CN216851372U - Module power supply low-voltage-difference reverse connection prevention protection device - Google Patents
Module power supply low-voltage-difference reverse connection prevention protection device Download PDFInfo
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- CN216851372U CN216851372U CN202220164823.8U CN202220164823U CN216851372U CN 216851372 U CN216851372 U CN 216851372U CN 202220164823 U CN202220164823 U CN 202220164823U CN 216851372 U CN216851372 U CN 216851372U
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Abstract
The utility model discloses a module power supply low-voltage difference prevents reverse-connection protection device relates to the power supply and prevents reverse-connection protection technical field. The module power supply low-voltage difference reverse connection prevention protection device comprises a PMOS (P-channel metal oxide semiconductor) tube, a divider resistor, a self-recovery fuse and a transient voltage suppression diode, wherein the end part of the PMOS tube is connected with a power supply input end, and the self-recovery fuse is connected with a power supply output end. This module power supply low-voltage difference prevents reverse-connection protection device, the biggest bright spot of this circuit is with simple circuit, realized preventing reverse-connection, low-voltage difference, need not use the power management chip, high reliability, low-cost solution problem, realize that lithium cell group charges through simple circuit prevents reverse-connection function, certain overvoltage protection function of preventing has, make the voltage range that low-power MOS pipe can work enlarge through divider resistance, two PMOS design more reliably carry out the switching action back to back, can directly concatenate between charging source and group battery, can directly design on even battery charging protection board.
Description
Technical Field
The utility model relates to a power supply prevents reverse connection protection technical field, specifically is a module power supply low-dropout prevents reverse connection protection device.
Background
In the current mobile digital product, many circuits adopt a combined design, such as a WiFi module, a bluetooth module, a NBIot module, or a core module, etc., in practical use, it is often found that since a motherboard and a module are designed by two manufacturers, when the module needs to be independently powered or onboard, damage is caused by reverse connection of a positive electrode and a negative electrode, or the motherboard is designed as a standard voltage output (such as 5v) power output, if the module adopts a diode or a rectifier bridge added to an input port to realize reverse connection prevention function, since the forward voltage drop of the diode is 0.7v, the voltage drop of one rectifier bridge is 1.4v, the MCU of the module often works unstably due to too much voltage drop.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model relates to a module power supply prevents reverse connection protection specifically is a module power supply low-voltage difference prevents reverse connection protection device, and its principle is through a simple reliable electronic circuit, when the positive and negative reversal of input or high pressure suddenly, can give communication module or external module and protect.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a module power supply low-voltage difference prevents reverse-connection protection device, includes PMOS pipe, divider resistance, self-resuming fuse and transient voltage suppression diode, the end connection power input of PMOS pipe is just, self-resuming fuse is connected with power output and just.
The PMOS tube comprises Q1 and Q2 and a voltage dividing resistor comprising R25, and R26 forms a basic reverse connection protection.
The characteristic Vgs of the PMOS tube is negative voltage, the PMOS tube can be conducted, namely when the potential of a G point is zero, the potential of an S point needs to be positive, if the input is reversely connected, G is positive, S is negative, the PMOS tube is cut off, namely the power output end in the whole circuit does not output.
The MOS tube with low power is selected, the Vgs voltage is small (the standard voltage is +/-12V), and mainly aiming at the situation of a lithium battery pack 2/3/4 string, in order to deal with the relatively high voltage above 20V, voltage dividing resistors R25 and R26 are used for dividing voltage, so that the adaptability of a low-power device under the relatively high voltage is improved.
The utility model discloses a module power supply low dropout prevents reverse connection protection device, its beneficial effect who possesses as follows:
this module power supply low-voltage difference prevents reverse-connection protection device, the biggest bright spot of this circuit is with simple circuit, realized preventing reverse-connection, low-voltage difference, need not use the power management chip, high reliability, low-cost solution problem, realize that lithium cell group charges through simple circuit prevents reverse-connection function, certain overvoltage protection function of preventing has, make the voltage range that low-power MOS pipe can work enlarge through divider resistance, two PMOS design more reliably carry out the switching action back to back, can directly concatenate between charging source and group battery, can directly design on even battery charging protection board.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a parameter table of the PMOS transistor of the present invention.
In the figure: 1. a PMOS tube; 2. a voltage dividing resistor; 3. a self-healing fuse; 4. a transient voltage suppressor diode; 5. the power supply input end is positive; 6. the power output end is positive.
Detailed Description
The utility model discloses a mainly relate to a module power supply low-voltage difference prevents reverse-connection protection device, the realization of its function is realized through following technical scheme:
the device consists of the following parts as shown in figure 1;
during normal operation, power is input from the power input end 5 and output from the power output end 6, if the power input end 5 is instantaneously over-voltage, for example, the input end voltage spike interference, the transient voltage suppression diode 4 is changed into a resistance-like state, the voltage is limited, the voltage is clamped to about 20V, the self-recovery fuse 3FU1 is also changed into a resistance state from a conduction state, a part of excessive spike energy is consumed, and the over-voltage protection is formed at the inlet end
The design realizes the reverse connection prevention function: the PMOS tube 1 comprises Q1 and Q2 and the voltage dividing resistor 2 comprises R25, and R26 forms a basic reverse connection protection.
According to the characteristics of the PMOS transistor 1, Vgs is negative, that is, when the G point potential is zero, the S point potential is positive.
As seen from the figure, if the input is reversely connected, G is positive, S is negative, and the PMOS tube 1 is cut off.
I.e. no output is provided at the power supply output 6 throughout the circuit.
The design adopts two PMOS back to avoid single-phase conduction and more reliably execute the switching action;
the design selects a low-power MOS tube, Vgs voltage is small (standard voltage is +/-12V), the design is expected to mainly aim at the situation of a lithium battery pack 2/3/4 string, in order to deal with the relatively high voltage of more than 20V, a divider resistor 2 is used for dividing voltage by R25 and R26, and due to the special design, the adaptability of a low-power device under the relatively high voltage is improved
After the whole circuit is normally conducted, the voltage drop is very low because the conduction resistance is very small.
According to the specification of the PMOS transistor 1, as shown in FIG. 2, when the VDS voltage is 10V, the on-resistance is 50 mOhm, and when the maximum allowable current is about 4A, the voltage drop is 0.02V.
In order to eliminate the error, the conventional anti-reverse-connection circuit is adopted, the output parameters of the charger need to be changed, for example, the charging cut-off voltage of the 4-string lithium battery pack charger is 16.8V, if anti-reverse-connection protection needs to be carried out, the voltage needs to be adjusted to 18.2V, different lithium battery materials or different anti-reverse-connection circuits are adopted, the input voltage needs to be further adjusted according to the needs, and the charger cannot be used universally or the lithium battery pack is damaged due to the fact that the charger is used mistakenly.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a module power supply low-dropout prevents reverse connection protection device, includes PMOS pipe (1), divider resistance (2), self-resuming fuse (3) and transient voltage suppression diode (4), its characterized in that: the end part of the PMOS tube (1) is connected with a power input end positive (5), and the self-recovery fuse (3) is connected with a power output end positive (6).
2. The module power supply low-dropout reverse-connection prevention protection device according to claim 1, characterized in that: the PMOS tube (1) is composed of Q1 and Q2 and the voltage dividing resistor (2) comprising R25, and R26 forms a basic reverse connection protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220164823.8U CN216851372U (en) | 2022-01-21 | 2022-01-21 | Module power supply low-voltage-difference reverse connection prevention protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220164823.8U CN216851372U (en) | 2022-01-21 | 2022-01-21 | Module power supply low-voltage-difference reverse connection prevention protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216851372U true CN216851372U (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220164823.8U Active CN216851372U (en) | 2022-01-21 | 2022-01-21 | Module power supply low-voltage-difference reverse connection prevention protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216851372U (en) |
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2022
- 2022-01-21 CN CN202220164823.8U patent/CN216851372U/en active Active
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