Simple dimming short-circuit protection circuit
By adding an energy storage circuit to the dimming circuit, and using diodes and capacitors to store energy to achieve short-circuit protection, the problems of complex circuits and high costs in existing dimming products are solved, and simple and reliable short-circuit protection is achieved.
Patent Information
- Application Number
- CN202422977692.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-04
AI Technical Summary
Existing smart dimming products require complex programming, which is costly and inconvenient to maintain. Existing current monitoring and short-circuit protection circuits are costly and highly integrated, but difficult to maintain.
An energy storage circuit is added to the existing circuit. The energy storage circuit, which consists of diodes and capacitors, stores energy and provides sufficient energy to keep the MOSFET conducting during a short circuit, thereby achieving short circuit protection.
The structure of the dimming short-circuit protection circuit has been simplified, reducing costs and improving circuit reliability and ease of maintenance.
Smart Images
Figure CN223528255U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a protection circuit, concretely is a simple light regulation short circuit protection circuit. BACKGROUND
[0002] Nowadays, the market demand for intelligent light regulation products is increasing, whether it is constant current light regulation or constant voltage light regulation. The constant current light regulation chip is very perfect, and the IC has various protection functions. The mainstream current monitoring short circuit protection circuit on the market realizes output short circuit protection by collecting current signals through an MCU. The constant voltage light regulation is currently composed of a single-chip microcomputer and a MOS to realize light regulation function. The light regulation protection circuit with an IC has high integration, few components, and simple debugging, and is widely used. However, the circuit needs to write complex programs, has high cost, is inconvenient to maintain, and has high maintenance cost. Therefore, the inventor designs a simple light regulation short circuit protection circuit. SUMMARY
[0003] The utility model discloses a simple light regulation short circuit protection circuit, which has a simple structure and a reasonable design. The short circuit protection function is improved by adding an energy storage circuit to the original circuit. The circuit performance is reliable, and the problems raised in the technical background are solved.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a simple light regulation short circuit protection circuit, comprising an energy storage circuit, a resistor R43, a resistor R44, a resistor R47, a resistor R48, a resistor R49, a resistor R50, a resistor R54, a capacitor C4, a capacitor C30, a capacitor C31, a diode D6, a diode D13, a triode Q3, a MOS tube Q2 and a switch SW1, wherein one end of the resistor R43 is connected with the 1st port of the switch SW1, and the other end is connected with the positive power supply end VOUT+; the two ends of the capacitor C30 are respectively connected with the 1st and 2nd pins of the switch SW1, one end of the resistor R50 is connected with the 3rd port of the switch SW1, and the other end is respectively connected with the capacitor C31, the resistor R54 and the base of the triode Q3; the emitter of the triode Q3 is connected with the negative power supply end V- of the power supply, and the collector is respectively connected with the resistor R47, the resistor R48 and the resistor R49; one end of the resistor R48 away from the triode Q3 is respectively connected with the diode D13 and the 1st pin of the MOS tube Q2; the 2nd pin of the MOS tube Q2 is connected with the negative power supply end V- of the power supply, and the 3rd pin is connected with the negative output end VOUT-; the capacitor C4, the resistor R44 and the diode D6 are connected in parallel, and one end of the capacitor C4, the resistor R44 and the diode D6 is connected with the positive power supply end VOUT+, and the other end is connected with the negative output end VOUT-; the input end of the energy storage circuit is connected with the positive power supply end VOUT+, and the output end is connected with the resistor R47.
[0005] Preferably, the energy storage circuit is composed of diode D11 and capacitor C29, wherein the negative terminal of diode D11 is connected with capacitor C29 and resistor R47 respectively, the positive terminal of diode D11 is connected with positive power supply terminal VOUT+, and the end of capacitor C29 away from diode D11 is connected with negative power supply terminal V-.
[0006] Preferably, capacitor C31 and resistor R54 are connected in parallel, and one end of capacitor C31 and resistor R54 is connected with negative power supply terminal V-, and the other end is connected with resistor R50 and the base of triode Q3 respectively.
[0007] Preferably, diode D13 is a voltage stabilizing diode.
[0008] Compared with the prior art, the utility model has the advantages of the following:
[0009] 1. The utility model provides a simple light regulation short circuit protection circuit, the light regulation short circuit protection circuit whole simple structure, reasonable in design, through increasing energy storage circuit on the original circuit, the energy storage circuit is composed of diode D11 and capacitor C29, wherein the negative terminal of diode D11 is connected with capacitor C29 and resistor R47 respectively, the positive terminal of diode D11 is connected with positive power supply terminal VOUT+, and the end of capacitor C29 away from diode D11 is connected with negative power supply terminal V-, when the pulse charging voltage passes through diode D11 and charges capacitor C29, stores energy, when output short circuit, the energy of capacitor C29 cannot be released through diode D11 to positive power supply terminal VOUT+ due to the one-way conduction of diode D11, and sufficient energy is provided by capacitor C29 to maintain the GS voltage of MOS tube Q2, so that MOS tube Q2 is completely turned on, and flyback circuit enters the burp protection state, so as to perfect the short circuit protection function. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is the circuit principle drawing of the utility model. DETAILED DESCRIPTION
[0011] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0012] In the description of the embodiments of the utility model, need understanding is, the term "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" "internal", "external" and so on indicate the orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model embodiments and simplifying the description, and is not indicating or implying that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore cannot be understood as a restriction on the utility model. In addition, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.
[0013] In the embodiments of the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrated; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.
[0014] Please refer to Figure 1The utility model provides a kind of simple dimming short circuit protection circuit: the dimming short circuit protection circuit includes energy storage circuit, resistance R43, resistance R44, resistance R47, resistance R48, resistance R49, resistance R50, resistance R54, capacitor C4, capacitor C30, capacitor C31, diode D6, diode D13, triode Q3, MOS tube Q2 and switch SW1, wherein one end of resistance R43 is connected with the 1st port of switch SW1, and the other end is connected with positive supply end VOUT+;Two ends of capacitor C30 are respectively connected with the 1st and 2nd pins of switch SW1, one end of resistance R50 is connected with the 3rd port of switch SW1, and the other end is respectively connected with capacitor C31, resistance R54 and the base of triode Q3;The emitter of triode Q3 is connected with the negative terminal V- of power supply, and the collector is respectively connected with resistance R47, resistance R48 and resistance R49;The 1st pin of MOS tube Q2 is connected with the negative terminal V- of power supply, and the 3rd pin is connected with negative output end VOUT-;Capacitor C4, resistance R44 and diode D6 are connected in parallel, and one end of capacitor C4, resistance R44 and diode D6 is connected with positive supply end VOUT+, and the other end is connected with negative output end VOUT-;The input end of energy storage circuit is connected with positive supply end VOUT+, and the output end is connected with resistance R47, and energy storage circuit is made of diode D11 and capacitor C29, wherein the negative terminal of diode D11 is respectively connected with capacitor C29 and resistance R47, and the positive terminal of diode D11 is connected with positive supply end VOUT+, and one end of capacitor C29, away from diode D11, is connected with the negative terminal V- of power supply.
[0015] Specifically, capacitor C31 and resistance R54 are connected in parallel, and one end of capacitor C31 and resistance R54 is connected with the negative terminal V- of power supply, and the other end is respectively connected with resistance R50 and the base of triode Q3.
[0016] Specifically, diode D13 is a voltage stabilizing diode in the embodiment.
[0017] Please refer to Figure 1 Due to the one-way conduction of diode D11, when pulse charging voltage passes through diode D11 to charge capacitor C29, energy is stored, when output short circuit occurs, the energy of capacitor C29 cannot be released to positive supply end VOUT+ through diode D11 due to the one-way conduction of diode D11, sufficient energy is provided by capacitor C29 to maintain the GS voltage of MOS tube Q2, MOS tube Q2 is completely turned on, and flyback circuit enters the hiccup protection state, so as to perfect the short circuit protection function.
[0018] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.
Claims
1. A simple dimming short circuit protection circuit, characterized by: The energy storage circuit, resistor R43, resistor R44, resistor R47, resistor R48, resistor R49, resistor R50, resistor R54, capacitor C4, capacitor C30, capacitor C31, diode D6, diode D13, transistor Q3, MOS tube Q2 and switch SW1 are included, wherein one end of the resistor R43 is connected with the No.1 port of the switch SW1, and the other end is connected with the positive power supply terminal VOUT+; two ends of the capacitor C30 are connected with the No.1 and No.2 pins of the switch SW1 respectively, one end of the resistor R50 is connected with the No.3 port of the switch SW1, and the other end is connected with the capacitor C31, the resistor R54 and the base of the transistor Q3 respectively; the emitter of the transistor Q3 is connected with the negative terminal V- of the power supply, and the collector is connected with the resistor R47, the resistor R48 and the resistor R49 respectively; one end of the resistor R48 away from the transistor Q3 is connected with the diode D13 and the No.1 pin of the MOS tube Q2 respectively; the No.2 pin of the MOS tube Q2 is connected with the negative terminal V- of the power supply, and the No.3 pin is connected with the negative output terminal VOUT-; the capacitor C4, the resistor R44 and the diode D6 are connected in parallel, and one end of the capacitor C4, the resistor R44 and the diode D6 is connected with the positive power supply terminal VOUT+, and the other end is connected with the negative output terminal VOUT-; the input end of the energy storage circuit is connected with the positive power supply terminal VOUT+, and the output end is connected with the resistor R47.
2. The simple dimming short-circuit protection circuit according to claim 1, characterized in that: The energy storage circuit is composed of diode D11 and capacitor C29, wherein the negative terminal of the diode D11 is connected with the capacitor C29 and the resistor R47 respectively, the positive terminal of the diode D11 is connected with the positive power supply terminal VOUT+, and one end of the capacitor C29 away from the diode D11 is connected with the negative terminal V- of the power supply.
3. The simple dimming short-circuit protection circuit according to claim 1, characterized in that: The capacitor C31 and the resistor R54 are connected in parallel, and one end of the capacitor C31 and the resistor R54 is connected with the negative terminal V- of the power supply, and the other end is connected with the resistor R50 and the base of the transistor Q3 respectively.
4. The simple dimming short-circuit protection circuit according to claim 1, characterized in that: The diode D13 is a voltage stabilizing diode.