CN203691719U - Protective circuit of current source ripple inhibition circuit - Google Patents
Protective circuit of current source ripple inhibition circuit Download PDFInfo
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- CN203691719U CN203691719U CN201420033572.5U CN201420033572U CN203691719U CN 203691719 U CN203691719 U CN 203691719U CN 201420033572 U CN201420033572 U CN 201420033572U CN 203691719 U CN203691719 U CN 203691719U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 24
- 230000005764 inhibitory process Effects 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000001629 suppression Effects 0.000 claims description 56
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000013021 overheating Methods 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 230000003685 thermal hair damage Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- Y02B20/42—
Abstract
The utility model provides a protective circuit of a current source ripple inhibition circuit. The protective circuit comprises an adjustable impedance pipe, a ripple inhibition and control circuit, a temperature detection circuit and a comparison circuit, wherein the comparison circuit is used for comparing the magnitude of a first electric signal Vs, which represents the temperature of the adjustable impedance pipe and is output by the temperature detection circuit, with that of a reference electric signal Vr, which represents a preset protection temperature; and when the temperature of the adjustable impedance pipe is no less than the preset protection temperature, an output end of the comparison circuit controls the adjustable impedance pipe to be conducted in a saturated mode, so that the temperature of the adjustable impedance pipe is reduced, the adjustable impedance pipe is prevented from being damaged by overheating and further causing a broken load loop of the output end of an LED driver, and reliability of the LED driver is not lowered due to the addition of the ripple inhibition circuit.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of protective circuit of current source ripple suppression circuit.
Background technology
Current source can provide the direct current at certain amplitude stability to load, therefore, having wide range of applications of current source, but, because causing the direct current of current source output, the circuit of current source inside there is ripple, the direct current that is current source output is not an invariable current value, but fluctuation within the specific limits.
Wherein, LED driver is exactly a typical current source, can provide the direct current of stablizing amplitude for LED lamp.But some LED drivers, because the speed of its electric current loop is slower, or the capacity of its output capacitor is hour, and LED driver output current amplitude can fluctuate within the specific limits, and this output current has ripple.In order to reduce ripple, conventionally at the output of the constant-current source 10 of LED driver, the ripple suppression circuit of connecting with load, comprise impedance adjustable tube S and control circuit 20, as shown in Figure 1, by regulating the impedance magnitude of this impedance adjustable tube S, the ripple size of restriction LED driver output current.
But; in the time that LED driver end of lifetime or other reasons cause driver output electrolysis capacitance significantly to reduce; make the current ripples of its output excessive, this impedance adjustable tube is in order to suppress ripple, and its impedance meeting is adjusted to very large; impedance adjustable tube both end voltage is born very large voltage; cause impedance adjustable tube temperature upper body overheated and damage, or be provided with thermal-shutdown circuit, once detect that impedance adjustable tube is overheated; control group adjustable tube disconnects, and avoids impedance adjustable tube to damage.Cause loop open circuit if impedance adjustable tube is overheated; no matter be that cause thermal damage disconnects or control group adjustable tube disconnects under thermal-shutdown circuit effect because cross; the ripple suppression circuit of series connection does not only play inhibitory action; but also affected the normal work of LED driver, make the LED lamp of rear class can not be normally luminous.
Utility model content
In view of this; the utility model provides a kind of protective circuit of current source ripple suppression circuit; effectively solve the impedance adjustable tube reducing in prior art in current source ripple circuit in inhibition ripple process; the impedance adjustable tube that causes because current source ripple is excessive is overheated causes LED driver output to be opened circuit, and reduces the problem of LED driver reliability.
For achieving the above object, the utility model provides following technical scheme:
A protective circuit for current source ripple suppression circuit, described current source output connects load, comprises impedance adjustable tube, Ripple Suppression control circuit, temperature sensing circuit and comparison circuit;
Described load and impedance adjustable tube are in series, and branch road after series connection is connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube, for the impedance magnitude of control group adjustable tube, suppresses the output current ripple of described current source;
Described temperature sensing circuit, for detection of the temperature of impedance adjustable tube, is exported first signal of telecommunication with impedance adjustable tube temperature correlation connection;
The first input end of described comparison circuit connects the output of described temperature sensing circuit; receive described first signal of telecommunication; the second input connects the reference electrical signal corresponding with default protection temperature; in the time that described impedance adjustable tube temperature is not less than described default protection temperature, the output control group adjustable tube saturation conduction of described comparison circuit.
Preferably, the priority of described comparison circuit is higher than described Ripple Suppression control circuit.
Preferably, described first signal of telecommunication increases along with the increase of described impedance adjustable tube temperature, or described first signal of telecommunication reduces along with the increase of described impedance adjustable tube temperature.
Preferably, described comparison circuit comprises operational amplifier, and the normal phase input end of described operational amplifier connects the output of described temperature sensing circuit, and its inverting input connects described reference electrical signal, and its output connects the control end of described impedance adjustable tube.
Preferably, described comparison circuit comprises operational amplifier, and the inverting input of described operational amplifier connects the output of described temperature sensing circuit, and its normal phase input end connects described reference electrical signal, and its output connects the control end of described impedance adjustable tube.
Preferably, described comparison circuit comprises operational amplifier, and the normal phase input end of described operational amplifier connects the output of described temperature sensing circuit, and its inverting input connects described reference electrical signal; Its output connects the control end of described impedance adjustable tube by described Ripple Suppression control circuit.
Preferably, described comparison circuit comprises operational amplifier, and the inverting input of described operational amplifier connects the output of described temperature sensing circuit, and its normal phase input end connects described reference electrical signal; Its output connects the control end of described impedance adjustable tube by described Ripple Suppression control circuit.
Preferably, described first signal of telecommunication is voltage signal or current signal.
Preferably, described impedance adjustable tube is P type switching tube or N-type switching tube.
Preferably, the adjustable light pipe of described impedance is any one in metal-oxide-semiconductor, triode and IGBT.
Known via above-mentioned technical scheme, compared with prior art, the utility model provides a kind of protective circuit of current source ripple suppression circuit, comprise impedance adjustable tube, Ripple Suppression control circuit, temperature sensing circuit and comparison circuit, wherein, comparison circuit characterizes the first signal of telecommunication Vs of described impedance adjustable tube S temperature for more described temperature sensing circuit output and characterizes the reference electrical signal Vr of default protection temperature, in the time that described impedance adjustable tube temperature is not less than described default protection temperature, the output control group adjustable tube saturation conduction of described comparison circuit, thereby reduce the temperature of described impedance adjustable tube S, prevent that it from crossing cause thermal damage and causing the load circuit of LED driver output to open circuit, avoid LED driver can not reduce because having added ripple suppression circuit its reliability.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the circuit diagram of reduction current source ripple circuit of the prior art;
The circuit diagram of the protective circuit of the first current source ripple suppression circuit that Fig. 2 provides for the utility model;
The circuit diagram of the protective circuit of the second current source ripple suppression circuit that Fig. 3 provides for the utility model;
The circuit diagram of the protective circuit of the third current source ripple suppression circuit that Fig. 4 provides for the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment mono-
The utility model embodiment provides the protective circuit of the first current source ripple suppression circuit, and described current source output connects load, comprises impedance adjustable tube S, Ripple Suppression control circuit 303, temperature sensing circuit 301 and comparison circuit 302.With reference to Fig. 2, in this circuit, load and impedance adjustable tube S are in series, and the road of series connection is connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube S, for the impedance magnitude of control group adjustable tube S, suppresses the output current ripple of described current source;
Described temperature sensing circuit is for detection of the temperature of impedance adjustable tube, and output characterizes the first signal of telecommunication Vs of described impedance adjustable tube temperature;
The first input end of described comparison circuit connects the output of described temperature sensing circuit; receive described the first signal of telecommunication Vs; the second input of described comparison circuit connects the reference electrical signal Vr that characterizes default protection temperature; in the time that described impedance adjustable tube temperature is not less than described default protection temperature, the output control group adjustable tube saturation conduction of described comparison circuit.In foregoing circuit, current source can be LED driver, and load can be LED lamp, and the output current of described current source has ripple.
In the time that load is LED lamp, the anode of load, is also the positive output end of the anodic bonding LED driver of LED lamp; The negative terminal of load, is also the hot end of the negative electrode connection impedance adjustable tube S of LED lamp, and the cold end of impedance adjustable tube S connects the negative output terminal of LED driver.
Described the first signal of telecommunication Vs joining with impedance adjustable tube temperature correlation specifically refers to that the electrical characteristics of described the first signal of telecommunication Vs change along with the variation of impedance adjustable tube temperature, be the temperature that described temperature sensing circuit detects described impedance tunable optical S, and export the electrical characteristics that this temperature characterisitic is converted to the first signal of telecommunication Vs to described comparison circuit.
Preferably, described comparison circuit is the comparison circuit of priority higher than described Ripple Suppression control circuit.The signal of telecommunication that described first signal of telecommunication increases along with the increase of described impedance adjustable tube temperature, or described first signal of telecommunication is the signal of telecommunication reducing along with the increase of described impedance adjustable tube temperature.
It should be noted that, the electrical characteristics that described the first signal of telecommunication Vs changes along with the variation of impedance adjustable tube S temperature specifically can refer to amplitude variation etc. along with the variation of impedance adjustable tube S temperature of voltage signal or current signal.
Concrete, the default protection temperature before described reference electrical signal Vr damages corresponding to described impedance adjustable tube S excess temperature.
Described comparison circuit, by more described the first signal of telecommunication Vs and described reference electrical signal Vr, judges whether the temperature of described impedance adjustable tube S reaches described default protection temperature.When the temperature that is judged as described impedance adjustable tube S when described comparison circuit reaches described default protection temperature, the saturation conduction of controlling described impedance adjustable tube S reduces its temperature; When the temperature that is judged as described impedance adjustable tube S when described comparison circuit does not reach described default protection temperature, the impedance of described impedance adjustable tube S is subject to the control of described Ripple Suppression control circuit, reaches the effect that suppresses current source ripple.
It should be noted that, from the description of foregoing circuit, can find out, described comparison circuit and described Ripple Suppression control circuit are all controlled impedance adjustable tube S, if when described comparison circuit and described Ripple Suppression control circuit are competed to the control of impedance adjustable tube S, the priority of described comparison circuit is higher than Ripple Suppression control circuit, i.e. impedance adjustable tube S is subject to described comparison circuit control.
It should be noted that, described comparison circuit and described Ripple Suppression control circuit are competed to the control of impedance adjustable tube S, specifically refer to described comparison circuit wish control group adjustable tube S saturation conduction, simultaneously, described Ripple Suppression control circuit is wanted control group adjustable tube S in linear zone, and impedance adjustable tube S is subject to described comparison circuit control to work in saturation conduction.
Wherein, impedance adjustable tube S can be metal-oxide-semiconductor, triode and IGBT etc.
The first input end of comparison circuit of the present utility model connects the first signal of telecommunication Vs of described temperature sensing circuit output, the second input connects described reference electrical signal Vr, judge that by the size that compares both both distinguish the real time temperature of corresponding described impedance adjustable tube S and the size of default protection temperature, reach default protection temperature once the real time temperature that is judged as described impedance adjustable tube S, control described impedance adjustable tube S saturation conduction, reduce the pressure drop at impedance adjustable tube S two ends, thereby reduce the temperature of described impedance adjustable tube S, prevent that it from crossing cause thermal damage and causing the load circuit of LED driver output to open circuit, avoid LED driver can not reduce because having added ripple suppression circuit its reliability, and just in the time that LED driver end of lifetime output electrolysis appearance significantly reduces, cause ripple to can not get suppressing.
Embodiment bis-
Refer to Fig. 3; for the circuit diagram of the protective circuit of the disclosed the second current source of the utility model embodiment ripple suppression circuit; identical with embodiment mono-of the annexation of constant-current source 10, load, impedance adjustable tube S and Ripple Suppression control circuit 303 in this circuit; please refer to the description in embodiment mono-, this is no longer going to repeat them.Comparison circuit in the present embodiment is the embodiment of embodiment mono-.
Described comparison circuit, comprises operational amplifier A 1, and the inverting input of operational amplifier A 1 connects reference electrical signal Vr, and its normal phase input end connects the output of temperature sensing circuit; Its output connects the control end of impedance adjustable tube S.
It should be noted that, in the present embodiment, first signal of telecommunication Vs with described impedance adjustable tube temperature correlation connection of temperature sensing circuit output is voltage signal, and corresponding, described reference electrical signal is the voltage signal corresponding to default protection temperature of impedance adjustable tube.
The amplitude of described first signal of telecommunication can increase along with the rising of impedance adjustable tube temperature, also can reduce along with the rising of impedance adjustable tube temperature.
Described impedance adjustable tube S can be P type switching tube, can be also N-type switching tube.
In conjunction with Fig. 3, the operation principle of describing the present embodiment is:
If the amplitude of described first signal of telecommunication can increase along with the rising of impedance adjustable tube temperature, and impedance adjustable tube S is N-type switching tube;
In the time that described operational amplifier A 1 is judged as described the first signal of telecommunication Vs and is less than described reference electrical signal Vr, be that described impedance adjustable tube S temperature is less than default protection temperature, the output low level signal of described operational amplifier A 1 does not produce and controls the adjustable light pipe S of described impedance, described impedance adjustable tube S regulates impedance magnitude under the effect of Ripple Suppression control circuit, thereby suppresses the ripple size of output current source;
In the time that described operational amplifier A 1 is judged as described the first signal of telecommunication Vs and is more than or equal to described reference electrical signal Vr; be that described impedance adjustable tube S temperature reaches default protection temperature; the adjustable light pipe S of impedance saturation conduction described in the output high level signal control of described operational amplifier A 1, described impedance adjustable tube S temperature declines.
If the amplitude of described first signal of telecommunication can reduce along with the rising of impedance adjustable tube temperature, and impedance adjustable tube S is P type switching tube;
In the time that described operational amplifier A 1 is judged as described the first signal of telecommunication Vs and is greater than described reference electrical signal Vr, be that described impedance adjustable tube S temperature is less than default protection temperature, the output high level signal of described operational amplifier A 1 does not produce and controls the adjustable light pipe S of described impedance, described impedance adjustable tube S regulates impedance magnitude under the effect of Ripple Suppression control circuit, thereby suppresses the ripple size of output current source;
In the time that described operational amplifier A 1 is judged as described the first signal of telecommunication Vs and is less than or equal to described reference electrical signal Vr; be that described impedance adjustable tube S temperature reaches default protection temperature; the adjustable light pipe S of impedance saturation conduction described in the output low level signal controlling of described operational amplifier A 1, described impedance adjustable tube S temperature declines.
The present embodiment has just been enumerated a certain concrete implementing circuit of the present utility model, but does not get rid of other implementing circuits.Such as, the connected mode of above-mentioned operational amplifier A 1 can replace with following annexation: the normal phase input end of operational amplifier A 1 connects reference electrical signal Vr, and its inverting input connects the output of temperature sensing circuit; Its output connects the control end of impedance adjustable tube S.(amplitude of described first signal of telecommunication is along with the rising monotone variation of impedance adjustable tube temperature for incidence relation between described first signal of telecommunication of corresponding adjusting and impedance adjustable tube temperature simultaneously; can be that monotonic increase can be also monotone decreasing); and the cast of adjusting impedance adjustable tube S (can be P pipe or N pipe); only can reach equally in impedance adjustable tube S temperature rise during to default protection temperature the control effect of control group adjustable tube S saturation conduction.
Embodiment tri-
The application's comparison circuit, except amplifier A1 output as shown in Fig. 3 of embodiment bis-directly connects impedance adjustable tube S, can also pass through the impedance magnitude of other circuit control group adjustable tube, and for example the present embodiment three, with reference to Fig. 4.
The present embodiment is identical, different with operation principle and the annexation of constant-current source 10, load, impedance adjustable tube S and the Ripple Suppression control circuit 303 of embodiment bis-: the output of comparison circuit is connected to Ripple Suppression control circuit.Due to Ripple Suppression control circuit can control group adjustable tube impedance magnitude, the impedance that comprises control group adjustable tube is minimum value, it is control group adjustable tube saturation conduction, and the priority of described comparison circuit is higher than described Ripple Suppression control circuit, so comparison circuit output can output signal act on Ripple Suppression control circuit, and make Ripple Suppression control circuit output corresponding signal control group adjustable tube saturation conduction, make impedance adjustable tube S can in the time that inhibition ripple is overheated, not cause load circuit to open circuit.
To sum up, the utility model provides a kind of protective circuit of current source ripple suppression circuit, comprise impedance adjustable tube, Ripple Suppression control circuit, temperature sensing circuit and comparison circuit, wherein, comparison circuit characterizes the first signal of telecommunication Vs of described impedance adjustable tube S temperature for more described temperature sensing circuit output and characterizes the reference electrical signal Vr of default protection temperature, in the time that described impedance adjustable tube temperature is not less than described default protection temperature, the output control group adjustable tube saturation conduction of described comparison circuit, thereby reduce the temperature of described impedance adjustable tube S, prevent that it from crossing cause thermal damage and causing the load circuit of LED driver output to open circuit, avoid LED driver can not reduce because having added ripple suppression circuit its reliability.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a protective circuit for current source ripple suppression circuit, described current source output connects load, it is characterized in that, comprises impedance adjustable tube, Ripple Suppression control circuit, temperature sensing circuit and comparison circuit;
Described load and impedance adjustable tube are in series, and branch road after series connection is connected to the output of described current source;
Described Ripple Suppression control circuit output connects impedance adjustable tube, for the impedance magnitude of control group adjustable tube, suppresses the output current ripple of described current source;
Described temperature sensing circuit is for detection of the temperature of impedance adjustable tube, and output characterizes first signal of telecommunication of described impedance adjustable tube temperature;
The first input end of described comparison circuit connects the output of described temperature sensing circuit; receive described first signal of telecommunication; the second input of described comparison circuit connects the reference electrical signal that characterizes default protection temperature; in the time that described impedance adjustable tube temperature is not less than described default protection temperature, the output control group adjustable tube saturation conduction of described comparison circuit.
2. the protective circuit of current source ripple suppression circuit according to claim 1, is characterized in that, described comparison circuit is the comparison circuit of priority higher than described Ripple Suppression control circuit.
3. the protective circuit of current source ripple suppression circuit according to claim 2, is characterized in that, described first signal of telecommunication is the signal of telecommunication increasing along with the increase of described impedance adjustable tube temperature;
Or,
Described first signal of telecommunication is the signal of telecommunication reducing along with the increase of described impedance adjustable tube temperature.
4. the protective circuit of current source ripple suppression circuit according to claim 1; it is characterized in that; described comparison circuit comprises operational amplifier; the normal phase input end of described operational amplifier connects the output of described temperature sensing circuit; its inverting input connects described reference electrical signal, and its output connects the control end of described impedance adjustable tube.
5. the protective circuit of current source ripple suppression circuit according to claim 1; it is characterized in that; described comparison circuit comprises operational amplifier; the inverting input of described operational amplifier connects the output of described temperature sensing circuit; its normal phase input end connects described reference electrical signal, and its output connects the control end of described impedance adjustable tube.
6. the protective circuit of current source ripple suppression circuit according to claim 1, it is characterized in that, described comparison circuit comprises operational amplifier, and the normal phase input end of described operational amplifier connects the output of described temperature sensing circuit, and its inverting input connects described reference electrical signal; Its output connects the control end of described impedance adjustable tube by described Ripple Suppression control circuit.
7. the protective circuit of current source ripple suppression circuit according to claim 1, it is characterized in that, described comparison circuit comprises operational amplifier, and the inverting input of described operational amplifier connects the output of described temperature sensing circuit, and its normal phase input end connects described reference electrical signal; Its output connects the control end of described impedance adjustable tube by described Ripple Suppression control circuit.
8. according to the protective circuit of the current source ripple suppression circuit described in claim 1 to 7 any one, it is characterized in that, described first signal of telecommunication is voltage signal or current signal.
9. according to the protective circuit of the current source ripple suppression circuit described in any one in claim 1 to 7, it is characterized in that, described impedance adjustable tube is P type switching tube or N-type switching tube.
10. the protective circuit of current source ripple suppression circuit according to claim 9, is characterized in that, described impedance is adjustable, and light pipe is metal-oxide-semiconductor, triode or IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033572.5U CN203691719U (en) | 2014-01-20 | 2014-01-20 | Protective circuit of current source ripple inhibition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033572.5U CN203691719U (en) | 2014-01-20 | 2014-01-20 | Protective circuit of current source ripple inhibition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691719U true CN203691719U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420033572.5U Expired - Lifetime CN203691719U (en) | 2014-01-20 | 2014-01-20 | Protective circuit of current source ripple inhibition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203691719U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168684A (en) * | 2014-07-18 | 2014-11-26 | 许瑞清 | Integrated circuit capable eliminating current ripple |
-
2014
- 2014-01-20 CN CN201420033572.5U patent/CN203691719U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168684A (en) * | 2014-07-18 | 2014-11-26 | 许瑞清 | Integrated circuit capable eliminating current ripple |
| CN104168684B (en) * | 2014-07-18 | 2016-05-18 | 许瑞清 | Current ripples is eliminated integrated circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Protective circuit of current source ripple inhibition circuit Effective date of registration: 20180702 Granted publication date: 20140702 Pledgee: Bank of Hangzhou Limited by Share Ltd. science and Technology Branch Pledgor: INVENTRONICS (HANGZHOU), Inc. Registration number: 2018330000171 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220527 Granted publication date: 20140702 Pledgee: Bank of Hangzhou Limited by Share Ltd. science and Technology Branch Pledgor: INVENTRONICS (HANGZHOU), Inc. Registration number: 2018330000171 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
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| CX01 | Expiry of patent term |