prior art, the power-down protection device for the power grid, which is applied to the aging device, provided by the utility model, solves the problem that the chip is damaged in the aging process due to power down of the power grid.
In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:
the utility model provides a prevent electric wire netting protection device that falls that is applied to ageing device, it includes electric wire netting voltage monitoring circuit, ageing device total load collector, master controller and falls power protection system; the output end of the aging device current and voltage acquisition circuit and the output end of the aging device total load acquisition device are respectively connected with the main controller;
the power-down protection system comprises a protection switch QF1 connected with a power grid, wherein the other end of the protection switch QF1 is connected with one end of a filter L1, and the other end of the filter L1 is respectively connected with one end of a capacitor bank C1 and one end of a filter L2; the other end of the filter L2 is connected with one end of the bidirectional AC/DC circuit; the other end of the bidirectional AC/DC circuit is connected with one end of the bidirectional DC/DC circuit; the other end of the bidirectional DC/DC circuit is connected with the positive and negative terminals of the total voltage of the battery; the filter L1, the capacitor bank C1 and the filter L2 form an LCL filter;
the main controller is respectively connected with the bidirectional AC/DC circuit and the bidirectional DC/DC circuit through the driving boards.
Further, the grid voltage monitoring circuit comprises a voltage dividing circuit, an isolation amplifier, a differential amplifier and an analog-to-digital converter which are sequentially connected.
Further, a capacitor C2 is connected in parallel between the bidirectional AC/DC circuit and the bidirectional DC/DC circuit.
Further, a capacitor C3 is connected between the positive terminal and the negative terminal of the total voltage of the battery, and one end of the capacitor C3 is respectively connected with the negative terminal of the total voltage of the battery and the negative electrode of the bidirectional DC/DC circuit; the other end of the capacitor C3 is respectively connected with one end of the filter L3 and the total high-voltage positive terminal of the battery; the other end of the filter L3 is connected with the positive pole of the bidirectional DC/DC circuit.
Further, the capacitor group C1 comprises three capacitors which are connected end to end in sequence, and the connecting end of each two capacitors is connected with one phase of the three-phase power grid.
Further, the aging device total load collector comprises a current transformer and a voltage collector, and current and voltage of the aging device are respectively collected, so that the aging device total load is obtained.
The beneficial effects of the utility model are as follows: the device monitors whether the three-phase power grid is powered down or not through the power grid voltage monitoring circuit, so that a power-down protection system is started to perform power-down protection when the three-phase power grid is powered down; the device obtains the total load of the aging device through the total load collector of the aging device, so that a computer of a corresponding battery cluster is released for an aging box on an alternating current bus, uninterrupted power supply can be provided for the aging box, and the chip damage caused by power failure of a three-phase power grid is avoided.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a power-down protection system of the present device;
FIG. 2 is a schematic diagram of a grid voltage monitoring circuit;
FIG. 3 is a flow chart of charging a battery in an embodiment;
fig. 4 is a schematic flow chart of power supply protection for the aging device in the embodiment.
Detailed Description
The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the power-down protection device for the power grid applied to the aging device comprises a power grid voltage monitoring circuit, an aging device total load collector, a main controller and a power-down protection system; the output end of the aging device current and voltage acquisition circuit and the output end of the aging device total load acquisition device are respectively connected with the main controller;
the power-down protection system comprises a protection switch QF1 connected with a power grid, wherein the other end of the protection switch QF1 is connected with one end of a filter L1, and the other end of the filter L1 is respectively connected with one end of a capacitor bank C1 and one end of a filter L2; the other end of the filter L2 is connected with one end of the bidirectional AC/DC circuit; the other end of the bidirectional AC/DC circuit is connected with one end of the bidirectional DC/DC circuit; the other end of the bidirectional DC/DC circuit is connected with the positive and negative terminals of the total voltage of the battery; the filter L1, the capacitor bank C1 and the filter L2 form an LCL filter; the LCL filter can filter high-frequency components, can inhibit the impact current of a power grid side to a certain extent, and has better inhibition performance on current harmonics of AC/DC grid connection;
the main controller is respectively connected with the bidirectional AC/DC circuit and the bidirectional DC/DC circuit through the driving boards.
As shown in fig. 2, the grid voltage monitoring circuit includes a voltage dividing circuit, an isolation amplifier, a differential amplifier and an analog-to-digital converter which are sequentially connected. The voltage dividing circuit is used for serially connecting resistors to divide voltage, converting the power grid voltage into input voltage of the later-stage isolation amplification, and amplifying the voltage after the isolation amplification by the differential amplifier for acquisition by the analog-digital converter. And the collected voltage data is sent to the main controller to judge the voltage value, when the collected voltage data is smaller than the preset voltage value, the main controller judges that the power grid is powered down, and a driving signal is respectively sent to the bidirectional AC/DC circuit and the bidirectional DC/DC circuit through the driving board, so that the bidirectional AC/DC circuit and the bidirectional DC/DC circuit supply the electric energy of the battery to the aging device. The master controller can adopt STM32 series singlechip to carry out voltage comparison, and the prior art that control command was STM32 series singlechip is produced according to the comparison result is not the innovation point of this device, and is not repeated here.
In the implementation process, a capacitor C2 is connected in parallel between the bidirectional AC/DC circuit and the bidirectional DC/DC circuit. A capacitor C3 is connected between the positive terminal and the negative terminal of the total voltage of the battery, and one end of the capacitor C3 is respectively connected with the negative terminal of the total voltage of the battery and the negative electrode of the bidirectional DC/DC circuit; the other end of the capacitor C3 is respectively connected with one end of the filter L3 and the total high-voltage positive terminal of the battery; the other end of the filter L3 is connected with the positive pole of the bidirectional DC/DC circuit.
The capacitor group C1 comprises three capacitors which are connected end to end in sequence, and the connecting end of each two capacitors is connected with one phase of the three-phase power grid. The aging device total load collector comprises a current transformer and a voltage collector, and current and voltage of the aging device are respectively collected, so that the aging device total load is obtained.
In the specific implementation process, the protection switch QF1 can adopt an electric control switch, and when the voltage of the power grid is too high or other conditions possibly damaging a power failure protection system occur, the protection switch QF1 can actively disconnect subsequent electric devices from the power grid.
As shown in fig. 3 and 4, fig. 3 is a charging flow, and fig. 4 is a power supply flow. The main controller can monitor information such as battery voltage, SOC, battery compartment temperature and the like in real time through communication with the battery BMS. When the main controller detects that the battery SOC is lower than a set value, the main controller controls a driver (PWM driver) to drive a bidirectional AC/DC circuit to convert the grid alternating current into direct current so as to charge the battery. After the battery is fully charged, the battery BMS transmits information to the master controller, and the master controller stops charging the battery. If the main controller detects that the SOC of the battery is higher than the set value, the power-down protection system is kept in a standby state. The acquisition of the related information by the communication between the main controller and the battery BMS is not innovative of the device in the prior art, and is not repeated here.
The power-down protection system has batteries for storing and discharging electric energy, and the battery clusters are configured as follows:
it is assumed that the AC bus is provided with 12 chip aging boxes, 380Vac is adopted for power supply, the rated power of a single aging box is 8kW, and the total power of other matched use on the AC bus is 1kW. The rated maximum power on the alternating current bus is 97KW; therefore, the rated discharge power of the power failure protection system is at least 97kW. Assuming that a high-rate lithium titanate battery is used, 10min and 10-rate discharge are supported, it is known that the battery cluster can only satisfy 14.7A discharge under rated conditions, namely, the total discharge capacity is q1=97x10/60=16.1 (kWh) in 10min and 97KW.
Assuming that the discharge depth of the 10-rate discharge cell is 70%, the actual total capacity of the battery is not lower than: q2=16.1/0.7=23 kWh. Considering the problems of battery attenuation, efficiency and the like, the total capacity of the battery system design should not be lower than: q3=23/0.8=28.75 kWh. Assuming that the specification of the single cell is 3.20V/100Ah, the total system voltage is as follows: u=28.75/100×1000=287.5v, the number of cell series is 287.5/3.2=90, so in order to meet the above power supply requirement, the battery cluster only needs to connect 90 cell series with 3.20V/100Ah standard.
The drive board is connected to an internal NTC of the bi-directional AC/DC circuit with a power device. The main controller monitors the junction temperature inside the power device in real time, the over-high temperature protection can be started, the main controller can be connected with the driving plate through optical fibers, and the reliability of the system can be effectively enhanced.
The device can be added with an audible and visual alarm system, when the power grid is powered down or the voltage is lower than a preset value, the system gives out an audible and visual alarm, and related personnel need to normally close the aging system according to the flow within the supporting time. When the power grid recovers within the design time, the shutdown aging box is started, and meanwhile, the power-down protection system shuts down the electric energy output.
In summary, the three-phase power grid is monitored whether to power down through the power grid voltage monitoring circuit, so that the power down protection system is started to perform power down protection when the three-phase power grid is powered down; the device obtains the total load of the aging device through the total load collector of the aging device, so that a computer of a corresponding battery cluster is released for an aging box on an alternating current bus, uninterrupted power supply can be provided for the aging box, and the chip damage caused by power failure of a three-phase power grid is avoided.
Claims (6)
1. The power-down protection device for the power grid is characterized by comprising a power grid voltage monitoring circuit, an aging device total load collector, a main controller and a power-down protection system; the output end of the aging device current and voltage acquisition circuit and the output end of the aging device total load acquisition device are respectively connected with the main controller;
the power-down protection system comprises a protection switch QF1 connected with a power grid, wherein the other end of the protection switch QF1 is connected with one end of a filter L1, and the other end of the filter L1 is respectively connected with one end of a capacitor bank C1 and one end of a filter L2; the other end of the filter L2 is connected with one end of the bidirectional AC/DC circuit; the other end of the bidirectional AC/DC circuit is connected with one end of the bidirectional DC/DC circuit; the other end of the bidirectional DC/DC circuit is connected with the positive and negative terminals of the total voltage of the battery; the filter L1, the capacitor bank C1 and the filter L2 form an LCL filter;
the main controller is respectively connected with the bidirectional AC/DC circuit and the bidirectional DC/DC circuit through the driving boards.
2. The power grid power failure prevention protection device for an aging device according to claim 1, wherein the power grid voltage monitoring circuit comprises a voltage dividing circuit, an isolation amplifier, a differential amplifier and an analog-to-digital converter which are connected in sequence.
3. The power-down protection device for an aging device according to claim 1, wherein a capacitor C2 is connected in parallel between the bidirectional AC/DC circuit and the bidirectional DC/DC circuit.
4. The power-down protection device for the power grid applied to the aging device according to claim 1, wherein a capacitor C3 is connected between the positive terminal and the negative terminal of the total voltage of the battery, and one end of the capacitor C3 is respectively connected with the negative terminal of the total voltage of the battery and the negative electrode of the bidirectional DC/DC circuit; the other end of the capacitor C3 is respectively connected with one end of the filter L3 and the total high-voltage positive terminal of the battery; the other end of the filter L3 is connected with the positive pole of the bidirectional DC/DC circuit.
5. The power-down protection device for an aging device according to claim 1, wherein the capacitor group C1 comprises three capacitors connected end to end in sequence, and the connection end of each two capacitors is connected with one phase of the three-phase power grid.
6. The power-down protection device for an aging device according to claim 1, wherein the aging device total load collector comprises a current transformer and a voltage collector, and the current and the voltage of the aging device are collected respectively, so that the aging device total load is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321821780.7U CN220234270U (en) | 2023-07-12 | 2023-07-12 | Power grid power failure prevention protection device applied to aging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321821780.7U CN220234270U (en) | 2023-07-12 | 2023-07-12 | Power grid power failure prevention protection device applied to aging device |
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| Publication Number | Publication Date |
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| CN220234270U true CN220234270U (en) | 2023-12-22 |
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| CN202321821780.7U Active CN220234270U (en) | 2023-07-12 | 2023-07-12 | Power grid power failure prevention protection device applied to aging device |
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| CN (1) | CN220234270U (en) |
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- 2023-07-12 CN CN202321821780.7U patent/CN220234270U/en active Active
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