CN220673978U - Silicon controlled rectifier dimming active bleeder circuit - Google Patents
Silicon controlled rectifier dimming active bleeder circuit Download PDFInfo
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- CN220673978U CN220673978U CN202322320419.2U CN202322320419U CN220673978U CN 220673978 U CN220673978 U CN 220673978U CN 202322320419 U CN202322320419 U CN 202322320419U CN 220673978 U CN220673978 U CN 220673978U
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- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 71
- 239000010703 silicon Substances 0.000 title claims abstract description 71
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 11
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Abstract
The embodiment of the utility model relates to a silicon controlled rectifier dimming active bleeder circuit, wherein a power MOS tube Q7 is an NMOS tube, the drain electrode is connected with the output of the silicon controlled rectifier, and the source electrode is connected with a bleeder resistor R15 in series and grounded; the anode of the diode D3 is connected with the current limiting resistor R13 and the power supply Vcc, and the cathode of the diode D3 is connected with the grid electrode of the power MOS tube Q7; the triode Q8 is a PNP tube, the emitter is connected with the grid electrode of the power MOS tube Q7, the collector is grounded, the base is connected with the cathode of the zener diode ZD3, and the anode of the diode D3 is connected; the positive electrode of the zener diode ZD3 is grounded; the voltage dividing resistor R14 and the voltage dividing resistor R17 are connected in series between the output of the silicon controlled rectifier and the ground, wherein one end of the voltage dividing resistor R14 is connected with the output of the silicon controlled rectifier, the other end of the voltage dividing resistor R14 is connected in series with the voltage dividing resistor R17 at a potential reference point a, and the other end of the voltage dividing resistor R17 is grounded; the positive electrode of the shunt voltage stabilizer U2 is grounded, the negative electrode of the shunt voltage stabilizer U2 is connected with the positive electrode of the diode D3, and the reference terminal is connected with the potential reference point a.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a silicon controlled rectifier dimming active bleeder circuit.
Background
As the earth's air temperature warms, people begin to appreciate the importance of energy conservation and emission reduction. It is counted that, in all the energy consumption, the lighting power consumption accounts for about 20% of the total energy consumption, so how to reduce the lighting power consumption is an important issue. The LED has the advantages of low power consumption, high brightness, energy conservation, environmental protection, small volume, long service life and the like, and is widely applied at present.
The traditional LED always operates at fixed power after being turned on, and the energy consumption is kept unchanged. In order to further reduce the power consumption, the LED dimming technology can flexibly dim according to actual scenes, so that the input power is reduced, and the energy consumption is reduced.
The controllable silicon chops a part of sine wave voltage input by the power grid by adjusting the opening angle of the controllable silicon, and the brightness of the output LED lamp light is adjusted according to the requirement, so that energy is saved. The silicon controlled rectifier normally works and needs to have a minimum maintaining current, when the light is cut to a minimum angle, the current flowing through the silicon controlled rectifier is always lower than the maintaining current, and the silicon controlled rectifier is conducted again after being charged in the next period, so that the silicon controlled rectifier is easily turned off in advance, the LED work is affected, and the flicker visible to naked eyes is generated. And because the types of the thyristors in the market are different, the characteristics of the thyristors are different, the minimum maintaining current difference of the thyristor dimming circuit is larger, and if the maintaining current is insufficient, the thyristors are turned off in advance, so that the problems of LED lamp flashing and audio noise are caused, and the use is influenced.
Disclosure of Invention
The utility model aims to provide a silicon controlled rectifier dimming active bleeder circuit which can improve the compatibility and the adaptability of an LED drive to a silicon controlled rectifier and avoid the problem that under the condition that the conduction angle of the silicon controlled rectifier is small, the current is insufficient to maintain the conduction state of the silicon controlled rectifier to cause the silicon controlled rectifier to be turned off in advance to disconnect a circuit connected with the LED, so that the LED is extinguished or flickers.
To this end, an embodiment of the present utility model provides a silicon controlled rectifier dimming active bleeder circuit, including: the power MOS tube Q7, the bleeder resistor R15, the diode D3, the voltage stabilizing diode ZD3, the triode Q8, the current limiting resistor R13, the shunt regulator U2, the voltage dividing resistors R14 and R17;
the power MOS tube Q7 is an NMOS tube, the drain electrode is connected with the output of the silicon controlled rectifier, and the source electrode is connected with the bleeder resistor R15 in series and grounded;
the anode of the diode D3 is connected with a current limiting resistor R13 and a power supply Vcc, and the cathode of the diode D3 is connected with the grid electrode of the power MOS tube Q7;
the triode Q8 is a PNP tube, the emitter is connected with the grid electrode of the power MOS tube Q7, the collector is grounded, the base is connected with the cathode of the zener diode ZD3, and the base is connected with the anode of the diode D3; the positive electrode of the zener diode ZD3 is grounded;
the voltage dividing resistor R14 and the voltage dividing resistor R17 are connected in series between the output of the controllable silicon and the ground, wherein one end of the voltage dividing resistor R14 is connected with the output of the controllable silicon, the other end of the voltage dividing resistor R14 is connected in series with the voltage dividing resistor R17 at a potential reference point a, and the other end of the voltage dividing resistor R17 is grounded;
the positive electrode of the shunt regulator U2 is grounded, the negative electrode of the shunt regulator U2 is connected with the positive electrode of the diode D3, and the reference end of the shunt regulator U is connected with the potential reference point a.
Preferably, the silicon controlled rectifier dimming active bleeder circuit further comprises: a capacitor C12 and a resistor R16;
the capacitor C12 and the resistor R16 are connected between the grid electrode of the power MOS tube Q7 and the ground in parallel.
Preferably, the shunt regulator U2 is a TL431 adjustable precision shunt regulator.
Further preferably, the TL431 adjustable precision shunt regulator has an internal reference voltage of 2.5V.
Preferably, the silicon controlled rectifier dimming active bleeder circuit is connected into a power supply system;
the power supply system includes: the device comprises an electromagnetic interference EMI filter circuit, a bridge rectifier circuit, a silicon controlled rectifier dimming active bleeder circuit, a Pi filter circuit, a pulse width modulation PMW circuit, a power conversion circuit, a feedback circuit and an output circuit;
the electromagnetic interference EMI filter circuit is connected with an alternating current power supply, the bridge rectifier circuit is connected with the rear end of the electromagnetic interference EMI filter circuit, the silicon controlled rectifier is connected with the output end of the bridge rectifier circuit, and the silicon controlled rectifier dimming active bleeder circuit is connected with the output end of the silicon controlled rectifier;
the output end of the silicon controlled rectifier dimming active bleeder circuit is connected with the input end of the Pi filter circuit, the output end of the Pi filter circuit is connected with the input end of the power conversion circuit, and the output end of the power conversion circuit is connected with the output circuit;
the output end of the output circuit is also connected with the input end of the feedback circuit, the output end of the feedback circuit is connected with the input end of the pulse width modulation (PMW) circuit, and the output end of the pulse width modulation (PMW) circuit is connected with the feedback input end of the power conversion circuit.
Further preferably, a rear stage of the output circuit is connected to an LED.
The silicon controlled rectifier dimming active bleeder circuit provided by the embodiment of the utility model does not work when the silicon controlled rectifier is conducted at a large angle, so that the overall efficiency of a power supply is not affected; under the condition that the conduction angle of the silicon controlled rectifier is smaller, a bleeder circuit is used for providing a bleeder passage through the dimming active bleeder circuit of the silicon controlled rectifier, so that the current flowing through the silicon controlled rectifier is increased, the situation that the silicon controlled rectifier turns off in advance due to insufficient maintaining current under the condition of small-angle conduction of the silicon controlled rectifier is avoided, the situation that the LED connected with the silicon controlled rectifier flickers is avoided, namely, the situation that the maintaining current of the silicon controlled rectifier is insufficient is adjusted, and the effects of stable dimming and flicker inhibition of the LED lamp are realized; in addition, the voltage of the intervening dimming control can be flexibly set by adjusting the proportion of the voltage dividing resistor, so that the compatibility of the LED drive to the silicon controlled rectifier is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional thyristor;
FIG. 2 is a schematic diagram showing the effect of a thyristor phase-cut circuit;
fig. 3 is a schematic diagram of a thyristor dimming active bleeder circuit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a power supply system including a thyristor dimming active bleeder circuit according to an embodiment of the present utility model.
Detailed Description
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
In order to better understand the technical scheme of the embodiment of the utility model, the silicon controlled rectifier and the principle thereof are introduced and described.
Fig. 1 is a schematic structural diagram of a conventional thyristor, and fig. 2 is a schematic effect diagram of a thyristor phase-cut circuit. It can be seen that the Triac dimmer circuit is mainly composed of a Triac, a DIAC, resistors R1, R2 and a capacitor C1. In this circuit, the resistors R1 and R2 and the capacitor C1 form a delay circuit, which delays the conduction of the Triac, thereby determining the magnitude of the conduction angle of the Triac. The alternating current input by the alternating current power supply AC is subjected to Phase Cut (Phase Cut) through a controlled silicon, and the effect is shown in figure 2. By phase cutting the input sine wave, only part of the voltage can enter the circuit. The term "phase cut" refers to controlling the magnitude of the load current by varying the conduction time of the ac current by controlling the firing angle of the thyristor. In particular, the thyristors may conduct during certain alternating waveform periods of the current. The phase switching of the input current through the thyristor means that the load current in the circuit is controlled by controlling the on time of the thyristor. The method is a common alternating current control method and is a dimming mode of the LED lighting lamp.
The working principle of the silicon controlled rectifier dimmer is to change the average value of the input voltage of a circuit based on the charge and discharge time of a capacitor, so that the brightness of the LED lamp is adjusted. The specific working process is as follows:
1. the input sine wave is tangential: the phase-cut circuit performs tangential control on the input sine wave, and the working time of a load (such as an LED) in each alternating current period is controlled by delaying and triggering the conduction angle of the Triac.
2. The delay circuit influences the conduction angle: the conduction angle of the bidirectional thyristor can be influenced by a delay circuit formed by the resistors R1 and R2 and the capacitor C1. The charge-discharge time of the delay circuit determines when to trigger the conduction of the Triac and thus the energization time of the load in each ac cycle.
Therefore, the brightness of the lamp can be adjusted by adjusting the delay circuit. When the charging time of the delay circuit is relatively long, the Triac conduction angle is small, so that the load conduction time is short, the average power of the load is reduced, and the dimming effect is realized. On the contrary, when the charging time of the delay circuit is relatively short, the Triac conduction angle is large, the load conduction time is long, the average power of the load is increased, and higher brightness is realized.
Therefore, the silicon controlled rectifier dimming circuit utilizes a phase-cut control and delay circuit to adjust the brightness of a load (such as an LED) by adjusting the conduction angle, thereby providing the dimming function of lamplight.
The embodiment of the utility model provides a silicon controlled rectifier dimming active bleeder circuit, as shown in fig. 3, comprising: the power MOS transistor Q7, the bleeder resistor R15, the diode D3, the voltage stabilizing diode ZD3, the triode Q8, the current limiting resistor R13, the shunt regulator U2 and the voltage dividing resistors R14 and R17.
The power MOS tube Q7 is an NMOS tube, the drain electrode is connected with the output of the silicon controlled rectifier, and the source electrode is connected with the bleeder resistor R15 in series and grounded; when the power MOS transistor Q7 is turned on, active bleeder is formed through the bleeder resistor R15, so that the current flowing through the silicon controlled rectifier is increased in a complementary mode.
The anode of the diode D3 is connected with the current limiting resistor R13 and the power supply Vcc, and the cathode of the diode D3 is connected with the grid electrode of the power MOS tube Q7; the current limiting resistor R13 is used for limiting current through R13 when the power MOS transistor Q7 is turned on.
The triode Q8 is a PNP tube, the emitter is connected with the grid electrode of the power MOS tube Q7, the collector is grounded, the base is connected with the cathode of the zener diode ZD3, and the anode of the diode D3 is connected; the positive electrode of the zener diode ZD3 is grounded; q8 is used for turning off Q7 fast when power MOS pipe Q7 turns off.
The voltage dividing resistor R14 and the voltage dividing resistor R17 are connected in series between the output of the silicon controlled rectifier and the ground, wherein one end of the voltage dividing resistor R14 is connected with the output of the silicon controlled rectifier, the other end of the voltage dividing resistor R14 is connected in series with the voltage dividing resistor R17 at a potential reference point a, and the other end of the voltage dividing resistor R17 is grounded;
the positive electrode of the shunt voltage stabilizer U2 is grounded, the negative electrode of the shunt voltage stabilizer U2 is connected with the positive electrode of the diode D3, and the reference terminal is connected with the potential reference point a. Preferably, the shunt regulator U2 adopts a TL431 adjustable precision shunt regulator, and the internal reference voltage of the TL431 adjustable precision shunt regulator is 2.5V.
The silicon controlled rectifier dimming active bleeder circuit further comprises: a capacitor C12 and a resistor R16; the capacitor C12 and the resistor R16 are connected between the grid electrode of the power MOS tube Q7 and the ground in parallel.
The circuit realizes high-voltage protection and low-voltage stability guarantee of the circuit through the voltage dividing resistors R14 and R17 and the shunt regulator U2.
High voltage protection: the voltage is fed to the voltage regulator U2 (TL 431) for comparison through the voltage dividing resistors R14 and R17 to protect the circuit from the high voltage. When the input voltage is higher than the reference voltage (such as 2.5V) of the voltage regulator U2, the voltage regulator U2 outputs a low level, and the power MOS transistor Q7 is turned off, so that the problem of increasing the loss of the resistor R15 due to the conduction of the power MOS transistor Q7 when the input voltage is high is avoided.
Stability guarantee at low pressure: when the brightness of the LED is to be adjusted to be small, since the output power is small, the current flowing through the thyristor also decreases sharply, and at this time, the holding current of the thyristor may be insufficient to cause flickering of the LED. When the input voltage is sampled by R14 and R17 and the divided voltage of R17 is lower than the reference 2.5V in the voltage stabilizer U2, the output voltage of U2 is high, so that the power tube Q7 is opened, the bleeder resistor R15 is connected, and the current flowing through the silicon controlled rectifier is increased. The problem that the SCR is turned off in advance due to insufficient maintaining current when the conduction angle of the SCR is small is avoided, and LED flickering is avoided. Meanwhile, the voltage of the intervening dimming control can be flexibly set by adjusting the proportion of the voltage dividing resistor, so that the compatibility of the LED drive to the silicon controlled rectifier is improved.
Small angle conduction protection: the capacitor C12 and the resistor R16 are connected with the grid electrode of the power MOS tube Q7 in parallel, so that the grid electrode is prevented from being suspended through the resistor R16, and the problem of insufficient maintenance current when the silicon controlled rectifier is conducted at a small angle is solved, and stable conduction is ensured.
The silicon controlled rectifier dimming active bleeder circuit provided by the embodiment can realize the stability and reliability of the silicon controlled rectifier dimming. Through the control to the power MOS tube Q7, ensure that the power MOS tube Q7 can not switch on under the high voltage condition, keep the stability when LED low luminance simultaneously, avoid LED scintillation problem. The silicon controlled rectifier dimming active bleeder circuit of the embodiment can achieve stable, reliable and flicker-free dimming effects.
In the power supply system to which the silicon controlled rectifier dimming active bleeder circuit provided in this embodiment is connected, as shown in fig. 4, the power supply system includes:
an electromagnetic interference (EMI) filter circuit 1, a module for suppressing electromagnetic interference. It is generally used to filter out high frequency noise generated in the power supply circuit to avoid interference to other electronic devices;
a bridge rectifier circuit 2 for converting an ac voltage into a dc voltage; after bridge rectification, obtaining direct-current voltage in an M shape;
the thyristor 3, also called a scr, can control the partial period of current flowing through it, thus achieving control of the voltage;
the silicon controlled rectifier dimming active bleeder circuit 100 is a circuit provided by the embodiment of the utility model;
the Pi filter circuit is used for filtering high-frequency noise in the signal;
a pulse width modulation (PMW) circuit 5 for controlling the output voltage or current by adjusting the pulse width, and adjusting the operation mode of the power conversion module according to the feedback information to stabilize the output;
a power conversion circuit 6 for converting a desired output voltage and current, which may be embodied as a DC-DC converter or inverter;
the feedback circuit 7 is used for monitoring information such as output voltage, current and the like, helping to maintain stable output, and feeding back the acquired information to the control system for necessary adjustment;
and the output circuit 8 is connected with a load LED at the back of the output circuit 8, and provides current and voltage for the load LED.
The EMI filter circuit 1 is connected with an alternating current power supply, the bridge rectifier circuit is connected with the rear end of the EMI filter circuit 1, the silicon controlled rectifier 3 is connected with the output end of the bridge rectifier circuit 2, and the silicon controlled rectifier dimming active bleeder circuit 100 is connected with the output end of the silicon controlled rectifier 3;
the output end of the silicon controlled rectifier dimming active bleeder circuit 100 is connected with the input end of the Pi filter circuit 4, the output end of the Pi filter circuit 4 is connected with the input end of the power conversion circuit 6, and the output end of the power conversion circuit 6 is connected with the output circuit 8;
the output end of the output circuit 8 is also connected with the input end of the feedback circuit 7, the output end of the feedback circuit 7 is connected with the input end of the PMW circuit 5, and the output end of the PMW circuit 5 is connected with the feedback input end of the power conversion circuit 6. The rear stage of the output circuit 8 is connected to an LED.
The power input (AC) firstly enters the EMI filter circuit 1 and then rectifies the alternating voltage into the direct voltage with M-shaped waveform through the bridge rectifier circuit 2, the direct voltage is modulated into the active bleeder circuit 100 through the controllable silicon 3 and the controllable silicon, and then enters the power conversion circuit 6 through the Pi filter circuit 4 and finally outputs and drives the LED through the output circuit 8, wherein the feedback circuit 7 collects the output voltage and the output current and the like and then inputs the output voltage and the output current into the PWM circuit 5 so as to stabilize the output voltage or the output current.
The circuit of the embodiment can be applied to a single-stage PFC circuit.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (6)
1. A thyristor dimming active bleeder circuit, the thyristor dimming active bleeder circuit comprising: the power MOS tube Q7, the bleeder resistor R15, the diode D3, the voltage stabilizing diode ZD3, the triode Q8, the current limiting resistor R13, the shunt regulator U2, the voltage dividing resistors R14 and R17;
the power MOS tube Q7 is an NMOS tube, the drain electrode is connected with the output of the silicon controlled rectifier, and the source electrode is connected with the bleeder resistor R15 in series and grounded;
the anode of the diode D3 is connected with a current limiting resistor R13 and a power supply Vcc, and the cathode of the diode D3 is connected with the grid electrode of the power MOS tube Q7;
the triode Q8 is a PNP tube, the emitter is connected with the grid electrode of the power MOS tube Q7, the collector is grounded, the base is connected with the cathode of the zener diode ZD3, and the base is connected with the anode of the diode D3; the positive electrode of the zener diode ZD3 is grounded;
the voltage dividing resistor R14 and the voltage dividing resistor R17 are connected in series between the output of the controllable silicon and the ground, wherein one end of the voltage dividing resistor R14 is connected with the output of the controllable silicon, the other end of the voltage dividing resistor R14 is connected in series with the voltage dividing resistor R17 at a potential reference point a, and the other end of the voltage dividing resistor R17 is grounded;
the positive electrode of the shunt regulator U2 is grounded, the negative electrode of the shunt regulator U2 is connected with the positive electrode of the diode D3, and the reference end of the shunt regulator U is connected with the potential reference point a.
2. The thyristor dimming active bleeder circuit according to claim 1, further comprising: a capacitor C12 and a resistor R16;
the capacitor C12 and the resistor R16 are connected between the grid electrode of the power MOS tube Q7 and the ground in parallel.
3. The thyristor dimming active bleeder circuit according to claim 1, wherein the shunt regulator U2 is a TL431 adjustable precision shunt regulator.
4. A thyristor dimming active bleeder circuit according to claim 3, wherein the internal reference voltage of the TL431 adjustable precision shunt regulator is 2.5V.
5. The thyristor dimming active bleeder circuit according to claim 1, wherein the thyristor dimming active bleeder circuit is connected into a power supply system;
the power supply system includes: the device comprises an electromagnetic interference EMI filter circuit, a bridge rectifier circuit, a silicon controlled rectifier dimming active bleeder circuit, a Pi filter circuit, a pulse width modulation PMW circuit, a power conversion circuit, a feedback circuit and an output circuit;
the electromagnetic interference EMI filter circuit is connected with an alternating current power supply, the bridge rectifier circuit is connected with the rear end of the electromagnetic interference EMI filter circuit, the silicon controlled rectifier is connected with the output end of the bridge rectifier circuit, and the silicon controlled rectifier dimming active bleeder circuit is connected with the output end of the silicon controlled rectifier;
the output end of the silicon controlled rectifier dimming active bleeder circuit is connected with the input end of the Pi filter circuit, the output end of the Pi filter circuit is connected with the input end of the power conversion circuit, and the output end of the power conversion circuit is connected with the output circuit;
the output end of the output circuit is also connected with the input end of the feedback circuit, the output end of the feedback circuit is connected with the input end of the pulse width modulation (PMW) circuit, and the output end of the pulse width modulation (PMW) circuit is connected with the feedback input end of the power conversion circuit.
6. The thyristor dimming active bleeder circuit according to claim 5, wherein the post stage of the output circuit is connected to an LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322320419.2U CN220673978U (en) | 2023-08-25 | 2023-08-25 | Silicon controlled rectifier dimming active bleeder circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322320419.2U CN220673978U (en) | 2023-08-25 | 2023-08-25 | Silicon controlled rectifier dimming active bleeder circuit |
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| CN220673978U true CN220673978U (en) | 2024-03-26 |
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| CN202322320419.2U Active CN220673978U (en) | 2023-08-25 | 2023-08-25 | Silicon controlled rectifier dimming active bleeder circuit |
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| CN (1) | CN220673978U (en) |
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- 2023-08-25 CN CN202322320419.2U patent/CN220673978U/en active Active
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