CN210350770U - Overcurrent protection device - Google Patents
Overcurrent protection device Download PDFInfo
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- CN210350770U CN210350770U CN201921120923.5U CN201921120923U CN210350770U CN 210350770 U CN210350770 U CN 210350770U CN 201921120923 U CN201921120923 U CN 201921120923U CN 210350770 U CN210350770 U CN 210350770U
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- resistor
- protection device
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- power supply
- triode
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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 utility model discloses an overcurrent protection device, which at least comprises a power supply line provided with a power output end and a signal output end; the detection circuit is provided with a first resistor, a second resistor and a triode; a control circuit provided with a control chip; a turn-off circuit provided with a third resistor and a field effect tube; the signal output end of the power supply line is connected with a first resistor, and the first resistor is grounded after being connected with the emitting electrode of the triode; the second resistor is connected with the first resistor in parallel, the second resistor is connected with the base of the triode, the collector of the triode is connected with the trigger signal input pin of the control chip, the output end of the control chip is connected with the third resistor in series, the third resistor is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, and the power output is connected with the drain electrode of the field-effect tube. When the power supply circuit outputs signals, the signals flow to the control circuit through the detection circuit, and when the voltage of the output pin is higher than the reference voltage of the control chip, the output pin outputs high level to switch on the field effect transistor of the turn-off device, so that the driver circuit is switched off.
Description
Technical Field
The utility model relates to a dimmer circuit technical field, concretely relates to overcurrent protection device.
Background
In the prior art, the driver is used as an accessory and is combined with an LED lamp, the driver does not have a matching dimming function, namely, the driver can not be completely matched with dimmers such as a silicon controlled rectifier for use in normal work, the dimmers are mostly installed in a home circuit by a terminal user, once the driver is matched with the LED lamp to be used in the circuit of the dimmers such as the silicon controlled rectifier, when the dimmers are adjusted to a certain gear, the LED driver is damaged abnormally, and is heated at high temperature or even in fire.
The actual measurement finds that when the dimmer is used, the input current is greatly increased when the dimmer is used for dimming at a certain gear, so that the input related devices of the driver cannot bear the current and are heated and damaged, and serious people are in danger of firing.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect that exists among the prior art, provide a simple structure, use convenient, can in time prevent among the dimmer circuit, the problem of damage is given off heat to the relevant device of driver input that leads to because of the electric current surge.
In order to achieve the above purpose, the technical solution of the present invention is to design an overcurrent protection device, which at least includes a power supply line provided with a power output terminal and a signal output terminal; the detection circuit is provided with a first resistor, a second resistor and a triode; a control circuit provided with a control chip; a turn-off circuit provided with a third resistor and a field effect tube; the signal output end of the power supply line is connected with a first resistor, and the first resistor is grounded after being connected with the emitting electrode of the triode; the second resistor is connected with the first resistor in parallel, the second resistor is connected with the base of the triode, the collector of the triode is connected with the trigger signal input pin of the control chip, the output end of the control chip is connected with the third resistor in series, the third resistor is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, and the power output is connected with the drain electrode of the field-effect tube. When a signal is input in the circuit, the input current generates induced voltage on the first resistor, and the induced voltage is limited by the second resistor and then is input into the base electrode of the triode. When the induction voltage reaches the conduction voltage of the triode, the triode is conducted, at the moment, the voltage of the input pin of the control chip is pulled down to the ground, and the voltage signal of the input pin of the control chip is changed from high level to low level. After the control chip internal circuit detects that the input pin voltage is changed from high level to low level, the output pin of the control chip outputs a high level control voltage signal, and the high level signal is limited by a third resistor connected with the output end in series and then is input to the grid of the field effect transistor of the turn-off device. When the high-level control voltage signal reaches the conduction voltage of the field effect transistor, the field effect transistor is conducted, at the moment, a power output pin in a power supply line is short-circuited to the ground, and the power voltage is 0V, so that the power conversion output of the driver circuit is turned off. There is no normal power output, i.e. the input loop will not generate large current.
In order to be suitable for different products, a further preferable technical scheme is that a power supply output of a power supply line in the overcurrent protection device is connected with an anode of a first diode, a cathode of the first diode is connected with one end of a first capacitor, and the other end of the first capacitor is grounded.
In order to be suitable for different products, a further preferred technical scheme is that a cathode of a first diode in the overcurrent protection device is connected with one end of a fourth resistor, and the other end of the fourth resistor is respectively connected with an input pin of the control chip and a collector of the triode.
In order to be suitable for different products, a further preferable technical scheme is that a cathode of a first diode in the overcurrent protection device is connected with a power supply pin of a control chip.
In order to be suitable for different products, a further preferable technical scheme is that the cathode of a first diode in the overcurrent protection device is connected with a reset pin of a control chip.
In order to be suitable for different products, a further preferable technical scheme is that a cathode of a first diode in the overcurrent protection device is connected with a fifth resistor in series, and the fifth resistor is connected with a threshold pin of a control chip; the fifth resistor is also connected with the anode of a second diode, and the cathode of the second diode is connected with the drain of the field effect transistor.
In order to be suitable for different products, a control chip in the overcurrent protection device is provided with a control voltage pin which is connected in series with a second capacitor, and the other end of the second capacitor is grounded.
In order to be suitable for different products, a further preferable technical scheme is that a power supply input of a power supply line in the overcurrent protection device is grounded and/or a control chip is grounded.
In order to be suitable for different products, a further preferable technical scheme is that a triode of a detection circuit in the overcurrent protection device is of an NPN type.
In order to be suitable for different products, a further preferable technical scheme is that the model of a control chip in the overcurrent protection device is TS555 MD.
When the signal is input in the circuit, the signal flows to the control circuit through the detection circuit, and when the voltage of the output pin is higher than the reference voltage of the control chip, the output pin outputs high level, so that the turn-off device is turned on, and the circuit of the driver is turned off. When the power supply voltage of the control chip is reduced to the restart voltage threshold value of the control chip, the control chip control signal is reset, the field effect tube is turned off, and the driver circuit is restarted to prepare to enter the next working period.
Drawings
Fig. 1 is a schematic view of an overcurrent protection device of the present invention;
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the present invention relates to an overcurrent protection device, which comprises a power supply line having a power output terminal, a signal output terminal, a first diode D7, and a first capacitor C9; the detection circuit is provided with a first resistor RS1, a second resistor R14 and an NPN triode Q2; the control circuit is provided with a control chip U1, a fourth resistor R11, a fifth resistor R12, a second diode D8 and a second capacitor C10; a turn-off circuit consisting of a third resistor R13 and a field effect transistor Q1 is provided.
The signal output end of the power supply line is connected with a first resistor RS1, and the first resistor RS1 is connected with the emitter of an NPN triode Q2 and then grounded; the second resistor R14 is connected with the first resistor RS1 in parallel, the second resistor R14 is connected with the base electrode of an NPN triode Q2, the collector electrode of the NPN triode Q2 is connected with a trigger signal input pin 2 of a control chip U1, an output pin 3 of the control chip U1 is connected with the grid electrode of a field effect Q1 tube through a third resistor R13 which is connected in series, the source electrode of the field effect Q1 is grounded, and the drain electrode of the field effect Q1 is connected with the power output end; the power supply output end is connected with the positive electrode of a first diode D7, the negative electrode of D7 is connected with one end of a first capacitor C9, and the other end of the first capacitor C9 is grounded; the negative electrode of the first diode D7 is connected with one end of a fourth resistor R11, and the other end of the fourth resistor R11 is respectively connected with a trigger signal input pin 2 of a control chip U1 and the collector electrode of an NPN triode Q2; the negative electrode of the first diode D7 is connected with the power supply pin 8 of the control chip; the negative electrode of the first diode D7 is connected with a reset pin 4 of the control chip; the negative electrode of the first diode D7 is connected in series with one end of a fifth resistor R12, and the other end of the fifth resistor R12 is connected with a control chip threshold pin 6; the fifth resistor R12 is further connected to the anode of a second diode D8, and the cathode of the second diode D8 is connected to the drain of the field effect transistor Q1. Meanwhile, the control chip U1 is provided with a control voltage pin 5, and the control voltage pin 5 is grounded through a second capacitor C10 connected in series; the power supply of the power supply circuit is grounded, and the control chip is grounded; the power output of the power supply line is connected to an external dimmer circuit.
When a signal is input into the overcurrent protection device, an induced voltage is generated on the first resistor RS1, the induced voltage is limited by the R14 and then is input to the base electrode of the NPN triode Q2, when the induced voltage reaches the conduction voltage of the triode Q2, the triode Q2 is conducted, at the moment, the voltage of the trigger signal input pin 2 of the control chip U1 is pulled down to the ground, and the voltage signal of the trigger signal input pin 2 of the U1 chip is changed from a high level to a low level. When the voltage signal of the trigger signal input pin 2 is detected to be changed from high level to low level by the internal circuit of the U1 chip, a high level control voltage signal is output through the output pin 3, the signal is limited by the third resistor R13 and then input to the grid of the field effect transistor Q1 of the turn-off device, when the high level control voltage signal reaches the turn-on voltage of the field effect transistor Q1, the field effect transistor Q1 is turned on, and at the moment, the voltage of the power supply pin is pulled down to the ground. When the field effect transistor Q1 switches on, the power supply pin is short-circuited to ground, the power supply voltage is 0V, and the driving chip in the dimmer circuit cannot obtain stable voltage supply, so that the power supply voltage of the input pin of the driving chip is undervoltage to enter a protection state, and the power conversion output of the driver circuit is turned off. There is no normal power output, i.e. the input loop will not generate large current. And until the power supply voltage of a pin 8 of a control chip U1 in the overcurrent protection circuit is reduced to the restart voltage threshold value of the control chip, the control signal of a pin 3 output by the control chip U1 is reset, the field effect transistor Q1 is turned off, and the driver circuit is restarted to prepare to enter the next working period.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An overcurrent protection device is characterized by at least comprising a power supply circuit provided with a power supply output end and a signal output end; the detection circuit is provided with a first resistor, a second resistor and a triode; a control circuit provided with a control chip; a turn-off circuit provided with a third resistor and a field effect tube; the signal output end of the power supply line is connected with a first resistor, and the first resistor is grounded after being connected with the emitting electrode of the triode; the second resistor is connected with the first resistor in parallel, the second resistor is connected with the base of the triode, the collector of the triode is connected with the trigger signal input pin of the control chip, the output end of the control chip is connected with the third resistor in series, the third resistor is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, and the power output is connected with the drain electrode of the field-effect tube.
2. The overcurrent protection device as claimed in claim 1, wherein the power supply line of the overcurrent protection device has a power supply output connected to the anode of a first diode, the cathode of the first diode is connected to one end of a first capacitor, and the other end of the first capacitor is grounded.
3. The over-current protection device as claimed in claim 2, wherein a cathode of the first diode in the over-current protection device is connected to one end of a fourth resistor, and the other end of the fourth resistor is connected to the input pin of the control chip and the collector of the triode, respectively.
4. The over-current protection device as claimed in claim 3, wherein the negative electrode of the first diode in the over-current protection device is connected to the power supply pin of the control chip.
5. The over-current protection device as claimed in claim 4, wherein the negative electrode of the first diode in the over-current protection device is connected to the reset pin of the control chip.
6. The over-current protection device as claimed in claim 5, wherein a negative electrode of the first diode in the over-current protection device is connected in series with a fifth resistor, and the fifth resistor is connected with a threshold pin of the control chip; the fifth resistor is also connected with the anode of a second diode, and the cathode of the second diode is connected with the drain of the field effect transistor.
7. The over-current protection device as claimed in claim 6, wherein the control chip of the over-current protection device is provided with a control voltage pin connected in series with the second capacitor, and the other end of the second capacitor is grounded.
8. The over-current protection device as claimed in claim 1, wherein the power supply output of the power supply line and/or the control chip in the over-current protection device is grounded.
9. The overcurrent protection device as recited in claim 1, wherein a transistor of a detection circuit of the overcurrent protection device is NPN.
10. The overcurrent protection device as recited in claim 1, wherein the control chip in the overcurrent protection device is of type TS555 MD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921120923.5U CN210350770U (en) | 2019-07-17 | 2019-07-17 | Overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921120923.5U CN210350770U (en) | 2019-07-17 | 2019-07-17 | Overcurrent protection device |
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| Publication Number | Publication Date |
|---|---|
| CN210350770U true CN210350770U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921120923.5U Active CN210350770U (en) | 2019-07-17 | 2019-07-17 | Overcurrent protection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740382A (en) * | 2020-05-18 | 2020-10-02 | 欣旺达电子股份有限公司 | Load detection protection circuit |
| CN112259414A (en) * | 2020-09-18 | 2021-01-22 | 力神动力电池系统有限公司 | Low-side driving self-holding circuit of direct current contactor coil |
| CN112271109A (en) * | 2020-09-18 | 2021-01-26 | 力神动力电池系统有限公司 | High-side driving self-holding circuit of direct current contactor coil |
| CN114447893A (en) * | 2021-12-24 | 2022-05-06 | 镇江华扬机车车辆附件有限公司 | High-voltage direct-current switch and method for controlling on-off of load |
-
2019
- 2019-07-17 CN CN201921120923.5U patent/CN210350770U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740382A (en) * | 2020-05-18 | 2020-10-02 | 欣旺达电子股份有限公司 | Load detection protection circuit |
| CN111740382B (en) * | 2020-05-18 | 2023-02-03 | 欣旺达电子股份有限公司 | Load detection protection circuit |
| CN112259414A (en) * | 2020-09-18 | 2021-01-22 | 力神动力电池系统有限公司 | Low-side driving self-holding circuit of direct current contactor coil |
| CN112271109A (en) * | 2020-09-18 | 2021-01-26 | 力神动力电池系统有限公司 | High-side driving self-holding circuit of direct current contactor coil |
| CN112271109B (en) * | 2020-09-18 | 2024-05-28 | 力神（青岛）新能源有限公司 | High-side driving self-holding circuit of direct-current contactor coil |
| CN112259414B (en) * | 2020-09-18 | 2024-06-11 | 力神（青岛）新能源有限公司 | Low-side driving self-holding circuit of direct-current contactor coil |
| CN114447893A (en) * | 2021-12-24 | 2022-05-06 | 镇江华扬机车车辆附件有限公司 | High-voltage direct-current switch and method for controlling on-off of load |
| CN114447893B (en) * | 2021-12-24 | 2023-11-21 | 镇江华扬机车车辆附件有限公司 | High-voltage direct-current switch and method for controlling on-off of load by same |
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