CN105451401A - LED open-circuit voltage protection method and circuit and drive circuit using same - Google Patents
LED open-circuit voltage protection method and circuit and drive circuit using same Download PDFInfo
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- CN105451401A CN105451401A CN201610063233.5A CN201610063233A CN105451401A CN 105451401 A CN105451401 A CN 105451401A CN 201610063233 A CN201610063233 A CN 201610063233A CN 105451401 A CN105451401 A CN 105451401A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides an LED open-circuit voltage protection method and a circuit and a drive circuit using the same. The method comprises the steps that a Vcc end of a driving IC reaches a threshold starting voltage, and the driving IC is started to work; when working time reaches the preset working time, a high current is injected into the Vcc end of the driving IC; a charging voltage of a capacitor C2 of the Vcc end rises, a voltage stabilization value of a shunt regulator tube ZD2 of the Vcc end of the driving IC is achieved, and an overvoltage protection set value is obtained; the set value is maintained, and an overvoltage protection function is achieved. According to the LED open-circuit voltage protection method and the circuit and the drive circuit using the same, by means of a time-sharing multiplexing function of the Vcc end of the driving IC, under the situation that system work is not affected, the overvoltage protection voltage set value is set by means of the voltage value set by Vcc in the system. Meanwhile, when the integrated level of the driving IC is higher, the system overvoltage value is effectively controlled, and the overvoltage protection voltage function is achieved.
Description
Technical field
The present invention relates to the guard method of a kind of LED open circuit voltage and circuit and use the drive circuit of this circuit.
Background technology
LED development is relatively swifter and more violent, needs special drive IC to carry out driving LED. and in limited space, how to use the drive IC of small package, integrated more necessary function, can promote greatly developing of LED.As shown in Figure 1, existing overvoltage protection voltage setting method be IC pin be connected high resistance measurement between ground and set and protect magnitude of voltage, bring following problem like this:
One, IC is needed to have the pin of a special setting overpressure value;
Two, resistance is too high, and under moisture conditions, leakage current can affect the accuracy of over-voltage protection point;
If three system works in the unloaded state, inaccurate over-voltage protection point to cause in system components and parts withstand voltage and lost efficacy because exceeding components and parts.
The problems referred to above should be paid attention to and the problem solved in the design and production process of LED drive circuit.
Summary of the invention
The object of this invention is to provide the guard method of a kind of LED open circuit voltage and circuit and use the drive circuit of this circuit, without the need to increasing IC pin, utilizing Vcc to hold and setting overvoltage protection value, thus above-mentioned three kinds of problems can be avoided.
Technical solution of the present invention is:
The guard method of a kind of LED open circuit voltage and circuit and use the drive circuit of this circuit; utilize the Vcc pin time-sharing multiplex of drive IC; when not affecting drive IC work, utilizing the magnitude of voltage of Vcc setting in drive IC to set the voltage setting value of overvoltage protection, being specially:
The Vcc end of drive IC reaches startup threshold voltage, drive IC startup work;
After operating time reaches the default operating time, the Vcc end toward drive IC injects big current;
The electric capacity C2 charging voltage of Vcc end raises, and the Vcc reaching drive IC holds the voltage stabilizing value of shunt regulator tube ZD2, thus obtains overvoltage protection set point; Keep this set point, realize over-voltage protecting function.
Further, after the voltage setting value of overvoltage protection has set, stop injecting big current, the Vcc end of drive IC returns to steady operation value.
Further, after the voltage setting value of overvoltage protection has set, do not stop injecting big current, the Vcc end of drive IC remains on voltage-stabiliser tube voltage stabilizing value in parallel always.
Further, after the voltage setting value of overvoltage protection has set, do not stop injecting big current, the Vcc end of drive IC remains on voltage-stabiliser tube voltage stabilizing value in parallel always.
Further, in drive IC, Vcc end connects the negative pole of voltage-stabiliser tube ZD2, the plus earth of voltage-stabiliser tube ZD2.
Further, in drive IC, Vcc end connects logic control chip, the control end of logic control chip connects the grid of field effect transistor by resistance R4, the intersection of the grid of resistance R4 and field effect transistor is also connected with the positive pole of diode D6, the negative pole of diode D6 passes through the intersection of resistance R5 contact resistance R4 andlogic control chip, and the drain electrode of field effect transistor connects internal fet drain electrode end, and the source electrode of field effect transistor connects current sample end.
Further, big current adopts the electric current being more than or equal to 1mA.
A kind of LED open circuit voltage protective circuit, comprise Vcc end, internal fet drain electrode end, current sample end, Vcc end connects logic control chip, the control end of logic control chip connects the grid of field effect transistor by resistance R4, the intersection of the grid of resistance R4 and field effect transistor is also connected with the positive pole of diode D6, the negative pole of diode D6 passes through the intersection of resistance R5 contact resistance R4 andlogic control chip, the drain electrode of field effect transistor connects internal fet drain electrode end, and the source electrode of field effect transistor connects current sample end; The open circuit voltage guard method of this LED open circuit voltage protective circuit is realized by any one of claim 1-5.
A kind of LED drive circuit, comprise electric capacity C1, current-limiting resistance R1, voltage-stabiliser tube ZD1, electric capacity C2 and light-emitting diode, the negative pole of light-emitting diode connects the positive pole of diode D5 by inductance L 1, the positive pole of the negative pole connecting luminous diode of diode D5, current-limiting resistance R1, voltage-stabiliser tube ZD1 are connected on the outlet side of supply voltage, voltage-stabiliser tube ZD1 is parallel with electric capacity C2, the minus earth of voltage-stabiliser tube ZD1, and current-limiting resistance R1, voltage-stabiliser tube ZD1 are parallel with electric capacity C1 jointly;
Also comprise LED open circuit voltage protective circuit according to claim 6 and current sampling resistor R3; current sample end connects the positive pole of voltage-stabiliser tube ZD1 and ground connection by current sampling resistor R3; Vcc end is by the positive pole of current sampling resistor R3 connecting luminous diode; Vcc end is same one end with the open-circuit-protection voltage-regulation end of LED open circuit voltage protective circuit; internal fet drain electrode end is by the negative pole of inductance connecting luminous diode, and the positive pole of light-emitting diode connects the cathode output end of supply voltage.
The invention has the beneficial effects as follows: the guard method of this kind of LED open circuit voltage and circuit and use the drive circuit of this circuit; the Vcc of drive IC is utilized to hold the function of time-sharing multiplex; when not influential system work, utilize the magnitude of voltage of Vcc setting in system to set OVP voltage setting value.While drive IC integrated level is higher, effective control system overpressure value, realizes over-voltage protecting function.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of drive IC and LED in prior art.
Fig. 2 is the process description schematic diagram of embodiment LED open circuit voltage guard method
Fig. 3 is the connection diagram of a LED open circuit voltage protective circuit concrete example in embodiment.
Fig. 4 is a kind of circuit connection diagram that drive IC is connected with LED.
Fig. 5 is the alternative circuit connection diagram that drive IC is connected with LED.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
Embodiment
The guard method of a kind of LED open circuit voltage and circuit and use the drive circuit of this circuit; utilizing the Vcc pin time-sharing multiplex of drive IC, when not affecting drive IC work, utilizing the magnitude of voltage of Vcc setting in drive IC to set the voltage setting value of overvoltage protection; as Fig. 2, be specially:
The Vcc end of drive IC reaches startup threshold voltage, drive IC startup work;
After operating time reaches the default operating time, the Vcc end toward drive IC injects big current;
The electric capacity C2 charging voltage of Vcc end raises, and the Vcc reaching drive IC holds the voltage stabilizing value of shunt regulator tube ZD2, thus obtains overvoltage protection set point; Keep this set point, realize over-voltage protecting function.
After the voltage setting value of overvoltage protection has set, stop injecting big current, the Vcc end of drive IC returns to steady operation value.
After the voltage setting value of overvoltage protection has set, do not stop injecting big current, the Vcc end of drive IC remains on voltage-stabiliser tube voltage stabilizing value in parallel always.
As Fig. 3, LED open circuit voltage protective circuit comprises voltage control circuit, logic control chip, current sampling circuit, under-voltage protecting circuit.
The current sample end of drive IC connects the in-phase input end of amplifier, the reverse inter-input-ing ending grounding of amplifier, amplifier output connect the second input of NAND gate, the first input end of NAND gate connects logic control chip and voltage control circuit respectively, and logic control chip connects the output of NAND gate.
In embodiment, voltage control circuit comprises field effect transistor, resistance R4, resistance R5, diode D6, the positive pole of diode D6 connects the grid of field effect transistor, the drain electrode of field effect transistor connects the internal fet drain electrode end of drive IC, the source electrode of field effect transistor connects the current sample end of drive IC, the negative pole of diode D6 connects logic control chip by resistance R5, diode D6 and the common parallel resistance R4 of resistance R5.
The Vcc end of drive IC connects under-voltage protecting circuit, logic control chip respectively, and the Vcc end of drive IC also connects the negative pole of voltage-stabiliser tube ZD2, the plus earth of voltage-stabiliser tube ZD2.
In drive IC, the Vcc end of drive IC reaches startup threshold voltage, drive IC startup work; After operating time reaches the default operating time, such as 2ms, the Vcc end toward drive IC injects big current, big current >=1mA, such as 1mA; Electric capacity C2 charging voltage raises, and the Vcc reaching drive IC holds the voltage stabilizing value of shunt regulator tube ZD2, thus obtains overvoltage protection set point; Keep this set point, realize over-voltage protecting function; After overvoltage protection sets, stop injecting big current, the Vcc end of drive IC returns to steady operation value.
After overvoltage protection sets, also can not stop injecting big current, Vcc end remains on voltage-stabiliser tube voltage stabilizing value in parallel always, but system power dissipation can be larger.
If Vcc does not have shunt regulator tube in system, then electric capacity C2 voltage can reach the inner integrated equivalent voltage-stabiliser tube voltage stabilizing value of IC, then without OVP protection or the OVP protection voltage setting value realizing preset default.
In order to improve system rejection to disturbance, in system, hold voltage-stabiliser tube voltage stabilizing value in parallel and OVP voltage setting value one-to-one relationship with Vcc.
Drive IC stable state Vcc is low voltage value, such as 6V, inner integrated high voltage value, such as 25V, equivalent voltage-stabiliser tube.In systems in which, the voltage-stabiliser tube of the Vcc end setting in parallel OVP value of drive IC, such as 8.2V to 24V, voltage-stabiliser tube voltage stabilizing value in parallel and OVP voltage setting value have one-to-one relationship, and can be linear relation, also can be nonlinear relation.As Fig. 3, Fig. 5, drive IC can also comprise earth terminal.
Fig. 4 gives a concrete example of the drive IC connection LED of embodiment, this kind of LED drive circuit, comprise electric capacity C1, current-limiting resistance R1, voltage-stabiliser tube ZD1, electric capacity C2 and light-emitting diode, the negative pole of light-emitting diode connects the positive pole of diode D5 by inductance L 1, the positive pole of the negative pole connecting luminous diode of diode D5, current-limiting resistance R1, voltage-stabiliser tube ZD1 is connected on the outlet side of supply voltage, voltage-stabiliser tube ZD1 is parallel with electric capacity C2, the minus earth of voltage-stabiliser tube ZD1, current-limiting resistance R1, voltage-stabiliser tube ZD1 is parallel with electric capacity C1 jointly, also comprise drive IC and current sampling resistor R3.As Fig. 4, Fig. 5, also comprise the rectification circuit for alternating voltage being converted to pulse voltage.The positive pole of light-emitting diode connects the positive pole of electrochemical capacitor C3, the negative pole of the negative pole connecting luminous diode of electrochemical capacitor C3.
The guard method of this kind of LED open circuit voltage and circuit and use the drive circuit of this circuit, utilize the Vcc of drive IC to hold the function of time-sharing multiplex, when not influential system work, utilizes the magnitude of voltage of Vcc setting in system to set OVP voltage setting value.While drive IC integrated level is higher, effective control system overpressure value, realizes over-voltage protecting function.
The current sample end of drive IC connects the positive pole of voltage-stabiliser tube ZD1 and ground connection by current sampling resistor R3; the Vcc of drive IC holds the positive pole by current sampling resistor R3 connecting luminous diode; the Vcc end of drive IC is same one end with the open-circuit-protection voltage-regulation end of drive IC, adopts Vcc to hold complex function to set overvoltage protection value.The internal fet drain electrode end of drive IC passes through the negative pole of inductance connecting luminous diode, and the positive pole of light-emitting diode connects the cathode output end of supply voltage.
Claims (8)
1. a LED open circuit voltage guard method, is characterized in that:
Utilize the Vcc pin time-sharing multiplex of drive IC, when not affecting drive IC work, utilizing the magnitude of voltage of Vcc setting in drive IC to set the voltage setting value of overvoltage protection, being specially:
The Vcc end of drive IC reaches startup threshold voltage, drive IC startup work;
After operating time reaches the default operating time, the Vcc end toward drive IC injects big current;
The electric capacity C2 charging voltage of Vcc end raises, and the Vcc reaching drive IC holds the voltage stabilizing value of shunt regulator tube ZD2, thus obtains overvoltage protection set point; Keep this set point, realize over-voltage protecting function.
2. LED open circuit voltage guard method as claimed in claim 1, is characterized in that: after the voltage setting value of overvoltage protection set, stop injecting big current, the Vcc of drive IC holds and returns to steady operation value.
3. LED open circuit voltage guard method as claimed in claim 1, is characterized in that: after the voltage setting value of overvoltage protection set, do not stop injecting big current, the Vcc end of drive IC remains on the voltage-stabiliser tube voltage stabilizing value of parallel connection always.
4. the LED open circuit voltage guard method as described in any one of claim 1-3, is characterized in that: in drive IC, and Vcc end connects the negative pole of voltage-stabiliser tube ZD2, the plus earth of voltage-stabiliser tube ZD2.
5. the LED open circuit voltage guard method as described in any one of claim 1-3; it is characterized in that: in drive IC; Vcc end connects logic control chip; the control end of logic control chip connects the grid of field effect transistor by resistance R4; the intersection of the grid of resistance R4 and field effect transistor is also connected with the positive pole of diode D6; the negative pole of diode D6 passes through the intersection of resistance R5 contact resistance R4 andlogic control chip; the drain electrode of field effect transistor connects internal fet drain electrode end, and the source electrode of field effect transistor connects current sample end.
6. the LED open circuit voltage guard method as described in any one of claim 1-3, is characterized in that: big current adopts the electric current being more than or equal to 1mA.
7. a LED open circuit voltage protective circuit, it is characterized in that: comprise Vcc end, internal fet drain electrode end, current sample end, Vcc end connects logic control chip, the control end of logic control chip connects the grid of field effect transistor by resistance R4, the intersection of the grid of resistance R4 and field effect transistor is also connected with the positive pole of diode D6, the negative pole of diode D6 passes through the intersection of resistance R5 contact resistance R4 andlogic control chip, the drain electrode of field effect transistor connects internal fet drain electrode end, and the source electrode of field effect transistor connects current sample end; The open circuit voltage guard method of this LED open circuit voltage protective circuit is realized by any one of claim 1-5.
8. a LED drive circuit, it is characterized in that: comprise electric capacity C1, current-limiting resistance R1, voltage-stabiliser tube ZD1, electric capacity C2 and light-emitting diode, the negative pole of light-emitting diode connects the positive pole of diode D5 by inductance L 1, the positive pole of the negative pole connecting luminous diode of diode D5, current-limiting resistance R1, voltage-stabiliser tube ZD1 are connected on the outlet side of supply voltage, voltage-stabiliser tube ZD1 is parallel with electric capacity C2, the minus earth of voltage-stabiliser tube ZD1, and current-limiting resistance R1, voltage-stabiliser tube ZD1 are parallel with electric capacity C1 jointly;
Also comprise LED open circuit voltage protective circuit according to claim 6 and current sampling resistor R3; current sample end connects the positive pole of voltage-stabiliser tube ZD1 and ground connection by current sampling resistor R3; Vcc end is by the positive pole of current sampling resistor R3 connecting luminous diode; Vcc end is same one end with the open-circuit-protection voltage-regulation end of LED open circuit voltage protective circuit; internal fet drain electrode end is by the negative pole of inductance connecting luminous diode, and the positive pole of light-emitting diode connects the cathode output end of supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610063233.5A CN105451401B (en) | 2016-01-31 | 2016-01-31 | Drive circuit of the LED open-circuit voltages guard method with circuit and using the circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610063233.5A CN105451401B (en) | 2016-01-31 | 2016-01-31 | Drive circuit of the LED open-circuit voltages guard method with circuit and using the circuit |
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| CN105451401A true CN105451401A (en) | 2016-03-30 |
| CN105451401B CN105451401B (en) | 2018-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786450A (en) * | 2016-11-25 | 2017-05-31 | 北京集创北方科技股份有限公司 | Overvoltage crowbar and its control method and LED drive device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616520A (en) * | 2009-08-03 | 2009-12-30 | 上海晶丰明源半导体有限公司 | A kind of LED open circuit guard circuit featuring low cost and high reliability |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN103166210A (en) * | 2011-12-19 | 2013-06-19 | 隆达电子股份有限公司 | Overvoltage protection circuit and drive circuit |
| US20140191673A1 (en) * | 2013-01-07 | 2014-07-10 | Posco Led Company Ltd. | LED DRIVING CIRCUIT HAVING Vcc STABILIZATION CIRCUIT |
-
2016
- 2016-01-31 CN CN201610063233.5A patent/CN105451401B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616520A (en) * | 2009-08-03 | 2009-12-30 | 上海晶丰明源半导体有限公司 | A kind of LED open circuit guard circuit featuring low cost and high reliability |
| CN102740538A (en) * | 2011-04-13 | 2012-10-17 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN103166210A (en) * | 2011-12-19 | 2013-06-19 | 隆达电子股份有限公司 | Overvoltage protection circuit and drive circuit |
| US20140191673A1 (en) * | 2013-01-07 | 2014-07-10 | Posco Led Company Ltd. | LED DRIVING CIRCUIT HAVING Vcc STABILIZATION CIRCUIT |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786450A (en) * | 2016-11-25 | 2017-05-31 | 北京集创北方科技股份有限公司 | Overvoltage crowbar and its control method and LED drive device |
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| CN105451401B (en) | 2018-05-15 |
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Effective date of registration: 20200414 Address after: 201100 room ta228, building 1, No. 450, Husong Road, Minhang District, Shanghai Patentee after: Shanghai Zhihong Electric Technology Co., Ltd Address before: 241009 No. 5, steam Road, Wuhu economic and Technological Development Zone, Anhui, 2-05 Patentee before: WUHU RUIXIN ELECTRONIC TECHNOLOGY Co.,Ltd. |