CN203522267U - Vehicle charging power source having input under-voltage protection function - Google Patents
Vehicle charging power source having input under-voltage protection function Download PDFInfo
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- CN203522267U CN203522267U CN201320650666.2U CN201320650666U CN203522267U CN 203522267 U CN203522267 U CN 203522267U CN 201320650666 U CN201320650666 U CN 201320650666U CN 203522267 U CN203522267 U CN 203522267U
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Abstract
The utility model relates to the electronic technology field and particularly relates to a vehicle charging power source having an input under-voltage protection function. The vehicle charging source having the input under-voltage protection function comprises a DC-DC power conversion circuit, an input voltage sampling circuit and a single-chip microcomputer, wherein one path of an input power source is connected with the DC-DC power conversion circuit, the other path of the input power source is connected with the input voltage sampling circuit and a reference voltage circuit, an output end of the reference voltage circuit is connected with a sixth port of the single-chip microcomputer, and a fifth port of the single-chip microcomputer outputs to the DC-DC power conversion circuit. The vehicle charging power source employs the single-chip microcomputer to carry out intelligent control, the input under-voltage protection function is realized while automatic determination on cell types is further added, different cell types correspond to different under-voltage protection points, and the vehicle charging power source can realize the input under-voltage protection function no matter which types of storage cells to which the vehicle charging power source is applied.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of car charging source of tape input under-voltage protection.
Background technology
Car charging source is to take automobile storage battery as input power, and existing car charging source does not have input undervoltage protection, and the car charging source of protecting without input undervoltage can exist the danger that makes battery overdischarge, has both affected the life of storage battery, makes again automotive ignition difficulty.
Summary of the invention
The utility model is to provide a kind of car charging source of tape input under-voltage protection.
The technical solution of the utility model is as follows: the car charging source of tape input under-voltage protection; comprise DC-DC power conversion circuit, input voltage sample circuit, single-chip microcomputer; input power one tunnel connects DC-DC power conversion circuit; another road of input power connects input voltage sample circuit and reference voltage circuit; the output of reference voltage circuit connects the 6th port of single-chip microcomputer, and the five-port of single-chip microcomputer outputs to DC-DC power conversion circuit.
DC-DC power conversion circuit comprises capacitor C 1, C2, C3, C4, DC-DC control chip, diode D2, inductance L 1, resistance R 1, R2, the negative pole of diode D1 connects the positive pole of capacitor C 1, one end of capacitor C 2, the negative pole of capacitor C 1, the other end ground connection of capacitor C 2, the negative pole of diode D1 connects the first port of DC-DC control chip, one end that the second port of DC-DC control chip connects inductance L 1 is connected with the negative pole of diode D2, the plus earth of diode D2, the 5th of DC-DC control chip, the 6th, the 7th, the 8th port ground connection, the 4th port of DC-DC control chip connects the five-port of single-chip microcomputer, the positive pole of another termination capacitor C 2 of inductance L 1, one end of capacitor C 4 and resistance R 1, the other end of L1 is voltage output end, one end ground connection of the negative pole of capacitor C 2 and capacitor C 4, one end of the other end connecting resistance R2 of resistance R 1 and the 3rd port of DC-DC control chip, the other end ground connection of resistance R 2.
Input voltage sample circuit comprises resistance R 3 and R4, and one end of resistance R 3 is connected with input power, and the first port of the other end of resistance R 3 and one end of R4, single-chip microcomputer is connected, the other end ground connection of R4.
Reference voltage circuit, comprise resistance R 7, R5 and R6, voltage stabilizing chip U3 and capacitor C 5, the output of one termination D3 of resistance R 7, one end of the other end connecting resistance R5 of resistance R 7, the negative electrode of voltage stabilizing chip U3 and a utmost point of capacitor C 5, the reference utmost point of the other end connecting resistance R6 of resistance R 5 and voltage stabilizing chip U3, the plus earth of voltage stabilizing chip U3, the other end ground connection of resistance R 6, the other end ground connection of capacitor C 5, the negative electrode of voltage stabilizing chip U3 connects the 6th port of single-chip microcomputer.The model of voltage stabilizing chip U3 is TL431.
Also comprise reverse-connection preventing circuit, it is two-way diode or two-way metal-oxide-semiconductor.
Also comprise delay reduction circuit, delay reduction circuit comprises resistance R 8 and voltage stabilizing didoe D4, the ACC circuit of one termination automobile of resistance R 8, the negative pole of another termination voltage stabilizing didoe D4 of resistance R 8, the plus earth of voltage stabilizing didoe D4, the negative electrode of voltage stabilizing didoe D4 connects the 7th port of single-chip microcomputer.
The utility model adopts single-chip microcomputer to carry out Based Intelligent Control; when realizing input undervoltage defencive function; also increased the automatic decision to battery types; different under-voltage protection point corresponding to battery types; product don't work on the storage battery of which kind of type, all can automatically realize input undervoltage defencive function.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit diagram of the present utility model;
Fig. 2 is the switching logic control chart of voltage signal and DC-DC control chip power supply.
Embodiment
As depicted in figs. 1 and 2, the car charging source of tape input under-voltage protection of the present utility model, comprises reverse-connection preventing circuit 2, DC-DC power conversion circuit 3, input voltage sample circuit 5, reference voltage circuit 6, single-chip microcomputer 7.Input power 1 is the storage battery of 12V or 24V, and reverse-connection preventing circuit 2 is for preventing input power 1 reverse-connection damage power supply, and DC-DC circuit for power conversion 3 is input power 1 to be converted to the output voltage of 5V.Input voltage sample circuit 5 is delivered to single-chip microcomputer 7 by analog signal, and AD conversion is carried out in single-chip microcomputer 7 inside, and AD changes with reference voltage as benchmark.Magnitude of voltage V after conversion and threshold value VL, the VH of two settings compare, single-chip microcomputer 7 determines that according to the residing voltage range of input power 1 after start battery types is 12V storage battery or 24V storage battery, then according to battery types, confirm two threshold value VL, VH of DC-DC control chip 4 Switching Power Supplies.Reference voltage circuit 6 provides AD conversion reference voltage for single-chip microcomputer 7.
Reverse-connection preventing circuit 2 comprises two-way diode D1, D3, and diode can replace with metal-oxide-semiconductor.The positive pole of diode D1 connects input power 1, and the negative pole of diode D1 connects DC-DC power conversion circuit 3.DC-DC power conversion circuit 3 comprises capacitor C 1, C2, C3, C4, DC-DC control chip 4, diode D2, inductance L 1, resistance R 1, R2, the negative pole of diode D1 connects the positive pole of capacitor C 1, one end of capacitor C 2, the negative pole of capacitor C 1, the other end ground connection of capacitor C 2, the negative pole of diode D1 connects the first port of DC-DC control chip 4, one end that the second port of DC-DC control chip 4 connects inductance L 1 is connected with the negative pole of diode D2, the plus earth of diode D2, the 5th of DC-DC control chip 4, the 6th, the 7th, the 8th port ground connection, the 4th port of DC-DC control chip 4 connects the five-port of single-chip microcomputer 7, the positive pole of another termination capacitor C 2 of inductance L 1, one end of capacitor C 4 and resistance R 1, the other end of inductance L 1 is voltage output end, one end ground connection of the negative pole of capacitor C 2 and capacitor C 4, one end of the other end connecting resistance R2 of resistance R 1 and the 3rd port of DC-DC control chip 4, the other end ground connection of resistance R 2.
The positive pole of the diode D3 of reverse-connection preventing circuit 2 connects input power 1, the negative pole of diode D3 connects input voltage sample circuit 5 and reference voltage circuit 6, input voltage sample circuit 5 comprises resistance R 3 and R4, one end of resistance R 3 is connected with the input of diode D3, the other end of resistance R 3 is connected with the first port of one end of R4, single-chip microcomputer 5, the other end ground connection of R4.Reference voltage circuit 6 comprises resistance R 7, R5 and R6, voltage stabilizing chip U3 and capacitor C 5, the model of voltage stabilizing chip U3 is TL431, the output of one termination D3 of resistance R 7, one end of the other end connecting resistance R5 of resistance R 7, the negative electrode of voltage stabilizing chip U3 and a utmost point of capacitor C 5, the reference utmost point of the other end connecting resistance R6 of resistance R 5 and voltage stabilizing chip U3, the plus earth of voltage stabilizing chip U3, the other end ground connection of resistance R 6, the other end ground connection of capacitor C 5, the negative electrode of voltage stabilizing chip U3 connects the 6th port of single-chip microcomputer 7.The 4th port ground connection of single-chip microcomputer 7, the five-port of single-chip microcomputer 7 outputs to the five-port of DC-DC control chip 4, controls the switch of DC-DC control chip 4 power supplys.
Also comprise delay reduction circuit 8, delay reduction circuit 8 comprises resistance R 8 and voltage stabilizing didoe D4, the ACC circuit of one termination automobile of resistance R 8, the negative pole of another termination voltage stabilizing didoe D4 of resistance R 8, the plus earth of voltage stabilizing didoe D4, the negative electrode of voltage stabilizing didoe D4 connects the 7th port of single-chip microcomputer 6.Because the storage battery of automobile is pressed in after start unstable, the opening and closing of the power supply after therefore under-voltage need to be longer time of delay, can affect test such time of delay, do not utilize batch production, delay reduction circuit provides a method of accelerating test speed, mcu programming makes when ACC inputs in certain voltage section, shorten time of delay, so just can accelerate test speed, and ACC can not drop on this voltage section in normal use, therefore such design has not only been accelerated power supply test speed but also can not have been affected normal use.The output of delay reduction circuit uses to user's electronic equipment.
Operation principle of the present utility model: after powering on, input power, through reverse-connection preventing circuit, input voltage sample circuit, is sent voltage signal V into single-chip microcomputer; Single-chip microcomputer, according to the voltage signal V sending into, judges battery types, determines after battery types, obtains two threshold value VL, VH; According to the size of voltage signal V, by the switch control logic figure of given voltage signal V and DC-DC control chip power supply, determine opening or closing of whole power supply, control signal is sent to DC-DC control chip by single-chip microcomputer, and power supply is controlled; DC-DC power conversion circuit is realized the power stage of power supply, by the voltage transitions of input power, is needed direct voltage.
Claims (7)
1. the car charging source of tape input under-voltage protection; it is characterized in that: comprise DC-DC power conversion circuit, input voltage sample circuit, single-chip microcomputer; input power one tunnel connects DC-DC power conversion circuit; another road of input power connects input voltage sample circuit and reference voltage circuit; the output of reference voltage circuit connects the 6th port of single-chip microcomputer, and the five-port of single-chip microcomputer outputs to DC-DC power conversion circuit.
2. the car charging source of tape input under-voltage protection according to claim 1, is characterized in that: DC-DC power conversion circuit comprises capacitor C 1, C2, C3, C4, DC-DC control chip, diode D2, inductance L 1, resistance R 1, R2, the negative pole of diode D1 connects the positive pole of capacitor C 1, one end of capacitor C 2, the negative pole of capacitor C 1, the other end ground connection of capacitor C 2, the negative pole of diode D1 connects the first port of DC-DC control chip, and one end that the second port of DC-DC control chip connects inductance L 1 is connected with the negative pole of diode D2, the plus earth of diode D2, the 5th of DC-DC control chip, the 6th, the 7th, the 8th port ground connection, the 4th port of DC-DC control chip connects the five-port of single-chip microcomputer, the positive pole of another termination capacitor C 2 of inductance L 1, one end of capacitor C 4 and resistance R 1, the other end of L1 is voltage output end, one end ground connection of the negative pole of capacitor C 2 and capacitor C 4, one end of the other end connecting resistance R2 of resistance R 1 and the 3rd port of DC-DC control chip, the other end ground connection of resistance R 2.
3. the car charging source of tape input under-voltage protection according to claim 1; it is characterized in that: input voltage sample circuit comprises resistance R 3 and R4; one end of resistance R 3 is connected with input power, and the first port of the other end of resistance R 3 and one end of R4, single-chip microcomputer is connected, the other end ground connection of R4.
4. the car charging source of tape input under-voltage protection according to claim 1; it is characterized in that: reference voltage circuit; comprise resistance R 7, R5 and R6, voltage stabilizing chip U3 and capacitor C 5; the output of one termination D3 of resistance R 7; one end of the other end connecting resistance R5 of resistance R 7, the negative electrode of voltage stabilizing chip U3 and a utmost point of capacitor C 5; the reference utmost point of the other end connecting resistance R6 of resistance R 5 and voltage stabilizing chip U3; the plus earth of voltage stabilizing chip U3; the other end ground connection of resistance R 6; the other end ground connection of capacitor C 5, the negative electrode of voltage stabilizing chip U3 connects the 6th port of single-chip microcomputer.
5. the car charging source of tape input under-voltage protection according to claim 4, is characterized in that: the model of voltage stabilizing chip U3 is TL431.
6. the car charging source of tape input under-voltage protection according to claim 1, is characterized in that: also comprise reverse-connection preventing circuit, it is two-way diode or two-way metal-oxide-semiconductor.
7. the car charging source of tape input under-voltage protection according to claim 1; it is characterized in that: also comprise delay reduction circuit; delay reduction circuit comprises resistance R 8 and voltage stabilizing didoe D4; the ACC circuit of one termination automobile of resistance R 8; the negative pole of another termination voltage stabilizing didoe D4 of resistance R 8; the plus earth of voltage stabilizing didoe D4, the negative electrode of voltage stabilizing didoe D4 connects the 7th port of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320650666.2U CN203522267U (en) | 2013-10-21 | 2013-10-21 | Vehicle charging power source having input under-voltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320650666.2U CN203522267U (en) | 2013-10-21 | 2013-10-21 | Vehicle charging power source having input under-voltage protection function |
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| Publication Number | Publication Date |
|---|---|
| CN203522267U true CN203522267U (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320650666.2U Expired - Fee Related CN203522267U (en) | 2013-10-21 | 2013-10-21 | Vehicle charging power source having input under-voltage protection function |
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| Country | Link |
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| CN (1) | CN203522267U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612095A (en) * | 2017-10-26 | 2018-01-19 | 汤萍萍 | Battery detecting protection circuit |
| CN110165881A (en) * | 2019-06-17 | 2019-08-23 | 北京信达众联科技有限公司 | Vehicle power supply detection and rear dress equipment protection circuit |
-
2013
- 2013-10-21 CN CN201320650666.2U patent/CN203522267U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612095A (en) * | 2017-10-26 | 2018-01-19 | 汤萍萍 | Battery detecting protection circuit |
| CN110165881A (en) * | 2019-06-17 | 2019-08-23 | 北京信达众联科技有限公司 | Vehicle power supply detection and rear dress equipment protection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20191021 |