CN204598427U - A kind of Unisolated switch power circuit - Google Patents
A kind of Unisolated switch power circuit Download PDFInfo
- Publication number
- CN204598427U CN204598427U CN201520331706.6U CN201520331706U CN204598427U CN 204598427 U CN204598427 U CN 204598427U CN 201520331706 U CN201520331706 U CN 201520331706U CN 204598427 U CN204598427 U CN 204598427U
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- inductance
- switching tube
- comparator
- time delay
- power circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of Unisolated switch power circuit, comprise clock module, rest-set flip-flop, comparator, time delay module, load LED, diode D, inductance and detection resistance, the S end of rest-set flip-flop is connected with clock module, R end is connected with comparator, Q end is connected with time delay module, above-mentioned load LED mono-termination input power, the other end is connected with inductance L; The other end of this inductance L is connected with detection resistance, is also provided with switching tube M between the two, switching tube M is connected with above-mentioned time delay module, comparator input terminal is connected to and detects between resistance and switching tube M, comparator is also connected with reference voltage V, the positive pole of diode D is connected between inductance and switching tube M, and its negative pole is connected on load LED.A kind of Unisolated switch power circuit obtained, when realizing constant current output, does not need high-pressure side to sample, and reduces and realizes difficulty, when load wide variation, can realize excellent constant current effect simultaneously.
Description
Technical field
The utility model relates to a kind of switching power circuit, particularly a kind of Unisolated switch power circuit.
Background technology
In Unisolated switch power circuit, inductance is a kind of typical energy-storage travelling wave tube.During switch conduction, to induction charging, when switch cuts out, inductive discharge, loop cycle like this, achieves the switch transition process of power supply.Unisolated switch application of power in constant-current drive circuit time, be usually operated at and close on conduction mode, this just needs to detect demagnetization time of inductance, so just when load variations, can realize constant current.When induction charging, usually by detecting the voltage on low-pressure end current-limiting resistance, the size of inductive current can be detected very easily.When switch cuts out, the electric discharge of inductance needs to detect too, during due to inductive discharge, switch cuts out, inductance is in high-pressure side and can not detects very easily, or needs high-tension circuit to detect, and high-voltage detecting circuit is more complicated also, and high-tension circuit cost on integrated circuit technology realizes is higher, can increase the cost of chip.
Another method is exactly indirect detection, detects after utilizing transformer principle to reduce voltage, and this can increase the cost of device on using.When Switching Power Supply is operated in continuous conduction mode, the demagnetization time of inductance can be detected, but during load variations, output loading can not realize constant current.
Utility model content
The purpose of this utility model be in order to solve above-mentioned the deficiencies in the prior art provide switching power circuit do not need detect inductive discharge time the demagnetization time, a kind of Unisolated switch power circuit of excellent constant current effect and good load regulation can be realized.
To achieve these goals, designed by the utility model
a kind of Unisolated switch power circuit, it is characterized in that: comprise clock module, rest-set flip-flop, comparator, time delay module, load LED, diode D, inductance L and detection resistance, the S end of rest-set flip-flop is connected with clock module, R end is connected with comparator, Q end is connected with time delay module, above-mentioned load LED mono-termination input power, the other end is connected with inductance L; The other end of this inductance L is connected with detection resistance, is also provided with switching tube M between the two, switching tube M is connected with above-mentioned time delay module, comparator input terminal is connected to and detects between resistance and switching tube M, described comparator is also connected with reference voltage Vref, the positive pole of diode D is connected between inductance L and switching tube M, and its negative pole is connected on load LED.
A kind of Unisolated switch power circuit that the utility model obtains, when switching tube M conducting, detect the electric current flowing through and detect resistance, namely flow through the electric current of switching tube M, this electric current namely flows through the electric current of inductance L and load LED, and record current reaches the switch conduction times T1 of set point simultaneously, then extends same T1 switching time closing switch again, inductance is discharged by diode D, and the discharge time of inductance remains constant T0.The output current of such LED is the electric current of set point, when realizing constant current output, not needing high-pressure side to sample, reducing and realize difficulty, when load wide variation, can realize excellent constant current effect simultaneously.
Accompanying drawing explanation
Fig. 1 is non-isolating switch power circuit diagram.
Fig. 2 is inductive current and the waveform schematic diagram detecting resistance voltage.
In figure: clock module 1, rest-set flip-flop 2, time delay module 3, comparator 4, load LED5, diode D 6, inductance L 7, detection resistance 8, switching tube M9, reference voltage Vref 10.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment:
As shown in Figure 1, the utility model provides
a kind of Unisolated switch power circuit, comprise for the clock module 1 of timing, rest-set flip-flop 2, comparator 4, time delay module 3, load LED5, diode D 6, inductance L 7 for comparative voltage height and detect resistance 8, detecting resistance 8 is to set as required, rest-set flip-flop 2 it have two inputs R, S and two output Q, non-Q, the S end of rest-set flip-flop 2 is connected with clock module 1, R hold be connected with comparator 4, Q holds and is connected with time delay module 3, above-mentioned load LED2 mono-termination input power Vin, the other end is connected with inductance L 7; The other end of this inductance L 7 is connected with detection resistance 8, is also provided with switching tube M9 between the two, switching tube M9 is connected with above-mentioned time delay module 3, comparator 4 input is connected to and detects between resistance 8 and switching tube M9, described comparator 2 is also connected with reference voltage Vref 10, the positive pole of diode D6 is connected between inductance L 7 and switching tube M9, and its negative pole is connected on the positive pole of load LED5.
For a kind of Unisolated switch power circuit of above-mentioned design, shown in composition graphs 2, its operation principle is when switching tube M9 conducting, detect the electric current flowing through and detect resistance Rcs, namely flow through the electric current of switching tube M9, this electric current namely flows through the electric current of inductance L 7 and load LED5, the electric current simultaneously recording inductance L reaches the switch conduction times T1 of set point Ip, Ip=Vp/Rcs, then same T1 switching time closing switch is again extended, inductance L is discharged by diode D, and the discharge time of inductance L 7 remains constant T0, and the output current of such LED is: Ip.
Its course of work is as follows: clock module 1 makes the output of rest-set flip-flop 2 uprise at the beginning, after time delay module 3, driving switch pipe M9 opens, time delay module 3 timing starts, input power Vin is by load LED5, inductance L 7, switching tube M9 and detection resistance Rcs is to ground, during switching tube M9 conducting, the electric current flow through produces voltage Vp on Rcs, compared by comparator and reference voltage Vref, when Vp is greater than Vref, comparator exports the high rest-set flip-flop that makes and exports step-down, time when now time delay module record Rcs reaches Vp is T1, the time closing switch pipe M of time delay module 3 time delay T1 again.After switching tube M closes, because the electric current of inductance L cannot suddenly change, the energy that inductance L 7 stores just is discharged by diode D, and discharge time is fixed as T0, and after upon discharging, T0 terminates, switching tube M9 opens again, repeats process above.The electric current now produced on load LED5 is exactly Ip, Ip=Vp/Rcs=Vref/Rcs, Vref is fixed value, and Rcs can set as required, so constant during electric current in load.Due to load current only with reference voltage Vref 10 with to detect resistance Rcs relevant, so can obtain good load regulation.
For utility model person of an ordinary skill in the technical field; under the prerequisite not departing from utility model design; its framework form can be flexible and changeable; just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that claims of being submitted to by utility model are determined.
Claims (1)
1. a Unisolated switch power circuit, it is characterized in that: comprise clock module (1), rest-set flip-flop (2), comparator (4), time delay module (3), load LED(5), diode D(6), inductance L (7) and detect resistance (8), the S end of rest-set flip-flop (2) is connected with clock module (1), R hold be connected with comparator (4), Q holds and is connected with time delay module (3), above-mentioned load LED(5) one end connection input power, the other end is connected with inductance L (7); The other end of this inductance L (7) is connected with detection resistance (8), is also provided with switching tube M(9 between the two), switching tube M(9) be connected with above-mentioned time delay module (3), comparator (4) input is connected to and detects resistance (8) and switching tube M(9) between, described comparator (4) is also connected with reference voltage Vref (10), diode D(6) positive pole be connected between inductance L (7) and switching tube M (9), its negative pole is connected on load LED (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520331706.6U CN204598427U (en) | 2015-05-21 | 2015-05-21 | A kind of Unisolated switch power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520331706.6U CN204598427U (en) | 2015-05-21 | 2015-05-21 | A kind of Unisolated switch power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204598427U true CN204598427U (en) | 2015-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520331706.6U Expired - Fee Related CN204598427U (en) | 2015-05-21 | 2015-05-21 | A kind of Unisolated switch power circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204598427U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046367A (en) * | 2016-02-05 | 2017-08-15 | 精工半导体有限公司 | Switching regulaor |
| CN109496008A (en) * | 2017-09-12 | 2019-03-19 | 上海明石光电科技有限公司 | LED drive circuit, LED electron rectifier and LED illumination device |
-
2015
- 2015-05-21 CN CN201520331706.6U patent/CN204598427U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046367A (en) * | 2016-02-05 | 2017-08-15 | 精工半导体有限公司 | Switching regulaor |
| CN107046367B (en) * | 2016-02-05 | 2020-07-03 | 艾普凌科有限公司 | Switching regulator |
| TWI710202B (en) * | 2016-02-05 | 2020-11-11 | 日商艾普凌科有限公司 | Switching regulator |
| CN109496008A (en) * | 2017-09-12 | 2019-03-19 | 上海明石光电科技有限公司 | LED drive circuit, LED electron rectifier and LED illumination device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20180521 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |