CN207303981U - A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control - Google Patents
A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control Download PDFInfo
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- CN207303981U CN207303981U CN201720896626.4U CN201720896626U CN207303981U CN 207303981 U CN207303981 U CN 207303981U CN 201720896626 U CN201720896626 U CN 201720896626U CN 207303981 U CN207303981 U CN 207303981U
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Abstract
The utility model technology discloses a kind of vehicle carried mobile phone charger output protection circuit of MCU chip control; including MCU chip power supply circuit, current collection circuit, voltage collection circuit, contactor control circuit; the MCU power supply circuits include 3 voltage stabilizing IC U3 of SOT23, filter capacitor C12, MCU chip U2; the current collection circuit includes resistance R1, MCU chip U2; the voltage collection circuit includes R7 and R8 resistance, MCU chip U2, and the contactor control circuit includes Q3NMOS pipes, MCU chip U2；MCU chip exceeds safety value by resistance detection to output current or voltage, is switched by ADC output control anode NMOS tube, cuts off the output of onboard charger, and the not impaired effect of charging equipment is protected in realization.
Description
Technical field
This technology is a kind of a kind of output protection applied on vehicle carried mobile phone charger product based on MCU chip exploitation
Circuit.
Background technology
With being continuously increased for intelligent mobile phone battery capacity, the input current of mobile phone is by 0.5A and 1A universal before 2011
Rise between 2A to 5A in 2017, in addition the high current mobile phone for thering is an other manufacturer to have developed 8A, the input voltage of mobile phone
Also between rising to 5V to the 12V of 2017 by 5V universal before 2011, the raising of mobile phone input current and voltage, vehicle-mounted hand
Machine charger charges the phone the probability for security risk occur and also significantly improves, and product design does not have enough safeguard protections
Measure, it is easy to the phenomenon for burning out cell phone charging circuit occur；
At present the BUCK types of mainstream and PMU type vehicle carried mobile phone charger voltage dropping power supplies managing chip some there is no overcurrent
Or overvoltage protection design, some can do the design protection of overcurrent and overvoltage, but smart mobile phone manufacturer develops into 2017
Year does not all establish unified safe current and voltage standard, can count on the mobile phone safe electricity of the cell phone manufacturer of the market mainstream
Stream and voltage standard are just more than 10 kinds, and based on this technical background, vehicle carried mobile phone charger increases a kind of independent output current
It is necessary with voltage protection circuit；
MCU chip can set the electric current and voltage protection numerical value of safety according to different mobile phone safe electric currents and voltage,
There is no output protection either output protection standard and mobile phone is inconsistent or because temperature etc. can not in voltage dropping power supply managing chip
In the case that control reason causes the failure of voltage dropping power supply managing chip over-current over-voltage protection, the output of independent MCU chip control is protected
The probability that vehicle carried mobile phone charger burns out cell phone charging circuit can be greatly lowered in protection circuit.
The content of the invention
The purpose of this utility model is to provide it is a kind of it is simple in structure, can effectively solve the problem that vehicle carried mobile phone charger is charging
During because high pressure and high current burn out the overcurrent and overvoltage crowbar of mobile phone, to solve what is proposed in above-mentioned technical background
Problem.
To achieve the above object, the utility model provides following technical solution：
A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control, including MCU chip power supply circuit, electric current
Acquisition Circuit, voltage collection circuit, contactor control circuit, the MCU power supply circuits include SOT23-3 voltage stabilizings IC U3, filter
Ripple capacitance C12, MCU chip U2, the current collection circuit include resistance R1, MCU chip U2, and the voltage collection circuit includes
R7 and R8 resistance, MCU chip U2, the contactor control circuit include Q3NMOS pipes, MCU chip U2；
SOT23-3 voltage stabilizings IC U3 one end ground connection connects the Pin1 pins and filter capacitor of U2 with input circuit one end
The Pin1 pins and Pin8 pins of C12, filter capacitor C12 connection MUC chips U2, SOT23-3 give MCU new products by filter capacitor
The operating current of burning voltage is provided；Described resistance R1 one end is grounded the Pin5 pins of one end connection U2 positions MCU chip, detection
To the numeric feedback of output current to MCU chip；Described R7 with R8 resistance one end is grounded one end and connects U2 positions MCU chip
Pin6 pins, detect the numeric feedback of output voltage to MCU chip；The Q3 anode NMOS tube connection U2 positions MCU chip
Pin7 pins, the numerical value that MCU chip receives output voltage or electric current passes on instruction to NMOS after setting safety value
Pipe closes defencive function of the output function realization to charging equipment of vehicle carried mobile phone charger；
After MCU chip detects that output current exceedes safety value, switched by ADC output control anode NMOS tube, cut-out
The not impaired effect of charging equipment is protected in the output of vehicle carried mobile phone charger, realization；
After MCU chip detects that output voltage exceedes safety value, switched by ADC output control anode NMOS tube, cut-out
The not impaired effect of charging equipment is protected in the output of vehicle carried mobile phone charger, realization；
The beneficial effects of the utility model are：MCU chip can be according to different mobile phone safe electric currents and voltage setting peace
Full electric current and voltage protection numerical value, does not have output protection or output protection standard and mobile phone not in voltage dropping power supply managing chip
In the case of unanimously or causing the failure of voltage dropping power supply managing chip over-current over-voltage protection because of uncontrollable reasons such as temperature, solely
The output protection circuit of vertical MCU chip control can be greatly lowered vehicle carried mobile phone charger and burn out cell phone charging circuit
Probability.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of the PMU voltage dropping power supply managing chips of vehicle carried mobile phone charger；
Fig. 2 is the vehicle carried mobile phone charger output protection electricity for having increased MCU chip control newly with PMU voltage dropping power supply managing chips
The circuit diagram on road.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment, based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
By indivedual component specifications and the change all other embodiments obtained of quantity, the model that the utility model is protected is belonged to
Enclose；
Referring to Fig. 2, a kind of onboard charger output protection circuit of MCU chip control in the utility model embodiment,
Including MCU chip power supply circuit, current collection circuit, voltage collection circuit, contactor control circuit, the MCU power supplies electricity
Road includes SOT23-3 voltage stabilizings IC U3, filter capacitor C12, MCU chip U2, and the current collection circuit includes resistance R1, MCU core
Piece U2, the voltage collection circuit include R7 and R8 resistance, MCU chip U2, and the contactor control circuit includes Q3NMOS
Pipe, MCU chip U2；
SOT23-3 voltage stabilizings IC U3 one end ground connection connects the Pin1 pins and filter capacitor of U2 with input circuit one end
The Pin1 pins and Pin8 pins of C12, filter capacitor C12 connection MUC chips U2, SOT23-3 give MCU new products by filter capacitor
The operating current of burning voltage is provided；Described resistance R1 one end is grounded the Pin5 pins of one end connection U2 positions MCU chip, detection
To the numeric feedback of output current to MCU chip；Described R7 with R8 resistance one end is grounded one end and connects U2 positions MCU chip
Pin6 pins, detect the numeric feedback of output voltage to MCU chip；The Q3 anode NMOS tube connection U2 positions MCU chip
Pin7 pins, the numerical value that MCU chip receives output voltage or electric current passes on instruction to NMOS after setting safety value
Pipe closes defencive function of the output function realization to charging equipment of onboard charger；Based on PMU voltage dropping power supply managing chips
The application of (EDP3016O Fig. 1) vehicle carried mobile phone charger, as shown in Fig. 2, connected partial pressure by R7, R8, the of microcontroller U2
6pin may determine that the magnitude of voltage VOUT of USB outputs by AD samplings, so as to fulfill the function of overvoltage protection, it is assumed that output voltage
When VOUT is more than 5.5v, overvoltage protection comes into force, and is calculated by 8 AD of microcontroller, internal reference voltage for 2v. microcontrollers again
It is Vad=VOUT/ (R7+R8) * R8=5.5V/ (180k Ω+13k Ω) * 13k that USB outputs, which are equal to the magnitude of voltage that 5.5v is sampled,
The AD values of the 6pin of Ω=0.37v. microcontrollers U2 are ADB1=Vad1/2v*256=0.37v/2v*256 ≈ 47.U2 softwares
Set when the AD input values of 6pin are more than or equal to 47, U2 7pin export 0 level, control Q3 (nmos closings) cut-outs USB
Anode exports.Q3 conducting USB anode outputs whether are opened to rejudge, then u2, which needs to re-power, initializes and could give birth to
Effect, is plugged again by car charging source in cigarette lighter outlet.So effectively realize over-voltage protecting function.Pass through U2 the at the same time
Output current Iout is detected 5pin CSP, it can be achieved that overcurrent protection function energy, USB output currents pass through R1=0.01 Ω
Resistance is sampled.Assuming that USB electric currents Iout output 4A protections (U2 7pin export 0 level), microcontroller U2 5pin are set
Magnitude of voltage Vad2=R1*4A=0.01 Ω * 4A=0.04V, AD value is ADB2=Vad2/2v*256=0.37v/2v*256 ≈ 5,
When setting the AD input values of 5pin to be more than or equal to 5, U2 7pin export 0 level, control Q3 (nmos closings) cut-out USB anode
Output.Whether to open Q3 conducting USB anode outputs to rejudge, then u2 is needed to re-power to initialize and can just come into force,
Plugged again in cigarette lighter outlet by car charging source.So effectively realize over-voltage protecting function；
Detected by monolithic machine testing USB output voltages, ADC output control USB metal-oxide-semiconductors switch, cut-out has exported USB
Output over-voltage protection acts on；
By monolithic machine testing USB output current sample detectings, ADC output control USB metal-oxide-semiconductors switch, cut-out exports
To overcurrent protection.
Claims (3)
1. a kind of vehicle carried mobile phone charger output protection circuit of MCU chip control, including MCU chip power supply circuit, electric current are adopted
Collector, voltage collection circuit, contactor control circuit, the MCU power supply circuits include SOT23-3 voltage stabilizings IC U3, filtering
Capacitance C12, MCU chip U2, the current collection circuit include resistance R1, MCU chip U2, and the voltage collection circuit includes R7
With R8 resistance, MCU chip U2, the contactor control circuit includes Q3 NMOS tubes, MCU chip U2;
SOT23-3 voltage stabilizings IC U3 one end ground connection connects the Pin1 pins and filter capacitor C12 of U2 with input circuit one end,
The Pin1 pins and Pin8 pins of filter capacitor C12 connection MUC chips U2, SOT23-3 voltage stabilizings IC is by filter capacitor to MCU core
Piece provides the operating current of burning voltage；Described resistance R1 one end is grounded the Pin5 pins of one end connection U2 positions MCU chip, inspection
The numeric feedback of output current is measured to MCU chip；Described R7 with R8 resistance one end is grounded one end and connects U2 positions MCU chip
Pin6 pins, detect the numeric feedback of output voltage to MCU chip；The Q3 anode NMOS tube connection U2 positions MCU chip
Pin7 pins, the numerical value that MCU chip receives output voltage or electric current passes on instruction to give Q3 positions after setting safety value
NMOS tube closes defencive function of the output function realization to charging equipment of onboard charger.
2. the vehicle carried mobile phone charger output protection circuit of MCU chip control according to claim 1, it is characterised in that institute
State MCU chip and detect that output current more than after safety value, is switched by ADC output control anode NMOS tube, cuts off vehicle-mounted hand
The not impaired effect of charging equipment is protected in the output of machine charger, realization.
3. the vehicle carried mobile phone charger output protection circuit of MCU chip control according to claim 1, it is characterised in that institute
State MCU chip and detect that output voltage more than after safety value, is switched by ADC output control anode NMOS tube, cuts off vehicle-mounted hand
The not impaired effect of charging equipment is protected in the output of machine charger, realization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720896626.4U CN207303981U (en) | 2017-07-24 | 2017-07-24 | A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720896626.4U CN207303981U (en) | 2017-07-24 | 2017-07-24 | A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control |
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| CN207303981U true CN207303981U (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720896626.4U Expired - Fee Related CN207303981U (en) | 2017-07-24 | 2017-07-24 | A kind of vehicle carried mobile phone charger output protection circuit of MCU chip control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653205A (en) * | 2020-10-09 | 2021-04-13 | 合肥恒烁半导体有限公司 | Vehicle-mounted mobile phone charger output protection circuit controlled by MCU chip |
-
2017
- 2017-07-24 CN CN201720896626.4U patent/CN207303981U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653205A (en) * | 2020-10-09 | 2021-04-13 | 合肥恒烁半导体有限公司 | Vehicle-mounted mobile phone charger output protection circuit controlled by MCU chip |
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Granted publication date: 20180501 |
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| CF01 | Termination of patent right due to non-payment of annual fee |