CN220022358U - Reverse connection-preventing charging protection circuit and charger - Google Patents
Reverse connection-preventing charging protection circuit and charger Download PDFInfo
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- CN220022358U CN220022358U CN202320972263.3U CN202320972263U CN220022358U CN 220022358 U CN220022358 U CN 220022358U CN 202320972263 U CN202320972263 U CN 202320972263U CN 220022358 U CN220022358 U CN 220022358U
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Abstract
The utility model belongs to the technical field of charging protection, and discloses an anti-reverse connection charging protection circuit and a charger. The reverse connection prevention charging protection circuit includes: the charging module is used for charging the battery to be charged; the power input module is used for being electrically connected with an external power supply to receive charging current input by the external power supply; the reverse connection preventing module is arranged between the power input module and the charging module and is used for providing the charging current input by the power input module for the charging module to charge when the power input module is connected with an external power supply; and when the power input module is reversely connected with an external power supply, the power input module is disconnected from the charging module. The utility model has the functions of preventing the reverse connection of the charger and preventing the charging current from exceeding the maximum allowable charging current of the battery, and has the characteristics of good controllability and high safety in the charging protection process.
Description
Technical Field
The utility model relates to the technical field of charging protection, in particular to a reverse connection prevention charging protection circuit and a charger.
Background
The electronic and electric appliance charged products sold in the European Union need CE certification, which has a test about battery safety, namely, random short circuit of a charger circuit in a charged state, and the charging current is required not to exceed the maximum charging current calibrated by the battery. In the existing linear charging scheme, under the condition of short-circuiting the linear charging component, the circuit is in an unprotected state, and the charging current of the battery easily exceeds the maximum charging current calibrated by the battery, so that CE safety certification fails. Meanwhile, the requirement is also a trend of national standard GB authentication test requirement, more safety charging requirements are newly added, and authentication is performed by the current charging scheme, so that authentication failure is likely to occur.
Disclosure of Invention
In order to solve the technical problem of unsafe charging process, the utility model provides a reverse connection prevention charging protection circuit and a charger, and specifically, the technical scheme of the utility model is as follows: the charging module is used for charging the battery to be charged; the power input module is used for being electrically connected with an external power supply to receive charging current input by the external power supply; the reverse connection prevention module is arranged between the power input module and the charging module and is used for providing the charging current input by the power input module for the charging module to charge when the power input module is connected with an external power supply; and when the power input module is reversely connected with the external power supply, disconnecting the power input module from the charging module.
In some embodiments, the anti-reverse module comprises: the first MOS tube and the first resistor; the source electrode of the first MOS tube is electrically connected with the output end of the power input module, and the grid electrode of the first MOS tube is grounded through the first resistor; the drain electrode of the first MOS tube is electrically connected with the charging module.
Preferably, the anti-reverse connection module further comprises: a charging protection control terminal; wherein: the charging protection control end is arranged between the grid electrode of the first MOS tube and the first resistor and is used for receiving an external charging control signal and controlling the on and off of the first MOS tube.
In some embodiments, the anti-reverse module further comprises: the second MOS tube and the second resistor; wherein: the grid electrode of the second MOS tube is electrically connected with the output end of the power input module through the second resistor, the drain electrode of the second MOS tube is grounded after passing through the first resistor, and the source electrode of the second MOS tube is electrically connected with the source electrode of the first MOS tube.
Preferably, the anti-reverse connection module further comprises: a charging protection control terminal; wherein: the charging protection control end is electrically connected with the grid electrode of the second MOS tube and is used for receiving an external charging control signal and controlling the on and off of the first MOS tube.
In some embodiments, the charging module comprises: the charging tube, the third resistor and the charging control and protection control end; the charging tube specifically comprises: the third MOS transistor and the first triode; the emitter of the first triode is electrically connected with the drain electrode of the first MOS tube, the collector of the first triode is used as the output end of the charging tube, and the base of the first triode is electrically connected with the drain electrode of the third MOS tube; the grid electrode of the third MOS tube is electrically connected with the emitter electrode of the first triode through the third resistor, and the source electrode of the third MOS tube is electrically connected with the charging control and protection control end; the charging control and protection control end is used for receiving external charging control and protection signals and controlling the conduction degree of the third MOS tube.
In some embodiments, the power input module specifically includes: the sixth resistor, the first capacitor and the charging detection port; one end of the sixth resistor is electrically connected with the external power supply and the source electrode of the first MOS tube, and the other end of the sixth resistor is grounded through the first capacitor; the charging detection port is arranged between the sixth resistor and the first capacitor and is used for externally detecting charging voltage.
In some embodiments, after the charging module, a charging detection module is further included, specifically including: the fourth resistor, the fifth resistor, the charging tube current detection port, the system current detection port, the battery charging current detection port and the grounding detection port; one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with the anode of the battery; the charging tube current detection port is arranged between the collector electrode of the first triode and the fifth resistor and is used for detecting the charging current of the charger; the system current detection port is arranged between the fourth resistor and the positive electrode of the battery and is used for supplying power to a system; one end of the fifth resistor is electrically connected with the negative electrode of the battery, and the other end of the fifth resistor is grounded; the battery charging current detection port is arranged between the negative electrode of the battery and the fifth resistor and is used for detecting the charging current of the battery; the grounding detection port is arranged between the fifth resistor and the grounding end and is used for detecting the grounding state of the negative electrode of the battery.
In some embodiments, the first MOS transistor and the second MOS transistor are enhancement PMOS transistors; the third MOS tube is an enhanced NMOS tube; the first triode is a PNP triode.
Based on the same technical conception, the utility model also provides an anti-reverse-connection charging protection charger, which comprises any anti-reverse-connection charging protection circuit.
Compared with the prior art, the utility model has at least one of the following beneficial effects:
1. on the basis of the existing linear charging scheme, an anti-reverse connection module is added, so that when a charger is reversely connected, the charging module is cut off in time, and the safety of the battery charging process is ensured.
2. The protection control port is added on the reverse connection prevention module for charging protection, the reverse connection prevention is realized, meanwhile, the charging loop is cut off under the condition of abnormal charging, charging safety is ensured, the protection circuit is provided with two protection circuits, one protection circuit with single fault, the other circuit can work normally under the condition of abnormal charging, the charging loop is cut off, the charging current does not exceed the maximum charging current of the battery, and the passing of the authentication test is ensured.
3. The MOS tube is applied to the reverse connection prevention module and controlled, so that the problem that accurate control cannot be performed by using a circuit protection method such as PTC, breaker, FUSE can be solved, under the former three modes, the protection point is set low and is easy to trigger by mistake, the protection setting is high and is easy to not trigger under the condition of abnormal charging, and the authentication failure risk is high.
Drawings
The above features, technical features, advantages and implementation of the present utility model will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and easily understood manner.
FIG. 1 is a circuit diagram of one embodiment of an anti-reverse charging protection circuit of the present utility model;
FIG. 2 is a circuit diagram of another embodiment of an anti-reverse charging protection circuit of the present utility model;
reference numerals illustrate: 100. the device comprises an anti-reverse connection module, a charging module, a power input module and a charging detection module.
Detailed Description
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For simplicity of the drawing, only the parts relevant to the utility model are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present utility model, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In one embodiment, referring to fig. 1 of the specification, the anti-reverse charging protection circuit provided by the present utility model includes: the reverse connection preventing module 100 is arranged between the power input module 300 and the charging module 200, and is used for providing the charging current input by the power input module 300 to the charging module 200 for charging when the power input module 300 is connected with an external power supply; when the power input module 300 is reversely connected with the external power source, the power input module 300 is disconnected from the charging module. A charging module 200 for charging a battery to be charged; the power input module 300 is configured to be electrically connected to an external power source, so as to receive a charging current input by the external power source;
specifically, as shown in fig. 1 of the specification, the anti-reverse connection module 100 includes a first MOS transistor M 1 First resistor R 1 The method comprises the steps of carrying out a first treatment on the surface of the First MOS tube M 1 The source electrode of the first MOS tube M is electrically connected with the output end of the power input module 1 The grid of (C) passes through a first resistor R 1 Grounding; first MOS tube M 1 Is electrically connected with the input end of the charging module. When the charger is correctly connected, the first MOS transistor M 1 The source electrode of (a) is high level, the first MOS tube M 1 The grid electrode of the transistor is low level, the first MOS transistor M 1 Conducting, and charging through a charging module; when the charger is reversely connected, the first MOS tube M 1 The source electrode of (a) is low level, the first MOS tube M 1 The grid electrode of the transistor is at a high level, the first MOS transistor M 1 Cut off, cut off the charging module; the power supply battery of electronic equipment generally uses a chemical battery having a positive electrode and a negative electrode, and is chargedThe positive electrode of the battery is charged, so that electrons are lost from the positive electrode, electrons are obtained from the negative electrode, and oxidation-reduction reaction occurs in the chemical battery; the reverse connection of the charger during charging cannot realize the chemical reaction process, so that the reverse connection of the charger is prevented through the reverse connection prevention module, and the purpose of protecting the battery is achieved.
Charging module 200, comprising: charging tube, third resistor R 3 A charging control and protection control terminal VDRV; the charging tube specifically includes: third MOS tube M 3 First triode Q 1 The method comprises the steps of carrying out a first treatment on the surface of the First triode M 3 Emitter and first MOS transistor M 1 Is electrically connected with the drain electrode of the first triode Q 1 The collector of (1) is used as the output end of the charging tube, the first stage Q 1 Base of tube and third MOS tube M 3 Is electrically connected to the drain electrode of the transistor; third MOS tube M 3 Through a third resistor R 3 And a first triode Q 1 Emitter electrode of the third MOS transistor M is electrically connected with 3 The source electrode of the (C) is electrically connected with a charging control and protection control end VDRV; the charging control and protection control terminal VDRV is used for receiving external charging control and protection signals and controlling the third MOS tube M 3 Is a conductive state of the battery.
Specifically, in the charging module 200, the cpu controls the first MOS transistor M through the charging control and protection control port VDRV 1 And further pass through the first triode Q operating in the amplifying region 1 The charging current is controlled to be linearly reduced along with the continuous rising of the voltage of the battery when the current of the charger is continuously injected into the battery, so that the linear charging is realized; meanwhile, the first MOS tube M can be realized through the charging control and protection control port VDRV 1 Source control of (a) and thereby change the first triode Q 1 The magnitude of the charging current is controlled by the conduction degree of the capacitor, so that the first triode Q can be realized through the charging control and protection control port VDRV when the charging is abnormal 1 And the connection between the charging module and the battery is cut off, so that the effect of charging protection is achieved.
The charge detection module 400 includes: fourth resistor R 4 Fifth resistor R 5 A charging tube current detection port I_SENSE, a systemA system current detection port v_sys, a battery charging current detection port i_gauge, a ground detection port GND; fifth resistor R 5 One end is electrically connected with the first triode Q 1 The other end of the collector is electrically connected with the anode of the battery; a charging tube current detection port I_SENSE arranged on the first triode Q 1 The collector electrode of the battery charger is connected with the fifth resistor; a system current detection port V_SYS arranged at the fifth resistor R 5 The battery is connected with the positive electrode of the battery and is used for supplying power to the system; sixth resistor R 6 One end is electrically connected with the cathode of the battery, and the other end is grounded; a battery charging current detection port I_GAUGE arranged at the negative electrode of the battery and a sixth resistor R 6 The battery charging device is used for detecting the charging current of the battery; a ground detection port GND provided in the sixth resistor R 6 And the grounding terminal is used for detecting the grounding state of the negative electrode of the battery.
Specifically, the charging detection module 400 is configured to monitor a charging process of the battery by the charger, where the charging current is composed of a battery charging current and a system current; the protection and linear charging functions of the reverse connection prevention charging protection circuit can be realized through monitoring the charging current; in terms of protection function, the detected charging current provides a reference for the anti-reverse connection module, and when the charging current exceeds a preset value, the charging protection control terminal VCHG_CTRL enables the first MOS tube M 1 Cut off, thus cut off the charging module; secondly, under the condition that the charging current exceeds a preset value, the third MOS tube M is made to be 3 And the connection between the charging module and the battery is cut off, so that the protection function is realized.
The power input module 300 includes: sixth resistor R 6 First capacitor C 1 Charge detection port vchg_d; sixth resistor R 6 One end of the first MOS tube M is connected with an external power supply 1 Is electrically connected with the source electrode of the sixth resistor R 6 The other end passes through the first capacitor C 1 Grounding; the charging detection port vchg_d is disposed between the sixth resistor and the first capacitor, and is used for externally detecting the charging voltage.
Specifically, a surge phenomenon is usually generated during the process of plugging the charger into the power supplyThe surge current and surge voltage generated by the resistor are several times of rated voltage and rated current, which easily causes damage to equipment, and the sixth resistor R 6 The access of the circuit can effectively inhibit the influence of the phenomenon on the circuit; whether the charger is connected is determined based on the voltage detected from the charge detection port vchg_d, and when the charger is connected is detected, the charging module 200 charges the battery.
In this embodiment, the first MOS transistor M 1 And a second MOS tube M 2 Are all enhanced PMOS tubes; third MOS tube M 3 Is an enhanced NMOS tube; first triode Q 1 Is PNP type triode.
Specifically, in the charging process of this embodiment, when the power input module detects that the charger is connected normally (the power supply terminal is at a high level, and the ground terminal is at a low level), charging is started; during charging, the charging detection module 400 provides reference to the CPU according to the detected charging current and battery voltage, and controls the third MOS transistor M through the charging control and protection control terminal VDRV 3 Gate-source voltage of the third MOS transistor M 3 The change of the gate-source voltage of the transistor is led to pass through the third MOS transistor M 3 Flow to the first triode Q 1 The charging current of the battery is changed, and the purpose of charging the battery in a linear charging working mode is achieved.
For the charging process, the embodiment has two protection measures, and the first protection measure is the reverse connection prevention protection measure; the second protection is to pass through the charging protection control terminal VCHG_CTRL to the first MOS tube M when the charging current abnormality is detected by the charging detection module 1 The gate of the MOS transistor is provided with a high level, and according to the conduction characteristic of the enhanced PMOS transistor, the first MOS transistor M 1 When the grid electrode of the MOS transistor is at a high level, the first MOS transistor M 1 The battery is turned off, so that the charging module 200 is cut off, the charging current provided by the charging module 200 is prevented from exceeding the maximum charging current allowed by the battery, the safety authentication failure is caused, meanwhile, the battery is prevented from being burnt out due to the fact that the battery continuously inputs large current due to abnormal charging state, the battery used in the electronic equipment is a chemical battery, the characteristic of the battery belongs to inflammable and explosive products, the potential safety hazard exists, and the continuous large-current charging has fire windRisk.
Specifically, in this embodiment, during the process of the european union CE safety certification concerning the battery safety test, the random short circuit fault is performed on this embodiment in the charging state:
1. at a sixth resistance R 6 Or a first resistor R 1 Or a third resistor R 3 When a single fault occurs, the charging module 200 can normally control the charging current to charge the battery; first resistor R 1 Or a third resistor R 3 When single fault occurs, the grid electrode of the MOS tube loses protection and can still work normally in a short time.
2. At the first capacitance C 1 In case of single failure, due to the first capacitor C 1 The filter function is no longer provided, the charging voltage is abnormally fluctuated, and the charging detection port VCHG_D detects the abnormal charging voltage and prohibits charging.
3. In the first MOS tube M 1 When a single fault occurs, the charging module 200 may normally control the charging current.
4. When the third MOS tube M3 has single fault, the system passes through the third resistor R 3 Or a fourth resistor R 4 Detecting charging current, and controlling the first MOS tube M through the charging protection control terminal VCHG_CTRL when abnormality occurs 1 The gate voltage of the first MOS tube M is raised to enable the first MOS tube M 1 And shut off, thereby shutting off the charging circuit.
5. In the second MOS tube M 2 When single fault occurs, a MOS tube M is made 1 The grid electrode and the source electrode of the first MOS tube M are directly connected 1 And cutting off the charging circuit.
6. At a fifth resistance R 5 In case of single failure, the current can pass through the fourth resistor R 4 Detecting the charging current, the charging module 200 can normally control the charging current; at the fourth resistor R 4 In case of single failure, the voltage can be controlled by the fifth resistor R 5 Detecting the charging current, the charging module 200 can still control the charging current normally.
Therefore, the technical problems that the reverse connection preventing charging protection circuit is randomly short-circuited, the charging current cannot exceed the maximum charging current calibrated by the battery, and the charging process is unsafe are solved.
In one ofIn an embodiment, the anti-reverse module further comprises: a charging protection control terminal vchg_ctrl; wherein: the charging protection control end is arranged on the first MOS tube M 1 Gate of (2) and first resistor R 1 The first MOS tube M is used for receiving an external charging control signal and controlling the first MOS tube M 1 Is turned on and off.
Another embodiment of the present utility model, referring to fig. 2, a second resistor R is added to the anti-reverse connection module 100 according to the above embodiment 2 Second MOS tube M 2 The method comprises the steps of carrying out a first treatment on the surface of the Second MOS tube M 2 Is an enhanced PMOS tube; second MOS tube M 2 Through a second resistor R 2 Is electrically connected with the output end of the power input module, and a second MOS tube M 2 Through a first resistor R 1 Rear ground, second MOS tube M 2 Source electrode of (a) and first MOS transistor M 1 Is electrically connected to the source of the transistor.
When the charger is correctly connected, the first MOS transistor M 1 The source electrode of (a) is high level, the first MOS tube M 1 The grid electrode of the transistor is low level, the first MOS transistor M 1 Conducting; meanwhile, a second MOS tube M 2 The grid electrode of the second MOS tube M is at a high level 2 Cut-off, current flows through the first MOS tube M 1 Charging is achieved through a charging module; when the charger is reversely connected, the first MOS tube M 1 The source electrode of (a) is low level, the first MOS tube M 1 The grid electrode of the transistor is at a high level, the first MOS transistor M 1 Cut-off; meanwhile, a second MOS tube M 2 The grid electrode of the second MOS tube M is at a low level 2 Conducting and charging current can pass through the second MOS tube M 2 Through a first resistor R 1 Accessing a grounding end;
based on the above embodiment, referring to fig. 2 of the specification, the anti-reverse connection module 200 further includes: a charging protection control terminal VCHG_CTRL; wherein: charging protection control end VCHG_CTRL and second MOS tube M 2 Is electrically connected with the grid electrode for receiving an external charging control signal and controlling the first MOS tube M 1 Is turned on and off.
Specifically, in this embodiment, during the process of the european union CE safety certification concerning the battery safety test, the random short circuit fault is performed on this embodiment in the charging state:
1. at a sixth resistance R 6 Or a first resistor R 1 Or a second resistance R 2 Or a third resistor R 3 When a single fault occurs, the charging module 200 can normally control the charging current to charge the battery; first resistor R 1 Or a second resistance R 2 Or a third resistor R 3 When in failure, the grid electrode of the MOS tube loses protection and can still work normally in a short time.
2. At the first capacitance C 1 In case of single failure, due to the first capacitor C 1 The filter function is not provided any more, the charging voltage is abnormally fluctuated, and the charging voltage is abnormally detected through the charging detection port VCHG_D, so that charging is forbidden.
3. In the first MOS tube M 1 When a single fault occurs, the charging module 200 may normally control the charging current.
4. When the third MOS tube M3 has single fault, the system passes through the third resistor R 3 Or a fourth resistor R 4 Detecting charging current, and reducing the second MOS tube M through the charging protection control terminal VCHG_CTRL when abnormality occurs 2 Gate voltage of the second MOS transistor M 2 Conducting to control the first MOS tube M 1 The gate voltage of the first MOS tube M is raised to enable the first MOS tube M 1 And shut off, thereby shutting off the charging circuit.
5. In the second MOS tube M 2 When single fault occurs, a MOS tube M is made 1 The grid electrode and the source electrode of the first MOS tube M are directly connected 1 And cutting off the charging circuit.
6. At a fifth resistance R 5 In case of single failure, the current can pass through the fourth resistor R 4 Detecting the charging current, the charging module 200 can normally control the charging current; at the fourth resistor R 4 In case of single failure, the voltage can be controlled by the fifth resistor R 5 Detecting the charging current, the charging module 200 can still control the charging current normally.
Therefore, the technical problems that the reverse connection preventing charging protection circuit is randomly short-circuited, the charging current cannot exceed the maximum charging current calibrated by the battery, and the charging process is unsafe are solved.
Based on the same technical conception, the utility model also provides a reverse connection prevention charging protection charger, which comprises any one of the reverse connection prevention charging protection circuits, and because the charged products of the electronic and electric appliances sold in European Union need to pass CE authentication, the test about battery safety requires that the charger circuit is randomly short-circuited in a charging state, and the charging cannot exceed the maximum charging current calibrated by the battery under the condition. The reverse connection prevention charging protection circuit has a reverse connection prevention function, has two charging protection functions, and can be applied to a charger by selecting any specific circuit according to the needs.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.
Claims (10)
1. An anti-reverse charging protection circuit, comprising:
the charging module is used for charging the battery to be charged;
the power input module is used for being electrically connected with an external power supply to receive charging current input by the external power supply;
the reverse connection prevention module is arranged between the power input module and the charging module and is used for providing the charging current input by the power input module for the charging module to charge when the power input module is connected with an external power supply; and when the power input module is reversely connected with the external power supply, disconnecting the power input module from the charging module.
2. The reverse connection preventing charge protection circuit according to claim 1, wherein,
the reverse connection preventing module comprises: the first MOS tube and the first resistor;
the source electrode of the first MOS tube is electrically connected with the output end of the power input module, and the grid electrode of the first MOS tube is grounded through the first resistor; the drain electrode of the first MOS tube is electrically connected with the charging module.
3. The anti-reverse charging protection circuit of claim 2, wherein the anti-reverse module further comprises: a charging protection control terminal; wherein:
the charging protection control end is arranged between the grid electrode of the first MOS tube and the first resistor and is used for receiving an external charging control signal and controlling the on and off of the first MOS tube.
4. The reverse connection preventing charge protection circuit according to claim 2, wherein,
the reverse connection preventing module further comprises: the second MOS tube and the second resistor; wherein:
the grid electrode of the second MOS tube is electrically connected with the output end of the power input module through the second resistor, the drain electrode of the second MOS tube is grounded after passing through the first resistor, and the source electrode of the second MOS tube is electrically connected with the source electrode of the first MOS tube.
5. The anti-reverse charging protection circuit of claim 4, wherein the anti-reverse module further comprises: a charging protection control terminal; wherein:
the charging protection control end is electrically connected with the grid electrode of the second MOS tube and is used for receiving an external charging control signal and controlling the on and off of the first MOS tube.
6. The reverse connection preventing charge protection circuit according to claim 3 or 5, wherein,
the charging module includes: the charging tube, the third resistor and the charging control and protection control end;
the charging tube specifically comprises: the third MOS transistor and the first triode;
the emitter of the first triode is electrically connected with the drain electrode of the first MOS tube, the collector of the first triode is used as the output end of the charging tube, and the base of the first triode is electrically connected with the drain electrode of the third MOS tube;
the grid electrode of the third MOS tube is electrically connected with the emitter electrode of the first triode through the third resistor, and the source electrode of the third MOS tube is electrically connected with the charging control and protection control end;
the charging control and protection control end is used for receiving external charging control and protection signals and controlling the conduction degree of the third MOS tube.
7. The reverse connection preventing charge protection circuit according to claim 6, wherein,
the power input module specifically comprises: the sixth resistor, the first capacitor and the charging detection port;
one end of the sixth resistor is electrically connected with the external power supply and the source electrode of the first MOS tube, and the other end of the sixth resistor is grounded through the first capacitor;
the charging detection port is arranged between the sixth resistor and the first capacitor and is used for externally detecting charging voltage.
8. The reverse connection preventing charge protection circuit according to claim 7, wherein,
after the charging module, the charging device further comprises a charging detection module, specifically comprising: the fourth resistor, the fifth resistor, the charging tube current detection port, the system current detection port, the battery charging current detection port and the grounding detection port;
one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with the anode of the battery;
the charging tube current detection port is arranged between the collector electrode of the first triode and the fifth resistor and is used for detecting charging current output by the charging tube;
the system current detection port is arranged between the fourth resistor and the positive electrode of the battery and is used for supplying power to a system;
one end of the fifth resistor is electrically connected with the negative electrode of the battery, and the other end of the fifth resistor is grounded;
the battery charging current detection port is arranged between the negative electrode of the battery and the fifth resistor and is used for detecting the charging current of the battery;
the grounding detection port is arranged between the fifth resistor and the grounding end and is used for detecting the grounding state of the negative electrode of the battery.
9. The reverse connection preventing charge protection circuit according to claim 8, wherein,
the first MOS tube is an enhanced PMOS tube;
the third MOS tube is an enhanced NMOS tube;
the first triode is a PNP triode.
10. A reverse-connection-preventing charging protection charger, characterized by comprising the reverse-connection-preventing charging protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320972263.3U CN220022358U (en) | 2023-04-26 | 2023-04-26 | Reverse connection-preventing charging protection circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320972263.3U CN220022358U (en) | 2023-04-26 | 2023-04-26 | Reverse connection-preventing charging protection circuit and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220022358U true CN220022358U (en) | 2023-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320972263.3U Active CN220022358U (en) | 2023-04-26 | 2023-04-26 | Reverse connection-preventing charging protection circuit and charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220022358U (en) |
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2023
- 2023-04-26 CN CN202320972263.3U patent/CN220022358U/en active Active
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