CN204597446U - Based on power circuit and the electronic product of resettable fuse - Google Patents
Based on power circuit and the electronic product of resettable fuse Download PDFInfo
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- CN204597446U CN204597446U CN201520286497.8U CN201520286497U CN204597446U CN 204597446 U CN204597446 U CN 204597446U CN 201520286497 U CN201520286497 U CN 201520286497U CN 204597446 U CN204597446 U CN 204597446U
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Abstract
The utility model discloses a kind of power circuit based on resettable fuse and electronic product, resettable fuse primary path, resettable fuse stand-by channel and voltage detecting circuit is provided with in described power circuit, described resettable fuse primary path and resettable fuse stand-by channel are in parallel, and are connected in the supply line carrying described input power; Described voltage detecting circuit detects the voltage difference at the resettable fuse two ends in resettable fuse primary path, and transfers to described circuit system, controls described primary path or stand-by channel connection by circuit system.The utility model is by design resettable fuse primary path and stand-by channel, the life cycle of the electronic product applying resettable fuse can be made to extend, and avoid that the rush of current born because of resettable fuse is excessive, overlong time and pressure drop above the fuse that causes is excessive, the unstable or inoperable phenomenon of the system cloud gray model then caused occurs.
Description
Technical field
The utility model belongs to power circuit technical field, specifically, relates to a kind of power circuit adopting resettable fuse to design and the electronic product applying the design of this power circuit.
Background technology
Resettable fuse PTC is a kind of overflow protecting element, automatically can disconnect when input current is excessive, cuts off input power, to prevent from causing damage to circuit system because input current is excessive.Further, this fuse can recover normal rear automatically closed at input current, recloses the current supply circuit of input power, realizes recycling.
In the power circuit using resettable fuse PTC design, when utilizing resettable fuse to carry out overcurrent protection, often there will be along with fuse is hit increasing of number of times, the problem that the resistance of fuse increases.If the electric current that electronic product itself needs is very large, a larger pressure drop will be produced on resettable fuse, so stricter electronic product is required for supply power voltage, the supply power voltage being input to circuit system will be caused significantly to reduce because the dividing potential drop of resettable fuse is excessive, then have influence on the normal operation of circuit system, even occur the inoperable phenomenon of electronic product.
Summary of the invention
The utility model causes because self resistance increases the problem that circuit system cannot normally run in order to solve resettable fuse in prior art, propose a kind of power circuit based on resettable fuse design, by carrying out backup design to resettable fuse, and automatically switch to backup fuse when resistance problems of too appears in conventional fuse silk, thus ensure that the normal electricity consumption of circuit system.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Based on a power circuit for resettable fuse, described power circuit receives input power also for circuit system is powered; Resettable fuse primary path, resettable fuse stand-by channel and voltage detecting circuit is provided with in described power circuit, described resettable fuse primary path and resettable fuse stand-by channel are in parallel, and are connected in the supply line carrying described input power; Described voltage detecting circuit detects the voltage difference at the resettable fuse two ends in resettable fuse primary path, and transferring to described circuit system, one of them being controlled described resettable fuse primary path and resettable fuse stand-by channel by circuit system is communicated with.
Further, resettable fuse and switching circuit is provided with in described resettable fuse primary path and resettable fuse stand-by channel, described circuit system generates switch controlling signal according to the described voltage difference collected, export the switching circuit described in two to, by controlling the switching circuit break-make described in two, one of them controlling described resettable fuse primary path and resettable fuse stand-by channel is communicated with.
As a kind of preferred circuit design of described resettable fuse primary path, in described primary path, be connected to by resettable fuse between input power and switching circuit, described switching circuit comprises the first NPN type triode, the first PMOS and the second PMOS; Utilize the switch controlling signal that the base stage receiving system circuit of described first NPN type triode exports, grounded emitter, collector electrode connects the grid of the first PMOS, and connects the resettable fuse of primary path by the first pull-up resistor; The source electrode of described first PMOS is connected the resettable fuse of primary path, the grid of drain electrode connection second PMOS, and by pull down resistor ground connection; The source electrode of described second PMOS connects the resettable fuse of primary path, and drain electrode connects power output end.
As a kind of preferred circuit design of described resettable fuse stand-by channel, in described stand-by channel, be connected to by resettable fuse between input power and switching circuit, described switching circuit comprises the second NPN type triode and the 3rd PMOS; Utilize the switch controlling signal that the base stage receiving system circuit of described second NPN type triode exports, grounded emitter, collector electrode connects the grid of the 3rd PMOS, and connects the resettable fuse of stand-by channel by the second pull-up resistor; The source electrode of described 3rd PMOS connects the resettable fuse of stand-by channel, and drain electrode connects power output end.
In order to when described primary path and stand-by channel switch, strengthen the stability of out-put supply, the utility model is also connected with an electric capacity of voltage regulation on described power output end, and by described electric capacity of voltage regulation ground connection, with the waveform of regulated output voltage.
Preferably, described voltage detecting circuit preferably arranges two-way, and correspondence is connected to the two ends of the resettable fuse of described primary path, detects the voltage at resettable fuse two ends in primary path respectively, and transfer to described circuit system, to obtain the voltage difference at described fuse two ends.
As a kind of preferred circuit design of described voltage detecting circuit, in the voltage detecting circuit described in each road, be provided with a NPN type triode, a PMOS and a bleeder circuit; NPN type triode in described voltage detecting circuit, the enable signal that its base stage receiving system circuit exports, grounded emitter, collector electrode connects the grid of the PMOS in voltage detecting circuit, and connects the resettable fuse of primary path by resistance; The source electrode of the PMOS in described voltage detecting circuit connects the resettable fuse of described primary path, drains by described bleeder circuit ground connection, the divider node connected system circuit of described bleeder circuit, exports sampled voltage to circuit system.
In order to realize over-voltage protecting function, in described power circuit, being also provided with overvoltage crowbar, connecting the intermediate node of resettable fuse and switching circuit in described primary path and stand-by channel respectively, the supply power voltage transferring to circuit system is clamped down on.
Preferably, can also arrange power management chip in described power circuit, described input power transfers to power management chip by resettable fuse primary path or resettable fuse stand-by channel, exports circuit system to by power management chip.
Based on above-mentioned power circuit, the utility model also proposed a kind of electronic product, is provided with power circuit and circuit system, and described power circuit receives input power and powers for described circuit system; Resettable fuse primary path, resettable fuse stand-by channel and voltage detecting circuit is provided with in described power circuit, described resettable fuse primary path and resettable fuse stand-by channel are in parallel, and are connected in the supply line carrying described input power; Described voltage detecting circuit detects the voltage difference at the resettable fuse two ends in resettable fuse primary path, and transferring to described circuit system, one of them being controlled described resettable fuse primary path and resettable fuse stand-by channel by circuit system is communicated with.
Compared with prior art, advantage of the present utility model and good effect are: power circuit of the present utility model, by design resettable fuse primary path and resettable fuse stand-by channel, can make the life cycle of the electronic product applying resettable fuse extend.When self resistance of the resettable fuse in primary path is excessive; stand-by channel can be switched to continue as circuit system and power; and carry out overcurrent protection; thus avoid that the rush of current born because of resettable fuse is excessive, overlong time and pressure drop above the fuse caused is excessive; then the system cloud gray model instability caused or inoperable phenomenon occur, significantly improve the overall performance of electronic product.
After reading the detailed description of the utility model execution mode by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the power circuit based on resettable fuse that the utility model proposes;
Fig. 2 is the circuit theory diagrams of a specific embodiment of power circuit shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The present embodiment is for the electronic product adopting resettable fuse to design as overflow protecting element, propose a kind of line design of power circuit, adopt a resettable fuse as overflow protecting element to solve conventional power source circuit, the supply power voltage causing transferring to circuit system after described resettable fuse is subject to repeatedly overcurrent impact because of the increase of self resistance too reduces, then the problem that circuit system normally runs is had influence on, propose a kind of Redundancy Design scheme of fuse path, namely two fuse paths are set simultaneously in the supply line of conveying input power---resettable fuse primary path and resettable fuse stand-by channel, by described resettable fuse primary path and resettable fuse stand-by channel are in parallel, and the input power transmission channel that resettable fuse primary path is acquiescence is set.In use, gather the voltage difference at resettable fuse two ends in described primary path, and described voltage difference and predetermined setting threshold V are compared; If described voltage difference is less than or equal to setting threshold V, then think the resettable fuse in primary path resistance also within the acceptable range, can not impact the normal operation of circuit system, therefore keep the connected state of primary path, continue through the described input power described in the conveying of resettable fuse primary path.If detect, described voltage difference is greater than setting threshold V, then think that the resistance of the resettable fuse in primary path is excessive, the minimum input voltage that the pressure drop produced thereon can cause the supply power voltage being input to circuit system to be less than circuit system steady operation allowing, then now, in order to ensure that circuit system can normally work, primary path is cut off, be communicated with stand-by channel, namely the input power described in the conveying of described resettable fuse stand-by channel is switched to, to ensure that circuit system can normal electricity consumption, just extend the service time of electronic product thus.
As shown in Figure 1, an a resettable fuse F1/F2 and one switching circuit A/B is respectively arranged with in the resettable fuse primary path and resettable fuse stand-by channel of the present embodiment, resettable fuse F1 in primary path is connected between input power DC_INPUT and switching circuit A, the switch controlling signal PTC1_EN that switching circuit A receiving system circuit exports, by control switch circuit A break-make, be communicated with or cut off resettable fuse primary path.In like manner, resettable fuse F2 in stand-by channel is connected between input power DC_INPUT and switching circuit B, the switch controlling signal PTC2_EN that switching circuit B receiving system circuit exports, by control switch circuit B break-make, is communicated with or cuts off resettable fuse stand-by channel.
Automatically switch to realize between resettable fuse primary path and stand-by channel, the present embodiment arranges voltage detecting circuit, for detecting the voltage difference at resettable fuse F1 two ends in primary path.As a kind of preferred circuit design of the present embodiment, a voltage detecting circuit C/D can be connected respectively at the two ends of fuse F1, as shown in Figure 1, detect the magnitude of voltage at fuse F1 two ends respectively, difference operation is asked to two magnitudes of voltage detected, the voltage difference at fuse F1 two ends can be obtained.
Certainly, also only can design a voltage detecting circuit, be connected to the two ends of fuse F1, directly gather the step-down at fuse F1 two ends, can testing requirement be met equally.
The present embodiment is described to arrange two voltage detecting circuits C, D while shown in Fig. 1.Two voltage detecting circuits C, D are connected to the two ends of resettable fuse F1, gather the voltage swing at resettable fuse F1 two ends respectively, and sampled voltage is transferred to circuit system respectively, specifically can transfer to the analog-to-digital conversion interface of circuit system, analog sampling voltage transitions is become digital signal, and be converted into the digital voltage corresponding with the both end voltage of resettable fuse F1, then difference operation is asked to two digital voltages, the voltage difference V at resettable fuse F1 two ends can be calculated
f1.
Circuit system is according to the voltage difference V calculated
f1, judge that whether the pressure drop at resettable fuse F1 two ends in primary path is excessive, specifically can adopt the voltage difference V that will calculate
f1the mode compared with setting threshold V judges.Specifically, first according to the magnitude of voltage V of input power DC_INPUT
dC_INPUTwith the minimum input voltage value V that circuit system steady operation allows
lOWdetermine setting threshold V=V
dC-INPUT-V
lOW; Then, the voltage difference V will calculated
f1compare with setting threshold V, if V
f1>V; then judge that the pressure drop at resettable fuse F1 two ends is excessive; circuit system changes the level state of switch controlling signal PTC1_EN and PTC2_EN; control switch circuit A turns off, switching circuit B conducting; then the transmission channel of input power DC_INPUT is switched to resettable fuse stand-by channel from resettable fuse primary path, utilize the resettable fuse F2 in stand-by channel to carry out overcurrent protection to electronic product.
In order to prevent causing the infringement such as overcurrent, overvoltage by measure loop to circuit system, the present embodiment design only detects the voltage difference at resettable fuse F1 two ends in primary path when electronic product start runs, this controls the work schedule of voltage detecting circuit C, D effectively with regard to needing.For this reason, the present embodiment design system circuit, when startup optimization, exports effective enable signal ADC_EN, transfers to the control end of voltage detecting circuit C, D respectively, control voltage testing circuit C, D gather the voltage at resettable fuse F1 two ends, and sampled voltage is fed back to circuit system.Circuit system is after receiving effective sampled voltage, and putting enable signal ADC_EN is disarmed state, and control voltage testing circuit C, D is out of service or directly keep apart from primary path, to avoid impacting the normal operation of circuit system.
Fig. 2 is the present embodiment is a kind of physical circuit assembling structure realizing the power circuit that above-mentioned purpose of design proposes.Wherein, switching circuit A can adopt a NPN type triode Q9 and two PMOS Q3, a Q8 and coordinate simple peripheral circuit to build, and resettable fuse F1 is connected between input power DC_INPUT and described switching circuit A.By NPN type triode Q9(first NPN type triode) base stage receiving system circuit export switch controlling signal PTC1_EN, by the grounded emitter of triode Q9, collector electrode connects PMOS Q8(first PMOS) grid, and connect resettable fuse F1 by the first pull-up resistor R10.The source electrode of PMOS Q8 is connected to resettable fuse F1, and drain electrode connects PMOS Q3(second PMOS) grid, and by pull down resistor R4 ground connection.The source electrode of described PMOS Q3 connects resettable fuse F1, and drain electrode connects power output end VCC.
In switching circuit A, the resistance of pull down resistor R4 and pull-up resistor R10 should be tried one's best greatly, to guarantee that the loss on the loop of PMOS Q8 and pull down resistor R4 is as far as possible little after PMOS Q3 shutoff, PMOS Q8 conducting, as far as possible little to the loss on ground through NPN type triode Q9.
Switching circuit B can adopt a NPN type triode Q6 and PMOS Q7 to coordinate simple peripheral circuit to build, and is connected between input power DC_INPUT and described switching circuit B by resettable fuse F2.By NPN type triode Q6(second NPN type triode) base stage receiving system circuit export switch controlling signal PTC2_EN, by the grounded emitter of triode Q6, collector electrode connects PMOS Q7(the 3rd PMOS) grid, and connect resettable fuse F2 by the second pull-up resistor R8.The source electrode of PMOS Q7 is connected to resettable fuse F2, and drain electrode connects power output end VCC.
Certainly, other element devices with on-off action also can be adopted to design for described switching circuit A, B, such as controllable silicon, NMOS tube, PNP type triode etc., the present embodiment is not limited in above citing.
For voltage detecting circuit C, D, a NPN type triode, a PMOS and a bleeder circuit can be adopted and coordinate simple peripheral circuit to be formed by connecting.As shown in Figure 2, NPN type triode Q4, PMOS Q5, divider resistance R1, R2 and pull-up resistor R3 is utilized to build voltage detecting circuit C.Wherein, by the enable signal ADC_EN that the base stage receiving system circuit of NPN type triode Q4 exports, grounded emitter, collector electrode connects the grid of PMOS Q5, and connects one end F1-1 of resettable fuse F1 connection input power DC_INPUT by pull-up resistor R3.The source electrode of described PMOS Q5 is also connected to the F1-1 end of resettable fuse F1, the drain electrode of PMOS Q5 connects bleeder circuit, namely by divider resistance R1, R2 ground connection of series connection, the sampled voltage ADC-1 of one end of resettable fuse F1 connection input power DC_INPUT is exported by the divider node of divider resistance R1, R2.
In like manner, NPN type triode Q1, PMOS Q2, divider resistance R5, R7 and pull-up resistor R6 form voltage detecting circuit D.Wherein, the enable signal ADC_EN exported by the base stage receiving system circuit of NPN type triode Q1, grounded emitter, collector electrode connects the grid of PMOS Q2, and connects one end F1-2 of resettable fuse F1 connecting valve circuit A by pull-up resistor R6.The source electrode of described PMOS Q2 is also connected to the F1-2 end of resettable fuse F1, the drain electrode of PMOS Q2 connects bleeder circuit, namely by divider resistance R5, R7 ground connection of series connection, the sampled voltage ADC-2 of one end of resettable fuse F1 connecting valve circuit A is exported by the divider node of divider resistance R5, R7.
Sampled voltage ADC-1 and ADC-2 described in being received by circuit system, to calculate the pressure drop produced on resettable fuse F1, namely above-mentioned voltage difference V
f1.
The resistance of described divider resistance R1, R2, R5, R7 can according to the analog-to-digital conversion interface of circuit system allow the voltage range inputted specifically to determine, namely, sampled voltage ADC-1 and ADC-2 exported by divider node should analog-to-digital conversion interface allow input voltage range within, to avoid causing damage to the analog-to-digital conversion interface of circuit system.
Below in conjunction with Fig. 1, Fig. 2, the specific works process of the power circuit of the present embodiment is set forth in detail.
When electronic product is started shooting, system default switch controlling signal PTC1_EN and PTC2_EN is low level, and now, switching circuit A conducting, switching circuit B turns off, and resettable fuse primary path is communicated with, and conveying input power DC_INPUT is that circuit system is powered.Specific to Fig. 2, namely when PTC1_EN is low level, triode Q9 and PMOS Q8 cut-off, PMOS Q3 because of its source voltage higher than its grid voltage saturation conduction, be communicated with the current circuit of resettable fuse F1, input power DC_INPUT is powered to circuit system by resettable fuse primary path, and circuit system is powered on operation.Circuit system, after startup optimization, first exports effective enable signal ADC_EN, such as high level signal, and control voltage testing circuit C, D voltage to resettable fuse F1 two ends detects.Specific to Fig. 2, when enable signal ADC_EN is high level, triode Q1, Q4 saturation conduction, drag down the grid potential of PMOS Q2, Q5, be similar to and be shorted to ground, then make PMOS Q2, Q5 saturation conduction, connect the current circuit of bleeder circuit and resettable fuse F1.Now, the voltage of the FI-1 end of resettable fuse F1, via after divider resistance R1, R2 dividing potential drop, forms sampled voltage ADC-1, transfers to circuit system; The voltage of the FI-2 end of resettable fuse F1, via after divider resistance R5, R7 dividing potential drop, forms sampled voltage ADC-2, also transfers to circuit system.Circuit system is after receiving described sampled voltage ADC-1 and ADC-2, putting enable signal ADC_EN is disarmed state, such as be set to low level, control triode Q1, Q4 cut-off, PMOS Q2, Q5 turn off, and isolated by bleeder circuit, no longer detect the voltage at resettable fuse F1 two ends from resettable fuse primary path, in case locking system circuit is in follow-up running, measure loop causes the infringement such as overcurrent or overvoltage to circuit system.
The present embodiment design system circuit only carries out one-time detection when starting shooting to the pressure drop on resettable fuse F1, sampled voltage ADC-1 and ADC-2 received is converted into actual voltage value corresponding with it, then ask its difference, namely obtain the voltage difference V at resettable fuse F1 two ends
f1.
The voltage difference V that circuit system will calculate
f1compare with setting threshold V, if V
f1≤ V, then the supply power voltage being input to circuit system is greater than the minimum input voltage V that circuit system steady operation allows
lOW, continue through resettable fuse primary path transmission input power DC_INPUT.If V
f1>V, then think that the pressure drop on resettable fuse F1 is excessive, can cause the minimum input voltage V that the supply power voltage being input to circuit system allows lower than circuit system steady operation
lOWnow, in order to ensure that circuit system can normally run, it is high level that circuit system puts switch controlling signal PTC1_EN and PTC2_EN, then control switch circuit A shutoff, switching circuit B conducting, switch to resettable fuse stand-by channel to transmit described input power DC_INPUT.Specific to Fig. 2; namely; when switch controlling signal PTC1_EN and PTC2_EN is high level; triode Q9, Q6 saturation conduction; drag down the grid potential of PMOS Q8, Q7; make PMOS Q8, Q7 saturation conduction, be communicated with the current circuit of resettable fuse F2 in stand-by channel, switch to resettable fuse F2 for circuit system and overcurrent protection is provided.Now, PMOS Q3 in primary path makes its grid voltage close to its source voltage due to the saturation conduction of PMOS Q8, then PMOS Q3 cut-off is controlled, cut off resettable fuse primary path, change and transmit input power DC_INPUT by resettable fuse stand-by channel, so just extend the service time of electronic product.
In order to when two paths switch, the stability of the supply power voltage exported by primary path or stand-by channel can be strengthened, the present embodiment preferably sets up an electric capacity of voltage regulation C1 at power output end VCC place, as shown in Figure 2, be connected between power output end VCC and ground, with the waveform of the supply power voltage of stable output.In the present embodiment, the capacitance of described electric capacity of voltage regulation C1 should design as far as possible large according to actual needs.
In the present embodiment, two fuses that described resettable fuse F1 with F2 preferably adopts parameter identical, to strengthen the stability that path switches further.
In order to realize over-voltage protecting function; the present embodiment is also provided with overvoltage crowbar in described electronic product; as shown in Figure 1, connect the intermediate node of resettable fuse and switching circuit in primary path and stand-by channel respectively, the supply power voltage transferring to circuit system is clamped down on.
Design as a kind of preferred circuit, the overvoltage crowbar described in a voltage-stabiliser tube D1 design can be adopted.As shown in Figure 2, the negative electrode of voltage-stabiliser tube D1 is connected to respectively the intermediate node of resettable fuse F1 and switching circuit A, and the intermediate node of resettable fuse F2 and switching circuit B, by the plus earth of voltage-stabiliser tube D1, the reverse breakdown pressure drop of configuration voltage-stabiliser tube D1, reverse breakdown when making its overtension at input power DC_INPUT, to limit the supply power voltage being input to circuit system, avoids causing overvoltage to damage to circuit system.
Power management chip can also be set further in the power circuit of the present embodiment, as shown in Figure 1, the supply power voltage exported by primary path or stand-by channel is transferred to power management chip, follow-up circuit system is resent to by power management chip, management further can be realized to the power supply being input to circuit system thus, guarantee the Electrical Safety of circuit system further.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also should belong to protection range of the present utility model.
Claims (10)
1., based on a power circuit for resettable fuse, described power circuit receives input power also for circuit system is powered; It is characterized in that: in described power circuit, be provided with resettable fuse primary path, resettable fuse stand-by channel and voltage detecting circuit, described resettable fuse primary path and resettable fuse stand-by channel are in parallel, and are connected in the supply line carrying described input power; Described voltage detecting circuit detects the voltage difference at the resettable fuse two ends in resettable fuse primary path, and transferring to described circuit system, one of them being controlled described resettable fuse primary path and resettable fuse stand-by channel by circuit system is communicated with.
2. the power circuit based on resettable fuse according to claim 1, it is characterized in that: in described resettable fuse primary path and resettable fuse stand-by channel, be provided with resettable fuse and switching circuit, described circuit system generates switch controlling signal according to the described voltage difference collected, export the switching circuit described in two to, by controlling the switching circuit break-make described in two, one of them controlling described resettable fuse primary path and resettable fuse stand-by channel is communicated with.
3. the power circuit based on resettable fuse according to claim 2, it is characterized in that: in described primary path, resettable fuse is connected between input power and switching circuit, described switching circuit comprises the first NPN type triode, the first PMOS and the second PMOS, the switch controlling signal of the base stage receiving system circuit output of described first NPN type triode, grounded emitter, collector electrode connects the grid of the first PMOS, and connects the resettable fuse of primary path by the first pull-up resistor; The source electrode of described first PMOS connects the resettable fuse of primary path, the grid of drain electrode connection second PMOS, and by pull down resistor ground connection; The source electrode of described second PMOS connects the resettable fuse of primary path, and drain electrode connects power output end.
4. the power circuit based on resettable fuse according to claim 2, it is characterized in that: in described stand-by channel, resettable fuse is connected between input power and switching circuit, described switching circuit comprises the second NPN type triode and the 3rd PMOS, the switch controlling signal of the base stage receiving system circuit output of described second NPN type triode, grounded emitter, collector electrode connects the grid of the 3rd PMOS, and connects the resettable fuse of stand-by channel by the second pull-up resistor; The source electrode of described 3rd PMOS connects the resettable fuse of stand-by channel, and drain electrode connects power output end.
5. the power circuit based on resettable fuse according to claim 4, is characterized in that: described power output end is by electric capacity of voltage regulation ground connection.
6. the power circuit based on resettable fuse according to any one of claim 1 to 5, it is characterized in that: described voltage detecting circuit is provided with two-way, correspondence is connected to the two ends of the resettable fuse of described primary path, detect the voltage at the resettable fuse two ends in described primary path respectively, and transfer to described circuit system.
7. the power circuit based on resettable fuse according to claim 6, it is characterized in that: in the voltage detecting circuit described in each road, be provided with a NPN type triode, a PMOS and a bleeder circuit, NPN type triode in described voltage detecting circuit, the enable signal that its base stage receiving system circuit exports, grounded emitter, collector electrode connects the grid of the PMOS in voltage detecting circuit, and connects the resettable fuse of primary path by resistance; The source electrode of the PMOS in described voltage detecting circuit connects the resettable fuse of described primary path, drains by described bleeder circuit ground connection, the divider node connected system circuit of described bleeder circuit, exports sampled voltage to circuit system.
8. the power circuit based on resettable fuse according to any one of claim 2 to 5; it is characterized in that: in described power circuit, be also provided with overvoltage crowbar; connect the intermediate node of resettable fuse and switching circuit in described primary path and stand-by channel respectively, the supply power voltage transferring to circuit system is clamped down on.
9. the power circuit based on resettable fuse according to any one of claim 1 to 5, it is characterized in that: in described power circuit, be also provided with power management chip, described input power transfers to power management chip by resettable fuse primary path or resettable fuse stand-by channel, exports circuit system to by power management chip.
10. an electronic product, is provided with power circuit and circuit system, it is characterized in that: described power circuit is as claimed in any one of claims 1-9 wherein based on the power circuit of resettable fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286497.8U CN204597446U (en) | 2015-05-06 | 2015-05-06 | Based on power circuit and the electronic product of resettable fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286497.8U CN204597446U (en) | 2015-05-06 | 2015-05-06 | Based on power circuit and the electronic product of resettable fuse |
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| Publication Number | Publication Date |
|---|---|
| CN204597446U true CN204597446U (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520286497.8U Active CN204597446U (en) | 2015-05-06 | 2015-05-06 | Based on power circuit and the electronic product of resettable fuse |
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| CN (1) | CN204597446U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212376A (en) * | 2018-10-19 | 2019-01-15 | 优利德科技(中国)股份有限公司 | A kind of detecting system of self-recovery fuse, method for detecting and measuring instrumentss |
-
2015
- 2015-05-06 CN CN201520286497.8U patent/CN204597446U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212376A (en) * | 2018-10-19 | 2019-01-15 | 优利德科技(中国)股份有限公司 | A kind of detecting system of self-recovery fuse, method for detecting and measuring instrumentss |
| CN109212376B (en) * | 2018-10-19 | 2024-03-12 | 优利德科技(中国)股份有限公司 | Detection system, detection method and measuring instrument for self-recovery fuse |
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