CN220305706U - Overvoltage and undervoltage protection circuit of Darlington voltage stabilizer - Google Patents
Overvoltage and undervoltage protection circuit of Darlington voltage stabilizer Download PDFInfo
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- CN220305706U CN220305706U CN202321802945.6U CN202321802945U CN220305706U CN 220305706 U CN220305706 U CN 220305706U CN 202321802945 U CN202321802945 U CN 202321802945U CN 220305706 U CN220305706 U CN 220305706U
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Abstract
The utility model relates to the technical field of electronic circuits, and particularly discloses an overvoltage and undervoltage protection circuit of a Darlington voltage stabilizer, wherein a first end of a first capacitor is connected with a first end of a MOS tube, and a second end of the first capacitor is connected with a second end of the MOS tube and a first end of a first resistor; the second end of the first switch module is connected with the negative electrode of the battery pack, and the controlled end of the first switch module is connected with the second end of the first resistor, the output end of the under-voltage protection module and the output end of the over-voltage protection module; the first end of the first voltage stabilizing tube is connected with the second end of the first resistor and the controlled end of the Darlington voltage stabilizer, and the second end of the first voltage stabilizing tube is connected with the negative electrode of the battery pack; the second end of the Darlington voltage stabilizer, the input end of the under-voltage protection module and the input end of the over-voltage protection module are all connected with the VCC output end; the utility model can increase the immunity of the voltage stabilizer circuit, has the functions of under-voltage protection and over-voltage protection, and prevents the battery pack from consuming electricity and damaging the subsequent circuit during faults.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to an overvoltage and undervoltage protection circuit of a Darlington voltage stabilizer.
Background
The Darlington voltage stabilizer is also called Darlington tube or composite tube, which connects two triodes together to form an equivalent new triode, which is equivalent to the amplification factor of the triodes being the product of the two, and the Darlington connection method is commonly used in the power amplifier and the regulated power supply in the field of electronic circuit design.
The existing Darlington voltage stabilizer circuit has no effective fault protection action under the power supply action, and cannot play a role in cutting off fault events, for example, under the undervoltage fault state, the electric quantity of a battery pack is easy to be exhausted, and the electric quantity is lost; under the overvoltage fault state, the rear-stage circuit is easy to exceed the withstand voltage and damage, the use of products is affected, and certain potential safety hazards exist.
Disclosure of Invention
Aiming at the problems that the existing Darlington voltage stabilizer circuit is easy to consume the electric quantity of the battery pack or cause the damage of a later-stage circuit caused by exceeding withstand voltage, the utility model provides the overvoltage and undervoltage protection circuit of the Darlington voltage stabilizer, which can increase the immunity of the voltage stabilizer circuit, has the functions of undervoltage protection and overvoltage protection, and prevents the electric quantity of the battery pack from being consumed and the later-stage circuit from being damaged during faults.
In order to solve the technical problems, the utility model provides the following specific scheme:
the overvoltage and undervoltage protection circuit of the Darlington voltage stabilizer comprises an MOS tube, a first capacitor, a first resistor, a first switch module, a first voltage stabilizing tube, the Darlington voltage stabilizer, an undervoltage protection module and an overvoltage protection module;
the first end of the MOS tube is connected with the positive electrode of the battery pack, the second end of the MOS tube is connected with the first end of the Darlington voltage stabilizer, and the controlled end of the MOS tube is connected with the first end of the first switch module;
the first end of the first capacitor is connected with the first end of the MOS tube, and the second end of the first capacitor is connected with the second end of the MOS tube and the first end of the first resistor;
the second end of the first switch module is connected with the negative electrode of the battery pack, and the controlled end of the first switch module is connected with the second end of the first resistor, the output end of the under-voltage protection module and the output end of the over-voltage protection module;
the first end of the first voltage stabilizing tube is connected with the second end of the first resistor and the controlled end of the Darlington voltage stabilizer, and the second end of the first voltage stabilizing tube is connected with the negative electrode of the battery pack;
the second end of the Darlington voltage stabilizer, the input end of the under-voltage protection module and the input end of the over-voltage protection module are all connected with the VCC output end.
In some embodiments, the first switching module includes a first transistor, a second resistor, and a third resistor;
the first end of the second resistor is connected with the second end of the first resistor, the output end of the undervoltage protection module and the output end of the overvoltage protection module, and the second end of the second resistor is connected with the base electrode of the first triode;
the first end of the third resistor is connected with the base electrode of the first triode, and the second end of the third resistor is connected with the negative electrode of the battery pack;
the collector of the first triode is connected with the controlled end of the MOS tube, and the emitter of the first triode is connected with the negative electrode of the battery pack, so that the MOS tube can be conducted under the condition that the first triode is conducted, and the battery pack can supply power normally; under the condition that the first triode is cut off, the MOS tube is cut off, and then the battery pack stops supplying power.
In some embodiments, a fourth resistor is further arranged between the collector of the first triode and the controlled end of the MOS tube, and the fourth resistor can enable the collector voltage of the first triode to change on the collector resistor along with the change of the base current, so that a current amplifying effect is achieved, and the MOS tube is promoted to be conducted.
In some embodiments, a fifth resistor is arranged between the first end and the controlled end of the MOS tube, a first diode is arranged between the first end of the MOS tube and the positive electrode of the battery pack, and the fifth resistor plays a role in providing bias voltage and discharging resistance and plays a role in protecting the MOS tube.
In some embodiments, a second diode is arranged between the first end of the first voltage stabilizing tube and the controlled end of the darlington voltage stabilizer, so that the one-way conduction function is achieved, and the stability of the circuit is improved.
In some embodiments, the under-voltage protection module includes a third diode, a fourth diode and a fifth diode which are sequentially connected in series, a first end of the third diode is connected with the VCC output end, and a second end of the fifth diode is connected with a first end of the second resistor, so as to realize the under-voltage protection function of the darlington voltage regulator.
In some embodiments, the overvoltage protection module includes a second voltage regulator, a sixth resistor, and a second triode;
the first end of the second voltage stabilizing tube is connected with the VCC output end, the second end of the second voltage stabilizing tube is connected with the base electrode of the second triode and the first end of the sixth resistor, and the second end of the sixth resistor is connected with the negative electrode of the battery pack;
and the collector electrode of the second triode is connected with the first end of the second resistor, and the emitter electrode of the second triode is connected with the negative electrode of the battery pack, so that the overvoltage protection effect on the Darlington voltage stabilizer is realized.
In some embodiments, the overvoltage protection module further includes a second capacitor, a first end of the second capacitor is connected to a first end of the second voltage regulator tube, and a second end of the second capacitor is connected to a second end of the sixth resistor, so that a filtering effect is achieved, and use stability of the circuit is improved.
In some embodiments, the darlington voltage stabilizer includes a third triode and a fourth triode, the base electrode of the third triode is connected with the emitter electrode of the fourth triode, the collector electrode of the third triode and the collector electrode of the fourth triode are connected with the positive electrode of the battery pack, the emitter electrode of the third triode is connected with the VCC output end, the base electrode of the fourth triode is connected with the first end of the first voltage stabilizer, the third triode and the fourth triode are connected, the amplification factor is improved, and the use requirement of a circuit is met.
In some embodiments, the darlington voltage regulator further includes a seventh resistor, a first end of the seventh resistor is connected to the collector of the third triode and the second end of the MOS transistor, a second end of the seventh resistor is connected to the collector of the fourth triode, and the seventh resistor can change the voltage of the collector of the third triode along with the change of the base current, so as to play a role in current amplification.
According to the overvoltage and undervoltage protection circuit of the Darlington voltage stabilizer, the undervoltage protection module and the overvoltage protection module are arranged, when an undervoltage fault state or an overvoltage fault state occurs, the MOS tube can be cut off through the first switch module, so that the Darlington voltage stabilizer stops working, the immunity of the voltage stabilizer circuit can be improved, the undervoltage protection and overvoltage protection functions are achieved, the battery pack electric quantity is prevented from being exhausted when faults occur, the later-stage circuit is prevented from being damaged, and the use stability and the safety of the circuit are effectively improved.
Drawings
Fig. 1 is a schematic diagram of an overvoltage and undervoltage protection circuit of a darlington voltage regulator according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a first switch module;
FIG. 3 is a schematic diagram of an under-voltage protection module;
FIG. 4 is a schematic diagram of an overvoltage protection module;
10-a first switch module;
a 20-darlington voltage regulator;
30-an under-voltage protection module;
40-overvoltage protection module.
Detailed Description
The preferred embodiments of the present application will be described in detail below with reference to the attached drawings so that the advantages and features of the present application will be more readily understood by those skilled in the art, thereby more clearly defining the scope of the present application.
Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present application are illustrated as being implemented in a suitable computing environment. The following description is based on the illustrated embodiments of the present application and should not be taken as limiting other embodiments not described in detail herein.
For example, the overvoltage and undervoltage protection circuit of the Darlington voltage stabilizer comprises a MOS tube, a first capacitor, a first resistor, a first switch module, a first voltage stabilizing tube, the Darlington voltage stabilizer, an undervoltage protection module and an overvoltage protection module; the first end of the MOS tube is connected with the positive electrode of the battery pack, the second end of the MOS tube is connected with the first end of the Darlington voltage stabilizer, and the controlled end of the MOS tube is connected with the first end of the first switch module; the first end of the first capacitor is connected with the first end of the MOS tube, and the second end of the first capacitor is connected with the second end of the MOS tube and the first end of the first resistor; the second end of the first switch module is connected with the negative electrode of the battery pack, and the controlled end of the first switch module is connected with the second end of the first resistor, the output end of the under-voltage protection module and the output end of the over-voltage protection module; the first end of the first voltage stabilizing tube is connected with the second end of the first resistor and the controlled end of the Darlington voltage stabilizer, and the second end of the first voltage stabilizing tube is connected with the negative electrode of the battery pack; the second end of the Darlington voltage stabilizer, the input end of the under-voltage protection module and the input end of the over-voltage protection module are all connected with the VCC output end.
The embodiment provides a darlington voltage stabilizer overvoltage and undervoltage protection circuit, which can increase the immunity of the voltage stabilizer circuit, has the functions of undervoltage protection and overvoltage protection, and prevents the battery pack from being exhausted and the post-stage circuit from being damaged during faults.
Embodiment one:
as shown in fig. 1, the overvoltage and undervoltage protection circuit of the darlington voltage stabilizer comprises a MOS transistor, a first capacitor, a first resistor, a first switch module 10, a first voltage stabilizing transistor, the darlington voltage stabilizer 20, an undervoltage protection module 30 and an overvoltage protection module 40, wherein the MOS transistor is Q1, the first capacitor is C1, the first resistor is R5, and the first voltage stabilizing transistor is ZD2.
The first end of the MOS tube Q1 is connected with the positive pole BAT+ of the battery pack, the second end of the MOS tube Q1 is connected with the first end of the Darlington voltage stabilizer 20, and the controlled end of the MOS tube Q1 is connected with the first end of the first switch module 10; the first end of the first capacitor C1 is connected with the first end of the MOS tube Q1, and the second end of the first capacitor C1 is connected with the second end of the MOS tube Q1 and the first end of the first resistor R5; the second end of the first switch module 10 is connected with the negative pole GND of the battery pack, and the controlled end of the first switch module 10 is connected with the second end of the first resistor R5, the output end of the undervoltage protection module 30 and the output end of the overvoltage protection module 40; the first end of the first voltage stabilizing tube ZD2 is connected with the second end of the first resistor R5 and the controlled end of the Darlington voltage stabilizer 20, and the second end of the first voltage stabilizing tube ZD2 is connected with the negative electrode GND of the battery pack; the second terminal of the darlington voltage regulator 20, the input terminal of the under-voltage protection module 30, and the input terminal of the over-voltage protection module 40 are all connected to the VCC output terminal.
The darlington voltage stabilizer overvoltage and undervoltage protection circuit provided in this example is configured to cut off the MOS transistor through the first switch module 10 when the voltage or overvoltage fault state occurs and further stop the operation of the darlington voltage stabilizer 20 when the power supply of the battery pack to the later stage circuit is implemented by using the darlington voltage stabilizer 20.
The specific working process of the protection circuit is as follows, because the MOS tube Q1 and the first capacitor C1 are in parallel connection, when the protection circuit is started, the first capacitor C1 is in instant short circuit, the first switch module 10 is conducted through the first resistor R5, the MOS tube Q1 is further conducted, the positive electrode BAT+ of the battery pack is normally powered, the first voltage stabilizing tube ZD2 works in a breakdown area to form a voltage stabilizing state, the VCC output end outputs normal voltage to supply power to a later-stage circuit, and the starting work of the circuit of the Darlington voltage stabilizer 20 is completed.
When the darlington voltage stabilizer 20 has an under-voltage fault state, the output end VCC is pulled down by a load of a later-stage circuit, the first switch module 10 is cut off through the under-voltage protection module 30, the MOS tube Q1 is cut off, and the darlington voltage stabilizer 20 stops working; when the darlington voltage stabilizer 20 is in an overvoltage fault state, a voltage spike appears at the VCC output end, the first switch module 10 is cut off through the overvoltage protection module 40, then the MOS tube Q1 is cut off, the darlington voltage stabilizer 20 stops working, thereby playing roles of under-voltage protection and overvoltage protection, preventing the battery pack from being consumed in power failure and damaging a later-stage circuit, and effectively improving the use stability and safety of the circuit.
Embodiment two:
as shown in fig. 2, the first switch module 10 includes a first triode, a second resistor and a third resistor, wherein the first triode is Q4, the second resistor is R6, and the third resistor is R7.
The first end of the second resistor R6 is connected with the second end of the first resistor R5, the output end of the undervoltage protection module 30 and the output end of the overvoltage protection module 40, and the second end of the second resistor R6 is connected with the base electrode of the first triode Q4; the first end of the third resistor R7 is connected with the base electrode of the first triode Q4, and the second end of the third resistor R7 is connected with the negative electrode GND of the battery pack; the collector of the first triode Q4 is connected with the controlled end of the MOS tube Q1, the emitter of the first triode Q4 is connected with the negative pole GND of the battery pack, and therefore the MOS tube Q1 can be conducted under the condition that the first triode Q4 is conducted, and the battery pack can supply power normally; under the condition that the first triode Q4 is cut off, the MOS tube Q1 is cut off, and then the battery pack stops supplying power.
Specifically, when the circuit is started, the first capacitor C1 is in instant short circuit, a loop is formed through the first resistor R5, the second resistor R6 and the third resistor R7, the resistance value of the third resistor R7 meets the requirement that the voltage drop formed by the third resistor R7 can reach the conduction of the first triode Q4, a short voltage is provided to enable the MOS tube Q1 to be conducted, the battery pack supplies power normally, the first voltage stabilizing tube ZD2 works in a breakdown area to form a voltage stabilizing state, the VCC output end outputs normal voltage to supply power to a later-stage circuit, and the starting work of the circuit of the Darlington voltage stabilizer 20 is completed.
When the darlington voltage stabilizer 20 has an under-voltage fault state, the output end VCC is pulled down by a load of a later-stage circuit, the base voltage of the first triode Q4 is pulled down through the under-voltage protection module 30, the first triode Q4 is cut off, the MOS tube Q1 is cut off along with the first triode Q4, and the darlington voltage stabilizer 20 stops working; when the darlington voltage stabilizer 20 has an overvoltage fault state, a voltage spike appears at the VCC output end, the base voltage of the first triode Q4 is pulled down by the overvoltage protection module 40, the first triode Q4 is turned off, the MOS tube Q1 is turned off accordingly, the darlington voltage stabilizer 20 stops working, and the undervoltage protection and overvoltage protection of the darlington voltage stabilizer 20 are realized.
In some application scenarios, a fourth resistor R4 is further disposed between the collector of the first triode Q4 and the controlled end of the MOS transistor Q1, where the fourth resistor R4 can enable the collector voltage of the first triode Q4 to change on the collector resistor along with the change of the base current, which plays a role in current amplification, and promotes the conduction of the MOS transistor Q1.
A fifth resistor is arranged between the first end and the controlled end of the MOS tube Q1, the fifth resistor is R3, a first diode is arranged between the first end of the MOS tube Q1 and the positive pole BAT+ of the battery pack, the first diode is D2, the fifth resistor R3 plays a role in providing bias voltage and discharging resistance, plays a role in protecting the MOS tube Q1, the first diode D2 plays a role in unidirectional conduction, and the stability of the circuit is improved.
A second diode is arranged between the first end of the first voltage stabilizing tube ZD2 and the controlled end of the darlington voltage stabilizer 20, the second diode is D3, the second diode D3 plays a role in unidirectional conduction, and stability of the circuit is improved.
Embodiment III:
as shown in fig. 3, the undervoltage protection module 30 includes a third diode, a fourth diode and a fifth diode sequentially connected in series, where the third diode is D4, the fourth diode is D5, and the fifth diode is D6, a first end of the third diode D4 is connected to the VCC output end, and a second end of the fifth diode D6 is connected to a first end of the second resistor R6, so as to implement an undervoltage protection function on the darlington voltage regulator 20.
When the darlington voltage regulator 20 has an under-voltage fault state, the output end VCC is pulled down by the load of the later stage circuit, the third diode D4, the fourth diode D5 and the fifth diode D6 are turned on, the base voltage of the first triode Q4 is pulled down, the first triode Q4 is turned off, the MOS transistor Q1 is turned off accordingly, and the darlington voltage regulator 20 stops working.
The third diode D4, the fourth diode D5 and the fifth diode D6 are used herein to ensure that under normal conditions, when the darlington voltage regulator 20 is turned on, the third diode D4, the fourth diode D5 and the fifth diode D6 are not turned on enough due to too small voltage drop, the second resistor R6 and the third resistor R7 divide the voltage, and the voltage of the third resistor R7 needs to be greater than 0.7V and less than 2V, so that the first triode Q4 can be turned on under normal conditions and turned off when an under-voltage fault occurs.
Embodiment four:
as shown in fig. 4, the overvoltage protection module 40 includes a second voltage regulator, a sixth resistor and a second triode, wherein the second voltage regulator is ZD1, the sixth resistor is R8, the second triode is Q5, a first end of the second voltage regulator ZD1 is connected to the VCC output end, a second end of the second voltage regulator ZD1 is connected to the base of the second triode Q5 and the first end of the sixth resistor R8, and a second end of the sixth resistor R8 is connected to the negative electrode GND of the battery pack; the collector of the second triode Q5 is connected with the first end of the second resistor R6, and the emitter of the second triode Q5 is connected with the negative pole GND of the battery pack, so that overvoltage protection effect on the Darlington voltage stabilizer 20 is realized.
When the darlington voltage stabilizer 20 has an overvoltage fault state, a voltage spike appears at the VCC output end, when the voltage spike reaches the breakdown voltage of the second voltage stabilizing tube ZD1, the second voltage stabilizing tube ZD1 works in the breakdown state, and the current flowing through the sixth resistor R8 causes the two ends of the sixth resistor R8 to form a voltage drop, the second triode Q5 is conducted, the base voltage of the first triode Q4 is pulled down, the first triode Q4 is cut off, the MOS tube Q1 is cut off, the darlington voltage stabilizer 20 stops working, and overvoltage protection of the darlington voltage stabilizer 20 is realized.
In an example, the overvoltage protection module 40 further includes a second capacitor, the second capacitor is C2, a first end of the second capacitor C2 is connected to a first end of the second voltage stabilizing tube ZD1, a second end of the second capacitor C2 is connected to a second end of the sixth resistor R8, and the second capacitor C2 plays a role in filtering, so as to improve the stability of the circuit in use.
Fifth embodiment:
the darlington voltage stabilizer 20 comprises a third triode and a fourth triode, the third triode is Q2, the fourth triode is Q3, the base electrode of the third triode Q2 is connected with the emitter electrode of the fourth triode Q3, the collector electrode of the third triode Q2 and the collector electrode of the fourth triode Q3 are connected with the positive pole BAT+ of the battery pack, the emitter electrode of the third triode Q2 is connected with the VCC output end, the base electrode of the fourth triode Q3 is connected with the first end of the first voltage stabilizer ZD2, the third triode Q2 and the fourth triode Q3 are connected, the amplification factor is improved, and the use requirement of a circuit is met.
The darlington voltage stabilizer 20 further includes a seventh resistor, the seventh resistor is R2, a first end of the seventh resistor R2 is connected to the collector of the third triode Q2 and the second end of the MOS transistor Q1, a second end of the seventh resistor R2 is connected to the collector of the fourth triode Q3, and the seventh resistor R2 can change the voltage of the collector of the third triode Q2 along with the change of the base current, thereby playing a role of current amplification.
In summary, according to the overvoltage and undervoltage protection circuit for the darlington voltage stabilizer, the undervoltage protection module and the overvoltage protection module are arranged, when an undervoltage fault state or an overvoltage fault state occurs, the MOS tube can be cut off through the first switch module, so that the darlington voltage stabilizer stops working, the immunity of the voltage stabilizer circuit can be improved, the undervoltage protection and overvoltage protection functions are achieved, the battery pack electric quantity is prevented from being exhausted when faults occur, the later-stage circuit is prevented from being damaged, and the use stability and the safety of the circuit are effectively improved.
The term "module" as used herein may be a software or hardware object executing on the computing system. The different components, modules, engines, and services described herein may be implemented as objects on the computing system. The apparatus and methods described herein may be implemented in software, but may also be implemented in hardware, which is within the scope of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Claims (10)
1. The overvoltage and undervoltage protection circuit of the Darlington voltage stabilizer is characterized by comprising an MOS tube, a first capacitor, a first resistor, a first switch module, a first voltage stabilizing tube, the Darlington voltage stabilizer, an undervoltage protection module and an overvoltage protection module;
the first end of the MOS tube is connected with the positive electrode of the battery pack, the second end of the MOS tube is connected with the first end of the Darlington voltage stabilizer, and the controlled end of the MOS tube is connected with the first end of the first switch module;
the first end of the first capacitor is connected with the first end of the MOS tube, and the second end of the first capacitor is connected with the second end of the MOS tube and the first end of the first resistor;
the second end of the first switch module is connected with the negative electrode of the battery pack, and the controlled end of the first switch module is connected with the second end of the first resistor, the output end of the under-voltage protection module and the output end of the over-voltage protection module;
the first end of the first voltage stabilizing tube is connected with the second end of the first resistor and the controlled end of the Darlington voltage stabilizer, and the second end of the first voltage stabilizing tube is connected with the negative electrode of the battery pack;
the second end of the Darlington voltage stabilizer, the input end of the under-voltage protection module and the input end of the over-voltage protection module are all connected with the VCC output end.
2. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 1, wherein the first switch module includes a first transistor, a second resistor, and a third resistor;
the first end of the second resistor is connected with the second end of the first resistor, the output end of the undervoltage protection module and the output end of the overvoltage protection module, and the second end of the second resistor is connected with the base electrode of the first triode;
the first end of the third resistor is connected with the base electrode of the first triode, and the second end of the third resistor is connected with the negative electrode of the battery pack;
and the collector electrode of the first triode is connected with the controlled end of the MOS tube, and the emitter electrode of the first triode is connected with the negative electrode of the battery pack.
3. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 2, wherein a fourth resistor is further disposed between the collector of the first triode and the controlled end of the MOS transistor.
4. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 1, wherein a fifth resistor is provided between the first end and the controlled end of the MOS transistor, and a first diode is provided between the first end of the MOS transistor and the positive electrode of the battery pack.
5. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 1, wherein a second diode is disposed between the first end of the first voltage regulator and the controlled end of the darlington voltage regulator.
6. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 2, wherein the undervoltage protection module includes a third diode, a fourth diode, and a fifth diode connected in series in order, a first end of the third diode is connected to the VCC output terminal, and a second end of the fifth diode is connected to a first end of the second resistor.
7. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 2, wherein the overvoltage protection module comprises a second voltage regulator tube, a sixth resistor and a second triode;
the first end of the second voltage stabilizing tube is connected with the VCC output end, the second end of the second voltage stabilizing tube is connected with the base electrode of the second triode and the first end of the sixth resistor, and the second end of the sixth resistor is connected with the negative electrode of the battery pack;
and the collector electrode of the second triode is connected with the first end of the second resistor, and the emitter electrode of the second triode is connected with the negative electrode of the battery pack.
8. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 7, wherein the overvoltage protection module further comprises a second capacitor, a first end of the second capacitor is connected to a first end of the second voltage regulator tube, and a second end of the second capacitor is connected to a second end of the sixth resistor.
9. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 1, wherein the darlington voltage regulator includes a third triode and a fourth triode, a base electrode of the third triode is connected with an emitter electrode of the fourth triode, a collector electrode of the third triode and a collector electrode of the fourth triode are connected with a positive electrode of the battery pack, an emitter electrode of the third triode is connected with a VCC output end, and a base electrode of the fourth triode is connected with a first end of the first voltage regulator.
10. The darlington voltage regulator overvoltage/undervoltage protection circuit according to claim 9, wherein the darlington voltage regulator further comprises a seventh resistor, a first end of the seventh resistor is connected to the collector of the third triode and the second end of the MOS transistor, and a second end of the seventh resistor is connected to the collector of the fourth triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321802945.6U CN220305706U (en) | 2023-07-10 | 2023-07-10 | Overvoltage and undervoltage protection circuit of Darlington voltage stabilizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321802945.6U CN220305706U (en) | 2023-07-10 | 2023-07-10 | Overvoltage and undervoltage protection circuit of Darlington voltage stabilizer |
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| CN220305706U true CN220305706U (en) | 2024-01-05 |
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| CN202321802945.6U Active CN220305706U (en) | 2023-07-10 | 2023-07-10 | Overvoltage and undervoltage protection circuit of Darlington voltage stabilizer |
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2023
- 2023-07-10 CN CN202321802945.6U patent/CN220305706U/en active Active
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