阅读说明：本技术 Led可控硅调光快速响应电路及led照明装置 (LED silicon controlled rectifier fast response circuit and LED lighting device of adjusting luminance ) 是由 叶桐林 于 2021-05-06 设计创作，主要内容包括：本发明提供了一种LED可控硅调光快速响应电路及LED照明装置,包括输入电压、充电电路、基准电压、检测电路、通断电路、泄电电路以及输出电压,其中：输入电压连接检测电路的输入端,检测电路的一个输出端通过通断电路连接充电电路,检测电路的另一个输出端连接泄电电路；输出电压设置在充电电路和泄电电路之间；基准电压为充电电路供电；通断电路断开时,充电电路对输出电压充电；通断电路连通时,放电电路对输出电压放电。本发明解决了LED可控硅调光时输出电流快速响应问题,即补偿电压如何快速充放电技术问题,保证LED电流在可控硅调光时能够快速响应并作出变化。(The invention provides an LED silicon controlled rectifier dimming fast response circuit and an LED lighting device, which comprise an input voltage, a charging circuit, a reference voltage, a detection circuit, an on-off circuit, a discharging circuit and an output voltage, wherein: the input voltage is connected with the input end of the detection circuit, one output end of the detection circuit is connected with the charging circuit through the on-off circuit, and the other output end of the detection circuit is connected with the discharging circuit; the output voltage is arranged between the charging circuit and the discharging circuit; the reference voltage supplies power to the charging circuit; when the on-off circuit is disconnected, the charging circuit charges the output voltage; when the on-off circuit is connected, the discharge circuit discharges the output voltage. The invention solves the problem of quick response of output current when the LED silicon controlled rectifier is dimmed, namely the technical problem of how to quickly charge and discharge compensation voltage, and ensures that the LED current can quickly respond and change when the silicon controlled rectifier is dimmed.)

1. The utility model provides a LED silicon controlled rectifier fast response circuit that adjusts luminance which characterized in that, includes input voltage, charging circuit, reference voltage, detection circuitry, on-off circuit, discharge circuit and output voltage, wherein:

the input voltage is connected with the input end of the detection circuit, one output end of the detection circuit is connected with the charging circuit through the on-off circuit, and the other output end of the detection circuit is connected with the discharging circuit;

the output voltage is arranged between the charging circuit and the discharging circuit;

the reference voltage supplies power to the charging circuit;

when the on-off circuit is disconnected, the charging circuit charges the output voltage;

when the on-off circuit is connected, the discharge circuit discharges the output voltage.

2. The LED silicon controlled rectifier dimming fast response circuit as claimed in claim 1, wherein the detection circuit comprises a resistor R7 and a resistor R8, one end of the resistor R7 is connected with the input voltage, the other end of the resistor R7 is connected with the resistor R8, and the other end of the resistor R8 is grounded.

3. The LED silicon controlled rectifier dimming fast response circuit as claimed in claim 2, wherein the on-off circuit comprises a transistor Q1, the base of the transistor Q1 is electrically connected between a resistor R7 and a resistor R8, and the emitter of the transistor Q1 is grounded; the collector of the transistor Q1 is connected to the charging circuit.

4. The LED silicon controlled rectifier dimming fast response circuit of claim 3, wherein the charging circuit comprises a transistor Q2, a resistor R9, a resistor R10 and a resistor R11, wherein:

one end of the resistor R9 and one end of the resistor R11 are connected with a reference voltage;

the other end of the resistor R9 and one end of the resistor R10 are connected with the base electrode of the triode Q2, and the other end of the resistor R10 is grounded;

the other end of the resistor R11 is connected with an emitting electrode of the triode Q2;

the collector of the transistor Q2 is connected to the output voltage.

5. The LED silicon controlled rectifier dimming fast response circuit as claimed in claim 2, wherein the detection circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the input voltage, the other end of the resistor R5 is connected with the resistor R6, and the other end of the resistor R6 is grounded.

6. The LED silicon controlled rectifier dimming fast response circuit of claim 5, wherein the bleeder circuit comprises a transistor Q3 and a resistor R12, wherein:

the base of the triode Q3 is connected between the resistor R5 and the resistor R6, the collector of the triode Q3 is connected with the output voltage, the emitter of the triode Q3 is connected with one end of the resistor R12, and the other end of the resistor R12 is grounded.

7. The LED scr dimming fast response circuit of claim 2, wherein the detection circuit further comprises a capacitor C5 connected in parallel with the resistor R8.

8. The LED silicon controlled rectifier dimming fast response circuit according to claim 1, wherein when the charging circuit works, the discharging circuit does not work; when the charging circuit does not work, the discharging circuit works.

9. The LED thyristor dimming fast response circuit of claim 5, wherein the detection voltage between the resistor R7 and the resistor R8 is greater than the detection voltage between the resistor R5 and the resistor R6.

10. An LED lighting device comprising the LED scr dimming fast response circuit as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to a dimming circuit, in particular to an LED silicon controlled rectifier dimming fast response circuit and an LED lighting device.

Background

In the prior art MR16 dimming application boost + linear topological circuit, the potential change of the LED current is set by the compensation capacitor potential. And through the voltage waveform of the LED-, charging and discharging of the Sine voltage waveform potential to the compensation capacitor are detected, and the adjustment of the LED current is realized. In the MR16 thyristor dimming application, the LED current response is slow when the thyristor dims the light fast, and the angle change speed of the thyristor can not be kept up with.

Because the value of the compensation capacitor needs to be 4.7-22 uF, a relatively stable voltage can be obtained, and the corresponding output current value is stable; however, since the charging/discharging current inside the compensation capacitor is relatively small, the compensation voltage will rise/fall slowly, i.e. the dimming up/down speed is slow.

The patent document CN105282905A discloses a dimming circuit and an LED power supply device having the same, wherein the dimming circuit particularly has a low level preventing unit, and one electrical end of the low level preventing unit is coupled to a control dimming unit of the dimming circuit, and the other electrical end of the low level preventing unit is coupled to a constant current source inside the dimming circuit; therefore, once a user connects the two or more power conversion units to the two or more LED light emitting devices respectively and adjusts the light emitting brightness of the LED light emitting devices by the single control dimming unit, the low level prevention unit can prevent the signal level of the dimming signal output by the control dimming unit from being pulled down to the low level when one group of power conversion units is damaged or short-circuited, thereby maintaining the normal operation of the other group of power conversion units and the dimming circuit matched with the power conversion units. But the above scheme cannot achieve fast dimming.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an LED silicon controlled rectifier dimming fast response circuit and an LED lighting device.

The invention provides an LED silicon controlled rectifier dimming fast response circuit which comprises an input voltage, a charging circuit, a reference voltage, a detection circuit, an on-off circuit, a discharging circuit and an output voltage, wherein:

the input voltage is connected with the input end of the detection circuit, one output end of the detection circuit is connected with the charging circuit through the on-off circuit, and the other output end of the detection circuit is connected with the discharging circuit;

the output voltage is arranged between the charging circuit and the discharging circuit;

the reference voltage supplies power to the charging circuit;

when the on-off circuit is disconnected, the charging circuit charges the output voltage;

when the on-off circuit is connected, the discharge circuit discharges the output voltage.

Preferably, the detection circuit comprises a resistor R7 and a resistor R8, one end of the resistor R7 is connected with the input voltage, the other end of the resistor R7 is connected with the resistor R8, and the other end of the resistor R8 is grounded.

Preferably, the on-off circuit comprises a triode Q1, the base electrode of the triode Q1 is electrically connected between a resistor R7 and a resistor R8, and the emitter electrode of the triode Q1 is grounded; the collector of the transistor Q1 is connected to the charging circuit.

Preferably, the charging circuit comprises a transistor Q2, a resistor R9, a resistor R10 and a resistor R11, wherein:

one end of the resistor R9 and one end of the resistor R11 are connected with a reference voltage;

the other end of the resistor R9 and one end of the resistor R10 are connected with the base electrode of the triode Q2, and the other end of the resistor R10 is grounded;

the other end of the resistor R11 is connected with an emitting electrode of the triode Q2;

the collector of the transistor Q2 is connected to the output voltage.

Preferably, the detection circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the input voltage, the other end of the resistor R5 is connected with the resistor R6, and the other end of the resistor R6 is grounded.

Preferably, the bleeder circuit comprises a transistor Q3 and a resistor R12, wherein:

the base of the triode Q3 is connected between the resistor R5 and the resistor R6, the collector of the triode Q3 is connected with the output voltage, the emitter of the triode Q3 is connected with one end of the resistor R12, and the other end of the resistor R12 is grounded.

Preferably, the detection circuit further comprises a capacitor C5 connected in parallel with the resistor R8.

Preferably, when the charging circuit works, the discharging circuit does not work; when the charging circuit does not work, the discharging circuit works.

Preferably, the detection voltage between the resistor R7 and the resistor R8 is larger than the detection voltage between the resistor R5 and the resistor R6.

The LED lighting device provided by the invention comprises the LED silicon controlled rectifier dimming fast response circuit.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the charging and discharging sizes of the compensation capacitor are set through the peripheral parameters, so that the output current can quickly respond to the change of the dimming angle of the silicon controlled rectifier, the dimming effect is more smooth and flexible visually, and the dimming is quicker; meanwhile, the current can reach the maximum rapidly, so that the starting speed is higher.

2. The invention solves the problem of quick response of output current when the LED silicon controlled rectifier is dimmed, namely the technical problem of how to quickly charge and discharge compensation voltage, and ensures that the LED current can quickly respond and change when the silicon controlled rectifier is dimmed.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a working principle diagram of the present invention.

Fig. 2 is a schematic diagram of an LED silicon controlled rectifier dimming fast response circuit of the present invention.

Fig. 3 is an application function diagram of the LED silicon controlled rectifier dimming fast response circuit.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1 to fig. 3, according to the LED scr dimming fast response circuit and the LED lighting device provided by the present invention, the dimming circuit has the following functions: the electric potential of during operation chip VC pin position can be in 0-4V, when the silicon controlled rectifier is transferred light, when the voltage of VC reaches maximum 4V, then begin to transfer light, specific:

1. the invention charges the compensation capacitor VC2 through a stable high voltage level in a certain current limiting mode, thereby achieving the functions of quick start and response; V5V in the high-order voltage acquisition chip can also be acquired from the voltage of an LED + on the boosting side. The current limiting mode can limit the current by adopting a resistor mode.

2. The present invention determines the dimming state by detecting the potential variation of the chip VC pin, for example, selecting the resistor voltage division mode, so as to control whether the high voltage level charges VC2, and control the on state of the BJT, but not limited thereto. The charging circuit is used as a charging circuit. And simultaneously, the voltage bit of VC2 is controlled to discharge to the ground or not, so as to achieve the effect of quick discharge, and the discharged circuit is used as a discharge circuit.

In combination with 1 and 2, when the dimming angle is increased, the VC potential is quickly reduced, the charging circuit works, the electricity discharging circuit does not work, the voltage of VC2 is quickly increased, and the dimming brightness of the LED is quickly increased; when the dimming angle is reduced, the VC potential is rapidly increased, the charging power does not work, the current leakage circuit works, the voltage of VC2 is rapidly reduced, and the dimming brightness of the LED is rapidly darkened.

The specific circuit schematic diagram is shown in fig. 2, the LED silicon controlled rectifier dimming fast response circuit of the present invention includes an input voltage, a charging circuit, a reference voltage, a detection circuit, an on-off circuit, a discharging circuit and an output voltage, wherein: the input voltage is connected with the input end of the detection circuit, one output end of the detection circuit is connected with the charging circuit through the on-off circuit, and the other output end of the detection circuit is connected with the discharging circuit; the output voltage is arranged between the charging circuit and the discharging circuit; the reference voltage supplies power to the charging circuit; when the on-off circuit is disconnected, the charging circuit charges the output voltage; when the on-off circuit is connected, the discharge circuit discharges the output voltage.

Furthermore, the detection circuit comprises a resistor R7 and a resistor R8, wherein one end of the resistor R7 is connected with an input voltage, the other end of the resistor R7 is connected with the resistor R8, and the other end of the resistor R8 is grounded. The on-off circuit comprises a triode Q1, the base electrode of the triode Q1 is electrically connected between a resistor R7 and a resistor R8, and the emitting electrode of the triode Q1 is grounded; the collector of the transistor Q1 is connected to the charging circuit. The charging circuit comprises a triode Q2, a resistor R9, a resistor R10 and a resistor R11, wherein: one end of the resistor R9 and one end of the resistor R11 are connected with a reference voltage; the other end of the resistor R9 and one end of the resistor R10 are connected with the base electrode of the triode Q2, and the other end of the resistor R10 is grounded; the other end of the resistor R11 is connected with an emitting electrode of the triode Q2; the collector of the transistor Q2 is connected to the output voltage. The detection circuit comprises a resistor R5 and a resistor R6, wherein one end of the resistor R5 is connected with an input voltage, the other end of the resistor R5 is connected with the resistor R6, and the other end of the resistor R6 is grounded. The detection circuit further includes a capacitor C5 connected in parallel with the resistor R8. The bleeder circuit comprises a transistor Q3 and a resistor R12, wherein: the base of the triode Q3 is connected between the resistor R5 and the resistor R6, the collector of the triode Q3 is connected with the output voltage, the emitter of the triode Q3 is connected with one end of the resistor R12, and the other end of the resistor R12 is grounded. When the charging circuit works, the discharging circuit does not work; when the charging circuit does not work, the discharging circuit works. The detection voltage between the resistor R7 and the resistor R8 is larger than the detection voltage between the resistor R5 and the resistor R6. When the thyristor phase-cuts the input voltage, the output LED current rapidly changes correspondingly.

Fig. 3 shows an application schematic diagram of the invention, and a DS9581D chip is adopted in the application circuit, so as to realize fast response of dimming.

According to the invention, the voltage VC1 in the booster circuit is changed when the dimming angle of the silicon controlled rectifier is changed, the resistor R7\ R8 is adopted as the detection voltage Q1b for the voltage VC1, and when the detection voltage Q1b is larger than or smaller than the base electrode of a triode Q1(NPN), whether the reference voltage V5V charges a capacitor VC2 through the triode Q2(PNP) is controlled, so that the effect of quick charging is achieved; meanwhile, a detection voltage Q3b obtained by R5/R6 resistance voltage division is arranged to control a triode Q3(NPN), the action of the triode Q3 is opposite to that of Q1, namely when Q2 is conducted, Q3 is in a closed state; when Q2 is off, Q3 is in an on state; and it should be noted that the detection voltage Q3b is less than the detection voltage Q1b, and the voltages of Q3b-Q1b are taken as hysteresis voltages, so that VC2 is prevented from being charged and discharged simultaneously due to errors of the voltage of the base Vbe of the triode.

The circuit of the invention can be used for detecting voltage by connecting 2 resistors R7 and R8 in series, and is connected with the base electrode of an NPN triode Q1, and the collector electrode of the triode Q1 is connected with the collector electrode of a PNP triode Q2; a reference voltage V5V is connected to an emitter of a triode Q2 through a voltage division point of series resistors R9 and R10, the reference voltage V5V is connected with an emitter of a triode Q2 through R11, a collector of the triode Q2 is connected to a compensation capacitor VC2, and the detection voltage judgment is completed on the part of circuits to charge compensation VC2, so that the functions of quick power-on, dimming and the like are achieved.

The invention uses 2 resistors R5 and R6 which are connected in series as detection voltage, the voltage dividing point of the resistor is connected with the base electrode of an NPN triode Q3, the collector electrode of the triode Q3 is connected with a compensation capacitor VC2, the emission set of the triode Q3 is connected to the ground through a resistor R12, the detection voltage judgment is completed by the partial circuit to discharge for the compensation VC2, and the function of fast dimming is achieved.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.