CN202772791U - Short circuit protection circuit used for parallel connection power supply - Google Patents
Short circuit protection circuit used for parallel connection power supply Download PDFInfo
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- CN202772791U CN202772791U CN 201220405304 CN201220405304U CN202772791U CN 202772791 U CN202772791 U CN 202772791U CN 201220405304 CN201220405304 CN 201220405304 CN 201220405304 U CN201220405304 U CN 201220405304U CN 202772791 U CN202772791 U CN 202772791U
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- 238000001914 filtration Methods 0.000 claims description 38
- 230000001360 synchronised effect Effects 0.000 claims description 30
- 230000005669 field effect Effects 0.000 claims description 26
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 230000002441 reversible effect Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
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- 229910044991 metal oxide Inorganic materials 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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Abstract
The utility model relates to the field of power supply technology, in particular to a short circuit protection circuit used for a parallel connection power supply, comprising a power supply module, an over-current protection module, a comparison module, a switch module and a load module, wherein the output end of the power supply module is electrically connected with the input end of the over-current protection module, the output end of the power supply module is electrically connected with the first input end of the comparison module, the output end of the over-current protection module is electrically connected with the first input end of the switch module, the output end of the switch module is electrically connected with the load module and the second input end of the comparison module respectively, and the output end of the comparison module is electrically connected with the second input end of the switch module.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of short-circuit protection circuit for parallel connection power supply.
Background technology
As shown in Figure 1, existing a kind of short-circuit protection circuit for parallel connection power supply comprises power module M110, synchronous rectification module M120, filtration module M130, overcurrent protection module M140, comparison module M150, switch module M160, load blocks M170.The output of described power module M110 is connected with the input electricity of described synchronous rectification module M120.The output of described synchronous rectification module M120 is connected with the input electricity of described filtration module M130.The output of described filtration module M130 is connected with the input electricity of described overcurrent protection module M140.The output of described overcurrent protection module M140 is connected with the first input end electricity of comparison module M150 respectively, and is connected with the first input end electricity of switch module M160.The output of described switch module M160 is connected with a load blocks M170 electricity respectively, and is connected with the second input electricity of described comparison module M150.The output of described comparison module M150 is connected with the second input electricity of described switch module M160.
As shown in Figure 2, this existing a kind of short-circuit protection circuit for parallel connection power supply comprises power module M110, synchronous rectification module M120, filtration module M130, overcurrent protection module M140, comparison module M150, switch module M160 and load blocks M170.The output of described power module M110 is connected with the input electricity of described synchronous rectification module M120.Wherein, described synchronous rectification module M120 comprises the 3rd diode D278, the 6th resistance R 204, voltage stabilizing didoe ZD201, the 7th resistance R 203 and the second field effect transistor Q201.The input of described synchronous rectification module M120 is connected with the drain electrode electricity of the second field effect transistor Q201 by the 3rd diode D278; External power source+12V_LG by the series connection the 6th resistance R 204 and voltage stabilizing didoe ZD201 after ground connection; Described the 7th resistance R 203 is in parallel with described voltage stabilizing didoe ZD201; The grid of described the second field effect transistor Q201 is connected with source electrode with the two ends electricity of described the 7th resistance R 203 and is connected.The output of described synchronous rectification module M120 is connected with the input electricity of described filtration module M130.Described filtration module M130 comprises inductance L 200, the second capacitor C 212 and the 3rd capacitor C 209.The input of described filtration module M130 is by inductance L 200 and the second capacitor C 212 and the 3rd capacitor C 209 rear ground connection in parallel.The output of described filtration module M130 is connected with described overcurrent protection module M140 electricity.Described overcurrent protection module M140 comprises the 4th resistance R 206A, is also referred to as sense resistance.The end of described the 4th resistance R 206A is connected with the output electricity of described filtration module M130, the other end of described the 4th resistance R 206A is connected with the first input end electricity of described switch module M160 respectively, and is connected with the first input end electricity of described comparison module M150.Described switch module M160 comprises the 5th resistance R 206B1 and the first field effect transistor Q202 of series connection; The output of the first field effect transistor Q202 of described switch module M160 is connected with load blocks M170 electricity respectively, and the reverse input end that is connected to comparator LM393 by the second resistance R 359 electricity of described comparison module M150.Described comparison module M150 comprises the first resistance R 268, the second resistance R 359, the first capacitor C 289, the first diode D274, the second diode D277, the 3rd resistance R 317 and comparator LM393; The first input end of described comparison module M150 is connected with the in the same way input electricity of described comparator LM393 by the first resistance R 268; Described the first capacitor C 289 is connected in parallel in the same way input and the reverse input end of described comparator LM393; The output of described comparator LM393 is by the first diode D274, the second diode D277 and the 3rd resistance R 317 electricity in the same way input that is connected to described comparator LM393 of successively series connection; And the output of described comparator LM393 is connected to one or door control module (ORing-Control) by the first diode D274 electricity.Described or door control module module (ORing-Control) is communicated by letter with one or door module (ORing).Wherein, described ORing-Control is connected with the non-direct electricity of ORing, and namely ORing-Control is connected with ORing electricity by with after the electricity of other circuit is connected again.The output voltage of the input voltage control ORing of ORing-Control.The output of described ORing is connected with the second input electricity of described switch module M160.The output end voltage of described load blocks M170 is set to+12V_BUS.
When many switch power parallels; wherein a power supply inside is short-circuited for a certain reason; common protective device all is to utilize relatively ORing MOSFET(MetalOxide Semicoductor Field Effect Transistor of comparator LM393, metal oxide semiconductor field effect tube) and the voltage difference at two ends (△ V=Id*Rdson=12V_BUS-12VL) to close ORing MOSFET.Be that the inner VIN of power supply (for example is short-circuited; in Fig. 2; Q201 or C209 are short-circuited) time; large electric current from external bus by ORing MOSFET(Q202) pour in down a chimney to inside; only have when electric current arrives greatly to a certain degree; comparator LM393 just can detect enough large voltage difference (△ V=Id*Rdson) and drive to turn off ORing MOSFET, thereby so that power supply is realized protection.Power supply internal short-circuit control block diagram is referring to shown in Figure 1, and circuit diagram is referring to shown in Figure 2.
But, in order to reach energy-conservation purpose, need to raise the efficiency now, so select the conducting resistance Rdson of ORing MOSFET more and more less.Like this, (△ V=Id*Rdson=12V_BUS-12VL) is when turning off ORing MOSFET when utilizing relatively voltage difference of comparator, just needing larger reverse current Id to flow through ORing MOSFET could turn-off it, its result can cause that 12V_BUS voltage drop (dip) is darker, and ORing MOSFET shutdown moment causes that 12V_BUS has very high impulse (spike) voltage simultaneously.Like this, when outage occured power supply, not only short-circuit protection circuit slow movement, and the 12V_BUS voltage of output had and falls, and ORing MOSFET field effect transistor (Q202) turn-off transient can cause that output voltage produces spike.
The utility model content
The utility model purpose is to address the above problem, and a kind of short-circuit protection circuit for parallel connection power supply is provided, and effectively realizes the fast short-circuit protective function of parallel connection power supply, and well keeps the stable of output voltage.
In order to address the above problem, the utility model by the following technical solutions.
A kind of short-circuit protection circuit for parallel connection power supply comprises power module, overcurrent protection module, comparison module, switch module and load blocks; The output of described power module is connected with the input electricity of described overcurrent protection module, and the output of described power module is connected with the first input end electricity of described comparison module; The output of described overcurrent protection module is connected with the first input end electricity of switch module; The output of described switch module is connected with a load blocks electricity respectively, and is connected with the second input electricity of described comparison module; The output of described comparison module is connected with the second input electricity of described switch module.
Further, described short-circuit protection circuit further comprises a synchronous rectification module, and the output of described power module is connected with the input electricity of described synchronous rectification module; The output of described synchronous rectification module is connected with the input of described overcurrent protection module and the first input end electricity of comparison module respectively.
Further, short-circuit protection circuit further comprises a filtration module; The output of described synchronous rectification module is connected with the input electricity of described filtration module, and the output of described filtration module is connected with the input of described overcurrent protection module and the first input end electricity of comparison module respectively.
Further, described comparison module comprises the first resistance, the second resistance, the first electric capacity, the first diode, the second diode, the 3rd resistance and comparator; The first input end of described comparison module is connected with the in the same way input electricity of described comparator by the first resistance; Described the first Capacitance parallel connection is in the same way input and the reverse input end of described comparator; The output of described comparator is connected to the in the same way input of described comparator by the first diode, the second diode and the 3rd resistance electricity of successively series connection; And the output of described comparator is connected to one or door control module by the first diode electricity; Described or door control module and one or the door module communication; Output described or the door module is connected with the second input electricity of described switch module; Described overcurrent protection module comprises the 4th resistance, and an end of the 4th resistance of described overcurrent protection module is connected with the first input end electricity of described switch module; Described switch module comprises the 5th resistance and first field effect transistor of series connection; The output of the first field effect transistor of described switch module is connected with load blocks electricity respectively, and the reverse input end that is connected to described comparator by the second resistance electricity of described comparison module.
Further, described synchronous rectification module comprises the 3rd diode, the 6th resistance, voltage stabilizing didoe, the 7th resistance and the second field effect transistor; The input of described synchronous rectification module is connected with the drain electrode electricity of the second field effect transistor by the 3rd diode; External power source by the series connection the 6th resistance and voltage stabilizing didoe after ground connection; Described the 7th resistance is in parallel with described voltage stabilizing didoe; The grid of described the second field effect transistor is connected with source electrode with the two ends electricity of described the 7th resistance and is connected.
Further, described filtration module comprises inductance, the second electric capacity and the 3rd electric capacity; The input of described filtration module by inductance and in parallel the second electric capacity and the 3rd electric capacity after ground connection.
The utility model has the advantage of, utilize short-circuit protection circuit described in the utility model not only so that output voltage is more stable, and allow to use the ORing MOSFET of less Rdson, the efficient of power supply is optimized.In addition, the utility model can remedy the defective that the comparator input terminal error voltage causes greatly circuit operation time-delay or action accuracy deficiency.Short-circuit protection circuit described in the utility model is with respect to former circuit design, and also not needing increases other components and parts, and low price.
Description of drawings
Fig. 1 is existing power supply internal short-circuit control block diagram;
Fig. 2 is existing power supply internal short-circuit control circuit figure;
Fig. 3 is the embodiment structured flowchart of short-circuit protection circuit described in the utility model;
Fig. 4 is the circuit diagram of the described short-circuit protection circuit of the utility model preferred embodiment;
Fig. 5 is the waveform effect schematic diagram that adopts prior art;
Fig. 6 is the waveform effect schematic diagram that adopts the utility model technology.
Mark among the figure is respectively:
M110, power module; M120, synchronous rectification module; M130, filtration module; M140, overcurrent protection module; M150, comparison module; M160, switch module; M170, load blocks;
M310, power module; M320, synchronous rectification module; M330, filtration module; M340, overcurrent protection module; M350, comparison module; M360, switch module; M370, load blocks.
Embodiment
The embodiment of a kind of short-circuit protection circuit for parallel connection power supply that the utility model is provided below in conjunction with accompanying drawing elaborates.
Referring to shown in Figure 3, a kind of short-circuit protection circuit for parallel connection power supply comprises power module M310, synchronous rectification module M320, filtration module M330, overcurrent protection module M340, comparison module M350, switch module M360, load blocks M370.The output of described power module M310 is connected with the input electricity of described synchronous rectification module M320.The output of described synchronous rectification module M320 is connected with the input electricity of described filtration module M330.The output of described filtration module M330 is connected with the input of described overcurrent protection module M340 and the first input end electricity of comparison module M350 respectively.Direct current after described filtration module M330 is used for changing carries out filtering, and the harmonic component that is about in the large direct voltage of pulsing is removed, and obtains disturbing less level and smooth direct voltage.The output of described overcurrent protection module M340 is connected with the first input end electricity of switch module M360.The output of described switch module M360 is connected with a load blocks M370 electricity respectively, and is connected with the second input electricity of described comparison module M350.The output of described comparison module M350 is connected with the second input electricity of described switch module M360.
Referring to shown in Figure 4, the described short-circuit protection circuit for parallel connection power supply of the utility model preferred embodiment comprises: power module M310, synchronous rectification module M320, filtration module M330, overcurrent protection module M340, comparison module M350, switch module M360 and load blocks M370.The output of described power module M310 is connected with the input electricity of described synchronous rectification module M320.Wherein, the output voltage of described power module M310 (being VIN) can be set to transformer-secondary voltage, and for example, secondary voltage is 13 volts square-wave voltage.Described synchronous rectification module M320 comprises the 3rd diode D278, the 6th resistance R 204, voltage stabilizing didoe ZD201, the 7th resistance R 203 and the second field effect transistor Q201.The input of described synchronous rectification module M320 is connected with the drain electrode electricity of the second field effect transistor Q201 by the 3rd diode D278; External power source+12V_LG by the series connection resistance the 6th R204 and voltage stabilizing didoe ZD201 after ground connection; Described the 7th resistance R 203 is in parallel with described voltage stabilizing didoe ZD201; The grid of described the second field effect transistor Q201 is connected with source electrode with the two ends electricity of described the 7th resistance R 203 and is connected.The output of described synchronous rectification module M320 is connected with the input electricity of described filtration module M330.Described filtration module M330 comprises inductance L 200, the second capacitor C 212 and the 3rd capacitor C 209.The input of described filtration module M330 is by inductance L 200 and the second capacitor C 212 and the 3rd capacitor C 209 rear ground connection in parallel.In other embodiment of the present utility model, described filtration module M330 also can adopt other formula filtering except adopting the filtering of LC formula, for example the passive filtering of RC formula passive filtering, RC formula active power filtering, particular components formation.The output of described filtration module M330 is connected first input end electricity with described overcurrent protection module M310 respectively and is connected with comparison module M350.Described overcurrent protection module M340 comprises the 4th resistance R 206A, is also referred to as sense resistance, is used for described short-circuit protection circuit for parallel connection power supply is played overcurrent protection (Over Current Protection is called for short OCP) effect.The end of described the 4th resistance R 206A is connected with the output electricity of described filtration module M330, and the other end of described the 4th resistance R 206A is connected with the first input end electricity of described switch module M360.Described switch module M360 comprises the 5th resistance R 206B1 and the first field effect transistor Q202 of series connection.The output of the first field effect transistor Q202 of described switch module M360 is connected with load blocks M370 electricity respectively, and the reverse input end (2) that is connected to comparator LM393 by the second resistance R 359 electricity of described comparison module M350.Described comparison module M350 comprises the first resistance R 268, the second resistance R 359, the first capacitor C 289, the first diode D274, the second diode D277, the 3rd resistance R 317 and comparator LM393.The first input end of described comparison module M350 is connected with in the same way input (3) electricity of described comparator LM393 by the first resistance R 268; Described the first capacitor C 289 is connected in parallel in the same way input (3) and the reverse input end (2) of described comparator LM393.The output of described comparator LM393 (1) is by the first diode D274, the second diode D277 and the 3rd resistance R 317 electricity in the same way input (3) that is connected to described comparator LM393 of successively series connection, and the output of described comparator LM393 (1) is connected to one or door control module (ORing-Control) by the first diode D274 electricity.Described or door control module (ORing-Control) is communicated by letter with one or door module (ORing).Wherein, described ORing-Control is connected with the non-direct electricity of ORing, and namely ORing-Control is connected with ORing electricity by with after the electricity of other circuit is connected again.The Voltage-output of the voltage input control ORing of ORing-Control.The output of described ORing is connected with the second input electricity of described switch module M360.The input terminal voltage of described load blocks M370 is set to+12V_BUS.
Referring to Fig. 2 and shown in Figure 4; the utility model changes the anode voltage monitoring point of the comparator LM393 in original circuit+12VZ into by+12VL; be about to sense resistance R 206A also equivalence be MOSFET conduction impedance Rdson(as shown in Figure 2); in Fig. 4, comparator LM393 by detection+12V_BUS and+the voltage difference delta V=Id*(Rdson+R206A of 12VZ)=(+12V_BUS)-(+12VZ) to close ORing MOSFET(Q202) thus realize short-circuit protection.Because the equivalent resistance at the two ends of comparator LM393 (Rdson+R206A) increases, and the equivalent resistance before improving is Rdson, so when the inner abnormal short circuit of power supply, for example field effect transistor Q201 or capacitor C 209 short circuits, only need less reverse current Id to flow through ORing MOSFET, comparator LM393 just can detect larger pressure differential deltap V quickly with the switch of quick control ORingFET, the pressure drop (dip) of output 12V_BUS voltage is just less like this, pulse (spike) voltage of ORing MOSFET shutdown moment 12V_BUS voltage generation also can become less simultaneously, so that output voltage is more stable.
Below will be respectively applied to the waveform effect schematic diagram that adopts prior art is described by Fig. 5 and Fig. 6, and adopt waveform effect schematic diagram of the present utility model.
For the described user that parallel power supply system is arranged, wish that the BUS voltage that requires power-supply system to export keeps stable under most of conditions, to guarantee the stability of custom system.When even a power supply is short-circuited therein, also require the BUS voltage of output that very large fluctuation can not be arranged.Two in parallel uses of power supply, when wherein a power supply was short-circuited, experimental waveform as shown in Figure 5 and Figure 6 to record improvement front and back (prior art and the utility model).
Fig. 5 is for adopting the waveform effect schematic diagram of prior art, the waveform before namely improving.A solid line in the waveform (5 μ s 1V) is the actual signal of 12V_BUS voltage, used triggering signal during another solid line (5 μ s 5V) expression crawl waveform, ORing MOSFET gate terminal voltage signal (referring to the first field effect transistor Q202 shown in Figure 2) namely, X-axis represents the time among the figure, and Y-axis represents the unit scales of voltage.As can see from Figure 5, when short circuit occured, the voltage fluctuation of 12V_BUS was very large, and maximum is 13.4V, and minimum value is 11.18V.Like this, can impact custom system.
Fig. 6 is for adopting the waveform effect figure of the utility model technology, the waveform after namely improving.A solid line in the waveform (5 μ s 1V) is the actual signal of 12V_BUS voltage, used triggering signal during another solid line (5 μ s 5V) expression crawl waveform, namely ORing MOSFET gate terminal voltage signal (referring to the first field effect transistor Q202 shown in Figure 4).As can see from Figure 6, when short circuit occured, the voltage fluctuation of 12V_BUS had reduced a lot, and maximum is 12.03V, and minimum value is 11.66V, satisfied the custom system of high requirement and used.Therefore, utilize short-circuit protection circuit described in the utility model not only so that output voltage is more stable, and allow to use the ORing MOSFET of less Rdson, the efficient of power supply is optimized.In addition, the utility model can remedy comparator because voltage causes greatly circuit operation time-delay or the not enough defective of action accuracy.Short-circuit protection circuit described in the utility model did not need to increase other components and parts with respect to former circuit design yet.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model structure; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1. a short-circuit protection circuit that is used for parallel connection power supply is characterized in that, comprises power module, overcurrent protection module, comparison module, switch module and load blocks; The output of described power module is connected with the input electricity of described overcurrent protection module, and the output of described power module is connected with the first input end electricity of described comparison module; The output of described overcurrent protection module is connected with the first input end electricity of switch module; The output of described switch module is connected with a load blocks electricity respectively, and is connected with the second input electricity of described comparison module; The output of described comparison module is connected with the second input electricity of described switch module.
2. the short-circuit protection circuit for parallel connection power supply as claimed in claim 1 is characterized in that, further comprises a synchronous rectification module, and the output of described power module is connected with the input electricity of described synchronous rectification module; The output of described synchronous rectification module is connected with the input of described overcurrent protection module and the first input end electricity of comparison module respectively.
3. the short-circuit protection circuit for parallel connection power supply as claimed in claim 2 is characterized in that, further comprises a filtration module; The output of described synchronous rectification module is connected with the input electricity of described filtration module, and the output of described filtration module is connected with the input of described overcurrent protection module and the first input end electricity of comparison module respectively.
4. the short-circuit protection circuit for parallel connection power supply as claimed in claim 3 is characterized in that, described comparison module comprises the first resistance, the second resistance, the first electric capacity, the first diode, the second diode, the 3rd resistance and comparator; The first input end of described comparison module is connected with the in the same way input electricity of described comparator by the first resistance; Described the first Capacitance parallel connection is in the same way input and the reverse input end of described comparator; The output of described comparator is connected to the in the same way input of described comparator by the first diode, the second diode and the 3rd resistance electricity of successively series connection, and the output of described comparator is connected to one or door control module by the first diode electricity; Described or door control module and one or the door module communication; Output described or the door module is connected with the second input electricity of described switch module; Described overcurrent protection module comprises the 4th resistance, and an end of the 4th resistance of described overcurrent protection module is connected with the first input end electricity of described switch module; Described switch module comprises the 5th resistance and first field effect transistor of series connection; The output of the first field effect transistor of described switch module is connected with load blocks electricity respectively, and the reverse input end that is connected to described comparator by the second resistance electricity of described comparison module.
5. the short-circuit protection circuit for parallel connection power supply as claimed in claim 4 is characterized in that, described synchronous rectification module comprises the 3rd diode, the 6th resistance, voltage stabilizing didoe, the 7th resistance and the second field effect transistor; The input of described synchronous rectification module is connected with the drain electrode electricity of the second field effect transistor by the 3rd diode; External power source by the series connection the 6th resistance and voltage stabilizing didoe after ground connection; Described the 7th resistance is in parallel with described voltage stabilizing didoe; The grid of described the second field effect transistor is connected with source electrode with the two ends electricity of described the 7th resistance and is connected.
6. the short-circuit protection circuit for parallel connection power supply as claimed in claim 5 is characterized in that, described filtration module comprises inductance, the second electric capacity and the 3rd electric capacity; The input of described filtration module by inductance and in parallel the second electric capacity and the 3rd electric capacity after ground connection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405304 CN202772791U (en) | 2012-08-16 | 2012-08-16 | Short circuit protection circuit used for parallel connection power supply |
| TW101218621U TWM455287U (en) | 2012-08-16 | 2012-09-26 | Short circuit protection circuit for parallel power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220405304 CN202772791U (en) | 2012-08-16 | 2012-08-16 | Short circuit protection circuit used for parallel connection power supply |
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| Publication Number | Publication Date |
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| CN202772791U true CN202772791U (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220405304 Expired - Lifetime CN202772791U (en) | 2012-08-16 | 2012-08-16 | Short circuit protection circuit used for parallel connection power supply |
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| Country | Link |
|---|---|
| CN (1) | CN202772791U (en) |
| TW (1) | TWM455287U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917153A (en) * | 2015-05-26 | 2015-09-16 | 谈宁 | Short circuit protection circuit used for parallel-connected power supply |
| CN106208650A (en) * | 2016-07-28 | 2016-12-07 | 刘勇 | A kind of current protecting circuit and power circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6294061B2 (en) * | 2013-11-29 | 2018-03-14 | ローム株式会社 | Short circuit protection circuit |
| JP6381975B2 (en) * | 2014-06-04 | 2018-08-29 | デクセリアルズ株式会社 | Short circuit element |
-
2012
- 2012-08-16 CN CN 201220405304 patent/CN202772791U/en not_active Expired - Lifetime
- 2012-09-26 TW TW101218621U patent/TWM455287U/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917153A (en) * | 2015-05-26 | 2015-09-16 | 谈宁 | Short circuit protection circuit used for parallel-connected power supply |
| CN106208650A (en) * | 2016-07-28 | 2016-12-07 | 刘勇 | A kind of current protecting circuit and power circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM455287U (en) | 2013-06-11 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20201224 Address after: 523290 hetianxia village, Shijie Town, Dongguan City, Guangdong Province Patentee after: DELTA ELECTRONICS (DONGGUAN) Co.,Ltd. Address before: 523308 Xincheng District, Shijie Town, Dongguan City, Guangdong Province Patentee before: DELTA ELECTRONICS POWER (DONG GUAN) Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130306 |