CN210350810U - Power supply charging protection device - Google Patents
Power supply charging protection device Download PDFInfo
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- CN210350810U CN210350810U CN201920794769.3U CN201920794769U CN210350810U CN 210350810 U CN210350810 U CN 210350810U CN 201920794769 U CN201920794769 U CN 201920794769U CN 210350810 U CN210350810 U CN 210350810U
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- overvoltage
- overcurrent protection
- protection chip
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Abstract
The utility model relates to a power charging protection device. Charger connector P1And a first overvoltage and overcurrent protection chip U1Connection, first overvoltage, overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2Connection, second overvoltage, overcurrent protection chip U2Connecting port P with battery to be charged2Connection, first overvoltage, overcurrent protection chip U1Two ends are respectively connected with a resistor R1Resistance R2Resistance R3Resistance R4The first stage input filter capacitor C1The first stage output filterWave capacitor C2Second overvoltage and overcurrent protection chip U2Two ends are respectively connected with a resistor R6Resistance R7Resistance R8Resistance R9A second stage input filter capacitor C3A second stage output filter capacitor C4. The utility model discloses an external resistance adjusts excessive pressure and latches threshold, undervoltage latch threshold, and excessive pressure, undervoltage are protected the circuit among the charging process.
Description
Technical Field
The utility model relates to a power charging device technical field, specifically speaking relate to power charging protection device.
Background
The power supply is a device for converting chemical energy, hydraulic energy, wind power, solar energy and other forms of energy into electric energy, and is widely applied to the fields of industrial automatic control, military equipment, scientific research equipment, industrial control equipment, computers and computers, communication equipment, power equipment, instruments and meters, medical equipment, semiconductor refrigeration and heating and the like, wherein the charging power supply is a rectifying device for charging storage batteries, the voltage of the power supply needs to be kept in a safe range during charging, otherwise, the power supply is burnt out or the service life of the power supply is shortened due to overhigh voltage, even safety accidents can be caused, or the service life of the charging batteries is influenced due to the fact that the charging is not carried out due to overlow voltage, and therefore, the power supply charging protection device is provided.
Disclosure of Invention
An object of the utility model is to solve above-mentioned problem, provide power charging protection device, it can be when voltage excessive pressure, under-voltage, protect rechargeable battery.
In order to solve the above problem, the utility model discloses a technical scheme as follows:
the power supply charging protection device comprises a charger connector P1A connector P for the battery to be charged2The first overvoltage and overcurrent protection chip U is characterized in that1And a second overvoltage and overcurrent protection chip U2Series charger connector P1Positive electrode and first overvoltage and overcurrent protection chip U1Input terminal connection, first overvoltage and overcurrent protection chip U1Output end and second overvoltage and overcurrent protection chip U2Input terminal connection, second overvoltage and overcurrent protection chip U2The output end is connected with a connector P of the battery to be charged2Positive electrode connection, charger connection port P1Negative electrode, first overvoltage and overcurrent protection chip U1Signal ground pin and second overvoltage and overcurrent protection chip U2Signal ground pin and battery connector P to be charged2The negative pole is grounded, and a power switch P is arranged on the circuit3；
First overvoltage and overcurrent protection chip U1Two ends are respectively connected with a resistor R1Resistance R2Resistance R3Resistance R4Resistance R1And R2Intermediate node and first overvoltage and overcurrent protection chip U connected in series1Over-voltage storage pin connection, resistor R3And a resistor R4Intermediate node and first overvoltage and overcurrent protection chip U connected in series1The undervoltage latch pin is connected with the resistor R5One end of (A) is grounded, and a resistor R5The other end of the first overvoltage and overcurrent protection chip U is connected with the first overvoltage and overcurrent protection chip U1The overload current-limiting pin and the first-stage input filter capacitor C1And a first overvoltage and overcurrent protection chip U1Is connected with the input end of the first stage output filter capacitor C2And a first overvoltage and overcurrent protection chip U1The output ends of the two-way valve are connected;
second overvoltage and overcurrent protection chip U2Two ends are respectively connected with a resistor R6Resistance R7Resistance R8Resistance R9Resistance R6And R7The middle node and a second overvoltage and overcurrent protection chip U which are connected in series2Over-voltage storage pin connection, resistor R8And a resistor R9The middle node and a second overvoltage and overcurrent protection chip U which are connected in series2The undervoltage latch pin is connected with the resistor R10One end of (A) is grounded, and a resistor R10The other end of the first overvoltage and overcurrent protection chip is connected with a second overvoltage and overcurrent protection chip U2The overload current-limiting pin and the second-stage input filter capacitor C3And a second overvoltage and overcurrent protection chip U2Is connected with the input end of the second stage output filter capacitor C4And a second overvoltage and overcurrent protection chip U2Is connected with the output end of the power supply.
Further, a battery connector P to be charged2Two ends of the diode D are connected in parallel1Diode D1Negative electrode and second overvoltage and overcurrent protection chip U2Is connected to the output terminal of a diode D1The positive electrode of (2) is grounded.
The utility model discloses a theory of operation does:
when the current reaches the threshold, the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2After 20.7ms (typical value) of masking time, the circuit is switched off, and the off state is kept in a retry period; first overvoltage and overcurrent protection coreSlice U1And a second overvoltage and overcurrent protection chip U2Latching the off-state, first overvoltage, overcurrent protection chip U after the shielding time1And a second overvoltage and overcurrent protection chip U2The current limit is continuously maintained. In addition, the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2Has reverse current protection and thermal cut-off protection. The first overvoltage and overcurrent protection chip U in the system1And a second overvoltage and overcurrent protection chip U2The double protection is achieved by serial use.
The first protection being a resistance R1And R2Intermediate node and first overvoltage and overcurrent protection chip U connected in series1The overvoltage latch pin is connected to set a protection value for battery charging overvoltage. Through a resistance R3And R4The serial intermediate node is connected to a first overvoltage and overcurrent protection chip U1The under-voltage latch pin is used for setting the protection value of the battery discharging point under-voltage. Will resistance R5Is connected to a first overvoltage and overcurrent protection chip U1The overload current limit pin (SETI) to set the current limit value.
The second protection being by a resistor R6And R7The serial intermediate node is connected to a second overvoltage and overcurrent protection chip U2To set the protection value of the battery charging overvoltage (OVLO). Through a resistance R8And R9The serial intermediate node is connected to a second overvoltage and overcurrent protection chip U2The undervoltage latch pin (UVLO) is used for setting the protection value of battery discharge point undervoltage. Will resistance R10Is connected to a second overvoltage and overcurrent protection chip U2The overload current limit pin (SETI) to set the current limit value.
Capacitor C1Is a first-stage input filter capacitor, a capacitor C2Is a first stage output filter capacitor, a capacitor C3Is a second stage input filter capacitor, a capacitor C4Is the second stage output filter capacitor.
The utility model has the advantages that:
by adjusting the resistance R1And a resistance R2To regulate the first overpressure, overpressureFlow protection chip U1Is detected by the Over Voltage Latch (OVLO) threshold. Regulating resistance R1And a resistance R2The proportion of the first overvoltage and overcurrent protection chip U is adjusted1The undervoltage latch (UVLO) threshold. The resistance value of the resistor R5 is adjusted to adjust the overload current-limiting threshold. Regulating resistance R6And R7To regulate the second overvoltage and overcurrent protection chip U2Is detected by the Over Voltage Latch (OVLO) threshold. Regulating resistance R8And a resistance R9To regulate the second overvoltage and overcurrent protection chip U2The undervoltage latch (UVLO) threshold. Regulating resistance R10The overload current-limiting threshold is adjusted by the resistance value of the resistor.
First overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2The input voltage of the first overvoltage and overcurrent protection chip U is higher than an overvoltage latch (OVLO) threshold or lower than an undervoltage latch (UVLO) threshold1And a second overvoltage and overcurrent protection chip U2The internal electronic switch will automatically turn off the output to prevent damage to the protected circuit.
When the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2When the current reaches the overload current-limiting threshold, the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2That is, after the masking time, the internal electronic switch will automatically turn off the output and remain off for a retry period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Description of the drawings:
fig. 1 is a schematic circuit diagram of the power supply charging protection device of the present invention;
reference numerals: charging of electricityConnector P1-1, a battery connection port P to be charged2-2, a first overvoltage overcurrent protection chip U1-3 resistance R1-31, resistance R2-32, resistance R3-33, resistance R4-34, resistance R5-35, first stage input filter capacitance C1-36, first stage output filter capacitance C2-37, second overvoltage, overcurrent protection chip U2-4, resistance R6-41, resistance R7-42, resistance R8-43, resistance R9-44, resistance R10-45, second stage input filter capacitance C3-46, second stage output filter capacitance C4-47, power switch P3-5, diode D1-6。
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
Referring to the description as shown in figure 1 of the drawings,
the power supply charging protection device comprises a charger connector P1A connector P for the battery to be charged2First overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2Series charger connector P1Positive electrode and first overvoltage and overcurrent protection chip U1Input terminal connection, first overvoltage and overcurrent protection chip U1Output end and second overvoltage and overcurrent protection chip U2Input terminal connection, second overvoltage and overcurrent protection chip U2The output end is connected with a connector P of the battery to be charged2Positive electrode connection, charger connection port P1Negative electrode, first overvoltage and overcurrent protection chip U1Signal ground pin and second overvoltage and overcurrent protection chip U2Signal ground pin and battery connector P to be charged2The negative pole is grounded, and a power switch P is arranged on the circuit3；
First overvoltage and overcurrent protection chip U13 two ends are respectively connected with a resistor R 131. Resistance R 232. Resistance R 333. Resistance R 434, resistance R 131 and R 232 intermediate nodes connected in series and first overvoltage and overcurrent protection chip U13 overvoltage storage pin connection, resistor R 333 and a resistor R 434 intermediate node and first overvoltage and overcurrent protection chip U connected in series13 undervoltage latch pin connection, resistor R 535 has one end grounded and a resistor R 535 is connected with a first overvoltage and overcurrent protection chip U13 overload current-limiting pin, first stage input filter capacitor C 136 and a first overvoltage and overcurrent protection chip U13, the first stage outputs a filter capacitor C 237 and a first overvoltage and overcurrent protection chip U13, the output ends are connected;
second overvoltage and overcurrent protection chip U24 two ends are respectively connected with a resistor R 641. Resistance R 742. Resistance R 843. Resistance R 944, resistance R 641 and R 742 series connection intermediate node and second overvoltage, overcurrent protection chip U24 overvoltage storage pin connection, resistor R 843 and a resistor R 944 series connection intermediate node and second overvoltage and overcurrent protection chip U24 undervoltage latch pin connection, resistor R 1045 is grounded at one end and has a resistor R 1045 is connected with a second overvoltage and overcurrent protection chip U24 overload current-limiting pin and second-stage input filter capacitor C 346 and a second overvoltage and overcurrent protection chip U24, and a second stage output filter capacitor C 447 and a second overvoltage and overcurrent protection chip U24, the output ends are connected; .
To-be-charged battery connector P 22 two-end parallel diode D1Diode D1Negative electrode and second overvoltage and overcurrent protection chip U2Is connected to the output terminal of a diode D1The positive electrode of (2) is grounded.
When the positive and negative stage connecting circuit of the battery is reversely connected, the diode is conducted, and current directly flows back to the battery through the diode, so that a fuse connected with the front end of the battery is fused to protect the battery and other circuit components.
The first overvoltage and overcurrent protection chip U of the embodiment1Second overvoltage and overcurrent protection chip U2The model is MAX 14571.
First overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2The battery power supply protection chip can adjust overvoltage and overcurrent protection for system protection, can bear positive and negative input voltage up to +/-40V, and is internally provided with a switch FET with RON of 100m omega (typical value). First overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2The overvoltage protection (OVP) range of the transformer is 6V to 36V, and the undervoltage protection (UVP) range of the transformer is 4.5V to 24V. The over-voltage latch (OVLO) and under-voltage latch (UVLO) thresholds are set by external resistors. The internal over-voltage latch (OVLO) threshold is preset to 33V (typical value) and the internal under-voltage latch (UVLO) threshold is preset to 19.2V (typical value). When the current reaches the threshold, the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2After 20.7ms (typical value) of masking time, the circuit is switched off, and the off state is kept in a retry period; first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2Latching the off-state, first overvoltage, overcurrent protection chip U after the shielding time1And a second overvoltage and overcurrent protection chip U2The current limit is continuously maintained. In addition, the first overvoltage and overcurrent protection chip U1And a second overvoltage and overcurrent protection chip U2Has reverse current protection and thermal cut-off protection. The first overvoltage and overcurrent protection chip U in the system1And a second overvoltage and overcurrent protection chip U2The double protection is achieved by serial use.
The first re-protection sets the protection value for battery charging overvoltage for a 5 pin Over Voltage Latch (OVLO) connected to U1 through the intermediate node of the resistor R1 in series with R2. The intermediate node connected with the resistors R3 and R4 in series is connected to a first overvoltage and overcurrent protection chip U1The undervoltage latch pin (UVLO) is used for setting the protection value of battery discharge point undervoltage. Connecting resistor R5 to first overvoltage and overcurrent protection chip U1Overload current-limiting pin of (SETI) to set the current limit value.
The second protection is that the middle node of the resistor R6 and the resistor R7 which are connected in series is connected to a second overvoltage and overcurrent protection chip U2To set the protection value of the battery charging overvoltage (OVLO). The intermediate node connected in series through resistors R8 and R9 is connected to a second overvoltage and overcurrent protection chip U2The undervoltage latch pin (UVLO) is used for setting the protection value of battery discharge point undervoltage. Connecting resistor R10 to second overvoltage and overcurrent protection chip U2The overload current limit pin (SETI) to set the current limit value.
Capacitor C1 is the first stage input filter capacitor, capacitor C2 is the first stage output filter capacitor, and capacitor C3 is the second stage input filter capacitor. Capacitor C4 is the second stage output filter capacitor.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred embodiments of the present invention, and the present invention is not limited by the above preferred embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the present invention as claimed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The power supply charging protection device comprises a charger connector P1A connector P for the battery to be charged2The first overvoltage and overcurrent protection chip U is characterized in that1And a second overvoltage and overcurrent protection chip U2Series charger connector P1Positive electrode and first overvoltage and overcurrent protection chip U1The input end is connected with the first overvoltage,Overcurrent protection chip U1Output end and second overvoltage and overcurrent protection chip U2Input terminal connection, second overvoltage and overcurrent protection chip U2The output end is connected with a connector P of the battery to be charged2Positive electrode connection, charger connection port P1Negative electrode, first overvoltage and overcurrent protection chip U1Signal ground pin and second overvoltage and overcurrent protection chip U2Signal ground pin and battery connector P to be charged2The negative pole is grounded, and a power switch P is arranged on the circuit3；
First overvoltage and overcurrent protection chip U1Two ends are respectively connected with a resistor R1Resistance R2Resistance R3Resistance R4Resistance R1And R2Intermediate node and first overvoltage and overcurrent protection chip U connected in series1Over-voltage storage pin connection, resistor R3And a resistor R4Intermediate node and first overvoltage and overcurrent protection chip U connected in series1The undervoltage latch pin is connected with the resistor R5One end of (A) is grounded, and a resistor R5The other end of the first overvoltage and overcurrent protection chip U is connected with the first overvoltage and overcurrent protection chip U1The overload current-limiting pin and the first-stage input filter capacitor C1And a first overvoltage and overcurrent protection chip U1Is connected with the input end of the first stage output filter capacitor C2And a first overvoltage and overcurrent protection chip U1The output ends of the two-way valve are connected;
second overvoltage and overcurrent protection chip U2Two ends are respectively connected with a resistor R6Resistance R7Resistance R8Resistance R9Resistance R6And R7The middle node and a second overvoltage and overcurrent protection chip U which are connected in series2Over-voltage storage pin connection, resistor R8And a resistor R9The middle node and a second overvoltage and overcurrent protection chip U which are connected in series2The undervoltage latch pin is connected with the resistor R10One end of (A) is grounded, and a resistor R10The other end of the first overvoltage and overcurrent protection chip is connected with a second overvoltage and overcurrent protection chip U2The overload current-limiting pin and the second-stage input filter capacitor C3And a second overvoltage and overcurrent protection chip U2Is connected with the input end of the second stage output filter circuitContainer C4And a second overvoltage and overcurrent protection chip U2Is connected with the output end of the power supply.
2. The power supply charging protection device according to claim 1, wherein the battery connector P to be charged is connected to2Two ends of the diode D are connected in parallel1Diode D1Negative electrode and second overvoltage and overcurrent protection chip U2Is connected to the output terminal of a diode D1The positive electrode of (2) is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920794769.3U CN210350810U (en) | 2019-05-30 | 2019-05-30 | Power supply charging protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920794769.3U CN210350810U (en) | 2019-05-30 | 2019-05-30 | Power supply charging protection device |
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| CN210350810U true CN210350810U (en) | 2020-04-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469367A (en) * | 2022-11-15 | 2022-12-13 | 中煤科工西安研究院(集团)有限公司 | Underground coal mine while-drilling azimuth electromagnetic remote detection device and design method thereof |
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2019
- 2019-05-30 CN CN201920794769.3U patent/CN210350810U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469367A (en) * | 2022-11-15 | 2022-12-13 | 中煤科工西安研究院(集团)有限公司 | Underground coal mine while-drilling azimuth electromagnetic remote detection device and design method thereof |
| CN115469367B (en) * | 2022-11-15 | 2023-02-28 | 中煤科工西安研究院(集团)有限公司 | Underground coal mine while-drilling azimuth electromagnetic remote detection device and design method thereof |
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