CN108599357A - A kind of vehicle-mounted data terminal power supply switch circuit - Google Patents
A kind of vehicle-mounted data terminal power supply switch circuit Download PDFInfo
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- CN108599357A CN108599357A CN201810087199.4A CN201810087199A CN108599357A CN 108599357 A CN108599357 A CN 108599357A CN 201810087199 A CN201810087199 A CN 201810087199A CN 108599357 A CN108599357 A CN 108599357A
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- 238000005070 sampling Methods 0.000 claims abstract description 47
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- 235000013399 edible fruits Nutrition 0.000 claims description 3
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- 229910018095 Ni-MH Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of vehicle-mounted data terminal power supply switch circuits, include external power input, power output end, charging unit, diode, field-effect tube, stand-by power supply, the first sampling comparison circuit, the second sampling comparison circuit and control circuit, the external power input and stand-by power supply are connected to control circuit by sampling comparison circuit respectively, switch external power supply and stand-by power supply by control circuit.The present invention carries out switch control using field-effect tube, and electrical leakage problems caused by diode and high temperature is avoided to burn risk, and the delivery efficiency of stand-by power supply is promoted；Being sampled by electric resistance partial pressure reduces the consumption electric current of circuit, and the opening time of field-effect tube can be controlled by resistance value setting；It is controlled relative to MCU, the response time for accelerating to switch field-effect tube using arbitraling logic circuit.The present invention can be widely applied to electronic circuit field as a kind of vehicle-mounted data terminal with power supply switch circuit.
Description
Technical field
The present invention relates to electronic circuit field, especially a kind of vehicle-mounted data terminal power supply switch circuit.
Background technology
In order to meet, " car-mounted terminal is after vehicle is abnormal and car-mounted terminal is caused to be disconnected with vehicle main power source
Can at least support the last 10 minutes data of vehicle to be uploaded to enterprise platform with independent operating, independent operating duration " production
Product demand, each vehicle carried data collecting product vendor generally use stand-by power supply switching circuit as shown in Figure 1 realize " main power source
Can be 10 minutes with independent operating after disconnection " product function.
But there are the following problems for circuit shown in Fig. 1：Built-in stand-by power supply U2 is arrived again through externally fed to charging unit U1
Between only every a diode K2 voltages, calculated by 1A electric currents with diode K2,0.7W will be generated on diode K2
Heat will generate 40-50 DEG C of temperature if diode K2 is encapsulated using SOD-232 under room temperature, on diode K2 and rise and reduce circuit
Working efficiency；If working under 75 DEG C of environment temperatures, theoretically diode K2 will save maximal work temperature close to 115 DEG C of PN of its material
The limit is spent, diode K2, which exists, burns risk.
To reduce diode calorific value, diode K2 can be changed to Schottky diode, reduce by two in this way by many manufacturers
Pole pipe heating power is to 0.3W (with 1A Current calculations), but the float charge voltage of battery in this way will be lower, 0.4V low compared with diode
Left and right, can cause reserve battery that can not be full of battery by floating charge pattern.
In addition, because diode K2 is constant conduction, is influenced by loading below, there can be built-in stand-by power supply U2
Over-discharge risk.If battery is more than the final voltage value of battery discharge in discharge process, also continuing to may when discharging
Inner pressure of battery can be caused to increase, the invertibity of positive and negative electrode active material is damaged, and so that the capacity of battery is generated and is significantly reduced,
Extreme influence is caused to battery life.
Therefore, to further increase the delivery efficiency of built-in stand-by power supply U2, many suppliers can use electricity as shown in Figure 2
Diode K2 in Fig. 1 is changed to FET switch circuit by road, and whether logical external voltage Acquisition Circuit detection external voltage drops to
Built-in interior supply voltage can be opened, field-effect tube K2 is opened if as low as certain voltage.Because of field-effect tube K2 pressure drops
Almost 0, it can thus reduce built-in stand-by power supply U2 and export 30% delivery efficiency.However after being changed to field-effect tube, such as
Fruit microcontroller U4 can not fall quickly through Acquisition Circuit U3 external voltages and be opened before Voltage Drop to the ends K4 powers off
K2, entire power supply system will have power-off risk.
To sum up, although at present on the market it is used can meet " externally fed " power down such as Fig. 1 circuits after power and do not power off
It is required that but it is low there are stand-by power supply power supply efficiency the problems such as；Although Fig. 2 can improve reserve battery power supply efficiency, exist
The risk of the field-effect tube K2 power-off of K4 output ends in handoff procedure.
Invention content
In order to solve the above-mentioned technical problem, the purpose of invention is：A kind of hardware circuit is developed, realizes vehicle-mounted data terminal
Improve the power supply switch circuit of stand-by power supply delivery efficiency and response time.
The technical solution adopted in the present invention is：A kind of vehicle-mounted data terminal power supply switch circuit includes：
One external power input, for providing first voltage；
One power output end, for providing operating voltage to vehicle-mounted data terminal；
One diode is exported for connecting external power input, and by first voltage to power output end；
One stand-by power supply；
One charging unit is converted to second voltage for connecting external power input, and by first voltage, to provide
Two voltages charge to stand-by power supply；
One first sampling comparison circuit, joins for being sampled to first voltage, and by first voltage sampled value and first
It examines voltage to be compared, obtains the first comparison result；
One second sampling comparison circuit, joins for being sampled to second voltage, and by second voltage sampled value and second
It examines voltage to be compared, obtains the second comparison result；
One control circuit for connecting stand-by power supply and power output end, and compares with second according to the first comparison result
The connection of output control stand-by power supply and power output end.
Further, the control circuit includes
One field-effect tube, for connecting stand-by power supply and power output end；
One arbitraling logic circuit, for according to the first comparison result with the second comparison result control field-effect tube conducting or
Cut-off.
Further, the first sampling comparison circuit includes：
One first sampling module obtains first voltage sampled value for being sampled to first voltage；
One first comparison module, for connecting the first sampling module, and by first voltage sampled value and the first reference voltage
It is compared, obtains the first comparison result.
Further, first comparison module includes：
One first comparator, for first voltage sampled value to be compared with the first reference voltage；
One first NOT gate to receive the output signal of first comparator, and obtains intermediate ratio for connecting first comparator
Relatively result；
One second NOT gate to receive intermediate comparison result, and exports the first comparison result for connecting the first NOT gate.
Further, the second sampling comparison circuit includes：
One second sampling module obtains second voltage sampled value for being sampled to second voltage；
One second comparison module, for connecting the second sampling module, and by second voltage sampled value and the second reference voltage
It is compared, obtains the second comparison result.
Further, second comparison module includes：
One second comparator, for second voltage sampled value to be compared with the second reference voltage；
One third NOT gate to receive the output signal of the second comparator, and exports the second ratio for connecting the second comparator
Relatively result.
Further, the arbitraling logic circuit includes the 4th NOT gate, the 5th NOT gate, the 6th NOT gate, the 7th NOT gate, first
With door, second with door, third and door, the 4th with door, first or door and second or door, the output of the first sampling comparison circuit
End is respectively connected to the first input end of the input terminal of the 5th NOT gate, the second input terminal of third and door and the 4th and door, described
The output end of second sampling comparison circuit is respectively connected to the second input terminal and the 4th of the input terminal of the 4th NOT gate, second and door
It is respectively connected to the first first input end and third and door with door with the output end of the second input terminal of door, the 4th NOT gate
First input end, the output end of the 5th NOT gate is respectively connected to first and the second input terminal of door and second and the of door
One input terminal, described first is connected to the first input end of first or door with the output end of door, described second with the output end of door
It is connected to the second input terminal of first or door, the output end of the third and door is connected to the first input end of second or door, institute
State the 4th the second input terminal for being connected to second or door by the 6th NOT gate with the output end of door, described first or door output end
The input terminal of the 7th NOT gate is connected to the output end of second or door, the output end of the 7th NOT gate is for controlling field-effect
The on or off of pipe.
The beneficial effects of the invention are as follows：Switch control is carried out using field-effect tube in circuit, is not in use two in the past
System cut-off problem in battery drain problem caused by pole pipe and use software control handoff procedure, avoids diode in high temperature work
That makees burns risk, improves the delivery efficiency of stand-by power supply；Being sampled by electric resistance partial pressure reduces the consumption electric current of circuit, and can
The opening time of field-effect tube is controlled by resistance value setting；The sound for accelerating to switch field-effect tube using arbitraling logic circuit
Between seasonable, at least 28 times are promoted relative to MCU control speed.
Description of the drawings
Fig. 1 is common solution in the prior art；
Fig. 2 is improvement solution in the prior art；
Fig. 3 is the electrical block diagram of the present invention；
Fig. 4 is circuit frame figure in one specific embodiment of circuit of the present invention；.
Fig. 5 is arbitraling logic circuit schematic diagram in one specific embodiment of circuit of the present invention.
Specific embodiment
The specific implementation mode of invention is described further below in conjunction with the accompanying drawings：
With reference to Fig. 3, a kind of vehicle-mounted data terminal power supply switch circuit includes：
One external power input, for providing first voltage；
One power output end, for providing operating voltage to vehicle-mounted data terminal；
One diode K1 is exported for connecting external power input, and by first voltage to power output end；
One stand-by power supply U2；
One charging unit U1 is converted to second voltage for connecting external power input, and by first voltage, to provide
Second voltage charges to stand-by power supply U2；
One first sampling comparison circuit, joins for being sampled to first voltage, and by first voltage sampled value and first
It examines voltage to be compared, obtains the first comparison result；
One second sampling comparison circuit, joins for being sampled to second voltage, and by second voltage sampled value and second
It examines voltage to be compared, obtains the second comparison result；
One control circuit for connecting stand-by power supply U2 and power output end, and compares with second according to the first comparison result
Compared with the connection of output control stand-by power supply U2 and power output end.
It is further used as preferred embodiment, the control circuit includes
One field-effect tube K2, for connecting stand-by power supply U2 and power output end；
One arbitraling logic circuit K3, for controlling leading for field-effect tube K2 with the second comparison result according to the first comparison result
Logical or cut-off.
Low level is exported when the first sampling comparison circuit detects that the voltage value of external power input is less than certain value,
Otherwise high level is exported；Likewise, when the second sampling comparison circuit detects the voltage value of stand-by power supply U2 outputs less than certain
Low level is exported when value, otherwise exports high level.Then arbitraling logic circuit K3 is adopted according to the first sampling comparison circuit and second
The output control field-effect tube K2 of sample comparison circuit.The first sampling comparison circuit, the second sampling comparison circuit and arbitration are patrolled in Fig. 3
Difference can be realized with according to practical application scene, pass through the adjusting to arbitraling logic circuit K3 circuit structures by collecting the function of circuit K3
Arbitrated logic, to realize control to power supply switch logic.
Such as the output A of the sampling comparison circuits of output B and second for the first sampling comparison circuit, arbitraling logic circuit
It is as follows that K3 exports logic：
Work as A=0, when B=0, arbitraling logic circuit K3 outputs are 0；
In the case of indicating no external power supply input and stand-by power supply U2 electricity shortages, field-effect tube K2 is in open circuit
Shape is all not necessarily to internal/external power and powers；
Work as A=0, when B=1, arbitraling logic circuit K3 outputs are 0；
In the case of indicating external power input normal power supply, field-effect tube K2 is in open circuit shape, stand-by power supply U2 chargings；
Work as A=1, when B=0, arbitraling logic circuit K3 outputs are 0；
In the case of indicating that external power input disconnects, field-effect tube K2 is in closed form, is powered by stand-by power supply U2；
Work as A=1, when B=1, arbitraling logic circuit K3 outputs are 1；
It indicates to power by external power input, field-effect tube K2 is in open-circuit condition, stand-by power supply U2 chargings.
It is further used as preferred embodiment, the first sampling comparison circuit includes：
One first sampling module obtains first voltage sampled value for being sampled to first voltage；
One first comparison module, for connecting the first sampling module, and by first voltage sampled value and the first reference voltage
It is compared, obtains the first comparison result.
As shown in figure 3, the first sampling module in the specific embodiment of the invention includes first resistor R1 and second resistance
R2, the external power input are connected to one end of first resistor R1, and the other end of the first resistor R1 passes through the second electricity
R2 ground connection is hindered, the other end of the first resistor R1 is also connected to the first comparison module as the output end of the first sampling module
The first input end of U3-B；The second input terminal of the first comparison module U3-B is for inputting the first reference voltage signal
VrefB。
With reference to Fig. 4, it is further used as preferred embodiment, first comparison module includes：
One first comparator U3-B, for by first voltage sampled value compared with the first reference voltage is into VrefB rows；
One first NOT gate U6-A, for connecting first comparator U3-B, to receive the output signal of first comparator U3-B
C3, and obtain intermediate comparison result C4；
One second NOT gate U6-C to receive intermediate comparison result C4, and exports the first ratio for connecting the first NOT gate U6-A
Compared with result C5.
It is further used as preferred embodiment, the second sampling comparison circuit includes：
One second sampling module obtains second voltage sampled value for being sampled to second voltage；
One second comparison module, for connecting the second sampling module, and by second voltage sampled value and the second reference voltage
It is compared, obtains the second comparison result.
With reference to Fig. 3, second sampling module includes 3rd resistor R3 and the 4th resistance R4, the charging unit U1's
Output end is connected to one end of 3rd resistor R3, and the other end of the 3rd resistor R3 is by the 4th resistance R4 ground connection, and described the
The other end of three resistance R3 is also connected to the first input end of the second comparison module as the output end of the second sampling module；It is described
The output end of second sampling module is connected to the first input end of the second comparison module U3-A, the second comparison module U3-A's
Second input terminal is for inputting the second reference voltage signal VrefA.
With reference to Fig. 4, it is further used as preferred embodiment, second comparison module includes：
One second comparator U3-A, for second voltage sampled value to be compared with the second reference voltage Vref A；
One third NOT gate U6-B, for connecting the second comparator U3-A, to receive the output signal of the second comparator U3-A
C1, and export the second comparison result C2.
It is further used as preferred embodiment, in order to improve the first comparison module U3-B's or the second comparison module U3-A
Speed can adjust reference voltage, such as set reference voltage to 1V according to application request.Using 1.1V and 0.9V into
Row compares, and compared with coming with 2V relative to 1.1V, comparison module often can faster export 0 or 1 level.
Setting stand-by power supply U2 over-discharge voltages are 7.9V, the voltage after 3rd resistor R3 and the 4th resistance R4 partial pressures
When less than or equal to 1V, the second comparison module output 0, when stand-by power supply U2 voltages are more than 7.9V, the second comparison module output 1.
The circuit parameter of specific stand-by power supply U2 voltages, 3rd resistor R3 and the 4th resistance R4 can refer to the following table 1.
Table 1, U2 and divider resistance R3, R4 circuit parameter
| U2 (voltage) | R3 (M Ω precision 1%) | R4 (M Ω precision 1%) | Voltage acquisition A (voltage) | U2 (leakage current) uA |
| 7 | 6.8 | 1.1 | 0.974683544 | 0.886075949 |
| 7.8 | 6.8 | 1.1 | 1.086075949 | 0.987341772 |
| 7.9 | 6.8 | 1.1 | 1.1 | 1 |
| 8 | 6.8 | 1.1 | 1.113924051 | 1.012658228 |
| 8.8 | 6.8 | 1.1 | 1.225316456 | 1.113924051 |
| 13 | 6.8 | 1.1 | 1.810126582 | 1.64556962 |
With reference to table 1,3rd resistor R3 and the 4th resistance R4 sampling voltages follow stand-by power supply U2 voltage changes, work as standby electricity
When source U2 voltages are reduced to 7.9V or less, voltage acquisition A is less than the second reference voltage Vref A, the second comparison module U3-A outputs
0；Correspondingly, when stand-by power supply U2 voltages increase to 7.9V or more, voltage acquisition A is more than the second reference voltage Vref A, second
Comparison module U3-A outputs 1.Ni-MH battery group over-discharge voltage is 7V or so, therefore real using the second comparison module U3-A
Now compare the voltage accuracy problem for not needing to excessively pay close attention to voltage acquisition A in the design of output.
The Voltage Drop of external power input is set to 10.2V hereinafter, voltage passes through first resistor R1 and second resistance
When voltage is less than or equal to 1V after R2 partial pressures, the first comparison module output 0, when the voltage of external power input is more than 10.2V,
First comparison module output 1.First resistor R1 and second resistance R2 after a loss of power will not impact Fig. 3 circuit power consumptions.Tool
The circuit parameter of the voltage of the external power input of body, first resistor R1 and second resistance R2 can refer to the following table 2.
Table 2, external power supply and divider resistance R1, R2 circuit parameter
| External power supply (voltage) | R1 (M Ω precision 1%) | R2 (M Ω precision 1%) | Voltage acquisition B (voltage) |
| 9 | 9.1 | 1.1 | 0.970588235 |
| 10 | 9.1 | 1.1 | 1.078431373 |
| 10.1 | 9.1 | 1.1 | 1.089215686 |
| 10.2 | 9.1 | 1.1 | 1.1 |
| 10.5 | 9.1 | 1.1 | 1.132352941 |
| 11 | 9.1 | 1.1 | 1.18627451 |
| 13 | 9.1 | 1.1 | 1.401960784 |
By adjusting first resistor R1 and second resistance R2,3rd resistor R3 and the 4th the formed voltage values of resistance R4 can be with
The field-effect tube K2 opening times are controlled, circuit is more flexible, rapid compared with software control is used, and can will scheme by adjusting resistance value
Current reduction is consumed in 3 circuits to 100uA, circuit self discharge is affected by a load controllable.The hardware controls time is the response time
It is minimum to accomplish the 700ps response times, and by taking 20MHz microcontrollers as an example, it is controlled using software when without the ADC sampling times
Response time be 200ns, so using the more quick control response advantage of hardware logic.
With reference to Fig. 5, be further used as preferred embodiment, the arbitraling logic circuit K3 include the 7th NOT gate F1,
5th NOT gate F2, the 6th NOT gate F3, the 7th NOT gate F4, first and door U4-A, second and door U4-B, third and door U4-C, the 4th
With door U4-D, first or door U5-A and second or door U5-B, the output end of the first sampling comparison circuit is respectively connected to the
The first input end of the input terminal of five NOT gate F2, the second input terminal of third and door U4-C and the 4th and door U4-D, described second
The output end of sampling comparison circuit be respectively connected to the input terminal of the 7th NOT gate F1, second with the second input terminal of door U4-B and the
The output end of the second input terminal of four and door U4-D, the 7th NOT gate F1 is respectively connected to first the first input with door U4-A
The first input end at end and third and door U4-C, the output end of the 5th NOT gate F2 are respectively connected to the of first and door U4-A
The output end of the first input end of two input terminals and second and door U4-B, described first and door U4-A is connected to first or door U5-A
First input end, described second is connected to the second input terminal of first or door U5-A, the third with the output end of door U4-B
It is connected to the first input end of second or door U5-B with the output end of door U4-C, the described 4th passes through the with the output end of door U4-D
Six NOT gate F3 are connected to the second input terminal of second or door U5-B, the output end of described first or door U5-A and second or door U5-B
Output end be connected to the input terminal of the 7th NOT gate F4, the output end of the 7th NOT gate is used to control the conducting of field-effect tube
Or cut-off.
The input terminal C5 and C2 of the arbitraling logic circuit K3 be respectively used to receive first sampling comparison circuit output B and
In the output A of second sampling comparison circuit, arbitraling logic circuit K3 logic such as the following table 3 is realized with door, NOT gate：
In table 3, arbitraling logic circuit K3 with door, NOT gate truth table
| A | B | ~A | ~B | ~A&~B | A&~B | ~A&B | ~(A ＆ B) |
| 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 |
| 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 |
| 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
A is indicated：Battery meets discharging condition；Such as A=0 indicates that stand-by power supply U2 voltages≤7.9V, battery exist excessive
Electric discharge risk, in-line power will be switched off；A=1 indicates stand-by power supply U2 voltage ＞ 7.9V, can be powered by internal electric source；
B is indicated：External power supply normal power supply condition；Such as B=0 indicates external power input voltage≤10.2V, power supply
It will be switched off；B=1 indicates that external power input voltage ＞ 10.2V, power supply power supply are normal；
~A is indicated：Battery, which is in over-discharge state or battery, externally to discharge；
~B is indicated：External power supply is for electrically disconnected；
~A&~B is indicated：Internal/external power all disconnects, and internal stand-by power supply is in over-discharge state；
A&~B is indicated：It in the case where external power supply disconnects, is powered by internal stand-by power supply, stand-by power supply was not up to
Spend discharging condition；
~A＆B is indicated：In the case of external power supply normal power supply, the charging of internal stand-by power supply；
~(A＆B) it indicates：Inside and outside power supply charges to internal stand-by power supply in the case of all meeting normal power supply.
It can show that in arbitraling logic circuit K3 or door, NOT gate realize logic such as the following table 4 in conjunction with table 3：
Table 4：In arbitraling logic circuit K3 or door, NOT gate realize logic
| A | B | ~(~A&~B)|(A&~B)|(A&~B) | ~[~(A&B)] |
| 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 |
| 1 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 |
Wherein (~A&~B)|(A&~B)|(A&~B it) indicates under three kinds of states, the output C6 of arbitraling logic circuit K3 (is imitated on the spot
Should pipe K2 control logic) with~(A＆B) identical, specific control logic is as follows：
Work as A=0, when B=0, arbitraling logic circuit K3 outputs are 0；
In the case of indicating no external power supply input and stand-by power supply U2 electricity shortages, field-effect tube K2 is in open circuit
Shape is all not necessarily to internal/external power and powers；
Work as A=0, when B=1, arbitraling logic circuit K3 outputs are 0；
In the case of indicating external power input normal power supply, field-effect tube K2 is in open circuit shape, stand-by power supply U2 chargings；
Work as A=1, when B=0, arbitraling logic circuit K3 outputs are 0；
In the case of indicating that external power input disconnects, field-effect tube K2 is in closed form, is powered by stand-by power supply U2；
Work as A=1, when B=1, arbitraling logic circuit K3 outputs are 1；
It indicates to power by external power input, field-effect tube K2 is in open-circuit condition, stand-by power supply U2 chargings.
It is to be illustrated to the preferable implementation of the present invention, but be not limited to the embodiment above, is familiar with ability
The technical staff in domain can also make various equivalents or replacement under the premise of without prejudice to spirit of that invention, these are equivalent
Deformation or replacement be all contained in the application claim limited range.
Claims (7)
1. a kind of vehicle-mounted data terminal power supply switch circuit, which is characterized in that include：
One external power input, for providing first voltage；
One power output end, for providing operating voltage to vehicle-mounted data terminal；
One diode is exported for connecting external power input, and by first voltage to power output end；
One stand-by power supply；
One charging unit is converted to second voltage for connecting external power input, and by first voltage, to provide the second electricity
Pressure charges to stand-by power supply；
One first sampling comparison circuit, for being sampled to first voltage, and first voltage sampled value and the first reference is electric
Pressure is compared, and obtains the first comparison result；
One second sampling comparison circuit, for being sampled to second voltage, and second voltage sampled value and the second reference is electric
Pressure is compared, and obtains the second comparison result；
One control circuit, for connecting stand-by power supply and power output end, and according to the first comparison result with the second comparison result
Control the connection of stand-by power supply and power output end.
2. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 1, it is characterised in that：The control electricity
Road includes
One field-effect tube, for connecting stand-by power supply and power output end；
One arbitraling logic circuit, for controlling the conducting of field-effect tube with the second comparison result according to the first comparison result or cutting
Only.
3. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 1 or 2, it is characterised in that：Described
One, which samples comparison circuit, includes：
One first sampling module obtains first voltage sampled value for being sampled to first voltage；
One first comparison module is carried out for connecting the first sampling module, and by first voltage sampled value and the first reference voltage
Compare, obtains the first comparison result.
4. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 3, it is characterised in that：First ratio
Include compared with module：
One first comparator, for first voltage sampled value to be compared with the first reference voltage；
One first NOT gate to receive the output signal of first comparator, and obtains intermediate relatively knot for connecting first comparator
Fruit；
One second NOT gate to receive intermediate comparison result, and exports the first comparison result for connecting the first NOT gate.
5. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 1 or 2, it is characterised in that：Described
Two, which sample comparison circuits, includes：
One second sampling module obtains second voltage sampled value for being sampled to second voltage；
One second comparison module is carried out for connecting the second sampling module, and by second voltage sampled value and the second reference voltage
Compare, obtains the second comparison result.
6. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 5, it is characterised in that：Second ratio
Include compared with module：
One second comparator, for second voltage sampled value to be compared with the second reference voltage；
One third NOT gate to receive the output signal of the second comparator, and exports second and compares knot for connecting the second comparator
Fruit.
7. a kind of vehicle-mounted data terminal power supply switch circuit according to claim 2, it is characterised in that：The arbitration is patrolled
Volume circuit include the 4th NOT gate, the 5th NOT gate, the 6th NOT gate, the 7th NOT gate, first with door, second with door, third and door, the
Four are respectively connected to the defeated of the 5th NOT gate with door, first or door and second or door, the output end of the first sampling comparison circuit
Enter end, third and door the second input terminal and the 4th with the first input end of door, the output end of the second sampling comparison circuit
Be respectively connected to the 4th NOT gate input terminal, second with the second input terminal of door and the 4th with the second input terminal of door, described the
The output end of four NOT gates is respectively connected to the first input end of first and the first input end and third and door of door, and the described 5th is non-
The output end of door be respectively connected to first with the second input terminal of door and second with the first input end of door, described first with door
Output end is connected to the first input end of first or door, and described second is connected to the second input of first or door with the output end of door
End, the output end of the third and door are connected to the first input end of second or door, and the described 4th passes through the with the output end of door
Six NOT gates are connected to the second input terminal of second or door, described first or door output end and second or the output end of door be all connected with
To the input terminal of the 7th NOT gate, the output end of the 7th NOT gate is used to control the on or off of field-effect tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087199.4A CN108599357A (en) | 2018-01-30 | 2018-01-30 | A kind of vehicle-mounted data terminal power supply switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810087199.4A CN108599357A (en) | 2018-01-30 | 2018-01-30 | A kind of vehicle-mounted data terminal power supply switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108599357A true CN108599357A (en) | 2018-09-28 |
Family
ID=63608466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810087199.4A Pending CN108599357A (en) | 2018-01-30 | 2018-01-30 | A kind of vehicle-mounted data terminal power supply switch circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350654A (en) * | 2019-08-12 | 2019-10-18 | 卡瓦科尔牙科医疗器械（苏州）有限公司 | SD card for medical instrument protects circuit |
| CN112910078A (en) * | 2021-02-07 | 2021-06-04 | 青岛博宁福田智能交通科技发展有限公司 | Double-direct-current power supply switching circuit |
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| CN106787130A (en) * | 2016-12-20 | 2017-05-31 | 深圳市元征科技股份有限公司 | A kind of power supply switch circuit and terminal |
| CN107040137A (en) * | 2017-05-03 | 2017-08-11 | 北京新能源汽车股份有限公司 | It is a kind of to strengthen control device, Vehicular charger and the automobile of main circuit |
| CN208015444U (en) * | 2018-01-30 | 2018-10-26 | 广州小鹏汽车科技有限公司 | A kind of vehicle-mounted data terminal power supply switch circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787130A (en) * | 2016-12-20 | 2017-05-31 | 深圳市元征科技股份有限公司 | A kind of power supply switch circuit and terminal |
| CN107040137A (en) * | 2017-05-03 | 2017-08-11 | 北京新能源汽车股份有限公司 | It is a kind of to strengthen control device, Vehicular charger and the automobile of main circuit |
| CN208015444U (en) * | 2018-01-30 | 2018-10-26 | 广州小鹏汽车科技有限公司 | A kind of vehicle-mounted data terminal power supply switch circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350654A (en) * | 2019-08-12 | 2019-10-18 | 卡瓦科尔牙科医疗器械（苏州）有限公司 | SD card for medical instrument protects circuit |
| CN112910078A (en) * | 2021-02-07 | 2021-06-04 | 青岛博宁福田智能交通科技发展有限公司 | Double-direct-current power supply switching circuit |
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