High-voltage lithium battery detection device of forklift

Abstract

A high-voltage lithium battery detection device of a forklift comprises a shell, a first circuit module, a second circuit module and a third circuit module, wherein the first circuit module, the second circuit module and the third circuit module are located in the shell and arranged in a mutually isolated mode. The first circuit module is connected with the high-voltage lithium battery module to collect the current and voltage of the high-voltage lithium battery module and the voltage of the insulation resistor; the second circuit module is provided with an MCU unit and a power supply unit, the MCU unit is connected with the first circuit module to obtain and process the collected current and voltage to obtain current information, voltage information and insulation resistance information of the high-voltage lithium battery module, and the power supply unit is connected with the high-voltage lithium battery module, the MCU unit and the first circuit module through isolation to supply power; and the third circuit module is connected with the second circuit module so as to transmit current information and voltage information of the high-voltage lithium battery module and voltage information of the insulation resistor. The method does not depend on the installation position of the BMS controller, avoids the line transmission interference problem, and improves the collection precision.

Description

Technical Field

[0001] The present invention relates to the field of forklifts, and in particular to a high-voltage lithium battery detection device for forklifts. Background Art

[0002] An electric forklift is a forklift powered by a lithium battery. At present, current acquisition, insulation resistance detection, and high-voltage acquisition are mainly integrated on the BMS control board. However, the current acquisition position is mainly at the negative end of the battery, and the insulation resistance detection position and the high-voltage detection position are mainly concentrated near the charge and discharge contactors. Limited by the installation position of the BMS control board, these signals need to be connected to the BMS control board through acquisition lines. If the transmission line is too long, the anti-interference ability is reduced, affecting the acquisition accuracy of the current, and easily causing false alarm faults in insulation resistance detection and high-voltage acquisition signals.

[0003] At present, the existing power battery current acquisition device uses two Hall current sensors to acquire current, with a high cost and low accuracy of the Hall current sensors. This current acquisition device is independent of the battery management system, requires separate design and occupies space, and only involves current acquisition. The existing insulation resistance detection circuit needs to be designed and installed separately or integrated into the BMS control board, and does not involve the connection method with the control loop. There is also an insulation resistance detection circuit that uses ADC conversion and digital isolation to convert analog signals into digital signals. It only involves one type of circuit for insulation resistance detection, needs to be designed and installed separately or integrated into the BMS control board, and communicates with the controller using digital signals, and the transmission path is easily interfered. Summary of the Invention

[0004] The main purpose of the present invention is to overcome the defects existing in the existing power battery detection, and propose a high-voltage lithium battery detection device for forklifts, which does not depend on the installation position of the BMS controller, avoids the problem of line transmission interference and improves the acquisition accuracy.

[0005] The present invention adopts the following technical solutions:

[0006] A high-voltage lithium battery detection device for a forklift, which is connected to a high-voltage lithium battery module. It is characterized in that it includes a housing and a first circuit module, a second circuit module and a third circuit module that are isolated from each other and arranged inside the housing; the first circuit module is connected to the high-voltage lithium battery module to collect the current, voltage and voltage of the insulation resistance of the high-voltage lithium battery module; the second circuit module is provided with an MCU unit and a power supply unit, and the MCU unit is connected to the first circuit module to obtain the collected current and voltage for processing to obtain the current information, voltage information and insulation resistance information of the high-voltage lithium battery module, and the power supply unit is connected to the high-voltage lithium battery module, the MCU unit and the first circuit module through isolation for power supply; the third circuit module is connected to the second circuit module to transmit the current information, voltage information and voltage information of the insulation resistance of the high-voltage lithium battery module.

[0007] Further, the first circuit module includes a current acquisition unit, a voltage acquisition unit, an insulation resistance detection unit and a conversion unit. The current acquisition unit and the voltage acquisition unit are connected to the high-voltage lithium battery module to respectively collect current and voltage. The insulation resistance detection unit is connected between the high-voltage lithium battery module and the housing to detect the voltage of the insulation resistance; the conversion unit is connected to the current acquisition unit, the voltage acquisition unit and the insulation resistance detection unit to perform analog-to-digital conversion on the voltage, the current and the voltage of the insulation resistance and then send them to the MCU unit.

[0008] Further, the current acquisition unit includes a shunt and a current interface. The shunt is connected to the high-voltage lithium battery module, and the current interface is connected to the shunt. The conversion unit is provided with a first ADC chip, and the first ADC chip is connected to the current interface to collect the current for analog-to-digital conversion and then send it to the MCU unit.

[0009] Further, the voltage acquisition unit includes a high-voltage voltage-dividing acquisition chip and a high-voltage interface. The high-voltage interface is connected to the high-voltage lithium battery module and a fuse. The high-voltage voltage-dividing acquisition chip is connected to the high-voltage interface to collect the total voltage, charging port voltage, discharge port voltage and voltage at the back end of the fuse of the high-voltage lithium battery module; the conversion unit is provided with a second ADC chip, and the second ADC chip is connected to the high-voltage voltage-dividing acquisition chip to perform analog-to-digital conversion on the collected voltage and then send it to the MCU unit.

[0010] Further, the insulation resistance detection unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a contactor KA1, a contactor KA2, a contactor KA3, a first operational amplifier chip U8, and a second operational amplifier chip U9; the resistor R1, the contactor KA1, the resistor R2, the resistor R3, the contactor KA2, and the resistor R4 are sequentially connected in series between the two ends of the high-voltage lithium battery pack, the input end of the first operational amplifier chip U8 is connected between the contact of the contactor KA1 and the resistor R2, the input end of the second operational amplifier chip U9 is connected between the contact of the contactor KA2 and the resistor R3, one contact of the contactor KA3 is connected between the resistor R2 and the resistor R3, and the other contact is connected to the housing; the MCU unit is connected to control the contactor KA1, the contactor KA2, and the contactor KA3 to be turned on or off to detect the voltage across the resistor R2 and the voltage across the resistor R3; the conversion unit is connected to the first operational amplifier chip U8 and the second operational amplifier chip U9 to perform analog-to-digital conversion and then send it to the MCU unit to calculate the insulation resistance information.

[0011] Further, a digital isolation unit is further included, and the digital isolation unit is connected between the MCU unit and the conversion unit to achieve electrical isolation.

[0012] Further, a first isolated power supply unit is further included; the first isolated power supply unit is connected between the power supply unit and the first circuit module to achieve electrical isolation.

[0013] Further, a second isolated power supply unit is further included; the second isolated power supply unit is connected between the power supply unit and the third circuit module to achieve electrical isolation.

[0014] Further, the third circuit module includes a CAN interface and an isolated CAN chip, the isolated CAN chip is connected to the MCU unit, and the CAN interface is connected to the isolated CAN chip to transmit the current information, voltage information, and insulation resistance information of the high-voltage lithium battery module to the outside.

[0015] Further, a buck module is connected to the high-voltage lithium battery module; the power supply unit includes a power interface, a common-mode inductor L1, and a BUCK chip; the power interface is connected to the buck module, and the common-mode inductor L1 is connected between the power interface and the BUCK chip.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, it includes a housing and a first circuit module, a second circuit module, and a third circuit module that are located inside the housing and are isolated from each other. The first circuit module collects the current, voltage, and the voltage of the insulation resistance of the high-voltage lithium battery module. The second circuit module is provided with an MCU unit and a power supply unit. The MCU unit processes the collected current, voltage, and the voltage of the insulation resistance to obtain the current information, voltage information, and insulation resistance information of the high-voltage lithium battery module. The power supply unit supplies power to the MCU unit, the first circuit module, and the second circuit module. The third circuit module transmits the current information, voltage information, and insulation resistance information of the high-voltage lithium battery module to the outside through CAN communication, without relying on the installation position of the BMS controller, and avoids the problem of line transmission interference and improves the acquisition accuracy.

[0018] 2. In the present invention, the first circuit module includes a current acquisition unit, a voltage acquisition unit, an insulation resistance detection unit, a conversion unit, etc., integrating current acquisition, insulation resistance detection, high-voltage acquisition, etc. together, facilitating installation close to the acquisition position and reducing the parasitic inductance of the line. The third circuit module includes a CAN interface and an isolated CAN chip, communicating with the external BMS controller through the isolated CAN chip to enhance the anti-interference performance.

[0019] 3. The present invention is also provided with a digital isolation unit, a first isolation power supply unit, a second isolation power supply unit, etc., electrically isolating current acquisition, insulation resistance detection, high-voltage acquisition, CAN communication from the MUC unit, avoiding the interference at the high-voltage lithium battery module end from being transmitted to the single-chip microcomputer system and enhancing the stability of the data. At the same time, data interaction is achieved between current acquisition, high-voltage acquisition, CAN communication, and insulation resistance detection through isolation, avoiding the mutual influence between signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the circuit diagram of the present invention;

[0021] Figure 2 is the module diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following further describes the present invention through specific embodiments.

[0023] The terms "first", "second", etc. that appear in the present invention are only for convenient description to distinguish different components with the same name, and do not indicate the sequence or primary-secondary relationship.

[0024] In the description of the present invention, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "front" and "rear" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0025] In addition, in the description of the present application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0026] See Figure 1 and Figure 2 , a high-voltage lithium battery detection device for a forklift, connected to a high-voltage lithium battery module B1, including a housing and a first circuit module Reg1, a second circuit module Reg2, and a third circuit module Reg3 that are located inside the housing and are isolated from each other. The first circuit module Reg1 is connected to the high-voltage lithium battery module B1. The first circuit module Reg1 is used to collect relevant current, voltage, and voltage of the insulation resistance of the high-voltage lithium battery module B1. The second circuit module Reg2 is provided with an MCU unit U2 and a power supply unit. The MCU unit U2 is connected to the first circuit module Reg1 to obtain the collected current and voltage for processing to obtain current information, voltage information, and insulation resistance information of the high-voltage lithium battery module B1. The power supply unit is connected to the high-voltage lithium battery module B1, the MCU unit U2, and the first circuit module Reg1. The power supply unit is used to obtain the voltage of the high-voltage lithium battery module B1, convert it, and supply power to the MCU unit U2, the first circuit module Reg1, etc. The third circuit module Reg3 is connected to the second circuit module Reg2 to transmit current information, voltage information, and insulation resistance information of the high-voltage lithium battery module B1. The third circuit module Reg3 is also powered by the power supply unit.

[0027] Among them, the first circuit module Reg1 includes a current acquisition unit, a voltage acquisition unit, an insulation resistance detection unit, and a conversion unit. The current acquisition unit and the voltage acquisition unit are connected to the high-voltage lithium battery module B1 to respectively collect current and voltage, that is, the relevant current of the high-voltage lithium battery module is collected through the current acquisition unit, and the relevant voltage of the high-voltage lithium battery module is collected through the voltage acquisition unit. The insulation resistance detection unit is connected between the high-voltage lithium battery module B1 and the housing to detect voltage, and the insulation resistance is calculated through the detected voltage. The conversion unit is connected to the current acquisition unit, the voltage acquisition unit, and the insulation resistance detection unit to perform analog-to-digital conversion on the voltage and current and then send them to the MCU unit U2.

[0028] Specifically, the current acquisition unit includes a shunt and a current interface P3. The shunt is connected in series to the positive electrode of the high-voltage lithium battery pack. The current interface P3 is connected to the shunt, and the shunt is used to acquire current with high precision. The conversion unit is provided with a first ADC chip U3. The first ADC chip U3 is connected to the current interface P3, acquires the current, performs analog-to-digital conversion, and then sends it to the MCU unit U2. The current signal acquired by the shunt is collected and amplified by the first ADC chip U3 via the current interface P3 and converted into a digital quantity, and then transmitted to the MCU unit U2. It can be collected by the SPI01 channel of the MCU unit U2, that is, SPI communication is used to achieve data isolation transmission.

[0029] The voltage acquisition unit includes a high-voltage voltage-dividing acquisition chip U10 and a high-voltage interface P2. The high-voltage interface P2 is connected to the high-voltage lithium battery module B1 and the fuse. The high-voltage voltage-dividing acquisition chip U10 is connected to the high-voltage interface P2 to acquire the total voltage, charging port voltage, discharging port voltage, and voltage at the rear end of the fuse of the high-voltage lithium battery module B1, etc. The conversion unit is provided with a second ADC chip U6. The second ADC chip U6 is connected to the high-voltage voltage-dividing acquisition chip U10 to perform analog-to-digital conversion on the acquired voltage and then send it to the MCU unit U2, and SPI communication is used to achieve data isolation transmission.

[0030] Specifically, the negative electrode of the high-voltage lithium battery module B1 is connected to one end of the fuse FUSE. The other end of the fuse FUSE is connected to one contact of the contactor KA4 and one contact of the contactor KA5. The other contacts of the contactor KA4 and the contactor KA5 are respectively connected to the charging port and the discharging port, that is, charging is turned on or off through the contactor KA4, and discharging is turned on or off through the contactor KA5. One of the first input terminals of the voltage-dividing acquisition chip U10 is connected to the negative electrode of the high-voltage lithium battery module B1 via the high-voltage interface P2, the second input terminal of the high-voltage interface P2 is connected to the fuse FUSE, and the third and fourth input terminals are respectively connected to the charging port and the discharging port via the high-voltage interface P2, so as to realize the acquisition of the total voltage, charging port voltage, discharging port voltage, and voltage at the rear end of the fuse of the high-voltage lithium battery module B1, etc. The MCU unit U2 obtains the relevant state of the high-voltage lithium battery module B1 by acquiring these voltages, and the acquisition of the charging port voltage and the discharging port voltage is used to determine whether the contacts of the contactor KA4 and the contactor KA5 are stuck, etc. The second ADC chip U6 is connected to the voltage-dividing acquisition chip U10, converts the acquired voltage into a digital quantity, and then sends it to the MCU unit U2 after signal isolation.

[0031] The insulation resistance detection unit includes resistor R1, resistor R2, resistor R3, resistor R4, contactor KA1, contactor KA2, contactor KA3, the first operational amplifier chip U8 and the second operational amplifier chip U9; resistor R1, contactor KA1, resistor R2, resistor R3, contactor KA2 and resistor R4 are sequentially connected in series between the two ends of the high-voltage lithium battery pack. One end of resistor R1 can be connected to the negative electrode of the high-voltage lithium battery pack B1 through the high-voltage interface P2, and the other end of resistor R4 is connected to the shunt on the positive electrode of the high-voltage lithium battery module B1 through the current interface P3. The input end of the first operational amplifier chip U8 is connected between the contact of contactor KA1 and resistor R2, and the input end of the second operational amplifier chip U9 is connected between the contact of contactor KA2 and resistor R3. One contact of contactor KA3 is connected between resistor R2 and resistor R3, and the other contact is connected to the housing. The conversion unit is connected to the first operational amplifier chip U8 and the second operational amplifier chip U9 to perform analog-to-digital conversion and then send it to the MCU unit U2 to calculate the insulation resistance information. The first operational amplifier chip U8 and the second operational amplifier chip U9 are connected to the second ADC conversion chip U6, and analog-to-digital conversion is performed through the second ADC conversion chip U6.

[0032] The MCU unit U2 is connected to control the opening or closing of contactors KA1, KA2 and KA3 to detect the voltage across resistor R2 and the voltage across resistor R3. The MCU unit U2 can use a single-chip microcomputer. Specifically, the MCU unit U2 controls the contactor KA3 to close, and its normally open contact is connected to the housing to enable the insulation detection function. The MCU unit U2 alternately controls the contactors KA1 and KA2 to close. The first operational amplifier chip U8 collects the voltage Ur2 across resistor R2, and the second operational amplifier chip U9 collects the voltage Ur3 across resistor R3. After amplifying the collected voltage, it is sent to the MCU unit U2 through analog-to-digital conversion by the second ADC conversion chip U6 to calculate the resistance values of the insulation resistances Rp and Rn, and the insulation performance of the high-voltage lithium battery module B1 is judged according to the resistance values. Among them, Rp represents the insulation resistance of the positive electrode of the high-voltage lithium battery module B1 to the housing, and Rn represents the insulation resistance of the negative electrode of the high-voltage lithium battery module B1 to the housing.

[0033] The third circuit module Reg3 includes a CAN interface P4 and an isolated CAN chip U5. The isolated CAN chip U5 is connected to the MCU unit U2, and CAN communication is used between the isolated CAN chip U5 and the MCU unit U2. The CAN interface P4 is connected to the isolated CAN chip U5 to transmit the current information, voltage information and insulation resistance information of the high-voltage lithium battery module B1 to the outside. Through the isolated CAN chip U5, the MCU unit U2 is connected to the external CAN communication network, and current data, high-voltage fault information, battery insulation resistance fault information, etc. are transmitted to the battery management system BMS.

[0034] The negative electrode of the high-voltage lithium battery module B1 is connected to a step-down module D2. The voltage output by the high-voltage lithium battery module B1 is stepped down by the step-down module D2. For example, the voltage V+ is stepped down to 12V, and the negative terminal of the 12V power supply is connected to the housing. The power supply unit includes a power interface P1, a common-mode inductor L1, a BUCK chip U1, etc. The power interface P1 is connected to the step-down module D2, the common-mode inductor L1 is connected between the power interface and the BUCK chip U1, and the BUCK chip U1 is used to step down the input voltage again. For example, it converts 12V to 5V. The 12V power supply output by the step-down module D2 of the present invention is connected to the power interface P1, connected to the BUCK chip U1 through the common-mode inductor L1, and the BUCK chip U1 is connected to the MCU unit U2 to provide a 5V power supply for the MCU unit U2.

[0035] In the present invention, the first circuit module Reg1, the second circuit module Reg2, and the third circuit module Reg3 are arranged in isolation from each other, and specifically include a digital isolation unit, a first isolation power supply unit, a second isolation power supply unit, etc. The digital isolation unit is connected between the MCU unit U2 and the conversion unit to achieve electrical isolation, and includes a digital isolation chip U4 and a digital isolation chip U7. The digital isolation chip U4 is connected between the first ADC chip U3 and the MCU unit U2, and the digital isolation chip U7 is connected between the second ADC chip U6 and the MCU unit U2. The first isolation power supply unit is connected between the power supply unit and the first circuit module Reg1 to achieve electrical isolation. In the figure, the first isolation power supply unit uses an isolation power supply L2, its input terminal is connected to the power interface P1, and the output terminal is connected to the first ADC chip U3 and the second ADC chip U6, stepping down the 12V power supply to output a 5V voltage to supply power to the first ADC chip U3 and the second ADC chip U6. The second isolation power supply unit is connected between the power supply unit and the third circuit module Reg3 to achieve electrical isolation. The second isolation power supply unit uses an isolation power supply L3, its input terminal is connected to the output terminal of the BUCK chip U1, and the output terminal of the isolation power supply L3 is connected to the isolated CAN chip U5 of the third circuit module Reg3 to provide a 5V power supply for the isolated CAN chip U5.

[0036] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A high-voltage lithium battery detection device for a forklift, which is connected to a high-voltage lithium battery module, and is characterized in that, It includes a housing and a first circuit module, a second circuit module, and a third circuit module that are located inside the housing and are isolated from each other; the first circuit module is connected to the high-voltage lithium battery module to collect the current, voltage, and voltage of the insulation resistance of the high-voltage lithium battery module; the second circuit module is provided with an MCU unit and a power supply unit, the MCU unit is connected to the first circuit module to obtain the collected current and voltage for processing to obtain the current information, voltage information, and insulation resistance information of the high-voltage lithium battery module, and the power supply unit is connected to the high-voltage lithium battery module, the MCU unit, and the first circuit module through isolation for power supply; the third circuit module is connected to the second circuit module to transmit the current information, voltage information, and voltage information of the insulation resistance of the high-voltage lithium battery module.

2. The high-voltage lithium battery detection device for a forklift according to claim 1, wherein: The first circuit module includes a current acquisition unit, a voltage acquisition unit, an insulation resistance detection unit, and a conversion unit. The current acquisition unit and the voltage acquisition unit are connected to the high-voltage lithium battery module to respectively collect current and voltage. The insulation resistance detection unit is connected between the high-voltage lithium battery module and the housing to detect the voltage of the insulation resistance; the conversion unit is connected to the current acquisition unit, the voltage acquisition unit, and the insulation resistance detection unit to perform analog-to-digital conversion on the voltage, the current, and the voltage of the insulation resistance and then send them to the MCU unit.

3. The high-voltage lithium battery detection device for a forklift according to claim 2, characterized in that: The current acquisition unit includes a shunt and a current interface. The shunt is connected to the high-voltage lithium battery module, the current interface is connected to the shunt, and the conversion unit is provided with a first ADC chip. The first ADC chip is connected to the current interface to collect the current, perform analog-to-digital conversion, and then send it to the MCU unit.

4. The high-voltage lithium battery detection device for a forklift according to claim 2, wherein: The voltage acquisition unit includes a high-voltage voltage-dividing acquisition chip and a high-voltage interface. The high-voltage interface is connected to the high-voltage lithium battery module and a fuse. The high-voltage voltage-dividing acquisition chip is connected to the high-voltage interface to collect the total voltage, charging port voltage, discharging port voltage, and voltage at the rear end of the fuse of the high-voltage lithium battery module; the conversion unit is provided with a second ADC chip. The second ADC chip is connected to the high-voltage voltage-dividing acquisition chip to perform analog-to-digital conversion on the collected voltage and then send it to the MCU unit.

5. The high-voltage lithium battery detection device for a forklift according to claim 2, wherein: The insulation resistance detection unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a contactor KA1, a contactor KA2, a contactor KA3, a first operational amplifier chip U8, and a second operational amplifier chip U9. The resistor R1, the contactor KA1, the resistor R2, the resistor R3, the contactor KA2, and the resistor R4 are sequentially connected in series between the two ends of the high-voltage lithium battery pack. The input end of the first operational amplifier chip U8 is connected between the contact of the contactor KA1 and the resistor R2. The input end of the second operational amplifier chip U9 is connected between the contact of the contactor KA2 and the resistor R3. One contact of the contactor KA3 is connected between the resistor R2 and the resistor R3, and the other contact is connected to the housing. The MCU unit is connected to control the contactor KA1, the contactor KA2, and the contactor KA3 to be turned on or off to detect the voltage across the resistor R2 and the voltage across the resistor R3. The conversion unit is connected to the first operational amplifier chip U8 and the second operational amplifier chip U9 to perform analog-to-digital conversion and then send it to the MCU unit to calculate the insulation resistance information.

6. The high-voltage lithium battery detection device for a forklift according to claim 2, characterized in that: It further includes a digital isolation unit, and the digital isolation unit is connected between the MCU unit and the conversion unit to achieve electrical isolation.

7. The high-voltage lithium battery detection device for a forklift as described in claim 1, characterized in that: It further includes a first isolated power supply unit. The first isolated power supply unit is connected between the power supply unit and the first circuit module to achieve electrical isolation.

8. The high-voltage lithium battery detection device for a forklift according to claim 1, characterized in that: It further includes a second isolated power supply unit. The second isolated power supply unit is connected between the power supply unit and the third circuit module to achieve electrical isolation.

9. The high-voltage lithium battery detection device for a forklift according to claim 1, characterized in that: The third circuit module includes a CAN interface and an isolated CAN chip. The isolated CAN chip is connected to the MCU unit, and the CAN interface is connected to the isolated CAN chip to transmit the current information, voltage information, and insulation resistance information of the high-voltage lithium battery module to the outside.

10. The high-voltage lithium battery detection device for a forklift according to claim 1, characterized in that: The high-voltage lithium battery module is connected with a buck module. The power supply unit includes a power interface, a common-mode inductor L1, and a BUCK chip. The power interface is connected to the buck module, and the common-mode inductor L1 is connected between the power interface and the BUCK chip.

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