CN108666969A - A kind of protective circuit for direct current power output - Google Patents
A kind of protective circuit for direct current power output Download PDFInfo
- Publication number
- CN108666969A CN108666969A CN201810476725.6A CN201810476725A CN108666969A CN 108666969 A CN108666969 A CN 108666969A CN 201810476725 A CN201810476725 A CN 201810476725A CN 108666969 A CN108666969 A CN 108666969A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H02H3/087—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 for dc applications
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- Emergency Protection Circuit Devices (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The present invention discloses a kind of protective circuit for direct current power output, is related to analog circuit and digital circuit application field.It includes regulator circuit, electric current input sampling circuit, precision potentiator circuit, rail-to-rail comparator circuit, D classes flip-flop circuit and output control circuit, and electric current input sampling circuit and output control circuit are connected in turn between power input and power supply output；Power input is connect with regulator circuit；Electric current input sampling circuit is connect with rail-to-rail comparator circuit；Precision potentiator circuit is connect with rail-to-rail comparator circuit；Rail-to-rail comparator circuit is connect with D class flip-flop circuits；D class flip-flop circuits are connect with output control circuit.The circuit realizes 5 32V power supplies; the setting of 0 5A high-precisions adjustable overcurrent protection current value (within 1%); fast response time (maximum 8uS); and overcurrent fast cut-off circuit the functions such as re-powers next time until the test equipment or equipment, and life and reliability is greatly improved.
Description
Technical field
The present invention relates to analog circuit and digital circuit application field, especially a kind of protective circuit for direct current power output,
It is mainly used for test equipment or place that equipment (power supply output) powers to test product (power input).
Background technology
In automated production or test process, test equipment or equipment (power supply output) are to test product (power input)
When power supply, can because test product it is bad or it is short-circuit cause load current excessive, and lead to the damage of test equipment or equipment.It passes
The control relay current-limiting circuit of system will produce switch motion repeatedly after overcurrent protection, generate backlash current, short life, response
Time is long (generally in 10mS or so).Traditional self-recovery fuse circuit, overcurrent protection current value is non-adjustable, and overcurrent is protected
It will produce follow current after shield, precision is low and influenced by ambient temperature big (generally in 10% or so error), response time longest
(generally in 1S or more).
Invention content
For solve test product because it is bad or it is short-circuit cause load current excessive, and lead to test equipment or equipment damage
The problem of, the present invention provides a kind of protective circuit for direct current power output, realizes that overcurrent protection current value is adjustable, electricity is cut off after overcurrent
Road, and there is the features such as precision is high, fast response time, long lifespan and high reliability.
To achieve the above object, the present invention uses following technical proposals：
A kind of protective circuit for direct current power output, it includes regulator circuit, electric current input sampling circuit, precision potentiator electricity
Road, rail-to-rail comparator circuit, D classes flip-flop circuit and output control circuit, electric current input sampling circuit and output control electricity
Road is connected in turn between power input and power supply output；Power input is connect with regulator circuit；Electric current input sampling circuit with
Rail-to-rail comparator circuit connection；Precision potentiator circuit is connect with rail-to-rail comparator circuit；Rail-to-rail comparator circuit and D
Class flip-flop circuit connects；D class flip-flop circuits are connect with output control circuit；
It is that test equipment or equipment are powered that regulator circuit, which exports 3.3V voltages,；Electric current input sampling circuit is by the electric current of input
It is converted to voltage and exports；Precision potentiator circuit sets the value of overcurrent protection electric current by setting voltage value；Rail-to-rail ratio
The voltage of input is compared with the voltage value of setting compared with device circuit, and exports control signal；D classes flip-flop circuit will input
Control signal export and latch；Output control circuit controls switch mosfet by the control signal of input, and by certainly
Restore fuse to protect test equipment or equipment.
Further, regulator circuit includes voltage-stablizer U1,3rd resistor R3, the 9th resistance R9, the first capacitance C1 and second
Capacitance C2, wherein the model LM317L of voltage-stablizer U1.
Using LM317L voltage-stablizers, voltage accuracy 0.1%, temperature drift ranging from 0.7%, input voltage range 5-
32V。
Further, the electric current input sampling circuit of 0.1R/10W includes ten 1R resistance in parallel, and each resistance is adopted
With 2512 encapsulation, precision is 1%, and temperature drift is 20PPM.
It uses ten 1R resistance (it is required that for 2512 encapsulation, 1% precision, 20PPM temperature drifts) in parallel, ensures that all-in resistance precision is
0.1%, when 5A electric currents export, it is 2.5W that electric current input sampling circuit, which consumes power, has used the 1/4 of maximum power, can be with
Ensure the stability of circuit.
Further, precision potentiator circuit includes variable resistance R_ADJ1, the 15th resistance R15 and the 5th capacitance C5,
3296 series of model of wherein variable resistance R_ADJ1.
Further, rail-to-rail comparator circuit includes comparator U3, the 14th resistance R14 and the 4th capacitance C4, wherein
The model MCP6546U of comparator U3.
Using MCP6546U comparators, input voltage range is -0.3V-+0.3V, and maximum input offset voltage is 7mV,
Maximum transmitting time delay is 8uS, it is ensured that test equipment or equipment obtain mA grades of current precision and the response speed of maximum 8uS
Degree.
Further, D classes flip-flop circuit circuit includes D class flip-flop circuit U2 and third capacitance C3, wherein trigger
The model 74HC74 of U2.
Using 74HC74D class flip-flop circuits, high level is exported after the power is turned on, and after rising edge occur in 1CP pins, output is simultaneously
It is locked as low level, maximum transmitting time delay 220nS.
Further, output control circuit includes switch mosfet Q1, the 7th resistance R7 and self-recovery fuse F1, wherein
The model IRF640 of switch mosfet Q1.
It is switched using IRF640MOSFET, maximum switching voltage is 200V, and maximum switching current is 16A, peak response
Time is 130nS, and ensures the reliability of entire circuit using 5A self-recovery fuses.
Advantageous effect：
The present invention is to obtain voltage by current sampling resistor, compared with the voltage value of setting, output control signal, and warp
D class flip-flop circuits are exported and are locked, to control switch mosfet, to realize that current adjustment is protected；The circuit realizes 5-
32V powers, the setting of 0-5A high-precisions adjustable overcurrent protection current value (within 1%), fast response time (maximum 8uS), and
Overcurrent fast cut-off circuit the functions such as re-powers next time until the test equipment or equipment, and life and reliability obtains greatly
Raising.
Description of the drawings
Fig. 1 is the system application block diagram of the present invention；
Fig. 2 is the protective circuit for direct current power output composition frame chart of the present invention；
Fig. 3 is that the power input, electric current input sampling circuit, output control circuit and power supply of one embodiment of the invention are defeated
The circuit diagram gone out；
Fig. 4 is the precision potentiator circuit, rail-to-rail comparator circuit and D class flip-flop circuits of one embodiment of the invention
The circuit diagram of circuit；
In figure：The rail-to-rail comparator electricity of 1- regulator circuits, 2- electric currents input sampling circuit, 3- precision potentiators circuit, 4-
Road, 5-D classes flip-flop circuit, 6- output control circuits, 7- power inputs, the output of 8- power supplys.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
The present invention proposes a kind of protective circuit for direct current power output, as shown in Figure 1, it is mainly used for test equipment or equipment
The place that (power supply output) powers to test product (power input).As shown in Fig. 2, it include regulator circuit 1, electric current input adopt
Sample circuit 2, precision potentiator circuit 3, rail-to-rail comparator circuit 4, D classes flip-flop circuit 5 and output control circuit 6, electric current
Input sampling circuit 2 and output control circuit 6 are connected in turn between power input 7 and power supply output 8；Power input 7 with it is steady
Volt circuit 1 connects；Electric current input sampling circuit 2 is connect with rail-to-rail comparator circuit 4；Precision potentiator circuit 3 with it is rail-to-rail
Comparator circuit 4 connects；Rail-to-rail comparator circuit 4 is connect with D classes flip-flop circuit 5；D classes flip-flop circuit 5 is controlled with output
Circuit 6 processed connects；
It is that test equipment or equipment are powered that regulator circuit 1, which exports 3.3V voltages,；Electric current input sampling circuit 2 is by the electricity of input
Circulation is changed to voltage and exports；Precision potentiator circuit 3 sets the value of overcurrent protection electric current by setting voltage value；It is rail-to-rail
The voltage of input is compared by comparator circuit 4 with the voltage value of setting, and exports control signal；D classes flip-flop circuit 5 will
The control signal of input is exported and is latched；Output control circuit 6 controls switch mosfet by the control signal of input, and leads to
Self-recovery fuse is crossed to protect test equipment or equipment.
Embodiment：
As shown in figure 3, regulator circuit 1 includes LM317L voltage-stablizers U1,3rd resistor R3, the 9th resistance R9, the first capacitance
C1 and the second capacitance C2.The electric current input sampling circuit 2 of 0.1R/10W includes first resistor R1, second resistance R2, the 4th resistance
R4, the 5th resistance R5, the 6th resistance R6, the 8th resistance R8, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12 and
Thirteenth resistor R13, above-mentioned ten 1R resistor coupled in parallel, each resistance are all made of 2512 encapsulation, and precision is 1%, and temperature drift is
20PPM.Output control circuit 6 includes IRF640MOSFET switches Q1, the 7th resistance R7 and self-recovery fuse F1.
As shown in figure 4, precision potentiator circuit 3 includes 3296 serial variable resistance R_ADJ1, the 15th resistance R15 and the
Five capacitance C5.Rail-to-rail comparator circuit 4 includes MCP6546U comparators U3, the 14th resistance R14 and the 4th capacitance C4.D classes
Flip-flop circuit circuit 5 includes 74HC74D class flip-flop circuit U2 and third capacitance C3.
In the present embodiment, it is powered (Fig. 3) to test equipment or equipment by P1 (DC 5-32V inputs), adjustment can power transformation
The resistance value (Fig. 4) for hindering R_ADJ1 measures the voltage (U of P3 by multimeterP3) (Fig. 4), overcurrent protection value=UP3/ 0.1, unit
For ampere；Test equipment or equipment (power supply output) meet P1 (Fig. 3), and test product (power input) connects P2 (Fig. 3), circuit
Work.
Limiting the scope of the invention, those skilled in the art should understand that, in technical scheme of the present invention
On the basis of, the various modifications or variations that can be made by those skilled in the art with little creative work still the present invention's
Within protection domain.
Claims (7)
1. a kind of protective circuit for direct current power output, it includes regulator circuit (1), electric current input sampling circuit (2), accurate current potential
Device circuit (3), rail-to-rail comparator circuit (4), D class flip-flop circuit circuits (5) and output control circuit (6), the electric current
Input sampling circuit (2) and the output control circuit (6) are connected in turn between power input (7) and power supply output (8)；Institute
Power input (7) is stated to connect with the regulator circuit (1)；The electric current input sampling circuit (2) and the rail-to-rail comparator
Circuit (4) connects；The precision potentiator circuit (3) connect with the rail-to-rail comparator circuit (4)；The rail-to-rail comparison
Device circuit (4) is connect with the D classes flip-flop circuit circuit (5)；The D classes flip-flop circuit circuit (5) controls with the output
Circuit (6) connection processed；
Regulator circuit (1) the output 3.3V voltages are that test equipment or equipment are powered；The electric current input sampling circuit (2) will
The electric current of input is converted to voltage and exports；The precision potentiator circuit (3) sets overcurrent protection by setting voltage value
The value of electric current；The voltage of input is compared by the rail-to-rail comparator circuit (4) with the voltage value of setting, and exports control
Signal；The control signal of input is exported and is latched by the D classes flip-flop circuit (5)；The output control circuit (6) is by defeated
The control signal entered protects test equipment or equipment to control switch mosfet by self-recovery fuse.
2. protective circuit for direct current power output according to claim 1, it is characterised in that：The regulator circuit (1) includes
Voltage-stablizer U1,3rd resistor R3, the 9th resistance R9, the first capacitance C1 and the second capacitance C2, the wherein model of voltage-stablizer U1
LM317L。
3. protective circuit for direct current power output according to claim 1, it is characterised in that：The electric current of 0.1R/10W is defeated
It includes ten 1R resistance in parallel to enter sample circuit (2), and each resistance is all made of 2512 encapsulation, and precision is 1%, and temperature drift is
20PPM。
4. protective circuit for direct current power output according to claim 1, it is characterised in that：The precision potentiator circuit
(3) include variable resistance R_ADJ1, the 15th resistance R15 and the 5th capacitance C5, the wherein model of variable resistance R_ADJ1
3296 series.
5. protective circuit for direct current power output according to claim 1, it is characterised in that：The rail-to-rail comparator circuit
(4) include comparator U3, the 14th resistance R14 and the 4th capacitance C4, wherein the model MCP6546U of comparator U3.
6. protective circuit for direct current power output according to claim 1, it is characterised in that：The D classes flip-flop circuit electricity
Road (5) includes D class flip-flop circuit U2 and third capacitance C3, wherein the model 74HC74 of trigger U2.
7. protective circuit for direct current power output according to claim 1, it is characterised in that：The output control circuit (6)
Including switch mosfet Q1, the 7th resistance R7 and self-recovery fuse F1, wherein the model IRF640 of switch mosfet Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810476725.6A CN108666969B (en) | 2018-05-18 | 2018-05-18 | DC power supply output protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810476725.6A CN108666969B (en) | 2018-05-18 | 2018-05-18 | DC power supply output protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108666969A true CN108666969A (en) | 2018-10-16 |
| CN108666969B CN108666969B (en) | 2024-05-17 |
Family
ID=63776653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810476725.6A Active CN108666969B (en) | 2018-05-18 | 2018-05-18 | DC power supply output protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108666969B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993933A (en) * | 2021-04-22 | 2021-06-18 | 宜宾听点科技有限公司 | Self-recovery protection circuit and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN203026904U (en) * | 2012-12-14 | 2013-06-26 | Tcl空调器(中山)有限公司 | Over-current protection circuit and PFC (power factor correction) control circuit with same |
| CN106486963A (en) * | 2016-11-25 | 2017-03-08 | 西安微电子技术研究所 | A kind of star Flouride-resistani acid phesphatase self-recovering type excessively stream/short-circuit protection circuit |
| CN208226546U (en) * | 2018-05-18 | 2018-12-11 | 常州星宇车灯股份有限公司 | A kind of protective circuit for direct current power output |
-
2018
- 2018-05-18 CN CN201810476725.6A patent/CN108666969B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN203026904U (en) * | 2012-12-14 | 2013-06-26 | Tcl空调器(中山)有限公司 | Over-current protection circuit and PFC (power factor correction) control circuit with same |
| CN106486963A (en) * | 2016-11-25 | 2017-03-08 | 西安微电子技术研究所 | A kind of star Flouride-resistani acid phesphatase self-recovering type excessively stream/short-circuit protection circuit |
| CN208226546U (en) * | 2018-05-18 | 2018-12-11 | 常州星宇车灯股份有限公司 | A kind of protective circuit for direct current power output |
Non-Patent Citations (1)
| Title |
|---|
| 郝宪锋;成向阳;: "一种带多重保护的高压功率放大器", 测控技术, no. 09, 18 September 2015 (2015-09-18) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993933A (en) * | 2021-04-22 | 2021-06-18 | 宜宾听点科技有限公司 | Self-recovery protection circuit and device |
| CN112993933B (en) * | 2021-04-22 | 2021-08-17 | 宜宾听点科技有限公司 | Self-recovery protection circuit and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108666969B (en) | 2024-05-17 |
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