CN209247871U - A kind of power on and off detection circuit of automobile power system - Google Patents
A kind of power on and off detection circuit of automobile power system Download PDFInfo
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- CN209247871U CN209247871U CN201821745952.6U CN201821745952U CN209247871U CN 209247871 U CN209247871 U CN 209247871U CN 201821745952 U CN201821745952 U CN 201821745952U CN 209247871 U CN209247871 U CN 209247871U
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Abstract
The utility model relates to a kind of power on and off detection circuits of automobile power system, including input circuit and output circuit, input terminal and output end are set on input circuit and output circuit, output circuit is equipped with power end, the input terminal of the output end connection output circuit of input circuit, the power end of the input terminal connection power-supply system of input circuit, the test side of the output end connection power-supply system of output circuit, input circuit includes first diode, second diode, first triode, first resistor, second resistance, 3rd resistor, first capacitor, second capacitor, output circuit includes the second triode, 4th resistance, 5th resistance, third capacitor.The design cost of this circuit is low, low in energy consumption and fast response time, and response speed can be set by adjusting the numerical value of third capacitor and the 4th resistance.
Description
Technical field
The utility model relates to automobile power system technical field more particularly to a kind of power on and off of automobile power system
Detection circuit.
Background technique
Automotive electronic technology development speed is rapid in recent years, a kind of automobile no longer only simple vehicles, with
The requirement at family is also being continuously improved, and as user requires automobile, when starting power down, there can be no any different for instrument or sound system
Often, the power on and off detection circuit of power-supply system is also come into being therewith, and the power on and off of common power-supply system detects electricity at present
Road has following several:
(1) AD digital-to-analogue converts detection circuit, and when system electrification or power down, AD samples voltage signal and gives MCU(microcontroller
Device), microcontroller judges whether it is power or power-down, and makes corresponding movement, and this circuit thinking is simply easily realized, however
Due to using MCU(microcontroller) and product cost is improved, be not suitable for the product to cost requirement harshness.And AD is sampled
With MCU(microcontroller) processing calculate will cause detection delay, cause circuit response speed slow, be only suitable for some pairs of corresponding speeds
It is required that low application scenarios.
(2) power input concatenates a diode, and connects a big capacity electrolyte capacitor in diode cathode, signal from
Diode cathode sampling, capacitor play the role of continued power during power down, do movement in next step to system and provide power supply.It is this
The capacity of electrolytic capacitor required for circuit system power consumption is bigger is bigger, and cost is very high, is only suitable for the small electricity of system power dissipation
Road application.
It (3) is to increase a voltage comparator chip, when voltage drop-out value to voltage comparator on the basis of (2)
Voltage comparator outputs level signals have fast response time, also may be implemented to power on to late-class circuit, this circuit when threshold value
Detection, but circuit cost is further improved due to increasing a voltage comparator chip.
Utility model content
The purpose of this utility model is to provide the automobile power systems of a kind of low-power consumption, low cost and fast response time
Power on and off detection circuit.
To achieve the goals above, the technical solution adopted in the utility model is that a kind of automobile power system powers on
Power detection circuit, including input circuit and output circuit are respectively provided with input terminal and output end on input circuit and output circuit, defeated
Circuit is equipped with power end, the input terminal of the output end connection output circuit of input circuit, the input terminal of input circuit and defeated out
The power end of the power end connection power-supply system of circuit out, the test side of the output end connection power-supply system of output circuit, input
Circuit include first diode, the second diode, the first triode, first resistor, second resistance, 3rd resistor, first capacitor,
Second capacitor, output circuit include the second triode, the 4th resistance, the 5th resistance, third capacitor, and the first diode is born
Pole concatenates the anode of the second diode, and branch is drawn between the cathode of first diode and the anode of the second diode as defeated
Enter the input terminal of circuit, one end of the cathode concatenation first resistor of the second diode, the first electricity of other end concatenation of first resistor
One end of appearance, the other end ground connection of first capacitor, the emitter of the first triode are connected to the cathode and first of the second diode
Between resistance, one end of the base stage connection second resistance of the first triode, the other end connection first diode of second resistance
Anode, the anode of one end connection first diode of the second capacitor, the other end ground connection of the second capacitor, the current collection of the first triode
Pole connects one end of 3rd resistor, the other end ground connection of 3rd resistor, by the company of the collector of the first triode and 3rd resistor
Connect output end of the end extraction as input circuit；Draw the input terminal as output circuit, the 4th resistance in one end of 4th resistance
The other end connect the base stage of the second triode, one end of third capacitor connects the base stage of the second triode, third capacitor it is another
One end ground connection, the emitter ground connection of the second triode, one end of the 5th resistance connects the collector of the second triode, the 5th resistance
The other end draw power end as output circuit, output end of the collector extraction of the second triode as output circuit.
As a kind of improvement of the utility model, an input circuit can connect multiple output circuits, all output electricity
It is connected in parallel between road.
As a kind of improvement of the utility model, first triode uses PNP type triode, second triode
Using NPN type triode.
As a kind of improvement of the utility model, the first capacitor, the second capacitor, third capacitor use ceramic condenser.
As a kind of improvement of the utility model, the power on and off of the power on and off detection circuit detects the response time
It can be set by adjusting the numerical value of third capacitor and the 4th resistance.
As a kind of improvement of the utility model, output of the power on and off detection circuit after power-supply system power down
The level retention time determines by first resistor and first capacitor, can be by adjusting the numerical value pair of first resistor and first capacitor
The retention time of output level of the power on and off detection circuit under power-supply system power-down conditions is set.
Compared with the existing technology, the overall construction design for the power on and off detection circuit that the utility model is proposed is ingenious,
Since circuit is to combine realization by the connection between triode, resistance, capacitor and diode, it is easily achieved and cost of manufacture
It is low, the response speed (or response time) of detection circuit can by adjust the numerical value of third capacitor and the 4th resistance in circuit into
Row setting, and the level signal for needing to export detection circuit under power-supply system power-down conditions carries out being kept for a period of time
When, which can also be set by adjusting the numerical value of first resistor and first capacitor；In addition, the one of this detection circuit
A input circuit can correspond to multiple output circuits, be connected in parallel between all output circuits, for multiple inspections of power-supply system
End is surveyed to use.
Detailed description of the invention
Fig. 1 be the utility model proposes power on and off detection circuit schematic diagram.
Specific embodiment
In order to deepen to be further described with reference to the accompanying drawing to the utility model to the understanding and cognition of the utility model
And introduction.
As shown in Figure 1, a kind of power on and off detection circuit of automobile power system, including input circuit and output circuit,
One input circuit can connect multiple output circuits, and (dotted portion as shown in figure 1) is connected in parallel between all output circuits,
It is used for multiple test sides of power-supply system.Input terminal and output end, output electricity are respectively provided on input circuit and output circuit
Road is equipped with power end, the power end of the power end connection power-supply system of output circuit, and the output end of input circuit connects output
The input terminal of circuit, the power end of the input terminal connection power-supply system of input circuit, the output end of output circuit connect power supply system
The test side of system.Input circuit includes first diode D1, the second diode D2, the first triode Q1, first resistor R1, second
Resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2, output circuit include the second triode Q2, the 4th resistance R4,
The anode of the second diode D2 of cathode concatenation of 5th resistance R5, third capacitor C3, the first diode D1, in the one or two pole
Input terminal of the branch as input circuit is drawn between the cathode of pipe D1 and the anode of the second diode D2, the second diode D2's
Cathode concatenates one end of first resistor R1, and the other end of first resistor R1 concatenates one end of first capacitor C1, first capacitor C1's
Other end ground connection, the emitter of the first triode Q1 are connected between the cathode and first resistor R1 of the second diode D2, and first
One end of the base stage connection second resistance R2 of triode Q1, the anode of the other end connection first diode D1 of second resistance R2,
The anode of one end connection first diode D1 of second capacitor C2, the other end ground connection of the second capacitor C2, the first triode Q1's
Collector connects one end of 3rd resistor R3, the other end ground connection of 3rd resistor R3, by the collector of the first triode Q1 and the
Draw the output end as input circuit in the connecting pin of three resistance R3；It draws as the defeated of output circuit one end of 4th resistance R4
Enter end, the other end of the 4th resistance R4 connects the base stage of the second triode Q2, and one end of third capacitor C3 connects the second triode
The base stage of Q2, the other end ground connection of third capacitor C3, the emitter ground connection of the second triode Q2, one end connection of the 5th resistance R5
The collector of second triode Q2, the other end of the 5th resistance R5 draw the power end as output circuit, the second triode Q2
Collector draw output end as output circuit.
When power-supply system powers on, electric current passes through the second diode D2, the pole CE of the first triode Q1 and second resistance R2
It charges to the second capacitor C2, generates electric current IB1, when the first triode Q1 meets turn-on condition, generate electric current IC1 and flow through third
Resistance R3 and the 4th resistance R4 drives the second triode Q2 conducting, and the collector of the second triode Q2 exports low level and gives rear class electricity
Road.
And in power-supply system power down, supply voltage drops below the PN section of the first triode Q1 and first diode D1
When the sum of conducting voltage, the first triode Q1 conducting, the second diode D2 ends, at this time the emitter power supply of the first triode Q1
It is discharged and is provided by first capacitor C1, the collector of the second triode Q2 exports low level to late-class circuit.
Specifically, the first triode Q1 uses PNP type triode, the second triode Q2 uses three pole of NPN type
Pipe.The first capacitor C1, the second capacitor C2, third capacitor C3 use ceramic condenser.
Preferably, the power on and off detection response time of the power on and off detection circuit can be by adjusting third electricity
The numerical value for holding C3 and the 4th resistance R4 is set.The calculation formula of response time is specific as follows:
Power-supply system power down powered on moment 3rd resistor R3 both end voltage are as follows: VR3=VA-VD2-VQ1EC, wherein VA
For input input circuit input terminal and the supply voltage of output circuit power end, VD2 is forward direction when the second diode D2 is connected
Pressure difference, VQ1EC are the voltage at the pole EC both ends when the first triode Q1 is connected.
Third capacitor C3 charge and discharge equation are as follows: VQ2BE=I*t*/C3, when wherein VQ2BE triode Q2 is connected between BE
Voltage difference；
Third capacitor C3 charge and discharge average current are as follows: I=((VR3- UQ2BE)/R4+VR3/R4)/2；
The voltage of third capacitor C3 is charged to the time of UQ2BE, i.e., when power down powers on, the response time of circuit from 0V are as follows: and t=
UQ2BE*C3/I；
Therefore, the response time of power on and off can further indicate that are as follows: t=UQ2BE*C3/((VR3- UQ2BE)/R4+
VR3/R4)/2, it can be seen that, since VA, VD2, VQ1EC are definite value, response time of power on and off by third capacitor C3 and
The numerical value of 4th resistance R4 determines, by adjusting the numerical value of third capacitor C3 and the 4th resistance R4, the response of adjustable circuit
Speed can satisfy the response effect synchronous with the porch that power on and off generates.
It is further preferred that output level retention time of the power on and off detection circuit after power-supply system power down
It is determined by first resistor R1 and first capacitor C1, it can be by adjusting the numerical value of first resistor R1 and first capacitor C1 to powering on
The retention time of output level of the power-fail detection circuit under power-supply system power-down conditions is set.
Require after power down circuit that can export low level t1(i.e. retention time for a period of time always in some special applications),
This time is determined by first resistor R1 and first capacitor C1, when first capacitor C1 Voltage Drop to make VR3 be equal to VQ2BE
When circuit stop working, the voltage of first capacitor C1 is set as VC1L at this time, and first capacitor C1 discharges into the time of VC1L i.e. from VA
For t1, specific formula for calculation is as follows:
When circuit stops working, VC1L calculation formula are as follows: VC1L=VQ2BE+VD2+VQ1EC；
The energy that first capacitor C1 voltage stores when being VA: E1=0.5*C1*VA^2(units of joules)；
The energy that first capacitor C1 voltage stores when being VC1L: E2=0.5*C1* VC1L ^2(units of joules)；
The power that first capacitor C1 is consumed when discharging: P=(VA-VC1L)/R1(unit watt)；
When first capacitor C1 voltage is discharged into VC1L from VA, the required time: t1=(E1-E2)/P.
For example, power supply electrifying and power down can make power amplifier export DC pulse signal in audio power amplification system, lead to loudspeaker
Noise is issued, so audio frequency power amplifier when electric power down on an audio system is needed to be in mute state.Therefore, by the application of this circuit
When in the power on and off mute circuit of sound equipment power-supply system, it can be set by adjusting the value of first resistor R1 and first capacitor C1
Determine the first triode Q1 turn-on time after power down, the mute requirement of power down to meet circuit.Specifically by all inputs of this circuit
The power supply of Vin connection power amplifier, the mute input (the mute low level of power amplifier is effective) of all output Vout connection power amplifiers, works as electricity
When the power on and off of source, this detection circuit output low level makes audio frequency power amplifier be in mute state, shields because of system electrification power down
The noise of generation.
Technological means disclosed in the utility model is not limited only to technological means disclosed in above embodiment, also
Including technical solution consisting of any combination of the above technical features.It should be pointed out that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (6)
1. a kind of power on and off detection circuit of automobile power system, it is characterised in that: defeated including input circuit and output circuit
Enter and be respectively provided with input terminal and output end on circuit and output circuit, output circuit is equipped with power end, the output end of input circuit
The input terminal of output circuit, the power end of the input terminal connection power-supply system of input circuit are connected, the output end of output circuit connects
The test side of power-supply system is connect, input circuit includes first diode, the second diode, the first triode, first resistor, second
Resistance, 3rd resistor, first capacitor, the second capacitor, output circuit include the second triode, the 4th resistance, the 5th resistance, third
Capacitor, the cathode of the first diode concatenates the anode of the second diode, in the cathode and the second diode of first diode
Anode between draw input terminal of the branch as input circuit, the cathode of the second diode concatenates one end of first resistor, the
One end of the other end concatenation first capacitor of one resistance, the other end ground connection of first capacitor, the emitter connection of the first triode
Between the cathode and first resistor of the second diode, one end of the base stage connection second resistance of the first triode, second resistance
The other end connection first diode anode, the second capacitor one end connection first diode anode, the second capacitor it is another
One end ground connection, one end of the collector connection 3rd resistor of the first triode, the other end ground connection of 3rd resistor, by the one or three pole
The output end as input circuit is drawn in the collector of pipe and the connecting pin of 3rd resistor；It draws as defeated one end of 4th resistance
The input terminal of circuit out, the other end of the 4th resistance connect the base stage of the second triode, one end connection the two or three of third capacitor
The base stage of pole pipe, the other end ground connection of third capacitor, the emitter ground connection of the second triode, one end connection second of the 5th resistance
The collector of triode, the other end of the 5th resistance draw the power end as output circuit, and the collector of the second triode draws
Out as the output end of output circuit.
2. a kind of power on and off detection circuit of automobile power system as described in claim 1, which is characterized in that an input
Circuit can connect multiple output circuits, be connected in parallel between all output circuits.
3. a kind of power on and off detection circuit of automobile power system as claimed in claim 2, which is characterized in that described first
Triode uses PNP type triode, and second triode uses NPN type triode.
4. a kind of power on and off detection circuit of automobile power system as claimed in claim 3, which is characterized in that described first
Capacitor, the second capacitor, third capacitor use ceramic condenser.
5. a kind of power on and off detection circuit of automobile power system as claimed in claim 4, which is characterized in that described is upper
The power on and off detection response time of electric power-fail detection circuit can carry out by adjusting the numerical value of third capacitor and the 4th resistance
Setting.
6. a kind of power on and off detection circuit of automobile power system as claimed in claim 5, which is characterized in that power on
The retention time of output level of the power detection circuit under power-supply system power-down conditions can be by adjusting first resistor and first
The numerical value of capacitor is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821745952.6U CN209247871U (en) | 2018-10-26 | 2018-10-26 | A kind of power on and off detection circuit of automobile power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821745952.6U CN209247871U (en) | 2018-10-26 | 2018-10-26 | A kind of power on and off detection circuit of automobile power system |
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| Publication Number | Publication Date |
|---|---|
| CN209247871U true CN209247871U (en) | 2019-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821745952.6U Expired - Fee Related CN209247871U (en) | 2018-10-26 | 2018-10-26 | A kind of power on and off detection circuit of automobile power system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239445A (en) * | 2018-10-26 | 2019-01-18 | 延锋伟世通电子科技（南京）有限公司 | A kind of power on and off detection circuit of automobile power system |
| CN116087665A (en) * | 2023-02-23 | 2023-05-09 | 上海陆芯电子科技有限公司 | Aging test system and device |
-
2018
- 2018-10-26 CN CN201821745952.6U patent/CN209247871U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239445A (en) * | 2018-10-26 | 2019-01-18 | 延锋伟世通电子科技（南京）有限公司 | A kind of power on and off detection circuit of automobile power system |
| CN109239445B (en) * | 2018-10-26 | 2024-05-17 | 延锋伟世通电子科技（南京）有限公司 | Power-on and power-off detection circuit of automobile power supply system |
| CN116087665A (en) * | 2023-02-23 | 2023-05-09 | 上海陆芯电子科技有限公司 | Aging test system and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191111 Address after: No. 19 Fenghuang Avenue, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province, 221000 Patentee after: JIANGSU TOPPOWER AUTOMOTIVE ELECTRONICS Co.,Ltd. Address before: 211100, building 7, block C1, 19 Su Sheng Avenue, Jiangning District, Jiangsu, Nanjing Patentee before: YANFENG VISTEON ELECTRONIC TECHNOLOGY (NANJING) Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |