CN206440809U - A kind of detection circuit of startup power supply - Google Patents
A kind of detection circuit of startup power supply Download PDFInfo
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- CN206440809U CN206440809U CN201720082830.2U CN201720082830U CN206440809U CN 206440809 U CN206440809 U CN 206440809U CN 201720082830 U CN201720082830 U CN 201720082830U CN 206440809 U CN206440809 U CN 206440809U
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Abstract
The utility model discloses a kind of detection circuit of startup power supply, including temperature detection branch road, supply voltage detection branch and A/D converter；In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V VDD), and thermistor RT1 connects with resistance R22, resistance R22 ground connection；Thermistor RT1 and resistance R22 tie point (V07) connects the first input end of analog signal mouthful (AN1) of A/D converter；In supply voltage detection branch, resistance R66 and R67 ground connection of the supply voltage Vbout+ through being sequentially connected in series；Resistance R66 and R67 tie point (V06) connect the second input end of analog signal mouthful (AN2) of A/D converter.The detection circuit of the startup power supply detects that integrated level is high, simple circuit, it is easy to implement using the A/D converter of multiple input path to voltage signal, and accuracy of detection is high.
Description
Technical field
The detection circuit of more particularly to a kind of startup power supply of the utility model.
Background technology
In the charging process of automobile starting power supply, easily because temperature is too high to damage battery and circuit board, it is also desirable in real time
Each voltage is monitored, so as to ensure the security of power supply, therefore, it is necessary to design a kind of detection circuit of startup power supply.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of detection circuit of startup power supply, the startup power supply
Detection circuit detects that integrated level is high, simple circuit using the A/D converter of multiple input path to voltage signal, it is easy to real
Apply, accuracy of detection is high.
The technical solution of utility model is as follows：
A kind of detection circuit of startup power supply, including temperature detection branch road, supply voltage detection branch and A/D converter；
Described A/D converter is multi-channel a/d converter；The output end output testing result data of A/D converter；
In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V-VDD), thermistor RT1 and resistance R22
Series connection, resistance R22 ground connection；The first analog signal that thermistor RT1 and resistance R22 tie point (V07) connects A/D converter is defeated
Inbound port (AN1)；
In supply voltage detection branch, supply voltage Vbout+ (is used to connect automobile batteries) the resistance R66 through being sequentially connected in series
With R67 ground connection；Resistance R66 and R67 tie point (V06) connect the second input end of analog signal mouthful (AN2) of A/D converter.
The detection circuit of described startup power supply also includes energy-storage module voltage detecting branch road；
In energy-storage module voltage detecting branch road, energy-storage module voltage BAT+ (being used for the positive terminal for connecing energy-storage module) is through successively
Resistance R74 and the R75 ground connection of concatenation；Resistance R74 and R75 tie point (V08) connect the 3rd analog signal input of A/D converter
Port (AN0).
The detection circuit of described startup power supply also includes switch detection branch；Switch in detection branch, supply voltage
The resistance R89 of (5V-VDD) through being sequentially connected in series, switch SW1 and resistance R21 ground connection；Resistance R89 and switch SW1 tie point
(CLK) clock signal terminal (CLK/P2.1) of A/D converter is connect.
The model SC8F2712 of described A/D converter；Thermistor RT1 resistance is 10K ohm；Resistance R22,
R66, R67, R74, R75, R89 and R21 resistance value are respectively 10K, 100K, 100K, 301K, 100K, 1M and 100K, and unit is
Ohm.
Resistance R22 is parallel with electric capacity C9.
Electric capacity C9 capacitance is 0.1uF.
Resistance R67 is parallel with electric capacity C48.
Electric capacity C48 capacitance is 0.1uF.
SW1, which presses rear CLK voltages, will produce transfer, and this low and high level variable signal is directly delivered to MCU, perform specific
Function, such as trigger relay realizes electric discharge, and the clock signal of chip internal is generated or other outside pins by chip oneself
There is provided.
U4 inherently MCU, therefore, ADC transformation result are supplied to the MCU in U4 by internal circuit (or register)
Module.
Beneficial effect：
The detection circuit of startup power supply of the present utility model, is believed plurality of voltages using the A/D converter of multiple input path
Number detected, moreover it is possible to realize monitoring temperature subsequently to realize overtemperature protection, integrated level is high in addition, simple circuit, it is easy to real
Apply, accuracy of detection is high, technical ensure can be provided for the trouble free service of automobile starting power supply.
Brief description of the drawings
Fig. 1 is the schematic diagram of dual input power supply circuit；
Fig. 2 is the schematic diagram of the accumulator of portable power source；
Fig. 3 is the schematic diagram of detection branch；
Fig. 4 is the schematic diagram of A/D converter.
Embodiment
For the ease of understanding the utility model, below in conjunction with Figure of description and preferred embodiment to practical new herein
Type, which is done, more comprehensively, meticulously to be described, but protection domain of the present utility model is not limited to specific embodiment.
Unless otherwise defined, all technical terms used hereinafter are generally understood that implication phase with those skilled in the art
Together.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to and limits this practicality newly
The protection domain of type.
Embodiment 1：
Fig. 3~4, a kind of detection circuit of startup power supply, including temperature detection branch road, supply voltage detection branch and A/D
Converter；Described A/D converter is multi-channel a/d converter；The output end output testing result data of A/D converter；
In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V-VDD), thermistor RT1 and resistance R22
Series connection, resistance R22 ground connection；The first analog signal that thermistor RT1 and resistance R22 tie point (V07) connects A/D converter is defeated
Inbound port (AN1)；
In supply voltage detection branch, supply voltage Vbout+ (is used to connect automobile batteries) the resistance R66 through being sequentially connected in series
With R67 ground connection；Resistance R66 and R67 tie point (V06) connect the second input end of analog signal mouthful (AN2) of A/D converter.
The detection circuit of described startup power supply also includes energy-storage module voltage detecting branch road；
In energy-storage module voltage detecting branch road, energy-storage module voltage BAT+ (being used for the positive terminal for connecing energy-storage module) is through successively
Resistance R74 and the R75 ground connection of concatenation；Resistance R74 and R75 tie point (V08) connect the 3rd analog signal input of A/D converter
Port (AN0).
The detection circuit of described startup power supply also includes switch detection branch；Switch in detection branch, supply voltage
The resistance R89 of (5V-VDD) through being sequentially connected in series, switch SW1 and resistance R21 ground connection；Resistance R89 and switch SW1 tie point
(CLK) clock signal terminal (CLK/P2.1) of A/D converter is connect.
The model SC8F2712 of described A/D converter；Thermistor RT1 resistance is 10K ohm；Resistance R22,
R66, R67, R74, R75, R89 and R21 resistance value are respectively 10K, 100K, 100K, 301K, 100K, 1M and 100K, and unit is
Ohm.
Such as Fig. 1, power supply circuit includes the first power input (VBOUT+), second source input (VCC-BAT), two poles
Pipe, voltage-stablizer and power output end (5V-VDD)；
First power input is used to connect with the positive pole of automobile batteries；
Second source input is used for the positive pole for connecing dry cell batteries；Dry cell batteries include three section dry cells, often save 1.5V, defeated
Go out for 4.5V；
First power input connects the input of voltage-stablizer through diode；Second source input connects voltage-stablizer through diode
Input；
The output end of voltage-stablizer is power output end；The output end of voltage-stablizer exports 3.3~5V DC voltage.
Described diode is BAT54CW type Schottky-barrier diodes.
Described voltage-stablizer is ME6119A33PG type voltage-stablizers.
The input of voltage-stablizer is provided with electrochemical capacitor (C40)；The input and output of voltage-stablizer are also respectively connected to one
Non-electrolytic capacitor (C37 and C51)；The capacitance of described electrochemical capacitor is 47uF, and the capacitance of described non-electrolytic capacitor is
0.1uF。
Power circuit is using 2 power inputs, and one connects automobile batteries (such as connecing battery by cigar lighter socket), one
Connect dry cell batteries, be particularly suitable for it is vehicle-mounted use, wireless communication electricity can for portable power source energy-storage module charge.
In addition, using BAT54CW type Schottky-barrier diodes, forward voltage drop is low (because schottky barrier height is less than
PN junction barrier height, therefore its forward conduction threshold voltage and forward voltage drop are all lower than PN junction diode (about low 0.2V)), due to
SBD (Schottky-barrier diode) is a kind of majority carrier conductive devices, in the absence of minority carrier lifetime and Reverse recovery
Problem.SBD reverse recovery time is the charge and discharge time of Schottky barrier electric capacity, is totally different from PN junction diode
Reverse recovery time.Because SBD QRR is considerably less, therefore switching speed is very fast, and switching loss is also especially small, especially
It is suitable for frequency applications.SBD structure and feature makes it suitable for being used as high-frequency rectification in low pressure, High-current output occasion.
Further, the ME6119A33PG types voltage-stablizer that voltage-stablizer is used is the adjustable master-hand's LDO voltage stabilizer of input voltage
(400mAAdjustable Voltage High Speed LDO Regulators), output voltage is accurate, input voltage range
For 2.5~18V；Using being particularly suitable for here, it can not only be charged by booster circuit for energy-storage module, moreover it is possible to be used as benchmark
Voltage is used in temperature sensing circuit.
Therefore, the input voltage of this compatible wide scope of power circuit energy, is widely used, and can be filled without alternating current
Electricity, circuit working stability is practical.
Such as Fig. 2, the energy-storage module of portable power source includes 5 super capacitors (C1, C2, C3, C4 and C7) of series connection；Each surpasses
The capacitance of level electric capacity is 350F；The energy-storage module using lithium ion battery is totally different from, it is safe using super capacitor,
The risk do not exploded, and service life is long；The effect of 4 sockets (J45, J11, J11, J18) in circuit is that overstriking is led
Electrical circuit；Because typical case's application of the power supply is to provide automobile starting electric current, electric current is big, and overstriking galvanic circle can effectively be protected
Device and circuit board.Each super capacitor is parallel with a voltage stabilizing branch road, and voltage stabilizing branch routing resistance and voltage-stabiliser tube are in series,
The resistance of resistance is 1 ohm, the model MMSZS223BT1 of voltage-stabiliser tube.Using super capacitor as energy-storage module, with using
Long lifespan, the characteristics of safe.
Claims (10)
1. the detection circuit of a kind of startup power supply, it is characterised in that including temperature detection branch road, supply voltage detection branch and A/
D converters；Described A/D converter is multi-channel a/d converter；The output end output testing result data of A/D converter；
In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V-VDD), and thermistor RT1 and resistance R22 goes here and there
Connection, resistance R22 ground connection；The first analog signal that thermistor RT1 and resistance R22 tie point (V07) connects A/D converter is inputted
Port (AN1)；
In supply voltage detection branch, resistance R66 and R67 ground connection of the supply voltage Vbout+ through being sequentially connected in series；Resistance R66 and
R67 tie point (V06) connects the second input end of analog signal mouthful (AN2) of A/D converter.
2. the detection circuit of startup power supply according to claim 1, it is characterised in that also including energy-storage module voltage detecting
Branch road；
In energy-storage module voltage detecting branch road, resistance R74 and R75 ground connection of the energy-storage module voltage BAT+ through being sequentially connected in series；Resistance
R74 and R75 tie point (V08) connects the 3rd input end of analog signal mouthful (AN0) of A/D converter.
3. the detection circuit of startup power supply according to claim 2, it is characterised in that also including switch detection branch；Open
Close in detection branch, resistance R89 of the supply voltage (5V-VDD) through being sequentially connected in series, switch SW1 and resistance R21 ground connection；Resistance R89
The clock signal terminal (CLK/P2.1) of A/D converter is connect with switch SW1 tie point (CLK).
4. the detection circuit of startup power supply according to claim 3, it is characterised in that the model of described A/D converter
For SC8F2712.
5. the detection circuit of the startup power supply according to claim any one of 1-4, it is characterised in that thermistor RT1's
Resistance is 10K ohm.
6. the detection circuit of startup power supply according to claim 5, it is characterised in that resistance R22, R66, R67, R74,
R75, R89 and R21 resistance value are respectively 10K, 100K, 100K, 301K, 100K, 1M and 100K, and unit is ohm.
7. the detection circuit of startup power supply according to claim 1, it is characterised in that resistance R22 is parallel with electric capacity C9.
8. the detection circuit of startup power supply according to claim 7, it is characterised in that electric capacity C9 capacitance is 0.1uF.
9. the detection circuit of startup power supply according to claim 1, it is characterised in that resistance R67 is parallel with electric capacity C48.
10. the detection circuit of startup power supply according to claim 9, it is characterised in that electric capacity C48 capacitance is
0.1uF。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720082830.2U CN206440809U (en) | 2017-01-22 | 2017-01-22 | A kind of detection circuit of startup power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720082830.2U CN206440809U (en) | 2017-01-22 | 2017-01-22 | A kind of detection circuit of startup power supply |
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| CN206440809U true CN206440809U (en) | 2017-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736933A (en) * | 2019-10-22 | 2020-01-31 | 四川甘华电源科技有限公司 | digital power supply output voltage under-voltage detection method |
-
2017
- 2017-01-22 CN CN201720082830.2U patent/CN206440809U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736933A (en) * | 2019-10-22 | 2020-01-31 | 四川甘华电源科技有限公司 | digital power supply output voltage under-voltage detection method |
| CN110736933B (en) * | 2019-10-22 | 2021-07-20 | 四川甘华电源科技有限公司 | Digital power supply output voltage under-voltage detection method |
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