Novel three-terminal fuse control circuit

Abstract

The utility model discloses a novel three-terminal fuse control circuit, and belongs to the technical field of fuse control circuits. The novel three-terminal fuse control circuit comprises an optocoupler U4, an MOS tube Q16, a slide wire resistor R79, a slide wire resistor R80, a slide wire resistor R78, a capacitor C70, a slide wire resistor R77, a slide wire resistor R74, an MOS tube Q15, a slide wire resistor R73, a slide wire resistor R75, a slide wire resistor R72, a capacitor C69, a voltage-regulator tube ZD5 and a transient suppression diode D4. The embodiment of the utility model has the beneficial effects that a short-circuit point is cancelled, and welding is not needed after the battery is assembled. And the three-end fuse is prevented from being mistakenly triggered and damaged due to the fact that peak voltage generated by load operation is connected into a single cell in series. And the three-end fuse is prevented from being mistakenly triggered and damaged due to wire breakage protection caused by loosening of the flat cable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fuse control circuit, specifically relates to a novel three -terminal fuse control circuit. BACKGROUND

[0002] At present, most of the batteries needing CBUL authentication on the market adopt three-terminal fuses, and the three-terminal fuses can be burnt out when the primary charging protection MOS fails, so that multiple charging protections are achieved. The practice in the industry is that the second charging protection IC detects the voltage of each section, then the MOS controls the three-terminal fuse, and a shorting point is additionally arranged between the fuse and the control electrode of the MOS, and the shorting point is short-circuited after the battery is assembled and tested, so that the fuse can be burnt out due to the high voltage detected by the secondary protection IC during assembly. But this limitation is great, there cannot be components around the shorting point, the shorting point welding needs a good ground of soldering iron, and the staff operation may cause tin beads to fall on the board, etc. leading to PCB short circuit, and if the battery signal cable is loose, it will cause the voltage of one section to be high, and the secondary protection IC will be damaged. SUMMARY

[0003] The embodiment of the utility model aims at providing a novel three-terminal fuse control circuit, which can solve at least one technical problem involved in the background art.

[0004] In order to solve the above technical problems, the utility model is implemented as follows:

[0005] The utility model discloses an embodiment of a novel three-terminal fuse control circuit, one end of which is connected to a load positive pole P+, one end of which is connected to a battery total positive pole B+, and one end of which is connected to an MCU, for cutting off the loop between the battery total positive pole B+ and the load positive pole P+ when the voltage and current are abnormal, the novel three-terminal fuse control circuit comprising an optocoupler U4, a MOS tube Q16, a slide wire resistance R79, a slide wire resistance R80, a slide wire resistance R78, a capacitor C70, a slide wire resistance R77, a slide wire resistance R74, a MOS tube Q15, a slide wire resistance R73, a slide wire resistance R75, a slide wire resistance R72, a capacitor C69, a voltage stabilizing tube ZD5 and a transient suppression diode D4, the 1st pin of the optocoupler U4 being connected to the FUSE-EN pin of the MCU, the 2nd pin being grounded, the 3rd pin being connected to the gate of the MOS tube Q16, and the 4th pin being connected to the load positive pole P+, the slide wire resistance R79 and the slide wire resistance R80 being connected in series between the 1st pin of the optocoupler U4 and the FUSE-EN pin of the MCU, the slide wire resistance R78 and the capacitor C70 being connected in parallel, one end of each being connected to the 2nd pin of the optocoupler U4, and the other end being connected between the slide wire resistance R79 and the slide wire resistance R80, the slide wire resistance R77 being connected in series between the 3rd pin of the optocoupler U4 and the gate of the MOS tube Q16, one end of the slide wire resistance R74 being connected between the slide wire resistance R77 and the gate of the MOS tube Q16, and the other end being connected to the drain of the MOS tube Q15, one end of the slide wire resistance R73 being connected to the gate of the MOS tube Q15, and the other end being connected to the FUSE-DN pin of the MCU, the source of the MOS tube Q15 being grounded, one end of the slide wire resistance R72 being connected to the source of the MOS tube Q15, and the other end being connected between the gate of the MOS tube Q15 and the slide wire resistance R73, the drain of the MOS tube Q16 being connected to the battery total positive pole B+ through a three-terminal fuse, and the source being grounded, the slide wire resistance R75, the capacitor C69 and the voltage stabilizing tube ZD5 being connected in parallel, one end of each being connected to the gate of the MOS tube Q16, and the other end being connected to the source of the MOS tube Q16, one end of the transient suppression diode D4 being connected to the drain of the MOS tube Q16, and the other end being connected to the source of the MOS tube Q16.

[0006] Optionally, the resistance value of the slide wire resistance R79 is 1K ohm, the resistance value of the slide wire resistance R80 is 1K ohm, the resistance value of the slide wire resistance R78 is 100K ohm, the resistance value of the slide wire resistance R77 is 47K ohm, the resistance value of the slide wire resistance R74 is 100R ohm, the resistance value of the slide wire resistance R73 is 1K ohm, the resistance value of the slide wire resistance R75 is 470K ohm, and the resistance value of the slide wire resistance R72 is 1M ohm.

[0007] Optionally, the capacitance value of the capacitor C70 is 100NF, and the capacitance value of the capacitor C69 is 10NF.

[0008] Optionally, the voltage stabilizing voltage of the voltage stabilizing tube ZD5 is 15V.

[0009] Optionally, the transient suppression diode D4 is SMF70CA type transient suppression diode.

[0010] Optionally, the MOS tube Q16 is PJM10H03NSC type MOS tube.

[0011] Optionally, the three-terminal fuse is WPF30A10K type three-terminal fuse.

[0012] The embodiment of the utility model has the advantages that:

[0013] 1. The short-circuit point is cancelled, and the battery does not need to be reassembled and welded.

[0014] 2. The sharp peak voltage generated by the load operation is avoided from being introduced into the single battery cell to cause the false triggering of the three-terminal fuse and damage.

[0015] 3. The disconnection protection caused by the loose wire is avoided to cause the false triggering of the three-terminal fuse and damage. DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, wherein:

[0017] Figure 1 The application circuit diagram of the novel three-terminal fuse control circuit is provided for the utility model;

[0018] Figure 2 The circuit diagram of the novel three-terminal fuse control circuit is provided for the utility model;

[0019] Figure 3 The circuit diagram of the analog front end is provided for the utility model;

[0020] Figure 4 The circuit diagram of the two-stage protection circuit is provided for the utility model;

[0021] Figure 5 The circuit diagram of the MCU is provided for the utility model. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0023] The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind and are not limited in number, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0024] Please refer to Figure 1 As shown in the application circuit diagram of the novel three-terminal fuse control circuit provided by the present application, it can be seen that the novel three-terminal fuse control circuit provided by the present application is connected to the load positive pole P+, the battery total positive pole B+ and the MCU, and is used to cut off the loop between the battery total positive pole B+ and the load positive pole P+ when the voltage and current are abnormal, so as to cut off the charging and discharging loop and play a role in protecting the battery.

[0025] In combination with Figure 2 As shown in the novel three-terminal fuse control circuit provided by the present application, the novel three-terminal fuse control circuit comprises an optocoupler U4, a MOS tube Q16, a slide wire resistance R79, a slide wire resistance R80, a slide wire resistance R78, a capacitor C70, a slide wire resistance R77, a slide wire resistance R74, a MOS tube Q15, a slide wire resistance R73, a slide wire resistance R75, a slide wire resistance R72, a capacitor C69, a voltage stabilizing tube ZD5 and a transient suppression diode D4.

[0026] The 1 pin of the optocoupler U4 is connected to the FUSE-EN pin of the MCU, the 2 pin is grounded, the 3 pin is connected to the gate of the MOS tube Q16, and the 4 pin is connected to the load positive pole P+.

[0027] The slide wire resistance R79 and the slide wire resistance R80 are connected in series between the 1 pin of the optocoupler U4 and the FUSE-EN pin of the MCU.

[0028] The slide wire resistance R78 and the capacitor C70 are connected in parallel, and are respectively connected to the 2 pin of the optocoupler U4 at one end and connected between the slide wire resistance R79 and the slide wire resistance R80 at the other end.

[0029] The slide wire resistance R77 is connected in series between the 3-pin of the photo-coupler U4 and the gate of the MOS Q16.

[0030] One end of the slide wire resistance R74 is connected between the slide wire resistance R77 and the gate of the MOS Q16, and the other end is connected to the drain of the MOS Q15.

[0031] One end of the slide wire resistance R73 is connected to the gate of the MOS Q15, and the other end is connected to the FUSE-DN pin of the MCU.

[0032] The source of the MOS Q15 is grounded.

[0033] One end of the slide wire resistance R72 is connected to the source of the MOS Q15, and the other end is connected between the gate of the MOS Q15 and the slide wire resistance R73.

[0034] The drain of the MOS Q16 is connected to the total positive pole B+ of the battery through the three-terminal fuse, and the source is grounded.

[0035] The slide wire resistance R75, the capacitor C69, and the voltage stabilizing tube ZD5 are connected in parallel, and one end of each is connected to the gate of the MOS Q16, and the other end is connected to the source of the MOS Q16.

[0036] One end of the transient suppression diode D4 is connected to the drain of the MOS Q16, and the other end is connected to the source of the MOS Q16.

[0037] In a specific embodiment, the resistance value of the slide wire resistance R79 is 1K ohm, the resistance value of the slide wire resistance R80 is 1K ohm, the resistance value of the slide wire resistance R78 is 100K ohm, the resistance value of the slide wire resistance R77 is 47K ohm, the resistance value of the slide wire resistance R74 is 100R ohm, the resistance value of the slide wire resistance R73 is 1K ohm, the resistance value of the slide wire resistance R75 is 470K ohm, and the resistance value of the slide wire resistance R72 is 1M ohm. The capacitance value of the capacitor C70 is 100NF, and the capacitance value of the capacitor C69 is 10NF.

[0038] The voltage stabilizing voltage of the voltage stabilizing tube ZD5 is 15V.

[0039] The transient suppression diode D4 is an SMF70CA type transient suppression diode.

[0040] The MOS Q16 is a PJM10H03NSC type MOS.

[0041] The three-terminal fuse is a WPF30A10K type three-terminal fuse.

[0042] The MCU is a N32G453CCL7 type MCU of the National Technology.

[0043] Referring to Fig. 4, the chip U42 used by the analog front end is a DVC1114 chip. Figure 3 The analog front end is used to collect the voltage and current of the battery cell, and performs functions such as charge-discharge MOS control and temperature protection. The current is collected through the sampling resistor RS3 between the negative terminal of the positive electrode B- and the negative electrode P- of the load. The 37th pin and the 38th pin of the chip U42 are I2C communication lines SDA and SCL, which are connected to the 14th pin and the 15th pin of the MCU for communication with the MCU and transmission of real-time data.

[0044] Referring to Fig. 4, the chip U42 used by the analog front end is a DVC1114 chip. Figure 4 Referring to Fig. 4, the chip U39, U40 and U41 of the secondary protection circuit are all CW1051 chips of Simei. The secondary protection circuit collects the real-time voltage of the battery cell through the B1-B13 pins. When the voltage is below the protection voltage, the 8th pin of the chip is at low level. The PF-FAULT pin is pulled up by VDD-MCUA and sent to the MCU. If any one of the battery cells reaches the protection voltage value, the 8th pin voltage becomes high. The PF-FAULT pin is pulled down by the transistor Q14.

[0045] Referring to Fig. 4, the chip U39, U40 and U41 of the secondary protection circuit are all CW1051 chips of Simei. The secondary protection circuit collects the real-time voltage of the battery cell through the B1-B13 pins. When the voltage is below the protection voltage, the 8th pin of the chip is at low level. The PF-FAULT pin is pulled up by VDD-MCUA and sent to the MCU. If any one of the battery cells reaches the protection voltage value, the 8th pin voltage becomes high. The PF-FAULT pin is pulled down by the transistor Q14. Figure 5 Referring to Fig. 4, the 14th pin and the 15th pin of the MCU are SDA and SCL, and the I2C communication line of the analog front end is used to receive the voltage and current signals of the analog front end. The 5th pin is used to receive the control signal of the secondary protection circuit. The 25th pin is a three-terminal fuse anti-misoperation trigger control signal. The 26th pin is a control signal output.

[0046] The working principle of the novel three-terminal fuse control circuit provided by the utility model is as follows:

[0047] When the secondary protection circuit detects an abnormally high voltage, PF-FAULT becomes low, and the signal is connected to the 26th pin of the MCU. When the MCU detects that the analog front end has a charging current (sampling resistor between B- and P-), the 26th pin of the MCU outputs high if the above two conditions are met, and the three-terminal fuse is blown. If a signal line is broken, causing one of the voltages to be abnormally high. The PF-FAULT output of the secondary protection circuit is low voltage to the 2nd pin of the MCU. The MCU detects the current of the analog front end through I2C, and if no charging current is detected, it is considered that there is no charging abnormality, fuse-EN is low, and the three-terminal fuse blowing mechanism is not triggered; FUSE-DN is high, and the light coupling leakage current is pulled down.

[0048] It is to be understood that the terminology "including", "comprising", or any other variation thereof, is intended to cover a non-exclusive inclusion such that process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0049] Furthermore, it is to be understood that the scope of the present application is not limited to the order of execution of the functions illustrated or discussed, but can also include execution of the functions in a substantially simultaneous manner or in the reverse order, for example, the described methods can be executed in an order different from that described, and various steps can be added, omitted, or combined. In addition, features described with reference to certain examples can be combined in other examples.

[0050] The embodiments of the present application are described above with reference to the drawings; however, the present application is not limited to the specific embodiments described above, but the specific embodiments described above are merely illustrative, and are not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope of protection of the claims, and all belong to the protection of the present application.

Claims

1. A novel three-terminal fuse control circuit, characterized by, One end of the load positive pole P+ is connected to the battery total positive pole B+, one end of the MCU is connected to the battery total positive pole B+, and is used for cutting off the loop between the battery total positive pole B+ and the load positive pole P+ when the voltage and current are abnormal; the novel three-terminal fuse control circuit comprises an optical coupler U4, a MOS tube Q16, a slide wire resistance R79, a slide wire resistance R80, a slide wire resistance R78, a capacitor C70, a slide wire resistance R77, a slide wire resistance R74, a MOS tube Q15, a slide wire resistance R73, a slide wire resistance R75, a slide wire resistance R72, a capacitor C69, a voltage stabilizing tube ZD5 and a transient suppression diode D4; the 1st pin of the optical coupler U4 is connected to the FUSE-EN pin of the MCU, and the 2nd pin is grounded; the 3rd pin is connected to the gate of the MOS tube Q16, and the 4th pin is connected to the load positive pole P+; the slide wire resistance R79 and the slide wire resistance R80 are connected in series between the 1st pin of the optical coupler U4 and the FUSE-EN pin of the MCU; the slide wire resistance R78 and the capacitor C70 are connected in parallel, and one end of each is connected to the 2nd pin of the optical coupler U4, and the other end is connected between the slide wire resistance R79 and the slide wire resistance R80; the slide wire resistance R77 is connected in series between the 3rd pin of the optical coupler U4 and the gate of the MOS tube Q16; one end of the slide wire resistance R74 is connected between the slide wire resistance R77 and the gate of the MOS tube Q16, and the other end is connected to the drain of the MOS tube Q15; one end of the slide wire resistance R73 is connected to the gate of the MOS tube Q15, and the other end is connected to the FUSE-DN pin of the MCU; the source of the MOS tube Q15 is grounded; one end of the slide wire resistance R72 is connected to the source of the MOS tube Q15, and the other end is connected between the gate of the MOS tube Q15 and the slide wire resistance R73; the drain of the MOS tube Q16 is connected to the battery total positive pole B+ through the three-terminal fuse, and the source is grounded; the slide wire resistance R75, the capacitor C69 and the voltage stabilizing tube ZD5 are connected in parallel, and one end of each is connected to the gate of the MOS tube Q16, and the other end is connected to the source of the MOS tube Q16; one end of the transient suppression diode D4 is connected to the drain of the MOS tube Q16, and the other end is connected to the source of the MOS tube Q16.

2. The novel three terminal fuse control circuit according to claim 1, wherein, The resistance value of the slide wire resistance R79 is 1K ohm, the resistance value of the slide wire resistance R80 is 1K ohm, the resistance value of the slide wire resistance R78 is 100K ohm, the resistance value of the slide wire resistance R77 is 47K ohm, the resistance value of the slide wire resistance R74 is 100R ohm, the resistance value of the slide wire resistance R73 is 1K ohm, the resistance value of the slide wire resistance R75 is 470K ohm, and the resistance value of the slide wire resistance R72 is 1M ohm.

3. The novel three terminal fuse control circuit according to claim 2, wherein, The capacitance value of the capacitor C70 is 100NF, and the capacitance value of the capacitor C69 is 10NF.

4. The novel three-terminal fuse control circuit according to claim 3, characterized in that The voltage stabilizing voltage of the voltage stabilizing tube ZD5 is 15V.

5. The novel three terminal fuse control circuit according to claim 4, wherein, The transient suppression diode D4 is an SMF70CA type transient suppression diode.

6. The novel three terminal fuse control circuit according to claim 5, wherein, The MOS tube Q16 is a PJM10H03NSC type MOS tube.

7. The novel three terminal fuse control circuit according to claim 1, wherein, The three-terminal fuse is a WPF30A10K type three-terminal fuse.

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