CN205622225U - LED lamp strip short -circuit protection circuit based on boost circuit - Google Patents
LED lamp strip short -circuit protection circuit based on boost circuit Download PDFInfo
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- CN205622225U CN205622225U CN201620312769.1U CN201620312769U CN205622225U CN 205622225 U CN205622225 U CN 205622225U CN 201620312769 U CN201620312769 U CN 201620312769U CN 205622225 U CN205622225 U CN 205622225U
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Abstract
The utility model provides a LED lamp strip short -circuit protection circuit based on boost circuit, relates to short -circuit protection circuit technical field, and its boost circuit includes power supply interface, and power supply interface includes that low -voltage end and high voltage hold, and LED lamp strip short -circuit protection circuit includes voltage sampling circuit, controller and switch circuit, the utility model discloses a LED lamp strip just often, the low -voltage end is the low level, voltage sampling circuit gathers the input that the controller was delivered to to this low level, the controller makes switch circuit switch on, can discharge for the power supply of LED lamp strip in boost circuit's the return circuit of discharging, when the short circuit of LED lamp strip, be equivalent to that low -voltage end and high voltage end meet, be that voltage sampling circuit gathers the input that the controller was delivered to to the high level, the controller makes switch circuit break off, boost circuit's the return circuit of discharging stops to the power supply of LED lamp strip, thereby can realize the short -circuit protection to LED lamp strip, can avoid LED lamp strip to be burnt out.
Description
Technical field
The utility model relates to short-circuit protection circuit technical field, particularly relates to a kind of LED lamp bar short-circuit protection circuit based on booster circuit.
Background technology
Boostrap circuit is also booster circuit, utilizes the electronic components such as Bootstrap diode, Bootstrap electric capacity, makes electric capacity discharge voltage and supply voltage superposition, so that voltage raises. and the voltage that the circuit having raises can reach several times supply voltage.
It is that LED lamp bar is when powering that prior art uses booster circuit; it is usually the voltage output interface that LED lamp bar is inserted into booster circuit; if LED lamp bar itself is short-circuit; when being inserted into booster circuit; will generate heat serious; even LED lamp bar is burnt, accordingly, it would be desirable to short-circuit protection is carried out to LED lamp bar.
Utility model content
The purpose of this utility model is to avoid weak point of the prior art to provide a kind of LED lamp bar short-circuit protection circuit based on booster circuit; should can realize the short-circuit protection to LED lamp bar based on the LED lamp bar short-circuit protection circuit of booster circuit, LED lamp bar can be avoided to be burned out.
The purpose of this utility model is achieved through the following technical solutions:
A kind of LED lamp bar short-circuit protection circuit based on booster circuit is provided; described booster circuit includes the power supply interface for grafting LED lamp bar; described power supply interface includes low-voltage end and high voltage end; it is characterized in that: LED lamp bar short-circuit protection circuit includes voltage sampling circuit, controller and on-off circuit; described voltage sampling circuit is connected between described low-voltage end and the input of controller, and the output of described controller is connected in the discharge loop of described booster circuit through described on-off circuit.
Described controller is the chip that model is OB3350E, described model is that the pin FB of the chip of OB3350E is for receiving the voltage signal from described low-voltage end, described model is that the pin GATE of the chip of OB3350E for carrying out the break-make of the described on-off circuit of output signal control according to this voltage signal, described on-off circuit conducting then described booster circuit is that described LED lamp bar is powered, and described on-off circuit disconnects then described booster circuit to be stopped powering for described LED lamp bar.
Described booster circuit is Boost circuit, and it includes inductance, FET and commutation diode, and described inductance and FET are positioned in charge circuit, and described inductance and commutation diode are positioned in discharge loop,
Described on-off circuit includes triode, the base stage of described triode is connected to the pin GATE of the chip that described model is OB3350E, the emitter stage of described triode is connected to the grid of described FET, the grounded collector of described triode, the source ground of described FET, the drain electrode of described FET connects the positive pole of described commutation diode.
Described commutation diode has two, and two described commutation diodes are in parallel.
The beneficial effects of the utility model:
nullA kind of LED lamp bar short-circuit protection circuit based on booster circuit of the present utility model，Described booster circuit includes the power supply interface for grafting LED lamp bar，Described power supply interface includes low-voltage end and high voltage end，LED lamp bar short-circuit protection circuit includes voltage sampling circuit、Controller and on-off circuit，Described voltage sampling circuit is connected between described low-voltage end and the input of controller，The output of described controller is connected in the discharge loop of described booster circuit through described on-off circuit，The utility model is when LED lamp bar is normal，Described low-voltage end is low level，Voltage sampling circuit collects the input that this low level delivers to controller，Controller makes on-off circuit turn on，The discharge loop of booster circuit can discharge and power for LED lamp bar，When LED lamp bar inserts the power supply interface of booster circuit，I.e. LED lamp bar power end receives high voltage end and the low-voltage end of the power supply interface of booster circuit，When LED lamp bar short circuit，Be equivalent to described low-voltage end and described high voltage end connects，I.e. voltage sampling circuit collects the input that high level delivers to controller，Controller makes on-off circuit disconnect，The discharge loop of booster circuit stops powering for LED lamp bar，Thus the short-circuit protection to LED lamp bar can be realized，LED lamp bar can be avoided to be burned out.
Brief description
Accompanying drawing is utilized to be described further utility model, but the embodiment in accompanying drawing does not constitute to any restriction of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is the circuit diagram of a kind of LED lamp bar short-circuit protection circuit based on booster circuit of the present utility model.
Detailed description of the invention
With the following Examples the utility model is further described.
A kind of LED lamp bar short-circuit protection circuit based on booster circuit of the present embodiment; described booster circuit includes the power supply interface for grafting LED lamp bar; described power supply interface includes low-voltage end and high voltage end; LED lamp bar short-circuit protection circuit includes voltage sampling circuit, controller and on-off circuit; described voltage sampling circuit is connected between described low-voltage end and the input of controller, and the output of described controller is connected in the discharge loop of described booster circuit through described on-off circuit.
As shown in Figure 1, described booster circuit is Boost circuit, it includes that commutation diode D1F and D2F of inductance L3, FET Q6F and parallel connection, described inductance L3 and FET Q6F are positioned in charge circuit, and described inductance L3 and commutation diode D1F and D2F is positioned in discharge loop.
Described voltage sampling circuit includes sampling resistor R28F and R11F of series connection.
Described on-off circuit includes triode Q5F, the base stage of described triode Q5F is connected to the pin GATE of the chip that described model is OB3350E, the emitter stage of described triode Q5F is connected to the grid of described FET Q6F, the grounded collector of described triode Q5F, the source ground of described FET Q6F, the drain electrode of described FET Q6F connects the positive pole of described commutation diode D1F and D2F.
Described controller is the chip U3 that model is OB3350E, described power supply interface is CON1, 1 pin of described power supply interface CON1 and 2 pin are described high level interface, 3 pin of described CON1 are described low level interface, described model is that the pin FB of the chip U3 of OB3350E is for receiving the voltage signal of 3 pin from described CON1, described model is that the pin GATE of the chip U3 of OB3350E for coming conducting and the cut-off of the described triode Q5F of output signal control according to this voltage signal, described triode Q5F conducting then described booster circuit is that described LED lamp bar is powered, described triode Q5F cut-off then described booster circuit stops powering for described LED lamp bar.
When LED lamp bar inserts the power supply interface of booster circuit, i.e. LED lamp bar power end receives high voltage end (i.e. the 1st, 2 pin of CON1) and the low-voltage end (i.e. 3 pins of CON1) of the power supply interface of booster circuit.
nullThe present embodiment is when LED lamp bar is normal，3 pin of described CON1 are low level，This low level sampled resistance R28F and R11F delivers to the input of chip U3，The pin GATE of chip U3 sends high level and triode Q5F is turned on，FET Q6F turns on，The discharge loop of booster circuit can discharge and power for LED lamp bar，When LED lamp bar short circuit，3 pin of described CON1 and 1 pin of described CON1、2 pin connect，I.e. voltage sampling circuit collects the input that high level delivers to chip U3，The pin GATE of chip U3 sends low level and triode Q5F is ended，FET Q6F ends，The discharge loop of booster circuit stops powering for LED lamp bar，Thus the short-circuit protection to LED lamp bar can be realized，LED lamp bar can be avoided to be burned out.
Finally should be noted that; above example is only in order to illustrate the technical solution of the utility model; rather than the restriction to the utility model protection domain; although having made to explain to the utility model with reference to preferred embodiment; it will be understood by those within the art that; the technical solution of the utility model can be modified or equivalent, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (4)
1. the LED lamp bar short-circuit protection circuit based on booster circuit; described booster circuit includes the power supply interface for grafting LED lamp bar; described power supply interface includes low-voltage end and high voltage end; it is characterized in that: LED lamp bar short-circuit protection circuit includes voltage sampling circuit, controller and on-off circuit; described voltage sampling circuit is connected between described low-voltage end and the input of controller, and the output of described controller is connected in the discharge loop of described booster circuit through described on-off circuit.
2. a kind of LED lamp bar short-circuit protection circuit based on booster circuit as claimed in claim 1, it is characterized in that: described controller is the chip that model is OB3350E, described model is that the pin FB of the chip of OB3350E is for receiving the voltage signal from described low-voltage end, described model is that the pin GATE of the chip of OB3350E for carrying out the break-make of the described on-off circuit of output signal control according to this voltage signal, described on-off circuit conducting then described booster circuit is that described LED lamp bar is powered, described on-off circuit disconnects then described booster circuit to be stopped powering for described LED lamp bar.
3. a kind of LED lamp bar short-circuit protection circuit based on booster circuit as claimed in claim 2; it is characterized in that: described booster circuit is Boost circuit; it includes inductance, FET and commutation diode; described inductance and FET are positioned in charge circuit; described inductance and commutation diode are positioned in discharge loop
Described on-off circuit includes triode, the base stage of described triode is connected to the pin GATE of the chip that described model is OB3350E, the emitter stage of described triode is connected to the grid of described FET, the grounded collector of described triode, the source ground of described FET, the drain electrode of described FET connects the positive pole of described commutation diode.
4. a kind of LED lamp bar short-circuit protection circuit based on booster circuit as claimed in claim 3, it is characterised in that: described commutation diode has two, and two described commutation diodes are in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620312769.1U CN205622225U (en) | 2016-04-14 | 2016-04-14 | LED lamp strip short -circuit protection circuit based on boost circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620312769.1U CN205622225U (en) | 2016-04-14 | 2016-04-14 | LED lamp strip short -circuit protection circuit based on boost circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205622225U true CN205622225U (en) | 2016-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620312769.1U Active CN205622225U (en) | 2016-04-14 | 2016-04-14 | LED lamp strip short -circuit protection circuit based on boost circuit |
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| Country | Link |
|---|---|
| CN (1) | CN205622225U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120141A (en) * | 2018-09-27 | 2019-01-01 | 广州金升阳科技有限公司 | A kind of start-up circuit of high reliability |
-
2016
- 2016-04-14 CN CN201620312769.1U patent/CN205622225U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120141A (en) * | 2018-09-27 | 2019-01-01 | 广州金升阳科技有限公司 | A kind of start-up circuit of high reliability |
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