Multi-channel and multi-mode lithium battery charge and discharge balance management device

Abstract

The present invention relates to the field of battery management, and discloses a multi-channel and multi-mode lithium battery charge and discharge balance management device, including: a PFC rectifier circuit, an LLC circuit and multiple Buck charge and discharge regulation circuits; one side of the PFC rectifier circuit is connected to an AC power grid, and the other side is electrically connected to one side of the LLC circuit; the other side of the LLC circuit is connected to multiple independent Buck charge and discharge regulation circuits; the PFC rectifier circuit converts the AC power grid voltage into a DC high voltage; the LLC circuit isolates and converts the DC high voltage from the PFC rectifier circuit into multiple stable low-voltage DC power; the Buck charge and discharge regulation circuit converts the low-voltage DC power from the LLC circuit into the voltage required by the single cell battery to achieve its balanced supplementary charging; at the same time, the Buck charge and discharge regulation circuit can also independently make its switch tube work in the linear region to achieve its balanced discharge. The invention has the beneficial effects of: having the characteristics of electrical isolation, fast balancing speed, flexible balancing mode, continuously adjustable balancing current, strong scalability, etc.

Description

Technical Field

[0001] The present invention relates to the field of battery management, and in particular to a multi-channel and multi-mode lithium battery charge and discharge equalization management device. Background Art

[0002] The development of electric vehicles with lithium-ion batteries has become an important measure for the automotive industry to achieve sustainable development. In order to meet the requirements of mileage, driving speed and climbing ability, the voltage, power and energy level of lithium batteries are getting higher and higher, requiring a large number of single cells to be used in series and parallel groups. Due to the inconsistency of single cells, the capacity and life of battery packs used in groups are greatly reduced, increasing maintenance and replacement costs, reducing system safety, and restricting the large-scale development and promotion of electric vehicles.

[0003] To address the consistency issues of lithium battery packs, an effective method at this stage is to perform balanced maintenance and management on the single cells in the battery pack to ensure that each single cell has the ability to adjust its capacity according to its own parameter differences and needs. For example, single cells with too high capacity can reduce their capacity by discharging, and batteries with low capacity can increase their capacity by charging, thereby ensuring good consistency of the battery pack and ultimately achieving the goal of improving the performance of the entire battery pack and extending the service life of the entire battery pack.

[0004] The earliest balancing circuit adopted by the industry is to connect resistors and switches in parallel at both ends of each single battery. As long as the battery voltage is too high, the corresponding switch is closed to dissipate the energy through resistor shunt. This balancing circuit is simple and reliable, but the balancing speed and effect are limited. For this reason, capacitor-type, inductor-type, transformer-type and converter-type balancing circuits have been proposed one after another, but there are still problems such as low balancing efficiency, slow balancing speed, poor scalability and high complexity. Summary of the invention

[0005] The purpose of the present invention is to propose a multi-channel and multi-mode lithium battery charge and discharge balancing management device to solve the technical problems of low balancing efficiency, slow balancing speed, weak scalability and high complexity in traditional lithium battery charge and discharge management.

[0006] The present invention provides a multi-channel and multi-mode lithium battery charge and discharge balance management device, comprising: a PFC rectifier circuit, an LLC circuit and multiple Buck charge and discharge regulation circuits;

[0007] One side of the PFC rectifier circuit is connected to the AC grid, and the other side is electrically connected to one side of the LLC circuit;

[0008] The other side of the LLC circuit is connected to multiple independent Buck charge and discharge regulation circuits;

[0009] The PFC rectifier circuit converts the AC grid voltage into DC high voltage;

[0010] The LLC circuit isolates and transforms the high-voltage DC power from the PFC rectifier circuit into multiple stable low-voltage DC power channels;

[0011] The Buck charge and discharge regulation circuit converts the low-voltage DC power from the LLC circuit into the voltage required by the single battery to achieve balanced supplementary charging.

[0012] The beneficial effects provided by the present invention are:

[0013] By cascading a high-frequency rectifier circuit with a high-frequency multi-winding isolation converter, multiple isolated circuit channels are obtained; further, the above-mentioned isolation circuit channels are cascaded with a multi-channel non-isolated charge and discharge regulation circuit to achieve high-precision charge and discharge balancing management of multiple batteries, with fast balancing speed, flexible balancing mode, continuously adjustable charge and discharge balancing current, and strong scalability. It can quickly meet the balancing management needs of batch lithium battery packs, ensure the consistency of lithium battery packs, and effectively improve the maintenance and management efficiency of the battery pack, use capacity and extend the service life.

[0014] The balancing management device has the characteristics of electrical isolation, fast balancing speed, flexible balancing mode, continuously adjustable balancing current, and strong scalability. It has important practical significance and engineering application value for improving the consistency of lithium battery packs, increasing battery capacity and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the device of the present invention;

[0016] Figure 2 It is the working waveform of the first-stage PFC circuit in the balanced charging mode;

[0017] Figure 3 It is the working waveform of the second-stage LLC circuit in the balanced charging mode;

[0018] Figure 4 This is the working waveform of the third-level Buck charge and discharge regulation circuit in the balanced charging mode;

[0019] Figure 5 It is the main working mode diagram of the multi-channel lithium battery charge and discharge balance management device in the balanced charging mode;

[0020] Figure 6 It is the main working waveform of the third-level Buck charge and discharge regulation circuit;

[0021] Figure 7 It is the main working mode diagram of the multi-channel and multi-mode lithium battery charge and discharge balance management device in the balanced discharge mode;

[0022] Figure 8 It is a mixed mode diagram of balanced charging and balanced discharging. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Before formally describing the present invention, the scheme of the present invention is first generally described for easy understanding.

[0025] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the device of the present invention;

[0026] The present invention provides a multi-channel and multi-mode lithium battery charge and discharge balance management device, comprising:

[0027] One side of the PFC rectifier circuit is connected to the AC grid, and the other side is electrically connected to one side of the LLC circuit;

[0028] The other side of the LLC circuit is connected to multiple independent Buck charge and discharge regulation circuits;

[0029] The PFC rectifier circuit converts the AC grid voltage into DC high voltage;

[0030] The LLC circuit isolates and transforms the high-voltage DC power from the PFC rectifier circuit into multiple stable low-voltage DC power channels;

[0031] The Buck charge and discharge regulation circuit converts the low-voltage DC power from the LLC circuit into the voltage required by the single battery to achieve balanced supplementary charging.

[0032] The PFC rectifier circuit converts the AC grid voltage into DC high voltage, including the rectifier tube D R1 ~D R4 , boost inductor L1, boost switch tube S1, boost diode D1 and output filter capacitor C1;

[0033] The LLC circuit converts the high-voltage DC from the PFC rectifier circuit into multiple stable low-voltage DC, including switch tubes S2~S3, voltage-dividing capacitors C2~C3, and resonant inductor L r , isolation transformers TR1~TR4; each isolation transformer contains 1 primary winding and 6 secondary windings, and the primary and secondary windings share 1 set of magnetic cores, that is, the isolation transformer TR1 corresponds to the primary winding TR1 and the secondary winding TR 1_1 ~TR 1_6 ; Isolation transformer TR2 corresponds to primary winding TR2 and secondary winding TR 2_1 ~TR 2_6 ; Isolation transformer TR3 corresponds to primary winding TR3 and secondary winding TR 3_1 ~TR 3_6; Isolation transformer TR4 corresponds to primary winding TR4 and secondary winding TR 4_1 ~TR 4_6 It should be noted that each transformer secondary winding is followed by a rectifier circuit, including a rectifier diode D TRN_K_1 ~ D TR N_K_2 And filter capacitor C TRN_K , N=1~4, K=1~6, where N is the transformer number and K is the secondary winding number;

[0034] The Buck charge and discharge regulation circuit converts the low-voltage DC power from the LLC into the voltage required by the single battery to achieve balanced supplementary charging; at the same time, the constant current discharge of the single battery is achieved by controlling the switch tube in the linear region; each rectifier circuit after the secondary winding of the transformer corresponds to a set of Buck charge and discharge regulation circuits, including the switch tube S TRN_K_B1 ~S TR N_K_B2 、Filter inductor L TRN_K 、Filter capacitor C TRN_K_B 、Fuse FU TRN_K And anti-reverse switch tube S TRN_K_B3 , N=1~4, K=1~6, where N is the transformer number and K is the secondary winding number.

[0035] It should be noted that in the PFC rectifier circuit, the rectifier tube D R1 ~D R4 A single-phase rectifier bridge is formed, the midpoint of the rectifier bridge is connected to the two ends of the grid voltage respectively, the positive electrode of the rectifier bridge output is connected to one end of the boost inductor L1, the other end of L1 is connected to the anode of the boost diode D1 and the drain of the boost switch tube S1, the cathode of the boost diode D1 is connected to the positive electrode of the output filter capacitor C1, and the negative electrode of the rectifier bridge output is connected to the source of the boost switch tube S1 and the negative electrode of the filter capacitor C1;

[0036] It should be noted that in the LLC circuit, the drain of the switch tube S2 and the positive electrode of the voltage-dividing capacitor C2 are connected to the positive electrode of the filter capacitor C1, the source of the switch tube S3 and the negative electrode of the voltage-dividing capacitor C3 are connected to the negative electrode of the filter capacitor C1, the source of the switch tube S2 is connected to the drain of S3 and one end of the resonant inductor Lr, and the isolation transformer T R1 ~T R4 One end of the primary winding is connected to L r The other end, T R1 ~T R4 The other end of the primary winding is connected to the negative pole of C2 and the positive pole of C3; the isolation transformer T R1 ~T R4There are 6 independent windings corresponding to the secondary side, a total of 24 windings. Behind each winding is a rectifier circuit with exactly the same circuit connection relationship. Specifically, the secondary winding is a center-tapped winding, corresponding to the upper, middle and lower connection terminals, of which the upper terminal is connected to D TRN_K_1 The cathode of the TRN_K_2 The cathode of the middle port is connected to the rectifier filter capacitor C TRN_K The positive electrode, D TRN_K_1 The anode and D TRN_K_2 The anodes are connected together to C TRN_K The negative pole; N = 1 ~ 4, K = 1 ~ 6, where N is the transformer number and K is the secondary winding number;

[0037] It should be noted that the rectifier circuit behind the secondary winding is cascaded with an independent Buck charge and discharge regulation circuit. Each set of Buck charge and discharge regulation circuits is exactly the same, specifically the switch tube S TRN_K_B1 The drain is connected to the above rectifier filter capacitor C TRN_K The positive electrode of the switch tube S TRN_K_B1 The source and switch tube S TRN_K_B2 The drain of the filter is connected to the filter inductor L TRN_K One end, L TRN_K The other end is connected to the output filter capacitor C TRN_K_B The positive pole and fuse FU TRN_K One end of the switch tube S TRN_K_B2 The source of each TRN_K and C TRN_K_B The negative electrode of the switch tube S TRN_K_B3 The source of the fuse FU TRN_K The other end is connected to the positive terminal of the single battery, S TRN_K_B3 The drain of the transformer is connected to the negative terminal of the single battery, where N = 1~4, K = 1~6, N is the transformer number, and K is the secondary winding number;

[0038] Among them, the isolation transformer T R1 ~T R4 They are independent transformers, each of which includes 1 primary winding and 6 secondary windings, and the primary and secondary windings share a magnetic core;

[0039] Among them, the output voltage of the PFC circuit is closed-loop controlled, which realizes high power factor correction of the input current tracking the grid voltage while ensuring the constant voltage output of the output voltage; the LLC circuit works in a fixed-frequency open-loop control at the resonance point, isolating and converting the stable output voltage of the PFC into a relatively stable low-voltage DC power, with simple control and high efficiency;

[0040] Among them, the Buck charge and discharge regulation circuit has two working modes, namely balanced charge mode and balanced discharge mode; when working in balanced charge mode, S TRN_K_B2 Normally closed, according to the required current instruction, through the switch tube S TRN_K_B1 PWM control and S TRN_K_B2 The body diode of the inductor automatically continues to flow, realizing constant current control of the inductor current, and then realizing balanced supplementary constant current charging of the single battery; when working in the balanced discharge mode, the switch tube S TRN_K_B1 Normally closed, adjust S according to the required current command TR N_K_B2 The G-pole voltage value makes it work in the linear region, realizing balanced constant current discharge of single cells;

[0041] Among them, the fuse FU TRN_K Used for battery isolation protection and fault isolation, switch tube S TRN_K_B3 Used to prevent battery polarity from being reversed and to reduce losses during normal balancing operation; when the battery polarity is detected to be normal, S TRN_K_B3 Work is normal.

[0042] Figure 2-Figure 5 FIG. 2 is a diagram showing the main working waveforms of the embodiment of the present invention working in the balanced charging mode, wherein Figure 2 It is the working waveform of the first-stage PFC circuit in the balanced charging mode. From top to bottom, the waveforms are the grid voltage V g , the current I of the input inductor L1 L1 、C1 capacitor bus voltage V bus And the switch tube S1 drive signal V gs_S1 It can be seen that the switch tube S1 is PWM controlled. By controlling its on and off, the current waveform of the inductor L1 tracks the AC220V grid voltage, ensuring that the power factor is close to 1. At the same time, the voltage on the capacitor C1 is stabilized, providing a stable DC input voltage for the subsequent LLC circuit.

[0043] Figure 3 This is the working waveform of the second-stage LLC circuit in the balanced charging mode. From top to bottom, the waveforms are respectively the switch tube S2 drive signal V gs_S2 , switch tube S3 drive signal V gs_S3 , bridge arm midpoint voltage V ab , magnetizing inductor current I Lm , resonant inductor L r Current I Lr , secondary side rectifier diode current ID TRN_K_1 and ID TRN_K_2It can be seen that the switch tubes S2 and S3 work at a fixed switching frequency and pulse width, and the two switch tubes are complementary to each other to achieve the LLC's fixed-frequency high-efficiency soft switching control and isolated step-down conversion, providing a stable DC input voltage for the subsequent Buck charge and discharge regulation circuit to work in the balanced charging mode.

[0044] Figure 4 This is the working waveform of the third-level Buck charge and discharge regulation circuit in the balanced charging mode. From top to bottom, the waveforms are the inductor current I_L TRN_K , switch tube S TRN_K_B1 The driving control signal V gs _ STRN_K_B1 and S TRN_K_B2 The driving control signal V gs_STRN_K_B2 , it can be seen that S TRN_K_B2 Normally closed, through the switch tube S TRN_K_B1 PWM control, and S TRN_K_B2 The body diode of the inductor automatically continues current to realize constant current control of the inductor current, thereby realizing constant current supplementary charging of the single battery.

[0045] Figure 5 This is the main working mode diagram of the multi-channel lithium battery charge and discharge balance management device in the balanced charging mode, in which the PFC circuit S1 is turned on, the input inductor stores energy; the LLC circuit S2 is turned on, S3 is turned off, the bridge arm positive half wave is turned on, and the secondary side rectifier diode D TRN_K_1 On; Buck charge and discharge regulation circuit switch tube S TRN_K_B1 On, S TRN_K_B2 is turned off, and the inductor current increases.

[0046] Figure 6-7 It is the main working waveform of the embodiment of the present invention working in the balanced discharge mode; in this mode, the first-stage PFC circuit stops working in the balanced charging mode, that is, the switch tube S1 is normally off; the second-stage LLC circuit stops working, that is, the switch tubes S2 and S3 are normally off; the third-stage Buck charge and discharge regulation circuit works, and the switch tube S TRN_K_B1 Normally closed, adjust S according to the required current command TR N_K_B2 The G pole voltage value V gs_STRN_K_B2 Make it work in the linear region to achieve balanced constant current discharge of single cells, such as Figure 6 and Figure 7 As shown; the switch tube S TRN_K_B3 After judging that the polarity is correct, it will always be on;

[0047] It should be noted that Figure 2-Figure 7The balanced charging and balanced discharging modes shown can be performed simultaneously, for balanced charging of low-capacity single cells and balanced discharging of high-capacity single cells. Each channel can set the balanced mode separately to further improve the balanced efficiency and ensure battery consistency through fast balanced operation.

[0048] Figure 8 A mixed mode modal diagram of balanced charging and balanced discharging of this embodiment is given, in which LT1-LT12 single cells are balanced charged; LT13-LT24 single cells are balanced discharged; the working principles of balanced charging and balanced discharging are respectively as follows Figure 2-Figure 7 The same as shown;

[0049] The parameters in the embodiment of the present invention are as follows: Input voltage V g =220VAC / 50Hz; bus voltage V bus =360VDC; PFC inductor L1=1mH; bus capacitor C1=680uF; LLC resonant secondary rectifier output voltage V CTRN_K =10V; resonant capacitor C2=C3=66nF; resonant inductor L r =10µH; Transformer primary-to-secondary ratio 20:1:1; Secondary rectifier filter capacitor C TRN_K =220µF; Buck circuit filter inductor L TR =22uH; Buck output filter capacitor C TRN_K_B =470µF; switch tubes S1, S2, S3, S TR N_K_B1 , S TR N_K_B2 , S TR N_K_B3 All are MOSFET; rectifier diode D R1 ~ D R4 , D1, D TRN_K_1 , D TRN_K_2 All are fast recovery diodes; LT1~LT24 are single lithium batteries with a range of 2V~5V.

[0050] The advantages of the multi-channel and multi-mode lithium battery charge and discharge balance management device of the present invention are:

[0051] (1) Fast balancing speed;

[0052] (2) The balancing mode is flexible, and the balancing charging and discharging modes can be selected independently;

[0053] (3) The charge and discharge balancing current can be adjusted in a closed loop, which is continuously adjustable and has high precision;

[0054] (4) Strong scalability, standardization, and modularity, which can quickly meet the balanced management needs of batch lithium battery packs;

[0055] (5) Effectively solve the consistency problem of lithium battery packs, improve battery capacity and extend battery life.

[0056] The beneficial effects of the present invention are:

[0057] By cascading a high-frequency rectifier circuit with a high-frequency multi-winding isolation converter, multiple isolated circuit channels are obtained; further, the above-mentioned isolation circuit channels are cascaded with a multi-channel non-isolated charge and discharge regulation circuit to achieve high-precision charge and discharge balancing management of multiple batteries, with fast balancing speed, flexible balancing mode, continuously adjustable charge and discharge balancing current, and strong scalability. It can quickly meet the balancing management needs of batch lithium battery packs, ensure the consistency of lithium battery packs, and effectively improve the maintenance and management efficiency of the battery pack, use capacity and extend the service life.

[0058] The balancing management device has the characteristics of electrical isolation, fast balancing speed, flexible balancing mode, continuously adjustable balancing current, and strong scalability. It has important practical significance and engineering application value for improving the consistency of lithium battery packs, increasing battery capacity and extending service life.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-channel and multi-mode lithium battery charge and discharge balance management device, characterized in that: include: PFC rectifier circuit, LLC circuit and multiple Buck charge and discharge regulation circuits; One side of the PFC rectifier circuit is connected to the AC grid, and the other side is electrically connected to one side of the LLC circuit; The other side of the LLC circuit is connected to multiple independent Buck charge and discharge regulation circuits; The PFC rectifier circuit converts the AC grid voltage into DC high voltage; The LLC circuit isolates and transforms the high-voltage DC power from the PFC rectifier circuit into multiple stable low-voltage DC power channels; The Buck charge and discharge regulation circuit converts the low-voltage DC power from the LLC circuit into the voltage required by the single battery to achieve balanced supplementary charging; LLC circuit includes: switch tube S2~S3, voltage divider capacitor C2~C3, resonant inductor L r , Isolation transformers TR1~TR4; Each isolation transformer contains one primary winding and six secondary windings, and the primary and secondary windings share one set of magnetic cores; each transformer secondary winding is followed by a set of rectifier circuits, including a rectifier diode D TRN_K_1 ~ D TRN_K_2 And filter capacitor C TRN_K , N=1~4, K=1~6, where N is the transformer number and K is the secondary winding number; The drain of the switch tube S2 and the positive electrode of the voltage-dividing capacitor C2 are connected to the positive electrode of the filter capacitor C1, the source of the switch tube S3 and the negative electrode of the voltage-dividing capacitor C3 are connected to the negative electrode of the filter capacitor C1, the source of the switch tube S2 is connected to the drain of S3 and one end of the resonant inductor Lr, and the isolation transformer T R1 ~T R4 One end of the primary winding is connected to L r The other end, T R1 ~T R4 The other end of the primary winding is connected to the negative pole of C2 and the positive pole of C3; the isolation transformer T R1 ~T R4 There are 6 independent windings corresponding to the secondary side, a total of 24 windings. Behind each winding is a rectifier circuit with exactly the same circuit connection relationship. Specifically, the secondary winding is a center-tapped winding, corresponding to the upper, middle and lower connection terminals, of which the upper terminal is connected to D TRN_K_1 The cathode of the TRN_K_2 The cathode of the middle port is connected to the rectifier filter capacitor C TRN_K The positive electrode, D TRN_K_1 The anode and D TRN_K_2 The anodes are connected together to C TRN_K of the negative electrode.

2. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 1, characterized in that: The PFC rectifier circuit includes a rectifier tube D R1 ~D R4 , boost inductor L1, boost switch tube S1, boost diode D1 and output filter capacitor C1.

3. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 2, characterized in that: Rectifier D R1 ~D R4 A single-phase rectifier bridge is formed, the midpoint of the rectifier bridge is connected to the two ends of the AC grid voltage, the positive electrode of the rectifier bridge output is connected to one end of the boost inductor L1, the other end of the inductor L1 is connected to the anode of the boost diode D1 and the drain of the boost switch tube S1, the cathode of the boost diode D1 is connected to the positive electrode of the output filter capacitor C1, and the negative electrode of the rectifier bridge output is connected to the source of the boost switch tube S1 and the negative electrode of the filter capacitor C1.

4. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 1, characterized in that: Buck charge and discharge regulation circuit includes: switch tube S TRN_K_B1 ~S TR N_K_B2 , filter inductor L TRN_K 、Filter capacitor C TRN_K_B 、Fuse FU TRN_K And anti-reverse switch tube S TRN_K_B3 , N=1~4, K=1~6, where N is the transformer number and K is the secondary winding number.

5. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 4, characterized in that: Switching tube S TRN_K_B1 The drain is connected to the above filter capacitor C TRN_K_B The positive electrode of the switch tube S TRN_K_B1 The source and switch tube S TRN_K_B2 The drain of the filter is connected to the filter inductor L TRN_K One end, L TRN_K The other end is connected to the output filter capacitor C TRN_K_B The positive pole and fuse FU TRN_K One end of the switch tube S TRN_K_B2 The source of each TRN_K and C TRN_K_B The negative electrode of the switch tube S TRN_K_B3 The source of the fuse FU TRN_K The other end is connected to the positive terminal of the single battery, S TRN_K_B3 The drain terminal is connected to the negative terminal of the single cell.

6. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 1, characterized in that: The output voltage of the PFC circuit is closed-loop controlled, and the LLC circuit operates in fixed-frequency open-loop control at the resonance point.

7. A multi-channel and multi-mode lithium battery charge and discharge balance management device as claimed in claim 5, characterized in that: Buck charge and discharge regulation circuit has two working modes, namely balanced charge mode and balanced discharge mode. When working in balanced charge mode, S TRN_K_B2 Normally closed, according to the required current instruction, through the switch tube S TRN_K_B1 PWM control and S TRN_K_B2 The body diode of the inductor automatically continues to flow, realizing constant current control of the inductor current, and then realizing balanced supplementary constant current charging of the single battery; when working in the balanced discharge mode, the switch tube S TRN_K_B1 Normally closed, adjust S according to the required current command TR N_K_B2 The G-pole voltage value makes it work in the linear region, realizing balanced constant current discharge of single cells; Among them, the fuse FU TRN_K Used for battery isolation protection and fault isolation, switch tube S TRN_K_B3 Used to prevent battery polarity from being reversed and to reduce losses during normal balancing operation; when the battery polarity is detected to be normal, S TRN_K_B3 Work is normal.

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