CN106997220B - Delayed power circuit - Google Patents
Delayed power circuit Download PDFInfo
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- CN106997220B CN106997220B CN201710197501.7A CN201710197501A CN106997220B CN 106997220 B CN106997220 B CN 106997220B CN 201710197501 A CN201710197501 A CN 201710197501A CN 106997220 B CN106997220 B CN 106997220B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/562—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices with a threshold detection shunting the control path of the final control device
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of delayed power circuits, including LDO circuit module, control circuit module to connect module with power supply；Wherein, LDO circuit module includes at least two LDO circuits in parallel, converts input voltage into predeterminated voltage by LDO circuit；Control circuit module includes delayed protection circuit; it includes corresponding the socket circuit being connected with delayed protection circuit that power supply, which connects module; delayed protects the number of circuit corresponding with the number of LDO circuit; predeterminated voltage is input in delayed protection circuit, is successively powered on by the socket circuit that delayed protects circuit control to protect circuit to be connected with delayed.It can be improved the highly-safe of the utilization rate of power supply output, the energization testing cost of reduction product and product test through the invention.
Description
Technical field
The present invention relates to power technique fields, more specifically, are related to a kind of delayed power circuit.
Background technique
In traditional product energization reliability test, generally require tens of or even hundreds of products in specific environment (example
Such as, the environment such as high temperature and humidity) under for a long time be powered operation, to verify the stability of product.High-power product does such reliability
Very big operating current is needed when test, when especially multiple products power on simultaneously, the starting current needed is usually work
Make the several times of electric current；In addition, product energization reliability test to the stability and overcurrent and overheating protection of power-supply system require also compared with
It is high.
There are mainly two types of the existing common power source designs of product energization reliability test, and one is use DC-DC
(Direct Current-Direct Current, DC-DC) power module is big with power supply conversion efficiency height, power
The advantages of, but its output ripple and switch noise are larger, and higher cost；Another kind is using LDO (Low Dropout
Regulator, low pressure work linear voltage regulator) mode provides power supply, but the power supply conversion ratio for using such mode to provide is low, output
Power is small, cost is high and without overcurrent and overheating protection.
Currently, tested simultaneously for multiple products, frequently with scheme there are mainly two types of, one is for each product it is independent
Power supply circuit is designed, but the system integration rate of such method is low, volume is larger, and since product starting current is operating current
Several times, therefore, power supply output utilization rate when working normally after product starting are extremely low；Another kind is to be using D.C. regulated power supply
All test products provide power supplys, but such mode is when measuring multiple products, extremely to the output of D.C. regulated power supply
Current capacity requirement is high, and especially in multiple products, powered on moment, the starting current that pole needs usually require to reach several simultaneously
Hundred amperes, therefore, such D.C. regulated power supply involves great expense, this undoubtedly will increase the production cost of enterprise.
Summary of the invention
In view of the above problems, the present invention provides a kind of delayed power circuit, to solve existing to lead to product
The power supply output problem that utilization rate is low, testing cost is high of electric reliability test.
Delayed power circuit provided by the invention, including LDO circuit module, control circuit module connect mould with power supply
Block；Wherein, LDO circuit module includes at least two LDO circuits in parallel, is converted input voltage by LDO circuit default
Voltage；Control circuit module includes delayed protection circuit, and it includes protecting circuit one by one with delayed that power supply, which connects module,
Corresponding connected socket circuit, delayed protect the number of circuit corresponding with the number of LDO circuit, and predeterminated voltage is input to
Delayed is protected in circuit, the socket circuit for protecting circuit control and delayed protection circuit to be connected by delayed according to
It is secondary to power on.
Furthermore it is preferred that structure are as follows: LDO circuit includes LDO chip, self-recovery fuse, filter capacitor and bleeder circuit；
Wherein, LDO chip is for converting input voltage into predeterminated voltage；Self-recovery fuse is used to carry out overcurrent guarantor to LDO circuit
Shield；Filter capacitor is for being filtered LDO circuit；Bleeder circuit is for making LDO circuit export accurate predeterminated voltage.
Furthermore it is preferred that structure are as follows: LDO circuit further includes the first indicating circuit, and the first indicating circuit is used to indicate LDO electricity
Whether the output voltage on road is normal；Wherein, when the output voltage of LDO circuit is normal, the LED in the first indicating circuit is by point
It is bright.
Furthermore it is preferred that structure are as follows: further include and the concatenated reverse protection diode of LDO circuit；Wherein, reverse protection two
The quantity and LDO circuit of pole pipe correspond.
Furthermore it is preferred that structure are as follows: delayed protect circuit include by field-effect tube Q1, triode Q3, resistance R3, electricity
Hinder the power-up time delay circuit of R8 and capacitor C3 composition；Wherein, resistance R3, resistance R8 and capacitor C3 are for carrying out socket circuit
Electric delays time to control, field-effect tube Q1 realize the on-off control of power supply under the control of triode Q3；Wherein, it is powered in socket circuit
Moment, capacitor C3 short circuit, triode Q3 is in off state, to control field-effect tube Q1 shutdown；It is powered in socket circuit
Afterwards, triode Q3 enters saturation conduction state, to control field-effect tube Q1 conducting.
Furthermore it is preferred that structure are as follows: delayed protect circuit include being made of resistance R4, resistance R10 and triode Q4
Overheating protection circuit；Wherein, resistance R4 is used to monitor the temperature of delayed protection circuit, when delayed protection circuit
When temperature is more than preset threshold, triode Q4 conducting, triode Q3 cut-off, to control field-effect tube Q1 shutdown.
Furthermore it is preferred that structure are as follows: delayed protect circuit include by resistance R1, resistance R9, resistance R7 and triode
The current foldback circuit of Q2, triode Q5 composition；Wherein, when the electric current for flowing through resistance R1 is more than predetermined current threshold, three poles
Pipe Q2, triode Q5 are in the conductive state, triode Q3 cut-off, to control field-effect tube Q1 shutdown.
Furthermore it is preferred that structure are as follows: delayed protection circuit includes filter circuit, and filter circuit is for making delayed
The voltage for protecting circuit output stable.
Furthermore it is preferred that structure are as follows: delayed protection circuit include be made of resistance R6 and diode D6 second refer to
Show whether circuit, the output voltage that the second indicating circuit is used to indicate delayed protection circuit are normal；Wherein, in delayed
When protecting the output voltage of circuit normal, the LED in the second indicating circuit is lit.
Energization reliability test of the delayed power circuit provided by the invention in a large amount of high-power low-voltage direct products
In have apparent advantage the high-power output of circuit is realized by using multipath LDO circuit parallel connection compared with prior art,
Improve the utilization rate of power supply fan-out capability；Meanwhile circuit is protected by delayed, so that test product successively powers on, such as
This, high current demand needed for not only having realized electrifying startup, but also improve the utilization rate of power supply output when product works normally, drop
Low testing cost；In addition, delayed protection circuit is provided with overcurrent and overheating protection circuit, there is overcurrent or mistake in circuit
It is automatically cut off the power when heat anomaly, protects test macro, until after test macro is restored, automatic control power supply access, to have
The safety for improving product test of effect.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention include be particularly described below and
The feature particularly pointed out in claim.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.
However, these aspects indicate only usable some of the various ways in the principles of the present invention.In addition, of the invention
It is intended to include all such aspects and their equivalent.
Detailed description of the invention
According to following detailed descriptions carried out referring to attached drawing, above and other objects, features and advantages of the invention will become
It must become apparent.In the accompanying drawings:
Fig. 1 is the electrical block diagram according to the delayed power circuit of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram according to the LDO circuit of the delayed power circuit of the embodiment of the present invention；
Fig. 3 is the structural representation that circuit is protected according to the delayed of the delayed power circuit of the embodiment of the present invention
Figure.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific embodiment
Each embodiment of the invention is described below with reference to accompanying drawings.
The electric current pole needed for aforementioned existing, powered on moment low to the power utilization rate of product energization reliability test
Greatly, the problems such as power supply involves great expense, the present invention is in parallel by carrying out multipath LDO circuit, while designing control circuit module
Realization powers on the delay of energization test product, so that high starting current required for avoiding product while powering on, improves power supply
Output utilization rate；In addition, overcurrent, overheating protection are also devised in control circuit module, so that the operation of power supply is more pacified
Entirely, more reliable, and then improve the safety to product energization reliability test.
Wherein, delayed power circuit provided by the invention includes that LDO circuit module, control circuit module and power supply connect
Logical module.Wherein, LDO circuit module includes at least two LDO circuits in parallel, is converted input voltage by LDO circuit
Predeterminated voltage；Control circuit module includes delayed protection circuit, and it includes protecting circuit with delayed that power supply, which connects module,
Connected socket circuit is corresponded, delayed protects the number of circuit corresponding with the number of LDO circuit, and predeterminated voltage is defeated
Enter to powering in delay protection circuit, the socket road for protecting circuit control to be connected with delayed protection circuit by delayed
Successively power on.
The delayed power circuit provided for the present invention will be described in detail, Fig. 1 are shown on according to an embodiment of the present invention
The circuit structure of electricity delay power circuit；Fig. 2 shows the LDO circuits of delayed power circuit according to an embodiment of the present invention
Structure；Fig. 3 shows the structure of the delayed protection circuit of delayed power circuit according to an embodiment of the present invention.
Specifically, as shown in Figure 1, LDO circuit module is made of 5 LDO circuits (LDO0~LDO4) in parallel.Wherein,
J1 is+5V power input interface, each LDO circuit and a reverse protection Diode series, then carries out parallel connection again, with protection
LDO circuit is not damaged after parallel connection.That is: LDO0 connects with reverse protection diode D1, LDO1 and reverse protection diode D2
Series connection, LDO2 connects with reverse protection diode D3, LDO3 connects with reverse protection diode D4, two pole LDO4 and reverse protection
Pipe D5 series connection, then each LDO circuit is carrying out parallel connection after respective reverse protection diode respectively.
Wherein, LDO0~LDO4 be identical LDO circuit, wherein LDO circuit include LDO chip, self-recovery fuse,
Filter capacitor and bleeder circuit；Wherein, LDO chip is for converting input voltage into predeterminated voltage；Self-recovery fuse is used for
Overcurrent protection is carried out to LDO circuit；Filter capacitor is for being filtered LDO circuit；Bleeder circuit is for making LDO circuit
Export accurate predeterminated voltage.In addition, LDO circuit can also include the first indicating circuit, which is used to indicate
Whether the output voltage of LDO circuit is normal, wherein the LED when the output voltage of LDO circuit is normal, in the first indicating circuit
(Light Emitting Diode, light emitting diode) is lit.
For particular circuit configurations as shown in Fig. 2, in LDO circuit structure shown in Fig. 2, U1 is LDO chip, passes through the chip
It can be realized and+5V voltage is converted into+4.2V voltage.F1 is self-recovery fuse, when the electric current in LDO circuit is excessive, is led to
Overcurrent protection can be realized by crossing F1.For example, F1 is then in an off state, works as electricity when the electric current for flowing through F1 is more than a certain preset threshold
After stream restores normal, F1 restores normal ON state.Capacitor C11~C13 is filter capacitor, to filter out the interference in LDO circuit
Signal, to guarantee the clean of power supply；R11 and R12 is bleeder circuit, which is all made of 1% high precision electro
Resistance, so as to guarantee that LDO circuit exports accurately+4.2V voltage；R13 and light emitting diode D7 forms the first indicating circuit,
When LDO output voltage is normal, light emitting diode D7 is lighted.Wherein, R13 is used to carry out the electric current for flowing through light emitting diode D7
Limitation, so that light emitting diode D7 be protected normally to light.
+ 5V the voltage of input enters control circuit module after LDO circuit is converted to+4.2V.Wherein, with LDO circuit mould
LDO circuit in block is corresponding, control circuit module equally by 5 identical delayeds protection circuits (CONTROL0~
CONTROL4 it) forms, delayed protects the structure of circuit as shown in Figure 3.
In delayed protection circuit shown in Fig. 3, by field-effect tube Q1, triode Q3, resistance R3, resistance R8 and electricity
Hold C3 and forms power-up time delay circuit；Wherein, resistance R3, resistance R8 and capacitor C3 are used to carry out delayed control to socket circuit
System, field-effect tube Q1 realize the on-off control of power supply under the control of triode Q3.Specifically, in socket circuit powered on moment,
Capacitor C3 short circuit, triode Q3 are in off state, to control field-effect tube Q1 shutdown；After socket circuit powers on, three
Pole pipe Q3 enters saturation conduction state, to control field-effect tube Q1 conducting.That is, field-effect tube Q1 is as derailing switch
Part is realized under the control of triode Q3 and is controlled the on-off of power supply；Resistance R3, resistance R8 and capacitor C3 realize delayed
Control, in socket circuit powered on moment, capacitor C3 is equivalent to short circuit, and triode Q3 base voltage is 0V, and triode Q3, which is in, to be cut
Only state, so that field-effect tube Q1 power cutoff, with the charging of capacitor C3, triode Q3 enters saturation conduction state,
So that field-effect tube Q1 power supply is connected.According to formula t=(R3+R8) * C3, the size of t is adjusted by parts selection, thus
Realization powers on socket circuit successively.For example, the resistance-capacitance circuit charge and discharge time is t=(3~5) RC, then t=(3~5) 1K*
100uF=300ms~500ms.
Further, it in above-mentioned delayed protection circuit, was made of resistance R4, resistance R10 and triode Q4
Thermal protection circuit, resistance R4 are CTR resistance, by realizing the excessively high protection of temperature using the negative resistance catastrophe characteristics of CTR resistance.?
That is resistance R4 is used to monitor the temperature of delayed protection circuit, when the temperature of delayed protection circuit is more than default
When threshold value, triode Q4 conducting, triode Q3 cut-off, to control field-effect tube Q1 shutdown.
In addition, above-mentioned delayed protection circuit further includes by resistance R1, resistance R9, resistance R7 and triode Q2, three
The current foldback circuit of pole pipe Q5 composition；Wherein, when the electric current for flowing through resistance R1 is more than predetermined current threshold, triode Q2,
Triode Q5 is in the conductive state, triode Q3 cut-off, to control field-effect tube Q1 shutdown.Wherein, above-mentioned current threshold with
The operating voltage of triode Q2 is related, for example, when the operating voltage of triode Q2 is more than 0.7V, triode Q3 cut-off；Work as stream
After the electric current of resistance R1 restores normal, triode Q2, triode Q5 are in off state, at triode Q3 and field-effect tube Q1
In on state, to restart power supply.
Further, above-mentioned delayed protection circuit further includes filter circuit, filtered electrical routing capacitance C1, capacitor C2
Composition, for filtering out the interference signal in delayed protection circuit, the voltage for keeping delayed protection circuit output stable.Separately
Outside, above-mentioned delayed protection circuit further includes the second indicating circuit being made of resistance R6 and diode D6, the second instruction electricity
Whether the output voltage that road is used to indicate delayed protection circuit is normal；Wherein, in the output electricity of delayed protection circuit
When positive pressure is normal, the LED in the second indicating circuit is lit.
In addition, it also includes 5 socket circuits (MODULE1~MODULE5) that above-mentioned power supply, which connects module, wherein each
Socket circuit is respectively connected with a delayed protection circuit.That is, MODULE1 is connected with CONTROL0, MODULE2
It is connected with CONTROL1, MODULE3 is connected with CONTROL2, MODULE4 is connected with CONTROL3, MODULE5 and CONTROL4
It is connected, protects the control of circuit to realize successively powering on to socket circuit by delayed.
By above-mentioned it is found that delayed power circuit provided by the invention has the advantage that
1, the delay of product is powered on by control circuit module realization, also, prolonged according to being powered in control circuit module
When protect the design of circuit, successively product can be powered on, high starting current required for avoiding powering on simultaneously produces simultaneously
The electric current that LDO circuit output in parallel can be shared after product starting, utilizes LDO circuit efficiently；
2, LDO circuit design has self-recovery fuse, when there is over-current phenomenon avoidance in single LDO circuit, self-recovery fuse
Can auto power off to protect circuit, will continue to power after electric current restores normal, make that power supply operation is safer, more may be used
It leans on；
3, it is provided with current foldback circuit in delayed protection circuit, when delayed protects circuit or test product
When there is throat floater, current foldback circuit meeting auto power off, so that test product is protected, until circuit restores normal
Afterwards, current foldback circuit can restore power supply automatically, so that throat floater is crossed by delayed protection circuit protection single product,
It avoids shutdown LDO circuit and influences output power of power supply；
4, delayed protection circuit is provided with overheating protection circuit, when circuit temperature is excessively high, meeting auto power off,
To protect test macro, the turn on automatically power supply after temperature restores normal, to improve the safety of test；
5, LDO circuit and delayed protection circuit in be provided with indicating circuit, when test when something goes wrong, LED
Lamp can extinguish, so that tester be made to understand the operating status of test macro in time.
Although describing each embodiment according to the present invention above with reference to figure to be described, those skilled in the art
Member can also do it should be appreciated that each embodiment proposed to aforementioned present invention on the basis of not departing from the content of present invention
Various improvement out.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (8)
1. a kind of delayed power circuit, comprising: LDO circuit module, control circuit module connect module with power supply；Wherein,
The LDO circuit module includes at least two LDO circuits in parallel, is converted input voltage by the LDO circuit
Predeterminated voltage；
The control circuit module includes delayed protection circuit, and it includes protecting with the delayed that the power supply, which connects module,
Protection circuit corresponds connected socket circuit, the number and the number phase of the LDO circuit of the delayed protection circuit
Corresponding, the predeterminated voltage is input in the delayed protection circuit, by the delayed protect circuit control with
The connected socket circuit of the delayed protection circuit successively powers on；
Further include and the concatenated reverse protection diode of the LDO circuit；Wherein,
The quantity of the reverse protection diode and the LDO circuit correspond.
2. delayed power circuit as described in claim 1, wherein
The LDO circuit includes LDO chip, self-recovery fuse, filter capacitor and bleeder circuit；Wherein,
The LDO chip is for converting input voltage into predeterminated voltage；
The self-recovery fuse is used to carry out overcurrent protection to the LDO circuit；
The filter capacitor is for being filtered the LDO circuit；
The bleeder circuit is for making the LDO circuit export accurate predeterminated voltage.
3. delayed power circuit as claimed in claim 2, wherein
The LDO circuit further includes the first indicating circuit, and first indicating circuit is used to indicate the output electricity of the LDO circuit
It whether normal presses；Wherein,
When the output voltage of the LDO circuit is normal, the LED in first indicating circuit is lit.
4. delayed power circuit as described in claim 1, wherein
The delayed protection circuit includes being made of field-effect tube Q1, triode Q3, resistance R3, resistance R8 and capacitor C3
Power-up time delay circuit；Wherein,
The resistance R3, resistance R8 and capacitor C3 are used to carry out delayed control, the field-effect tube to the socket circuit
Q1 realizes the on-off control of power supply under the control of triode Q3；Wherein,
In the socket circuit powered on moment, the capacitor C3 short circuit, the triode Q3 is in off state, to control institute
State field-effect tube Q1 shutdown；
After the socket circuit powers on, the triode Q3 enters saturation conduction state, to control the field-effect tube
Q1 conducting.
5. delayed power circuit as claimed in claim 4, wherein
The delayed protection circuit includes the overheating protection circuit being made of resistance R4, resistance R10 and triode Q4；Its
In,
The resistance R4 is used to monitor the temperature of the delayed protection circuit, when the temperature of delayed protection circuit
When more than preset threshold, the triode Q4 conducting, the triode Q3 cut-off, to control the field-effect tube Q1 shutdown.
6. delayed power circuit as claimed in claim 5, wherein
The delayed protection circuit includes the mistake being made of resistance R1, resistance R9, resistance R7 and triode Q2, triode Q5
Stream protection circuit；Wherein,
When the electric current for flowing through the resistance R1 is more than predetermined current threshold, the triode Q2, triode Q5 are on shape
State, the triode Q3 cut-off, to control the field-effect tube Q1 shutdown.
7. delayed power circuit as claimed in claim 6, wherein
The delayed protection circuit includes filter circuit, and the filter circuit is defeated for making the delayed protection circuit
Stable voltage out.
8. delayed power circuit as claimed in claim 7, wherein
The delayed protection circuit includes the second indicating circuit being made of resistance R6 and diode D6, second instruction
Whether the output voltage that circuit is used to indicate the delayed protection circuit is normal；Wherein,
When the output voltage of delayed protection circuit is normal, the LED in second indicating circuit is lit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197501.7A CN106997220B (en) | 2017-03-29 | 2017-03-29 | Delayed power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197501.7A CN106997220B (en) | 2017-03-29 | 2017-03-29 | Delayed power circuit |
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| CN106997220A CN106997220A (en) | 2017-08-01 |
| CN106997220B true CN106997220B (en) | 2019-02-26 |
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| CN113629987A (en) * | 2021-08-03 | 2021-11-09 | 深圳市康佳壹视界商业显示有限公司 | LED screen electrical control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1777005A (en) * | 2004-11-17 | 2006-05-24 | 中兴通讯股份有限公司 | DC/DC power source aligument circuit capable of controlling power-on time and order |
| CN101923110B (en) * | 2009-06-09 | 2012-08-22 | 比亚迪股份有限公司 | Method and device for detecting abnormal current of circuit |
| TWI424301B (en) * | 2009-12-24 | 2014-01-21 | Richwave Technology Corp | Voltage regulator which provides sequentially and arbitrarrily shaped regulated voltage and related method |
| CN102593790B (en) * | 2011-01-05 | 2015-01-07 | 海洋王照明科技股份有限公司 | Lighting fixture overheating protection circuit and lighting fixture thereof |
| CN103683909A (en) * | 2013-12-27 | 2014-03-26 | 广东威创视讯科技股份有限公司 | Display system, power supply method and power supply device thereof |
| CN103760939B (en) * | 2014-01-15 | 2015-12-09 | 小米科技有限责任公司 | Power source supply method, power-supplying circuit, power supply and terminal device |
| US9478977B2 (en) * | 2014-05-27 | 2016-10-25 | Skyworks Solutions, Inc. | Overcurrent protection device and overcurrent protection method for electronic modules |
| CN204668922U (en) * | 2015-05-08 | 2015-09-23 | 深圳长城科美技术有限公司 | A kind of module power supply short-circuit protective circuit |
| CN105356422A (en) * | 2015-10-22 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | Method and system for preventing overcurrent and overvoltage damages in test of electronic equipment |
| CN205231726U (en) * | 2015-12-02 | 2016-05-11 | 深圳怡化电脑股份有限公司 | Power protection circuit with go up electric protection |
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Effective date of registration: 20201013 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: GOERTEK Inc. |
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