CN108880215A - A kind of DC-DC power source low pressure switches off control circuit - Google Patents
A kind of DC-DC power source low pressure switches off control circuit Download PDFInfo
- Publication number
- CN108880215A CN108880215A CN201710338359.3A CN201710338359A CN108880215A CN 108880215 A CN108880215 A CN 108880215A CN 201710338359 A CN201710338359 A CN 201710338359A CN 108880215 A CN108880215 A CN 108880215A
- Authority
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- China
- Prior art keywords
- circuit
- power source
- low pressure
- power supply
- voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
Abstract
The invention discloses a kind of DC-DC power source low pressure to switch off control circuit,Including power supply chip,Voltage detecting circuit,Start-up circuit,CPU and low pressure breaking circuit,The input of the power supply chip terminates main power source,Its output end is respectively CPU and power supply for electrical equipment,The CPU detects the voltage value of main power source by voltage detecting circuit,When the voltage value for detecting main power source is less than preset shutdown electrical voltage point,It exports control signal and gives low pressure breaking circuit,Low pressure breaking circuit stops working according to control signal control power supply chip,The first input end of the start-up circuit connects the output end of main power source,Its enable end for exporting termination power supply chip,The voltage value of the start-up circuit detection main power source,When the main power voltage value detected is greater than default starting electrical voltage point,The start-up circuit control power supply chip work.The present invention can eliminate power supply chip window region itself, while realize the stability contorting under different temperatures working environment to switching voltage by temperature-compensating means.
Description
Technical field
The invention belongs to low-voltage protection circuit fields, switch off control circuit more particularly to a kind of DC-DC power source low pressure.
Background technique
There is storage battery power shortage after automobile is in use, often will appear vehicle long term stop and leads to not showing for starting
As main problem is that vehicle electronics product continuous drain, leads to automobile storage battery power shortage.Storage battery power shortage both caused vehicle without
Method starting can also damage storage battery, reduce storage battery service life.Therefore it is operated normally for protection automobile, avoids vehicle electronics product pair
Vehicle accumulator takes electricity excessively to lead to storage battery power shortage, damages storage battery, while to guarantee when battery voltage is restored to certain voltage value,
Restore to power to vehicle electronics product.Weight after generally requiring vehicle electronics product to need to restore normal with low pressure shutdown and storage battery
The function of newly starting, such as publication：CN202373967U to not only protect battery voltage, but also guarantees that vehicle electronics product is special
Be not monitoring device restore in time starting information of vehicles is monitored, guarantee vehicle safety.But most power supply chips are enabled
There are certain window values for voltage starting and shutdown, that is, after opening, need to drop to certain voltage just will do it shutdown, rather than
Enabled foot carries out shutdown operation when being lower than enabled voltage, and under the working environment of low temperature and high temperature, enables voltage and there is temperature
Drift, this is resulted under the biggish working environment of temperature difference, and storage battery power supply opens and shuts off threshold values and deposits under same hardware parameter
It is varying widely, cannot achieve the stability contorting to vehicle accumulator voltage.
Summary of the invention
It is an object of the present invention in order to solve the above problem and power supply chip window itself can be eliminated by providing one kind
The DC-DC power source low pressure in area switches off control circuit.
Another object of the present invention is to provide a kind of different by the realization of temperature-compensating means in order to solve the above problem
Switch off control circuit under temperature working environment to the DC-DC power source low pressure of the stability contorting of switching voltage.
For this purpose, the invention discloses a kind of DC-DC power source low pressure to switch off control circuit, including power supply chip, voltage detecting
The input of circuit, start-up circuit, CPU and low pressure breaking circuit, the power supply chip terminates main power source, and output end is respectively
CPU and power supply for electrical equipment, the CPU detects the voltage value of main power source by voltage detecting circuit, when detecting main power source
When voltage value is less than preset shutdown electrical voltage point, exports control signal and give low pressure breaking circuit, low pressure breaking circuit is according to control
Signal control power supply chip stops working, and the first input end of the start-up circuit connects the output end of main power source, output termination
The enable end of power supply chip, the voltage value of the start-up circuit detection main power source, when the main power voltage value detected is greater than in advance
If start electrical voltage point, the start-up circuit control power supply chip work.
Further, the model MP4560D of the power supply chip.
It further, further include temperature-compensation circuit, the temperature-compensation circuit is according to the enabled voltage temperature of power supply chip
Characteristic is floated, relevant voltage compensation is carried out to the output voltage of start-up circuit output end.
Further, the temperature-compensation circuit is realized by several diodes.
Further, the low pressure breaking circuit, start-up circuit and temperature-compensation circuit include PMOS tube Q1, diode
D1-D4, resistance R2, resistance R4, resistance R7 and resistance R8, the PMOS tube Q1 grid connect the control output end of CPU, lead to simultaneously
Resistance R8 ground connection is crossed, the source electrode of the PMOS tube Q1 connects the enable end of power supply chip, and the drain electrode of the PMOS tube Q1 is successively gone here and there
Union II pole pipe D1 and resistance R7 ground connection, main power source are sequentially connected in series resistance R2 and R4 ground connection, and the node between resistance R2 and R4 is successively
Series diode D2, D3, D4 and resistance R7 ground connection.
Further, the model AO3401 of the PMOS tube Q1.
Further, resistance R7 variable resistance R6, the resistance R4 variable resistance R3 also in parallel also in parallel, the electricity
Hinder R2 variable resistance R1 also in parallel.
Further, the main power source is automobile storage battery.
Further, the second input termination automobile key signal of the start-up circuit, when there is automobile key signal defeated
It is fashionable, the start-up circuit control power supply chip work.
Further, the automobile key signal connects the anode of diode D4 by resistance R5.
Advantageous effects of the invention：
The present invention by CPU real-time detection battery voltage after unlatching, and can be lower than by hardware detection cut-in voltage in voltage
After cut-in voltage, power supply chip is controlled, eliminates power supply chip window region itself, while realizing by temperature-compensating means
To the stability contorting of switching voltage under different temperatures working environment, and circuit structure is simple, it is easy to accomplish, it is at low cost.
Detailed description of the invention
Fig. 1 is the structural block diagram of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, a kind of DC-DC power source low pressure switches off control circuit, including power supply chip 4, voltage detecting circuit 2,
The input of start-up circuit 7, CPU3 and low pressure breaking circuit 6, the power supply chip 4 terminates main power source 1, and output end is respectively
CPU3 and electrical equipment 5 are powered, and the CPU3 detects the voltage value of main power source 1 by voltage detecting circuit 2, when detecting main electricity
When the voltage value in source 1 is less than the shutdown electrical voltage point being preset in CPU3, the output end of CPU3 exports control signal and turns off to low pressure
Circuit 6, the control signal that low pressure breaking circuit 6 is exported according to CPU3 make the voltage of the enable end of power supply chip 4 lower than enabled electricity
Pressure, stops working, the first input end of the start-up circuit 7 connects the output end of main power source 1, defeated to control power supply chip 4
The enable end of power supply chip 4 is terminated out, and the start-up circuit 7 detects the voltage value of main power source 1, when 1 electricity of main power source detected
When pressure value is greater than default starting electrical voltage point, i.e., when the voltage value of main power source 1 is greater than default starting electrical voltage point, start-up circuit 7
The output voltage of output end is more than or equal to the enabled voltage of power supply chip 4, to control the work of power supply chip 4.
In this specific embodiment, main power source 1 is automobile storage battery, and the present embodiment is turned off for the low-voltage of automobile storage battery and protected
Shield, certainly, in other embodiments, main power source 1 is also possible to other rechargeable batteries, this is that those skilled in the art can be light
It easily realizes, is no longer described in detail.Correspondingly, the power supply of electrical equipment 5 of the present embodiment is vehicle electronic device.
In this specific embodiment, the model of the power supply chip 4 is preferably MP4560D.
It further include temperature-compensation circuit 8 in this specific embodiment, the temperature-compensation circuit 8 makes according to power supply chip 4
Energy voltage temperature drift characteristic carries out relevant voltage compensation to the output voltage of 7 output end of start-up circuit, so that for different operating temperature
Under degree, when enabling voltage change, the starting electrical voltage point of automobile storage battery 1 is basically unchanged.
In this specific embodiment, the temperature-compensation circuit 8 is realized by several diodes, certainly, in other embodiments
In, it can also be realized using the electronic component with temperature variation characteristic, such as semiconductor switch, this is those skilled in the art
What member can realize easily, no longer it is described in detail.
In this specific embodiment, the second input terminal of the start-up circuit 7 also connects automobile key signal 9, when there is automobile key
When spoon signal 9 inputs, the start-up circuit 7 controls power supply chip work, i.e., described to open when there is the input of automobile key signal 9
The voltage of the output end of dynamic circuit 7 is more than or equal to the enabled voltage of power supply chip 4, then can be to control the work of power supply chip 4
Low-pressure state starting device.
In this specific embodiment, CPU3 can be realized by single-chip microcontroller, MCU processor with A/D sample port etc..
The circuit diagram of this specific embodiment is as shown in Fig. 2, the low pressure breaking circuit 6, start-up circuit 7 and temperature-compensating electricity
Road 8 includes that PMOS tube Q1, diode D1-D4, resistance R2, resistance R4, resistance R7 and resistance R8, the grid of the PMOS tube Q1 connect
The control output end POWEREN_C of CPU3, while being grounded by resistance R8, resistance R8 shunt capacitance C2, the PMOS tube Q1's
Source electrode meet the enable end POWER_EN of power supply chip 4, the drain electrode of the PMOS tube Q1 successively forward direction series diode D1 and electricity
R7 ground connection is hindered, resistance R7 is parallel with variable resistance R6, and the output end VCAR of automobile storage battery 1 is sequentially connected in series resistance R2 and R4 ground connection,
Successively forward direction series diode D2, D3, D4 and resistance R7 is grounded node between resistance R2 and R4, and the resistance R4 also parallel connection can
Power transformation hinders R3, resistance R2 variable resistance R1 also in parallel.The output end IG_ON of automobile key signal 9 connects two by resistance R5
The anode of pole pipe D4.
Certainly, in other embodiments, diode D2, D3 and D4 can be selected according to practical temperature drift situation, if any
A little embodiments only have one or two of diode D2, D3 and D4 or some embodiments also to connect more multiple diode.
Certainly, in other embodiments, start-up circuit 7 can also realize that this is using existing other bleeder circuits
What those skilled in the art can realize easily, no longer it is described in detail.
Voltage detecting circuit 2 includes resistance R9 and R10, and the output end VCAR of automobile storage battery 1 is sequentially connected in series resistance R9 and R10
Ground connection, the node between resistance R9 and R10 meet the sampling end VIN_LOW of CPU3（With A/D sampling functions）.Certainly, other
In embodiment, voltage detecting circuit 2 can also use existing other voltage detecting circuits, this is that those skilled in the art can be with
It realizes, is no longer described in detail easily.
In this specific embodiment, the model of the PMOS tube Q1 is preferably AO3401.
The course of work：
In this specific embodiment, power supply chip MP4560D, chip interior 3V weak pull-up, virtual value is from -40 °C~+85 °C
1.3V~1.8V, triggering window value are 0.3V, set starting electrical voltage point as V_ON（The voltage can by resistance R1, R2, R3, R4,
R6 and R7 realizes adjusting jointly）, CPU3 internal processes, which are set, turns off electrical voltage point as V_OFF.
When the voltage of the output end VCAR of automobile storage battery 1 is lower than V_ON, the grid grade of PMOS tube Q1 connects pull down resistor,
PMOS tube Q1 conducting, the enable end POWER_EN and diode D1 and resistance R7 of power supply chip 4 constitute circuit, are pulled down to and are less than electricity
Source chip 4 opens enabled voltage（1.5V）, the output end VCAR of automobile storage battery 1 divides to the undertension of A point so that power supply core
Piece 4 starts.
When the voltage of the output end VCAR of automobile storage battery 1 rises to higher than V_ON, the output end VCAR of automobile storage battery 1 is logical
It crosses partial pressure and raises A point voltage, the enable end POWER_EN of power supply chip 4 is made to reach enabled foot significant level 1.5V.Power supply at this time
Chip 4 starts, and is powered to CPU3, while the control output end POWEREN_C of CPU3 exports high level, cuts PMOS tube Q1
Only, diode D1 prevents A point voltage from flowing backward the enable end POWER_EN of power supply chip 4, realizes the enable end of power supply chip 4
POWER_EN high-impedance state makes power supply chip 4 skip window region and reaches 3.0V.
When the voltage of the output end VCAR of automobile storage battery 1 continue rise when attonity, power supply chip 4 keep starting and by
CPU3 is monitored the voltage value of the output end VCAR of automobile storage battery 1.
When the voltage of the output end VCAR of automobile storage battery 1 is decreased below V_ON, at this time by software set off value V_
When the voltage of OFF, the output end VCAR of automobile storage battery 1 are higher than setting off value V_OFF, the control output end POWEREN_ of CPU3
C persistently exports high level, keeps PMOS tube Q1 cut-off, power supply chip 4 is in running order, when the output end of automobile storage battery 1
When the voltage of VCAR is lower than setting off value V_OFF, low level is exported by the control output end POWEREN_C of CPU3, makes PMOS
Pipe Q1 conducting, the enable end POWER_EN of power supply chip 4 is pulled down to and enables voltage lower than power supply chip 4, closes power supply chip
4, shutdown equipment power supply.By setting off value V_OFF, the window region of power supply chip 4 itself can be eliminated.
In terms of temperature-compensating, from -40 °C~+85 °C, the enable end POWER_EN temperature drift value of power supply chip 4 be 1.3V~
1.8V, diode D1 (model LL4148) conducting voltage are 0.4V-0.1V, i.e. A point voltage needs to increase from low temperature to high temperature
The voltage of 0.8V, the output end VCAR of automobile storage battery 1 needed for script increase relevant voltage, and by diode D2, D3 and D4 (model
Make to assign to A needed for the voltage of the output end VCAR of automobile storage battery 1 when low temperature is to high temperature for the backward dioded of LL4148) combination
Point voltage then reduces 0.3*3=0.9V, Contrary compensation is carried out to A point voltage, thus the voltage of the output end VCAR of automobile storage battery 1
Original setting voltage can be kept, realizes the stability contorting for restoring voltage and shutdown voltage under -40 °C~+85 °C working environments.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (10)
1. a kind of DC-DC power source low pressure switches off control circuit, it is characterised in that：Including power supply chip, voltage detecting circuit, starting
The input of circuit, CPU and low pressure breaking circuit, the power supply chip terminates main power source, and output end is respectively that CPU and electricity consumption are set
Available electricity, the CPU detect the voltage value of main power source by voltage detecting circuit, when the voltage value for detecting main power source is less than in advance
If shutdown electrical voltage point when, export control signal and give low pressure breaking circuit, low pressure breaking circuit is according to control signal control power supply
Chip stops working, and the first input end of the start-up circuit connects the output end of main power source, and output termination power supply chip makes
Energy end, the voltage value of the start-up circuit detection main power source, when the main power voltage value detected is greater than default starting electrical voltage point
When, the start-up circuit control power supply chip work.
2. DC-DC power source low pressure according to claim 1 switches off control circuit, it is characterised in that：The power supply chip
Model MP4560D.
3. DC-DC power source low pressure according to claim 1 or 2 switches off control circuit, it is characterised in that：It further include that temperature is mended
Repay circuit, output of the temperature-compensation circuit according to the enabled voltage temperature drift characteristic of power supply chip, to start-up circuit output end
Voltage carries out relevant voltage compensation.
4. DC-DC power source low pressure according to claim 3 switches off control circuit, it is characterised in that：The temperature-compensating electricity
Several diodes are routed to realize.
5. DC-DC power source low pressure according to claim 3 or 4 switches off control circuit, it is characterised in that：The low pressure shutdown
Circuit, start-up circuit and temperature-compensation circuit include PMOS tube Q1, diode D1-D4, resistance R2, resistance R4, resistance R7 and electricity
R8 is hindered, the grid of the PMOS tube Q1 connects the control output end of CPU, while being grounded by resistance R8, the PMOS tube Q1's
Source electrode connects the enable end of power supply chip, and the drain electrode of the PMOS tube Q1 is sequentially connected in series diode D1 and resistance R7 ground connection, main power source
It is sequentially connected in series resistance R2 and R4 ground connection, the node between resistance R2 and R4 is sequentially connected in series diode D2, D3, D4 and resistance R7 connects
Ground.
6. DC-DC power source low pressure according to claim 5 switches off control circuit, it is characterised in that：The PMOS tube Q1's
Model AO3401.
7. DC-DC power source low pressure according to claim 5 switches off control circuit, it is characterised in that：The resistance R7 is also simultaneously
Join variable resistance R6, resistance R4 variable resistance R3, the resistance R2 also in parallel variable resistance R1 also in parallel.
8. DC-DC power source low pressure according to claim 5 switches off control circuit, it is characterised in that：The main power source is vapour
Automobile battery.
9. DC-DC power source low pressure according to claim 8 switches off control circuit, it is characterised in that：The start-up circuit
Second input termination automobile key signal, when there is the input of automobile key signal, the start-up circuit control power supply chip work.
10. DC-DC power source low pressure according to claim 9 switches off control circuit, it is characterised in that：The automobile key letter
The anode of diode D4 number is connect by resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338359.3A CN108880215A (en) | 2017-05-15 | 2017-05-15 | A kind of DC-DC power source low pressure switches off control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338359.3A CN108880215A (en) | 2017-05-15 | 2017-05-15 | A kind of DC-DC power source low pressure switches off control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108880215A true CN108880215A (en) | 2018-11-23 |
Family
ID=64320388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710338359.3A Pending CN108880215A (en) | 2017-05-15 | 2017-05-15 | A kind of DC-DC power source low pressure switches off control circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN108880215A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115101020A (en) * | 2022-06-23 | 2022-09-23 | 惠科股份有限公司 | Control circuit and display device |
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| CN105984400A (en) * | 2015-01-30 | 2016-10-05 | 厦门雅迅网络股份有限公司 | Vehicular power supply switch device |
| CN206077228U (en) * | 2016-09-30 | 2017-04-05 | 安徽江淮汽车集团股份有限公司 | A kind of automobile-used voltage voltage-stabilizing device and automobile power supply system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110221267A1 (en) * | 2008-10-01 | 2011-09-15 | Robert Bosch Gmbh | Voltage Supply |
| CN201369588Y (en) * | 2009-02-24 | 2009-12-23 | 向琪 | Vehicle battery alarm annunciator |
| CN103138551A (en) * | 2011-11-30 | 2013-06-05 | 深圳市明微电子股份有限公司 | Control method and device for low current started and low voltage protection circuit |
| CN104044538A (en) * | 2014-05-29 | 2014-09-17 | 北京新能源汽车股份有限公司 | Electricity loss prevention device and electricity loss prevention method of low-voltage storage battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115101020B (en) * | 2022-06-23 | 2024-01-26 | 惠科股份有限公司 | Control circuit and display device |
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