CN106972454A - High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment - Google Patents
High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment Download PDFInfo
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- CN106972454A CN106972454A CN201710248378.7A CN201710248378A CN106972454A CN 106972454 A CN106972454 A CN 106972454A CN 201710248378 A CN201710248378 A CN 201710248378A CN 106972454 A CN106972454 A CN 106972454A
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- current
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- high voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses a kind of high voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment; the circuit; including switch, sampling and amplifying circuit, ON-OFF control circuit; switch connects power input, ON-OFF control circuit, sampling and amplifying circuit respectively; ON-OFF control circuit connects controller; power output end connection sampling and amplifying circuit, sampling and amplifying circuit via controller AD samplings are connected with controller.Sampled using the A/D converter of controller, when the value that A/D samplings are obtained is identical with the value of required limitation electric current, the IO of controller will export low level, switching tube is forced to turn off, safety and stability is good, current error has filled up the market vacancy not over 10mA, with wide market prospects.
Description
Technical field
The present invention relates to power supply current limiting technique, more particularly to a kind of high voltage-small current current-limiting circuit, current-limiting protection module and
Unmanned delivery's equipment.
Background technology
Current-limiting protection is exactly to reach certain value such as:Protection device shuts off circuit to protect electrical equipment.
It is many currently used for the chip of current-limiting protection, but it is most of be all conventional USB (5V) power supplys current-limiting protection (for example
DIODES AP2552/53A etc.).It is seldom for 12V etc. high voltage power supply current limliting chip, some such as ST STEF12PUR,
Though can be to 12V current limlitings, current limliting size is between 3A -5A, for the module (such as 12V/200mA) of some low currents
But do not serve.
Be on the current limliting chip market of this high voltage-small current it is no, but unmanned plane, unmanned vehicle, branch road power ratio compared with
It is many and need the functional module of power protection, described high voltage-small current is required to such as car borne GPS navigation, communication module
Current limliting chip, current way includes：1) built with discrete device；2) opening and closing of current-limiting circuit need software to match somebody with somebody
Close and perform.It is related to circuit complexity, cumbersome, but safety and stability is poor, and such as many companies are all insured using self- recoverage
Silk (NTC) does current-limiting protection.When back-end circuit (module) excessively stream, fuse can fuse automatically.So as to suitably protect
Terminal circuit before and after shield.But self- recoverage insurance be (NTC) ratio of precision it is relatively low, have at least 100mA peak point current I trip,
I.e.：If we need 200mA current protection, if with resettable fuse (NTC), may instantaneously export 300mA
Electric current even more high (such as table 1：Resettable fuse specification table), the circuit (module) of such rear end may have been burnt up.
Table 1：Resettable fuse specification table
The current value of back-end circuit can not be learnt at any time, and according to the size of electric current, actively shut-off is switched.
In order to solve the above problems, the invention provides a kind of high voltage-small current current-limiting circuit, simple in construction, operation side
Just, safety and stability is good, and current error has filled up the market vacancy not over 10mA, with wide market prospects.And
And the value of active poll sampling rear end output current can also be known at any time, independently shut-off switch, backend load can be known at any time
Electric current during work, beneficial to the circuit according to actual application environment, finds failure in time.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide a kind of high voltage-small current current-limiting circuit, current limliting
Protection module and unmanned delivery's equipment, the present invention accurately measure the size of output current, when defeated by the reasonable design of device
Go out power cutoff when electric current reaches the size for needing current limliting, protection back-end circuit or module, while not influenceing whole power supply just
Often work, and circuit is simple, it is easily manufactured, be conducive to product promotion.
According to an aspect of the invention, there is provided a kind of high voltage-small current current-limiting circuit, including switch, sampling and amplification
Circuit, ON-OFF control circuit, switch connect power input, ON-OFF control circuit, sampling and amplifying circuit, switch control respectively
Circuit connects controller, power output end connection sampling and amplifying circuit, sampling and amplifying circuit via controller AD samplings and control
Device processed is connected.
Further, ON-OFF control circuit includes triode Q2, resistance R6, triode Q3, and connection power supply is defeated respectively for switch
Enter end, resistance R5, sampling and amplifying circuit, resistance R5 connecting triode Q2, triode Q2 are respectively at resistance R6, triode Q3 phases
Even, resistance R6, triode Q3 are connected with controller.
Further, power input connection resistance R4, resistance R4 connection resistance R5.
Further, sampling and amplifying circuit include resistance R1, resistance R2, resistance R3, amplifier U1, switch respectively with electricity
Hinder R1 one end, resistance R2 one end to be connected, the resistance R1 other end connects power output end, resistance R3 one end respectively, electricity
The resistance R2 other end, the resistance R3 other end is connected with amplifier U1, amplifier U1 connection controllers.
Further, switch connects electric capacity C5, amplifier U1 respectively, and electric capacity C5 is connected with earth terminal, amplifier U1 connections
Earth terminal.
Further, triode Q3 is through electric capacity C6 connection earth terminals, and triode Q2 is grounded through electric capacity C7, triode Q3, three
Pole pipe Q2 emitter stage is grounded, and power input connects electric capacity C1, electric capacity C2 respectively, and electric capacity C1, electric capacity C2 are grounded, resistance
The R1 other end connects electric capacity C3, electric capacity C4 respectively, and electric capacity C3, electric capacity C4 are all connected with earth terminal.
Further, switch as switching tube.
Further, controller is MCU chip, and the ADC ports of amplifier U1 connection MCU chips utilize the A/ of MCU chip
D converters are sampled.
According to another aspect of the present invention there is provided a kind of power supply current-limiting protection functional module, including：The high pressure is small
Current limitation circuit.
There is provided a kind of unmanned delivery's equipment, including unmanned plane or unmanned vehicle, Yi Jishe according to another aspect of the present invention
Put the high voltage-small current current-limiting circuit described in unmanned plane or unmanned vehicle.
Compared with prior art, the invention has the advantages that：
1st, the high voltage-small current current-limiting circuit of example of the present invention, including switch, sampling and amplifying circuit, switch control electricity
Road, switch connects power input, ON-OFF control circuit, sampling and amplifying circuit respectively, and ON-OFF control circuit connects controller,
Power output end connection sampling and amplifying circuit, sampling and amplifying circuit via controller AD samplings are connected with controller, utilize control
The A/D converter of device processed is sampled, when A/D samples obtained value with value identical (such as the 2V) of required limitation electric current,
The IO of controller will export low level, force switching tube to turn off, and safety and stability is good, current error not over 10mA,
The market vacancy is filled up, with wide market prospects.
2nd, the high voltage-small current current-limiting circuit of example of the present invention, electricity device involved by whole circuit is few, and circuit is simple, just
In manufacture, device used is cheap, is easy to product to popularize.
3rd, the high voltage-small current current-limiting circuit of example of the present invention, controller MCU actives poll sampling rear end output current
Value, knows electric current during backend load work, independently on-off switching tube at any time, according to actual application environment, finds to ask in time
Topic.
3rd, the power supply current-limiting protection functional module of example of the present invention, can be used for high voltage (such as 12V), low current
The current limliting of the functional module of (200mA), for protection module safety.
4th, unmanned delivery's equipment of example of the present invention, including unmanned plane or unmanned vehicle, and be arranged on unmanned plane or nobody
In-car described high voltage-small current current-limiting circuit, the power cutoff when output current reaches the size for needing current limliting, after protection
Terminal circuit or module, while not influenceing the normal work of whole power supply, effectively protect the normal operation of unmanned delivery's equipment.
Brief description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Embodiment
In order to be better understood by technical scheme, with reference to Figure of description and specific embodiment to the present invention
It is described further.
Embodiment：
As shown in figure 1, a kind of high voltage-small current current-limiting circuit, power input 12V-IN connects electric capacity C1, electric capacity respectively
C2, resistance R4 one end, switching tube Q1-P channel field-effect pipes AO3415 PIN2 pin, electric capacity C1, electric capacity C2 are respectively grounded,
The resistance R4 other end is connected with switching tube Q1-P channel field-effect pipes AO3415 PIN1 pin and is all connected with resistance R5 one end,
Switching tube Q1-P channel field-effect pipes AO3415 PIN3 pin connect electric capacity C5 one end, resistance R1 one end, resistance R2 respectively
One end, electric capacity C5 other end ground connection, the resistance R1 other end connects resistance R3 one end, electric capacity C3 one end, electricity respectively
Hold C4 one end, power output end 12V-OUT, the electric capacity C3 other end, electric capacity C4 other end ground connection, the resistance R2 other end
Be connected with amplifier U1 input PIN4 pin in the same direction, the R3 other end with amplifier U1 (model IN210) reverse input end
PIN5 pin are connected, switching tube Q1-P channel field-effect pipes AO3415 PIN3 pin connection amplifier U1 PIN3 pin, amplifier
U1PIN2 pin are grounded, and amplifier U1PIN2 pin are connected with PIN1 pin, amplifier U1 output end PIN6 pin connection controller MCU's
ADC ports, are sampled using controller MCU A/D converter, when A/D samples obtained value and required limitation electric current
When being worth identical (such as 2V), controller MCU IO will export low level, force switching tube to turn off.Controller MCU active polls are adopted
The value of sample rear end output current, independently on-off switching tube, controller MCU can know electric current during backend load work at any time.
Resistance R5 other end connecting triode Q2 colelctor electrode, triode Q2 base stage connects electric capacity C7, resistance respectively
R6 one end, triode Q3 colelctor electrode, electric capacity C7 ground connection, triode Q2 emitter stage connection earth terminal, resistance R6's is another
End connection controller MCU IO pin, triode Q3 base stage connects controller MCU interruption pin INT, electric capacity C6, electric capacity respectively
C6 is grounded, triode Q3 grounded emitter.
Switching tube Q1-P channel field-effect pipes AO3415：Switching tube Q1-P channel field-effect pipes AO3415 is used to control rear end
The opening and closing of load power source, when backend load needs normal work, then open switching tube；When backend load does not need work
When making or occurring high current exception when working, then closing switch pipe, cuts off the electricity supply.Switching tube Q1 is using conventional P-channel
Effect pipe AO3415, its conducting electric current is maximum, and up to 4A, conducting internal resistance is about 50 milliohms, carries ESD protections, can expire completely
Sufficient demand.
Sampling and amplifying circuit：Sampling resistor R1 is the metalfilmresistor of 0.1 Ω errors 1%, rated power 1/8W, rear end
All thus resistance passes through load current.Amplifier U1 uses the voltage outputs of TI companies, downside or high side measurement, double
To, zero shift series shunting monitor IN210.
Precision is as follows：
- ± 1% gain error (maximum in whole temperature range)
- 0.5 μ V/ DEG C offset drifts (maximum)
- 10ppm/ DEG C of gain drifts (maximum).
Triode Q2：Model DTC114EE.
Electric capacity C1:22uF, error 20%10v, electric capacity C2:0.1uF, error 20%50v, electric capacity C3:22uF, error 20%
10v, electric capacity C4:0.1uF, error 20%50v, electric capacity C5:0.1uF, error 20%50v, electric capacity C6:0.1uF, error 20%
50v, electric capacity C7:0.1uF 20%50v,
Resistance R2:100K Ω, resistance R3:100K Ω, resistance R4:3K Ω, resistance R5:2.2K Ω, resistance R6:1KΩ.
The circuit course of work is as follows：
(1) on before electricity, controller MCU IO pin are without output, and CTRL signal is output as low electricity due to rear end non-transformer
Flat, triode Q3 cut-offs, triode Q2 ends, and without pressure difference between switching tube Q1P-MOS pipes AO3415 PIN2 and PIN1 pin, opens
Pipe Q1 cut-offs are closed, 12V_OUT is output as 0V.
(2) after controller MCU works, controller MCU IO pin are output as high level, and CTRL signal is due to rear end power supply
Do not open, be output as low level, triode Q3 cut-offs, triode Q2 conductings make triode Q2 colelctor electrode PIN3 pin for low electricity
It is flat, due to resistance R4 and R5 partial pressure between such switching tube Q1 PIN2 and PIN1 pin, produce about 5V pressure difference (calculation formula
For：R5/ (R4+R5) × 12), such switching tube Q1P-MOS pipes AO3415 conductings, it is negative to rear end that 12V_OUT exports about 12V voltages
Carry.
(3) (electric current I is less than 200mA), the pressure difference at sampling resistor R1 (0.1 ohm) two ends when backend load normal work
Be fed directly to precision operational-amplifier U1 in-phase end and end of oppisite phase, that is, amplifier U1 PIN4 and PIN5 pin.Amplification
Device U1 multiplication factor is 200V/V.So controller MCU interruption pin (INT) will not trigger interruption, will not also make triode
Q3 is turned on.
(4) (operating current is referred to more than 210mA) when loading normal excessively stream, the connection control of amplifier U1 output end PIN6 pin
Device MCU ADC ports, are sampled using controller MCU A/D converter, when A/D samples obtained value and required limitation
During value identical (such as the 2V) of electric current, controller MCU IO will export low level, force switching tube to turn off.Controller MCU is actively
Poll is sampled the value of rear end output current, independently on-off switching tube, when controller MCU can know backend load work at any time
Electric current.
The power supply current-limiting protection functional module of the present embodiment, including：The high voltage-small current current-limiting circuit.
The unmanned plane of the present embodiment, including：Described high voltage-small current current-limiting circuit.
The unmanned vehicle of the present embodiment, including：Described high voltage-small current current-limiting circuit.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology of the particular combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, is carried out by above-mentioned technical characteristic or its equivalent feature
Other technical schemes formed by any combination.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical characteristic of energy carries out technical scheme formed by replacement mutually.
Claims (10)
1. a kind of high voltage-small current current-limiting circuit, it is characterized in that, including switch, sampling and amplifying circuit, ON-OFF control circuit, open
Close connection power input, ON-OFF control circuit, sampling and amplifying circuit respectively, ON-OFF control circuit connection controller, power supply
Output end connection sampling and amplifying circuit, sampling and amplifying circuit via controller AD samplings are connected with controller.
2. high voltage-small current current-limiting circuit according to claim 1, it is characterized in that, ON-OFF control circuit includes triode
Q2, resistance R6, triode Q3, switch connect power input, resistance R5, sampling and amplifying circuit, resistance R5 connections three respectively
Pole pipe Q2, triode Q2 are connected respectively at resistance R6, triode Q3, and resistance R6, triode Q3 are connected with controller.
3. high voltage-small current current-limiting circuit according to claim 2, it is characterized in that, power input connection resistance R4, electricity
Hinder R4 connection resistance R5.
4. high voltage-small current current-limiting circuit according to claim 3, it is characterized in that, sampling and amplifying circuit include resistance
R1, resistance R2, resistance R3, amplifier U1, one end, the resistance R2 one end of switch respectively with resistance R1 are connected, and resistance R1's is another
One end connects power output end, resistance R3 one end respectively, the resistance R2 other end, the resistance R3 other end with amplifier U1
Connection, amplifier U1 connection controllers.
5. high voltage-small current current-limiting circuit according to claim 4, it is characterized in that, switch connection electric capacity C5, amplification respectively
Device U1, electric capacity C5 is connected with earth terminal, amplifier U1 connection earth terminals.
6. high voltage-small current current-limiting circuit according to claim 5, it is characterized in that, triode Q3 is grounded through electric capacity C6 connections
End, triode Q2 is grounded through electric capacity C7, and triode Q3, triode Q2 emitter stage are grounded, and power input connects electricity respectively
Hold C1, electric capacity C2, electric capacity C1, electric capacity C2 are grounded, and the resistance R1 other end connects electric capacity C3, electric capacity C4, electric capacity C3, electricity respectively
Hold C4 and be all connected with earth terminal.
7. high voltage-small current current-limiting circuit according to claim 6, it is characterized in that, switch as switching tube.
8. high voltage-small current current-limiting circuit according to claim 7, it is characterized in that, controller is MCU chip, amplifier U1
The ADC ports of MCU chip are connected, are sampled using the A/D converter of MCU chip.
9. a kind of current-limiting protection module, it is characterized in that, including the high voltage-small current current-limiting circuit as described in claim 1-8.
10. a kind of unmanned delivery's equipment, it is characterized in that, including unmanned plane or unmanned vehicle, and it is arranged on unmanned plane or unmanned vehicle
The interior high voltage-small current current-limiting circuit as described in claim 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248378.7A CN106972454A (en) | 2017-04-17 | 2017-04-17 | High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710248378.7A CN106972454A (en) | 2017-04-17 | 2017-04-17 | High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment |
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| CN106972454A true CN106972454A (en) | 2017-07-21 |
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| CN201710248378.7A Pending CN106972454A (en) | 2017-04-17 | 2017-04-17 | High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI672884B (en) * | 2017-12-22 | 2019-09-21 | 和碩聯合科技股份有限公司 | Current-limiting circuit structure and controlling method thereof |
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| CN206697909U (en) * | 2017-04-17 | 2017-12-01 | 顺丰科技有限公司 | High voltage-small current current-limiting circuit, current-limiting protection module and unmanned delivery's equipment |
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| CN101378199A (en) * | 2007-08-31 | 2009-03-04 | 鹏智科技(深圳)有限公司 | Charging circuit for battery |
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| TWI672884B (en) * | 2017-12-22 | 2019-09-21 | 和碩聯合科技股份有限公司 | Current-limiting circuit structure and controlling method thereof |
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Application publication date: 20170721 |
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