CN221127518U - Full-automatic self-recovery quick response short circuit protection circuit - Google Patents
Full-automatic self-recovery quick response short circuit protection circuit Download PDFInfo
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- CN221127518U CN221127518U CN202421013654.3U CN202421013654U CN221127518U CN 221127518 U CN221127518 U CN 221127518U CN 202421013654 U CN202421013654 U CN 202421013654U CN 221127518 U CN221127518 U CN 221127518U
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Abstract
The utility model discloses a full-automatic self-recovery quick response short-circuit protection circuit which is applied to an LED power supply and comprises a current sampling circuit, a short-circuit judging circuit, a voltage monitoring self-recovery circuit and a driving signal circuit; the structure can quickly respond to the short-circuit protection signal, can timely protect devices and avoid damaging the devices due to high current or excessively high peak voltage generated by short circuit; the MCU singlechip is not required to identify the short-circuit signal and then make protection, the required components are few, and the short-circuit protection function and the feedback of the short-circuit signal can be achieved with low cost; the short-circuit protection circuit is self-recovering and not locked, and can automatically recover the normal output state after the short-circuit fault is relieved, and the user can be helped to remove the short-circuit fault and can normally use the power without restarting the power.
Description
Technical Field
The utility model relates to the field of power supply circuits and controller circuits, in particular to a full-automatic self-recovery quick-response short-circuit protection circuit.
Background
In the existing switching power supply and LED dimming power supply, the output short-circuit protection circuit has the following modes:
1. the output current is amplified by the operational amplifier, then the signal is transmitted to the singlechip, and the driving signal is closed by the singlechip, so that the output MOS tube is protected, and the method has the defects that: for the short-circuit instantaneous high-current response speed mu s level, the corresponding speed of the singlechip, the judging time and the like of the operational amplifier, the corresponding speed of the short-circuit protection is not timely for protecting the MOS tube, the MOS tube is often damaged or directly locked, and the normal output state cannot be automatically recovered after the short-circuit fault is removed;
2. The advantage of fast response speed of the comparator is utilized to compare the output current with the set current value through the comparator, then the signal of the comparator is transmitted to the singlechip, and the output signal is closed through the singlechip, so the method has the defects that: the signal is detected by a singlechip, and in some power supplies without a singlechip scheme, the method is not used or the cost is increased;
3. The method has the defects that: RC time is not well controlled or the error is very large, and the circuit is complex, the cost is high, and even a blocking condition can occur (when a short circuit fault is removed, the power supply cannot automatically recover to normal output);
Therefore, a full-automatic self-recovery fast-response short-circuit protection circuit is urgently needed to solve the above-mentioned problems.
Disclosure of utility model
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a full-automatic self-recovery quick response short-circuit protection circuit.
The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows: the full-automatic self-recovery quick response short-circuit protection circuit is applied to an LED power supply and comprises a current sampling circuit, a short-circuit judging circuit, a voltage monitoring self-recovery circuit and a driving signal circuit;
The current sampling circuit is connected with the short circuit judging circuit and is used for detecting the output voltage of the LED power supply;
The short circuit judging circuit is connected with the voltage monitoring self-recovery circuit and is connected with the reference voltage, and is used for generating a first signal when the output voltage of the LED power supply is smaller than the reference voltage and generating a second signal when the output voltage of the LED power supply is larger than the reference voltage;
The drive signal circuit is connected with the voltage monitoring self-recovery circuit and is connected with the adjusting signal, and the voltage monitoring self-recovery circuit can conduct the adjusting signal and the drive signal circuit when receiving the first signal so that the drive signal circuit outputs the drive signal to the LED power supply, or cut off the adjusting signal and the drive signal circuit after waiting for a preset delay time when receiving the second signal so that the drive signal circuit stops outputting the drive signal to the LED power supply.
As one of the preferred embodiments of the present utility model, the short circuit judging circuit includes a comparator chip U1, a resistor R3, a resistor R15, and a capacitor C1-2, one end of the resistor R3 is connected to the current sampling circuit, the other end of the resistor R3 is connected to one end of the capacitor C2 and the IN-end of the comparator chip U1, respectively, the other end of the capacitor C2 and the VCC-end of the comparator chip U1 are grounded, the VCC-end of the comparator chip U1 is connected to a voltage VCC and grounded via the capacitor C1, the in+ end of the comparator chip U1 is connected to a reference voltage, and the OUT-end of the comparator chip U1 is connected to the voltage monitoring self-recovery circuit and connected to the voltage VCC via the resistor R15.
As one of the preferred embodiments of the present utility model, the full-automatic self-recovery fast-response short-circuit protection circuit further comprises a resistor R6 and a resistor R8, wherein one end of the resistor R6 is connected to the voltage VCC, and the other end of the resistor R6 is respectively connected to one end of the resistor R8 and the IN+ end of the comparator chip U1, and the other end of the resistor R8 is grounded to generate a reference voltage.
As one of the preferred embodiments of the present utility model, the voltage monitoring self-recovery circuit includes a self-recovery control chip U2, a resistor R4-5, a resistor R7 and a switching tube Q2, the VDD terminal of the self-recovery control chip U2 is connected to the short circuit judging circuit, the RESET terminal of the self-recovery control chip U2 is connected to one terminal of the resistor R4 and one terminal of the resistor R5, the other terminal of the resistor R5 is connected to one terminal of the resistor R7 and the control terminal of the switching tube Q2, the other terminal of the resistor R7 and the output terminal of the switching tube Q2 are grounded, and the input terminal of the switching tube Q2 is connected to the driving signal circuit and is connected to the voltage VCC via the resistor R2.
As one of the preferred embodiments of the present utility model, the model number of the self-recovery control chip U2 is set to TPS3809K33DBVR.
As one of the preferred embodiments of the present utility model, the switching transistor Q2 is provided as a triode or a MOS transistor.
As one of the preferred embodiments of the present utility model, the driving signal circuit includes a driving chip U3, resistors R9-14 and a switching tube Q3, where VCC of the driving chip U3 is connected to a voltage VCC2, IN end of the driving chip U3 is connected to one end of the resistor R14, an input end of the switching tube Q3 and one end of the resistor R11, a control end of the switching tube Q3 is connected to one end of the resistor R12 and one end of the resistor R13, the other end of the resistor R12 is connected to a voltage monitoring self-recovery circuit, OUT end of the driving chip U3 is connected to an output end of the LED power supply, in_th end of the driving chip U3 is connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is connected to a voltage VCC, and the other end of the resistor R10, the other end of the resistor R11, the other end of the resistor R13 and the output end of the switching tube Q3 are grounded.
As one of the preferred embodiments of the present utility model, the switching transistor Q3 is provided as a triode or a MOS transistor.
The utility model has the beneficial effects that:
1. The device can be protected in time by rapidly responding to a short-circuit protection signal (ns level), and the device is prevented from being damaged by high current or excessively high peak voltage generated by short circuit;
2. The MCU singlechip is not required to identify the short-circuit signal and then make protection, the required components are few, and the short-circuit protection function and the feedback of the short-circuit signal can be achieved with low cost;
3. The short-circuit protection circuit is self-recovering and not locked, and can automatically recover the normal output state after the short-circuit fault is relieved, and the user can be helped to remove the short-circuit fault and can normally use the power without restarting the power.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of an LED power supply and a fully automatic self-healing quick response short circuit protection circuit;
FIG. 2 is a schematic circuit diagram of a short circuit judging circuit and a voltage monitoring self-recovery circuit;
Fig. 3 is a schematic circuit diagram of a drive signal circuit.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless clearly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be connected directly or indirectly through an intermediary; the connecting device can be fixedly connected, detachably connected and integrally formed; may be a mechanical connection; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 3, a full-automatic self-recovery fast response short-circuit protection circuit is applied to an LED power supply 50, and comprises a current sampling circuit 10, a short-circuit judging circuit 20, a voltage monitoring self-recovery circuit 30 and a driving signal circuit 40;
The current sampling circuit 10 is connected with the short circuit judging circuit 20 and is used for detecting the output voltage of the LED power supply 50;
the short circuit judging circuit 20 is connected with the voltage monitoring self-recovery circuit 30 and connected with a reference voltage, and is used for generating a first signal when the output voltage of the LED power supply 50 is smaller than the reference voltage and generating a second signal when the output voltage of the LED power supply 50 is larger than the reference voltage;
The driving signal circuit 40 is connected to the voltage monitoring self-recovery circuit 30 and connected to the adjusting signal, and the voltage monitoring self-recovery circuit 30 can turn on the adjusting signal and the driving signal circuit 40 when receiving the first signal, so that the driving signal circuit 40 outputs the driving signal to the LED power supply 50, or can turn off the adjusting signal and the driving signal circuit 40 after waiting for a preset delay time when receiving the second signal, so that the driving signal circuit 40 stops outputting the driving signal to the LED power supply 50.
The working principle of the utility model is as follows:
① The LED power supply 50 comprises a main circuit and an MOS tube Q1, wherein the input end of the main circuit is connected with an alternating current power supply through a terminal L and a terminal N, the MOS tube Q1 is a device for controlling output, a driving signal output by the driving signal circuit 40 is connected to the grid electrode of the MOS tube Q1, the drain electrode of the MOS tube Q1 is connected with one end of a sampling resistor R1, the source electrode of the MOS tube Q1 is connected with one end of a load, the other end of the load is connected with the output end of the main circuit, the other end of the sampling resistor R1 is connected with the output end of the main circuit, and a voltage value is generated when the current flows through the sampling resistor R1;
② IN the short-circuit judging circuit 20, the short-circuit judging circuit 20 comprises a comparator chip U1, a resistor R3, a resistor R15 and a capacitor C1-2, wherein one end of the resistor R3 is connected with the current sampling circuit 10, the other end of the resistor R3 is respectively connected with one end of the capacitor C2 and the IN-end of the comparator chip U1, the other end of the capacitor C2 and the VCC-end of the comparator chip U1 are grounded, the VCC end of the comparator chip U1 is connected with a voltage VCC and is grounded through the capacitor C1, the IN+ end of the comparator chip U1 is connected with a reference voltage, and the OUT end of the comparator chip U1 is connected with the voltage monitoring self-recovery circuit 30 and is connected with the voltage VCC through the resistor R15; wherein U1 is a comparator, the resistor R6 and the resistor R8 obtain a reference voltage V1 according to a voltage division principle, the comparator chip U1 compares the voltage value at two ends of the sampling resistor R1 with the reference voltage V1, when the LED power supply 50 is in a normal output state, the voltage value at two ends of the sampling resistor R1 is smaller than the reference voltage V1, the OUT end of the comparator chip U1 outputs a high level (a first signal), and when the LED power supply 50 is in an output short circuit or an output overcurrent state, the voltage value at two ends of the sampling resistor R1 is greater than the reference voltage V1, and the OUT end of the comparator chip U1 outputs a low level (a second signal).
③ In the voltage monitoring self-recovery circuit 30, the voltage monitoring self-recovery circuit 30 comprises a self-recovery control chip U2, a resistor R4-5, a resistor R7 and a switch tube Q2, wherein the VDD end of the self-recovery control chip U2 is connected with the short circuit judging circuit 20, the RESET end of the self-recovery control chip U2 is respectively connected with one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R5 is respectively connected with one end of the resistor R7 and the control end of the switch tube Q2, the other end of the resistor R7 and the output end of the switch tube Q2 are grounded, and the input end of the switch tube Q2 is connected with the driving signal circuit 40 and is connected with a voltage VCC through the resistor R2; when the VDD terminal of the self-recovery chip U2 receives the signal transmitted from the comparator chip U1 and the signal transmitted from the comparator chip U1 is the first signal (output normal state), the VDD terminal of the self-recovery chip U2 is at high level, the RESET terminal of the self-recovery chip U2 is at high level, the switching tube Q2 is turned on, and the short circuit signal (overcurrent signal) is pulled down, so that the normal driving signal is not affected.
When the signal transmitted from the comparator chip U1 is the second signal (output short circuit state), the VDD terminal of the self-recovery chip U2 is low, the RESET terminal of the self-recovery chip U2 is low, the switching tube Q2 is not turned on, the short circuit signal (overcurrent signal) is pulled up, and the driving signal is pulled down.
④ IN the driving signal circuit 40, the driving signal circuit 40 comprises a driving chip U3, resistors R9-14 and a switch tube Q3, wherein a VCC end of the driving chip U3 is connected with a voltage VCC2, an IN end of the driving chip U3 is respectively connected with one end of a resistor R14, an input end of the switch tube Q3 and one end of a resistor R11, a control end of the switch tube Q3 is respectively connected with one end of a resistor R12 and one end of a resistor R13, the other end of the resistor R12 is connected with a voltage monitoring self-recovery circuit 30, an OUT end of the driving chip U3 is connected with an output end of an LED power supply 50, an IN_TH end of the driving chip U3 is respectively connected with one end of a resistor R9 and one end of a resistor R10, the other end of the resistor R9 is connected with the voltage VCC, and the other end of the resistor R10, the other end of the resistor R11 and the output end of the switch tube Q3 are grounded;
Specifically, an output short-circuit fault is taken as an example for explanation:
In the first state: when the output end of the LED power supply 50 has no short circuit fault, the short circuit signal is in a low level, the switching tube Q3 is not conducted, and at the moment, the driving signal output by the driving chip U3 to the MOS tube Q1 is the same as the adjusting signal, so that the normal adjusting state is not influenced;
In the second state: when the output end of the LED power supply 50 has a short circuit fault, the short circuit signal is high level, the switching tube Q3 is conducted, the adjusting signal is pulled down, the driving signal output by the driving chip U3 to the MOS tube Q1 is pulled down, and the MOS tube Q1 is turned off, so that the purpose of rapidly responding and protecting the output MOS tube Q1 is achieved;
In the third state: when the output short-circuit fault of the LED power supply 50 is not relieved, the MOS transistor Q1 is turned off, no loop is formed, and the current flowing through the sampling resistor R1 is 0, the comparator chip U1 will output a high level (first signal), when the self-recovery chip U2 receives the first signal transmitted by the comparator chip U1, the RESET end of the self-recovery chip U2 will automatically delay for a fixed time, then send out a high level again, the switch transistor Q2 is turned on, the short-circuit signal is low, the MOS transistor Q1 will be turned on along with the adjustment signal, and the step of the second state will be repeated because the short-circuit fault is not relieved yet;
In the fourth state: when the output short-circuit fault of the LED power supply 50 is released, the self-recovery chip U2 automatically delays for a fixed time, and then the switching tube Q2 is turned on, and the short-circuit signal is pulled down, so as to recover the first state.
⑤ The utility model has the advantages that:
1. The device can be protected in time by rapidly responding to a short-circuit protection signal (ns level), and the device is prevented from being damaged by high current or excessively high peak voltage generated by short circuit;
2. The MCU singlechip is not required to identify the short-circuit signal and then make protection, the required components are few, and the short-circuit protection function and the feedback of the short-circuit signal can be achieved with low cost;
3. The short-circuit protection circuit is self-recovering and not locked, and can automatically recover the normal output state after the short-circuit fault is relieved, and the user can be helped to remove the short-circuit fault and can normally use the power without restarting the power.
Preferably, the full-automatic self-recovery quick-response short-circuit protection circuit further comprises a resistor R6 and a resistor R8, wherein one end of the resistor R6 is connected with the voltage VCC, the other end of the resistor R6 is respectively connected with one end of the resistor R8 and the IN+ end of the comparator chip U1, and the other end of the resistor R8 is grounded to generate a reference voltage.
As a preferred embodiment of the self-recovery control chip U2, the model number of the self-recovery control chip U2 is set to TPS3809K33DBVR.
As a preferred embodiment of the switching transistor Q2 and the switching transistor Q3, the switching transistor Q2 and the switching transistor Q3 are provided as a transistor or a MOS transistor.
Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications and substitutions without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (8)
1. The full-automatic self-recovery quick-response short-circuit protection circuit is applied to an LED power supply (50), and is characterized in that: comprises a current sampling circuit (10), a short circuit judging circuit (20), a voltage monitoring self-recovery circuit (30) and a driving signal circuit (40);
The current sampling circuit (10) is connected with the short circuit judging circuit (20) and is used for detecting the output voltage of the LED power supply (50);
The short circuit judging circuit (20) is connected with the voltage monitoring self-recovery circuit (30) and is connected with a reference voltage, and is used for generating a first signal when the output voltage of the LED power supply (50) is smaller than the reference voltage and generating a second signal when the output voltage of the LED power supply (50) is larger than the reference voltage;
The driving signal circuit (40) is connected with the voltage monitoring self-recovery circuit (30) and is connected with an adjusting signal, the voltage monitoring self-recovery circuit (30) can conduct the adjusting signal and the driving signal circuit (40) when receiving the first signal so that the driving signal circuit (40) outputs the driving signal to the LED power supply (50), or cut off the adjusting signal and the driving signal circuit (40) after waiting for a preset delay time when receiving the second signal so that the driving signal circuit (40) stops outputting the driving signal to the LED power supply (50).
2. The fully automatic self-recovering fast response short circuit protection circuit according to claim 1, wherein: the short circuit judging circuit (20) comprises a comparator chip U1, a resistor R3, a resistor R15 and a capacitor C1-2, one end of the resistor R3 is connected with the current sampling circuit (10), the other end of the resistor R3 is respectively connected with one end of the capacitor C2 and the IN-end of the comparator chip U1, the other end of the capacitor C2 and the VCC-end of the comparator chip U1 are grounded, the VCC end of the comparator chip U1 is connected with a voltage VCC and is grounded through the capacitor C1, the IN+ end of the comparator chip U1 is connected with the reference voltage, and the OUT end of the comparator chip U1 is connected with the voltage monitoring self-recovery circuit (30) and is connected with the voltage VCC through the resistor R15.
3. The fully automatic self-recovering quick response short circuit protection circuit according to claim 2, wherein: the reference voltage generating circuit further comprises a resistor R6 and a resistor R8, wherein one end of the resistor R6 is connected with the voltage VCC, the other end of the resistor R6 is respectively connected with one end of the resistor R8 and the IN+ end of the comparator chip U1, and the other end of the resistor R8 is grounded to generate the reference voltage.
4. The fully automatic self-recovering fast response short circuit protection circuit according to claim 1, wherein: the voltage monitoring self-recovery circuit (30) comprises a self-recovery control chip U2, a resistor R4-5, a resistor R7 and a switch tube Q2, wherein the VDD end of the self-recovery control chip U2 is connected with the short circuit judging circuit (20), the RESET end of the self-recovery control chip U2 is respectively connected with one end of the resistor R4 and one end of the resistor R5, the other end of the resistor R5 is respectively connected with one end of the resistor R7 and the control end of the switch tube Q2, the other end of the resistor R7 and the output end of the switch tube Q2 are grounded, and the input end of the switch tube Q2 is connected with the driving signal circuit (40) and is connected with a voltage VCC through the resistor R2.
5. The fully automatic self-recovering quick response short circuit protection circuit according to claim 4, wherein: the model of the self-recovery control chip U2 is set to be TPS3809K33DBVR.
6. The fully automatic self-recovering quick response short circuit protection circuit according to claim 4, wherein: the switch tube Q2 is arranged as a triode or a MOS tube.
7. The fully automatic self-recovering fast response short circuit protection circuit according to claim 1, wherein: the driving signal circuit (40) comprises a driving chip U3, resistors R9-14 and a switch tube Q3, wherein a VCC end of the driving chip U3 is connected with a voltage VCC2, an IN end of the driving chip U3 is connected with one end of the resistor R14, an input end of the switch tube Q3 and one end of the resistor R11 respectively, a control end of the switch tube Q3 is connected with one end of the resistor R12 and one end of the resistor R13 respectively, the other end of the resistor R12 is connected with the voltage monitoring self-recovery circuit (30), an OUT end of the driving chip U3 is connected with an output end of an LED power supply (50), an IN_TH end of the driving chip U3 is connected with one end of the resistor R9 and one end of the resistor R10 respectively, the other end of the resistor R9 is connected with the voltage VCC, and the other end of the resistor R10, the other end of the resistor R11, the other end of the resistor R13 and the output end of the switch tube Q3 are grounded.
8. The fully automatic self-recovering quick response short circuit protection circuit of claim 7, wherein: the switch tube Q3 is arranged as a triode or a MOS tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421013654.3U CN221127518U (en) | 2024-05-11 | 2024-05-11 | Full-automatic self-recovery quick response short circuit protection circuit |
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| CN202421013654.3U CN221127518U (en) | 2024-05-11 | 2024-05-11 | Full-automatic self-recovery quick response short circuit protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118158855A (en) * | 2024-05-11 | 2024-06-07 | 珠海市圣昌电子有限公司 | LED power supply with self-recovery quick-response short-circuit protection function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118158855A (en) * | 2024-05-11 | 2024-06-07 | 珠海市圣昌电子有限公司 | LED power supply with self-recovery quick-response short-circuit protection function |
| CN118158855B (en) * | 2024-05-11 | 2024-08-30 | 珠海市圣昌电子有限公司 | LED power supply with self-recovery quick-response short-circuit protection function |
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