Novel high-voltage charging forbidding circuit

Abstract

The utility model discloses a novel high-voltage charging forbidding circuit, and belongs to the technical field of lithium battery charging. The circuit comprises a triode U10, a triode Q6, a resistor R56, a resistor R65, a voltage-regulator tube DZ7, a resistor R70, a capacitor C42, a resistor R57, a resistor R58, a triode Q4, a resistor R64, a diode D14, a resistor R98, a resistor R97, a triode U5, a resistor R29, an MOS charging switch QA1, a resistor R52, a voltage-regulator diode D7, a capacitor C36 and a capacitor C37. The beneficial effects of the embodiment of the utility model are that the charging MOS switch can be controlled through the triode and the voltage-regulator tube; the anti-static property and the stability are improved; a pure hardware scheme is adopted, so that the problem of circuit abnormity caused by software BUG is avoided; the structure is simple, the used components are few, and the cost can be saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery charging technical field, concretely relates to a novel high voltage prohibits charging circuit. BACKGROUND

[0002] Lithium battery charging has very strict charging voltage requirement, if exceeds its highest voltage will lead to battery bulging, serious even explosion, aiming at this kind of situation, lithium battery must increase protection circuit to control charging voltage not to exceed the highest voltage. Charger must also strictly control its charging voltage cannot exceed the highest voltage of lithium battery. Otherwise use high voltage charger to charge normal charger can lead to lithium battery protection board failure to charge the battery and bulge or explosion danger.

[0003] In order to prevent user to take wrong charger charging, market majority uses singlechip to identify charger voltage, if voltage is within the safety range then opens charging switch circuit and charges the battery, if voltage exceeds the safety voltage, then closes charging switch circuit and does not allow to charge the battery. But the singlechip of this kind of circuit needs to increase mos pipe additionally, controls MOS pipe by singlechip, thus increases the cost of singlechip and MOS pipe, and singlechip withstand voltage is low, is easy to cause unstable or damage due to static or external interference. UTILITY MODEL CONTENTS

[0004] The embodiment of the utility model aims at providing a novel high voltage prohibits charging circuit, which can solve at least one technical problem involved in the background art.

[0005] In order to solve the above technical problem, the utility model is implemented as follows:

[0006] The utility model discloses an embodiment of novel high -voltage prohibits charging circuit, including triode U10, triode Q6, resistance R56, resistance R65, stabilivolt pipe DZ7, resistance R70, electric capacity C42, resistance R57, resistance R58, triode Q4, resistance R64, diode D14, resistance R98, resistance R97, triode U5, resistance R29, MOS charges switch QA1, resistance R52, stabilivolt diode D7, electric capacity C36 and electric capacity C37, the emitter of triode U10 is connected with charger input C+, and the base is connected with the collector of triode Q6, and the collector is connected with the base of triode Q4, the emitter of triode Q6 is connected with the emitter of triode U10, and the base is connected with the negative pole of stabilivolt pipe DZ7, one end of resistance R56 is connected between the emitter of triode U10 and the emitter of triode Q6, and the other end is connected between the base of triode U10 and the collector of triode Q6, one end of resistance R57 is connected between the emitter of triode U10 and the emitter of triode Q6, and the other end is grounded, one end of resistance R65 is connected with the emitter of triode Q6, and the other end is connected with the base of triode Q6, one end of resistance R70 is connected with the positive pole of stabilivolt pipe DZ7, and the other end is grounded, one end of electric capacity C42 is connected with the negative pole of stabilivolt pipe DZ7, and the other end is connected with the positive pole of stabilivolt pipe DZ7, resistance R58 is connected between the collector of triode U10 and the base of triode Q4, one end of resistance R64 is connected with the base of triode Q4, and the other end is grounded, the emitter of triode Q4 is grounded, and the collector is connected with the negative pole of diode D14, the positive pole of diode D14 is connected with the base of triode U5, resistance R98 is connected between the positive pole of diode D14 and the base of triode U5, resistance R97 is connected between the base and the emitter of triode U5, the emitter of triode U5 is connected with IC chip, and the collector is connected with the gate of MOS charges switch QA1, resistance R29 is connected between the collector of triode U5 and the gate of MOS charges switch QA1, the source of MOS charges switch QA1 is connected with charger input C-, and the drain is connected with IC chip, electric capacity C36 and electric capacity C37 are connected between the source and the drain of MOS charges switch QA1, resistance R52 is connected between the gate and the source of MOS charges switch QA1, the negative pole of stabilivolt diode D7 is connected with the gate of MOS charges switch QA1, and the positive pole is connected with the source of MOS charges switch QA1.

[0007] Optionally, the charger input C+ and the charger input C- are connected to a 42V voltage.

[0008] Optionally, the resistance value of the resistor R56 is 3K ohms; the resistance value of the resistor R57 is 100K ohms; the resistance value of the resistor R65 is 100K ohms; the resistance value of the resistor R70 is 100K ohms; the resistance value of the resistor R58 is 3K ohms; the resistance value of the resistor R64 is 1M ohms; the resistance value of the resistor R98 is 3M ohms; the resistance value of the resistor R97 is 1M ohms; the resistance value of the resistor R29 is 20K ohms; and the resistance value of the resistor R52 is 100K ohms.

[0009] Optionally, the voltage stabilizing tube DZ7 is a 42V voltage stabilizing tube.

[0010] Optionally, the IC chip is an SH3676010B type chip.

[0011] Optionally, the voltage stabilizing tube DZ7 is a BZT52C type voltage stabilizing tube.

[0012] Optionally, the voltage stabilizing diode D7 is an LM3Z15VT1G type diode.

[0013] The embodiment of the utility model has the advantages that:

[0014] 1. The charging MOS switch can be controlled by the triode and the voltage stabilizing tube.

[0015] 2. The static electricity prevention and stability are improved.

[0016] 3. The pure hardware scheme is adopted, so that the circuit abnormality caused by the software bug is avoided.

[0017] 4. The structure is simple, the components are few, and the cost can be saved. DRAWINGS

[0018] In order to make the technical scheme in the embodiment of the utility model clearer, the drawings used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0019] Figure 1 The utility model provides a lithium battery charging circuit diagram;

[0020] Figure 2 The utility model provides a novel high-voltage prohibition charging circuit diagram. DETAILED DESCRIPTION

[0021] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] 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 to the number of objects, 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.

[0023] Please refer to Figure 1 and Figure 2 The utility model provides a kind of novel high-voltage prohibition charging circuit, including triode U10, triode Q6, resistance R56, resistance R65, stabilivolt pipe DZ7, resistance R70, electric capacity C42, resistance R57, resistance R58, triode Q4, resistance R64, diode D14, resistance R98, resistance R97, triode U5, resistance R29, MOS charging switch QA1, resistance R52, stabilivolt diode D7, electric capacity C36 and electric capacity C37.

[0024] The emitter of the triode U10 is connected to the charger input C+, the base is connected to the collector of the triode Q6, and the collector is connected to the base of the triode Q4.

[0025] The emitter of the triode Q6 is connected to the emitter of the triode U10, and the base is connected to the negative electrode of the stabilivolt pipe DZ7.

[0026] One end of the resistance R56 is connected between the emitter of the triode U10 and the emitter of the triode Q6, and the other end is connected between the base of the triode U10 and the collector of the triode Q6.

[0027] One end of the resistance R57 is connected between the emitter of the triode U10 and the emitter of the triode Q6, and the other end is grounded.

[0028] One end of the resistance R65 is connected to the emitter of the triode Q6, and the other end is connected to the base of the triode Q6.

[0029] One end of the resistor R70 is connected to the positive pole of the voltage stabilizing tube DZ7, and the other end is grounded.

[0030] One end of the capacitor C42 is connected to the negative pole of the voltage stabilizing tube DZ7, and the other end is connected to the positive pole of the voltage stabilizing tube DZ7.

[0031] The resistor R58 is connected in series between the collector of the triode U10 and the base of the triode Q4.

[0032] One end of the resistor R64 is connected to the base of the triode Q4, and the other end is grounded.

[0033] The emitter of the triode Q4 is grounded, and the collector is connected to the negative pole of the diode D14.

[0034] The positive pole of the diode D14 is connected to the base of the triode U5.

[0035] The resistor R98 is connected in series between the positive pole of the diode D14 and the base of the triode U5.

[0036] The resistor R97 is connected in series between the base and the emitter of the triode U5.

[0037] The emitter of the triode U5 is connected to the IC chip, and the collector is connected to the gate of the MOS charging switch QA1. The resistor R29 is connected in series between the collector of the triode U5 and the gate of the MOS charging switch QA1.

[0038] The source of the MOS charging switch QA1 is connected to the charger input C-, and the drain is connected to the IC chip.

[0039] The capacitor C36 and the capacitor C37 are connected in series between the source and the drain of the MOS charging switch QA1. The resistor R52 is connected in series between the gate and the source of the MOS charging switch QA1.

[0040] The negative pole of the voltage stabilizing diode D7 is connected to the gate of the MOS charging switch QA1, and the positive pole is connected to the source of the MOS charging switch QA1.

[0041] The charger input C+ and the charger input C- are connected to a 42V voltage.

[0042] The resistance value of the resistor R56 is 3K ohms; the resistance value of the resistor R57 is 100K ohms; the resistance value of the resistor R65 is 100K ohms; the resistance value of the resistor R70 is 100K ohms; the resistance value of the resistor R58 is 3K ohms; the resistance value of the resistor R64 is 1M ohms; the resistance value of the resistor R98 is 3M ohms; the resistance value of the resistor R97 is 1M ohms; the resistance value of the resistor R29 is 20K ohms; and the resistance value of the resistor R52 is 100K ohms.

[0043] The voltage stabilizing tube DZ7 is a 42V voltage stabilizing tube. The IC chip is SH3676010B type chip. The voltage stabilizing tube DZ7 is a BZT52C type voltage stabilizing tube. The voltage stabilizing diode D7 is an LM3Z15VT1G type diode.

[0044] The working principle of the novel high-voltage prohibited charging circuit is as follows:

[0045] The default charging voltage is 42V, and the high-voltage prohibited charging is realized by controlling the MOS charging switch QA1. When there is no charger, the transistor U10 has no voltage, the transistor Q4 and the transistor are cut off, and the gate of the MOS charging switch QA1 has no voltage. At this time, the MOS charging switch QA1 is disconnected. When the charger input C+ and C- are connected to 42V voltage, the transistor Q6 is disconnected, and the base of the transistor Q6 is connected to the 42V voltage stabilizing tube DZ7. The turn-on voltage of the transistor Q6 is 42V+0.6V*2=43.2V. The voltage is provided to the transistor U10 through resistors R56 and R57, the transistor U10 and the transistor Q4 are turned on, the transistor U5 obtains the bias voltage and is turned on, the CHG voltage of the IC chip is provided to the gate of the charging MOS charging switch QA1 through the transistor U5, and the MOS charging switch is turned on. The charger charges the battery. When the charger input C+ or C- is connected to 45V voltage, the turn-on voltage of the transistor Q6 is 43.2V, which reaches the turn-on condition of the transistor Q6. After the transistor Q6 is turned on, the transistor U10 is disconnected, the transistor Q4 and the transistor U5 are cut off, and the MOS charging switch QA1 cannot be turned on, which realizes the function of high-voltage prohibited charging. The voltage stabilizing tube can be adjusted according to different voltages, and the formula (high voltage of prohibited charging=stabilizing tube+0.6V*2) is used. For example, 48.2V is required for prohibited charging, and the calculation method is 47+1.2=48.2V, which cannot be charged above 48.2V.

[0046] It should be noted that in this text, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0047] Furthermore, it is noted that the scope of the methods and systems of the embodiments of the present application are not limited to the performance of the functions described or illustrated in the order described or illustrated, nor are the embodiments of the present application limited to performing all or only a portion of such actions, or to performing such actions in the order written. Further, the described features can be combined in other examples.

[0048] 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 high voltage disable charging circuit, characterized by, The triode U10, the triode Q6, the resistor R56, the resistor R65, the voltage stabilizing tube DZ7, the resistor R70, the capacitor C42, the resistor R57, the resistor R58, the triode Q4, the resistor R64, the diode D14, the resistor R98, the resistor R97, the triode U5, the resistor R29, the MOS charging switch QA1, the resistor R52, the voltage stabilizing diode D7, the capacitor C36 and the capacitor C37 are included; the emitter of the triode U10 is connected with the charger input C+, the base is connected with the collector of the triode Q6, and the collector is connected with the base of the triode Q4; the emitter of the triode Q6 is connected with the emitter of the triode U10, and the base is connected with the negative electrode of the voltage stabilizing tube DZ7; one end of the resistor R56 is connected between the emitter of the triode U10 and the emitter of the triode Q6, and the other end is connected between the base of the triode U10 and the collector of the triode Q6; one end of the resistor R57 is connected between the emitter of the triode U10 and the emitter of the triode Q6, and the other end is grounded; one end of the resistor R65 is connected with the emitter of the triode Q6, and the other end is connected with the base of the triode Q6; one end of the resistor R70 is connected with the positive electrode of the voltage stabilizing tube DZ7, and the other end is grounded; one end of the capacitor C42 is connected with the negative electrode of the voltage stabilizing tube DZ7, and the other end is connected with the positive electrode of the voltage stabilizing tube DZ7; the resistor R58 is connected in series between the collector of the triode U10 and the base of the triode Q4; one end of the resistor R64 is connected with the base of the triode Q4, and the other end is grounded; the emitter of the triode Q4 is grounded, and the collector is connected with the negative electrode of the diode D14; the positive electrode of the diode D14 is connected with the base of the triode U5; the resistor R98 is connected in series between the positive electrode of the diode D14 and the base of the triode U5; the resistor R97 is connected in series between the base and the emitter of the triode U5; the emitter of the triode U5 is connected with the IC chip, and the collector is connected with the gate of the MOS charging switch QA1; the resistor R29 is connected in series between the collector of the triode U5 and the gate of the MOS charging switch QA1; the source of the MOS charging switch QA1 is connected with the charger input C-, and the drain is connected with the IC chip; the capacitor C36 and the capacitor C37 are connected in series between the source and the drain of the MOS charging switch QA1; the resistor R52 is connected in series between the gate and the source of the MOS charging switch QA1; the negative electrode of the voltage stabilizing diode D7 is connected with the gate of the MOS charging switch QA1, and the positive electrode is connected with the source of the MOS charging switch QA1.

2. The novel high voltage inhibit charging circuit according to claim 1, wherein, The charger input C+ and the charger input C- are connected with 42V voltage.

3. The novel high voltage inhibit charging circuit according to claim 1, wherein, The resistance value of the resistor R56 is 3K ohms; the resistance value of the resistor R57 is 100K ohms; the resistance value of the resistor R65 is 100K ohms; the resistance value of the resistor R70 is 100K ohms; the resistance value of the resistor R58 is 3K ohms; the resistance value of the resistor R64 is 1M ohms; the resistance value of the resistor R98 is 3M ohms; the resistance value of the resistor R97 is 1M ohms; the resistance value of the resistor R29 is 20K ohms; the resistance value of the resistor R52 is 100K ohms.

4. The novel high voltage inhibit charging circuit according to claim 1, wherein, The voltage stabilizing tube DZ7 is a 42V voltage stabilizing tube.

5. The novel high voltage inhibit charging circuit according to claim 1, wherein, The IC chip is SH3676010B type chip.

6. The novel high voltage inhibit charging circuit according to claim 1, wherein, The voltage stabilizing tube DZ7 is a BZT52C type voltage stabilizing tube.

7. The novel high voltage inhibit charging circuit according to claim 1, wherein, The voltage stabilizing diode D7 is an LM3Z15VT1 G type diode.

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