CN107872912B - Control circuit/method, dimming control system and electronic equipment - Google Patents
Control circuit/method, dimming control system and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention provides a control circuit/method, a dimming control system and electronic equipment, wherein the control circuit comprises a signal generation unit, a dimming control unit and a dimming control unit, wherein the signal generation unit is used for generating a control signal so as to control the voltage of a third input end of a bleeder module; the control end of the voltage output unit is connected with the signal generation unit, the output end of the voltage output unit is connected with the third input end of the bleeder module, when the control signal is a high-level signal, the voltage output unit outputs a first reference voltage, and when the first reference voltage is larger than the voltage of the sampling module, the bleeder module is in a conducting state; when the control signal is a low level signal, the voltage output unit outputs a ground voltage, and the bleeder module is in a cut-off state. When the control signal is high level, the bleeder module is in a conducting state; when the control signal is in a low level, the bleeder module is in a cut-off state, so that the bleeder module is in the cut-off state for a part of time according to the frequency of the control signal in the whole working process, and power consumption is not generated, thereby reducing the power consumption of the bleeder module.
Description
Technical Field
The present invention relates to a control system and method, and more particularly, to a power consumption control circuit, a dimming control system/method, and an electronic device.
Background
Silicon Controlled Rectifier (SCR), which is a short term for a silicon controlled rectifier element, is a commonly used high-power semiconductor device, also called a thyristor, and one of the main functions is voltage and current stabilization. Silicon controlled dimmers are widely used, allowing people to control light more highly. The silicon controlled rectifier is very convenient to use, has better stability than a common incandescent lamp and has quick response. The device is unidirectional in conductivity, safe and reliable, and high in controllability, and only has a connection state and a disconnection state.
Due to the characteristics of the silicon controlled rectifier, a certain maintaining current is needed to maintain the on state after the silicon controlled rectifier is turned on. In the prior art, referring to fig. 1, when the bus voltage VBUS is greater than the voltage drop VLED of the LED string, the current ILed of the LED string starts to generate and gradually increases to the current IBleed set value of the bleeder circuit, and in this process, the bleeder circuit is always in a conductive state until the current ILed of the LED string is higher than the current IBleed set value of the bleeder circuit, and the bleeder circuit is turned off. In the prior art, when the LED is not in current, the bleeder circuit is always in a conducting state, and the power consumption is high.
Therefore, how to provide a control circuit/method, a dimming control system and an electronic device to solve the defects of the prior art that when the LED no current in the loop or the LED branch current is smaller than the set value of the bleeder circuit, the bleeder circuit is always in a conductive state, resulting in larger power consumption, etc., has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a control circuit/method, a dimming control system and an electronic device, which are used for solving the problem that the bleeder circuit is always in a conductive state when the LED no-current or the LED branch current in the circuit is smaller than the bleeder circuit set value in the prior art, resulting in larger power consumption.
To achieve the above and other related objects, an aspect of the present invention provides a control circuit applied to a dimming control system including a dimming module, a driving module, and a discharging module; one end of the dimming module is connected with a power supply, the other end of the dimming module is connected with a first input end of the discharging module, one end of the driving module is connected with a load, the other end of the driving module is grounded through a sampling module, a second input end of the discharging module is connected with the sampling module, and an output end of the discharging module is connected with the other end of the driving module; the control circuit includes: the signal generation unit is used for generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module; the control end of the voltage output unit is connected with the signal generation unit, the output end of the voltage output unit is connected with the third input end of the bleeder module, when the control signal is a high-level signal, the voltage output unit outputs a first reference voltage, and when the first reference voltage is larger than the voltage of the sampling module, the bleeder module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage, and the bleeder module is in a cut-off state.
In an embodiment of the invention, the voltage output unit includes a first input end, a second input end, a control end and an output end, the control end of the voltage output unit is connected to the signal generating unit, the first input end of the voltage output unit inputs the first reference voltage, the second input end of the voltage output unit is grounded, and the output end of the voltage output unit is connected to the third input end of the bleeder module.
In an embodiment of the invention, the voltage output unit includes a single pole double throw switch.
In an embodiment of the invention, the signal generating unit includes an oscillator, and the control signal is a square wave signal with a duty ratio generated by the oscillator.
In another aspect, the present invention provides a dimming control system, where the dimming control system includes a dimming module, a rectifying module, a load, a driving module, and a discharging module, an input end of the dimming module is connected to a power supply, an output end of the dimming module is connected to an input end of the rectifying module, an output end of the rectifying module is connected to one end of the load, another end of the load is connected to one end of the driving module, another end of the driving module is grounded through a sampling module, a first input end of the discharging module is connected to an output end of the dimming module through the rectifying module, a second input end of the discharging module is connected to the sampling module, and an output end of the discharging module is connected to another end of the driving module, where the dimming control system further includes: the signal generation module is used for generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module; the control end of the voltage output module is connected with the signal generation module, the output end of the voltage output module is connected with the third input end of the bleeder module, when the control signal is a high-level signal, the voltage output module outputs a first reference voltage, and when the first reference voltage is larger than the voltage of the sampling module, the bleeder module is in a conducting state; when the control signal is a low-level signal, the voltage output module outputs a ground voltage, and the bleeder module is in a cut-off state.
In an embodiment of the invention, the bleeder module includes a first amplifying unit, a first switch unit, and a first detecting unit; the first amplifying unit adopts a first operational amplifier, the first switching unit adopts a first MOS tube, and the first detecting unit adopts a first resistor; the sampling module adopts a sampling resistor; the positive input end of the first operational amplifier is connected with the output end of the voltage output module, the negative input end of the first operational amplifier is connected with the connection point of the driving module and the sampling resistor through the first resistor, the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the output end of the rectifying module, and the source electrode of the first MOS tube is connected with one end of the first resistor.
In an embodiment of the invention, the driving module includes a second amplifying unit and a second switching unit; the second amplifying unit adopts a second operational amplifier, and the second switching unit adopts a second MOS tube; the positive input end of the second operational amplifier receives a second reference voltage, the negative input end of the second operational amplifier is connected with the connection point of the sampling resistor and the source electrode of the second MOS tube, the output end of the second operational amplifier is connected with the grid electrode of the second MOS tube, and the drain electrode of the second MOS tube is connected with one end of the load.
In an embodiment of the invention, the voltage output module includes a first input end, a second input end, a control end and an output end, the control end of the voltage output module is connected with the signal generating module, the first input end of the voltage output module inputs the first reference voltage, the second input end of the voltage output module is grounded, and the output end of the voltage output module is connected with the third input end of the bleeder module.
In yet another aspect, the present invention provides an electronic device including the dimming control system.
The last aspect of the invention provides a control method which is applied to a dimming control system comprising a dimming module, a rectifying module, a load, a driving module and a discharging module; the utility model discloses a control method for a light source, including the module of adjusting luminance, the other end of adjusting luminance is connected the first input of module of releasing, the load is connected to the one end of drive module, the other end of drive module passes through a sampling module ground connection, the second input of module of releasing is connected sampling module, the output of module of releasing is connected the still other end of drive module, the control method includes: generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module; when the control signal is a high-level signal, outputting a first reference voltage, and when the first reference voltage is greater than the voltage of the sampling module, the discharging module is in a conducting state; when the control signal is a low level signal, a ground voltage is output, and the bleeder module is in a cut-off state.
As described above, the control circuit/method, the dimming control system and the electronic device of the present invention have the following beneficial effects:
The voltage output unit outputs a first reference voltage when the control signal is a high-level signal, and the voltage of the first reference voltage is greater than that of the sampling module, so that the bleeder module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage to enable the bleeder module to be in a cut-off state, so that the bleeder module is in the cut-off state according to the frequency of the control signal for a part of time in the whole working process, and power consumption is not generated, and the power consumption of the bleeder module is reduced.
Drawings
FIG. 1 is a schematic diagram of waveforms in the prior art;
FIG. 2 is a schematic diagram of a control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control circuit applied to a dimming control system according to an embodiment of the present invention;
FIG. 4 is a circuit diagram showing an implementation of the control circuit of the present invention;
FIG. 5 is a schematic diagram of a dimming control system according to an embodiment of the present invention;
fig. 6 shows a circuit diagram of an implementation of the dimming control system of the present invention;
FIG. 7 is a schematic diagram of waveforms corresponding to the dimming control system shown in FIG. 6;
fig. 8 is a flow chart of a control method according to an embodiment of the invention.
Description of element reference numerals
1000. Control circuit
1001. Dimming module
1002. Driving module
1003. Bleeder module
1004. Load(s)
1005. Sampling module
10001. Signal generating unit
10002. Voltage output unit
1. Dimming control system
11. Dimming module
12. Rectifying module
13. Load(s)
14. Bleeder module
15. Driving module
16. Sampling module
10. Control circuit
101. Signal generating unit
102. Voltage output unit
2. Dimming control system
21. Dimming module
22. Rectifying module
23. Load(s)
24. Bleeder module
25. Driving module
26. Sampling module
27. Signal generation module
28. Voltage output module
S41 to S44 steps
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Example 1
Referring to fig. 2, the present embodiment provides a control circuit 1000 applied to a dimming control system including a dimming module 1001, a driving module 1002 and a bleeding module 1003; one end of the dimming module 1001 is connected with a power supply (not shown), the other end of the dimming module 1001 is connected with a first input end 3a of the relief module 1003, one end of the driving module 1002 is connected with a load 1004, the other end of the driving module 1002 is grounded through a sampling module 1005, a second input end 3b of the relief module 1003 is connected with the sampling module 1005, and an output end 3d of the relief module 1003 is connected with the other end of the driving module 1002; the control circuit 1000 may include:
A signal generating unit 10001 for generating a control signal, which is a signal having a set frequency, for controlling the voltage of the third input terminal 3c of the bleeder module 1003;
The control end of the voltage output unit 10002 is connected with the signal generating unit 10001, the output end of the voltage output unit 10002 is connected with the third input end 3c of the bleeder module 1003, when the control signal is a high level signal, the voltage output unit 10002 outputs a first reference voltage, and when the first reference voltage is greater than the voltage of the sampling module 1005, the bleeder module 1003 is in a conducting state; when the control signal is a low level signal, the voltage output unit 10002 outputs a ground voltage, and the bleeder module 1003 is in an off state.
In one implementation, the sampling module 1005 may be implemented with resistors. The sampling module 1005 forms a voltage reflecting the load current situation by sampling the current flowing through the driving module 1002. The dimming module 1001 is a thyristor dimmer, which receives the current of the power supply, rectifies the current and outputs the rectified current to the dimming module 1001, and the frequency selection of the control signal is mainly related to the characteristics of the thyristor dimmer.
In the embodiment, a signal generating unit generates a high-low level signal with a set frequency, and when a control signal is the high level signal, a voltage output unit outputs a first reference voltage, and when the first reference voltage is greater than the voltage of a sampling module, a discharging module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage to enable the bleeder module to be in a cut-off state, so that the bleeder module is in the cut-off state according to the frequency of the control signal for a part of time in the whole working process, and power consumption is not generated, and the power consumption of the bleeder module is reduced.
Example two
Referring to fig. 3, a schematic diagram of a control circuit applied to a dimming control system in an embodiment is shown. The dimming control system 1 comprises a dimming module 11, a rectifying module 12, a load 13, a discharging module 14 and a driving module 15. Wherein, a power supply is connected to the input of module 11 of adjusting luminance, the output of module 11 of adjusting luminance is connected with the input of rectifier module 12, the output of rectifier module 12 is connected with the one end of load 13, the other end of load 13 is connected with the one end of drive module 15, the other end of drive module 15 passes through a sampling module 16 ground connection, the first input of module 14 of releasing passes through rectifier module 12 and connects the output of module 11 of adjusting luminance, sampling module is connected to the second input of module 14 of releasing, the output of module 14 of releasing connects the still other end of drive module 15.
In this embodiment, the load 13 may be an LED module or an LED string. The dimming module 11 may be a triac dimmer, for example, a leading edge phase cut triac dimmer or a trailing edge phase cut triac dimmer. Sampling module 16 may be implemented using resistors or sampling circuitry.
In the present embodiment, the control circuit 10 may include a signal generation unit 101 and a voltage output unit 102. The signal generating unit 101 is connected to the third input terminal of the bleeder module 14, and is configured to generate a control signal for controlling the voltage of the third input terminal of the bleeder module 14, where the control signal is a signal having a set frequency. When the control signal is a high level signal, the voltage output unit 102 outputs a first reference voltage, and when the first reference voltage is greater than the voltage of the sampling module, the bleeder module 14 is in a conductive state. When the control signal is a low level signal, the voltage output unit 102 outputs a ground voltage, and the bleeder module 14 is in an off state.
In this embodiment, the first reference voltage may be generated by an internal reference voltage source of the dimming control system.
In this embodiment, the signal generating unit 101 may include an oscillator, and the control signal may be a square wave signal of a duty ratio generated by the oscillator. Specifically, the frequency of the oscillator is related to the characteristics of the triac dimmer, and it is not significant that the triac dimmer cannot maintain a reliable on state because the frequency is too slow to be selected for further efficiency improvement or reduction of power consumption. According to the frequency of the existing common silicon controlled rectifier dimmer, about-100 kHz and about-50% of the suggested frequency can be selected.
In this embodiment, the voltage output unit 102 includes a first input end, a second input end, a control end and an output end, the control end of the voltage output unit 102 is connected to the signal generating unit 101, the first input end of the voltage output unit 102 inputs a first reference voltage, the second input end of the voltage output unit 102 is grounded, and the output end of the voltage output unit 102 is connected to the third input end of the bleeder module 14.
Preferably, referring to fig. 4, the voltage output unit 102 may include a single pole double throw switch. The control terminal of the single pole double throw switch is connected to the signal generating unit 101, a first input terminal of which may be used for connection to a first reference voltage, a second input terminal of which may be used for grounding, and an output terminal of which is connected to a third input terminal of the bleeder module 14.
As will be readily appreciated, when the control signal is a high level signal, the first input terminal of the single pole double throw switch will be connected to the first reference voltage, and the output terminal thereof corresponds to the voltage that will output the first reference voltage; when the control signal is a low level signal, the second input end of the single-pole double-throw switch is connected with the ground end, and the output end of the single-pole double-throw switch corresponds to the voltage of the output end, so that the control end of the single-pole double-throw switch is only controlled by the oscillator and is irrelevant to whether current exists on the load.
It should be noted that, since the response speed of the single pole double throw switch to the switching signal is far greater than the frequency of the oscillator, it is generally considered as an ideal switch, and therefore, the speed of responding to the switching signal may be considered as not affecting the selection of the frequency of the oscillator. In the embodiment, a signal generating unit generates a high-low level signal with a set frequency, and when a control signal is the high level signal, a voltage output unit outputs a first reference voltage, and when the first reference voltage is greater than the voltage of a sampling module, a discharging module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage to enable the bleeder module to be in a cut-off state, so that the bleeder module is in the cut-off state according to the frequency of the control signal for a part of time in the whole working process, and power consumption is not generated, and the power consumption of the bleeder module is reduced.
Example III
Referring to fig. 5, a schematic diagram of a dimming control system in an embodiment is shown. The dimming control system 2 includes a dimming module 21, a rectifying module 22, a load 23, a bleeding module 24, a driving module 25, a sampling module 26, a signal generating module 27, and a voltage output module 28. The input end of the dimming module 21 is connected with a power supply (not shown), the output end of the dimming module 21 is connected with the input end of the rectifying module 22, the output end of the rectifying module 22 is connected with one end of the load 23, the other end of the load 23 is connected with one end of the driving module 25, the other end of the driving module 25 is grounded through the sampling module 26, the first input end of the discharging module 24 is connected with the output end of the dimming module 21 through the rectifying module 22, the second input end of the discharging module 24 is connected with the sampling module 26, and the output end of the discharging module 24 is connected with the other end of the driving module 25. Wherein the signal generating module 27 is configured to generate a control signal, which is a signal with a set frequency, for controlling the voltage of the third input terminal of the voltage output module 28; when the control signal is a high level signal, the voltage output module 28 outputs a first reference voltage, and when the first reference voltage is greater than the voltage of the sampling module 26, the bleeder module 24 is in a conductive state. When the control signal is a low level signal, the voltage output module 28 outputs a ground voltage, and the bleeder module 24 is in an off state. When the control signal is a high level signal and when the first reference voltage is not greater than the voltage of the sampling module 26, the voltage output module 28 still outputs the first reference voltage, and at this time, the bleeder module 24 is in an off state.
The voltage output module 28 includes a first input end, a second input end, a control end and an output end, the control end of the voltage output module 28 is connected with the signal generating module 27, the first input end of the voltage output module 28 inputs a first reference voltage, the second input end of the voltage output module 28 is grounded, and the output end of the voltage output module 28 is connected with the third input end of the bleeder module 24.
As shown in fig. 6, in the present embodiment, the bleeder module includes a first amplifying unit, a first switching unit, and a first detecting unit. Specifically, the first amplifying unit may use a first operational amplifier A1, the first switching unit may use a first MOS transistor M1, and the first detecting unit may use a first resistor R1. Sampling module 26 may employ sampling resistor R2.
The positive input end of the first operational amplifier A1 is connected with the output end of the voltage output module 28, the negative input end of the first operational amplifier A1 is connected with the connection point of the driving module 25 and the sampling resistor R2 through the first resistor R1, the output end of the first operational amplifier A1 is connected with the grid G of the first MOS tube M1, the drain D of the first MOS tube is connected with the output end of the rectifying module (U1) 21, and the source S of the first MOS tube M1 is connected with one end of the first resistor R1.
The driving module 25 may include a second amplifying unit, a second switching unit. With continued reference to fig. 6, the second amplifying unit may employ a second operational amplifier A2, and the second switching unit may employ a second MOS transistor M2. The positive input end of the second operational amplifier A2 receives the second reference voltage VrefLed, the negative input end of the second operational amplifier A2 is connected with a connection point of the sampling resistor R2 and the source electrode S of the second MOS tube M2, the output end of the second operational amplifier A2 is connected with the grid electrode G of the second MOS tube M2, and the drain electrode D of the second MOS tube is connected with one end of the load.
In this embodiment, the sampling resistor R2 samples the current flowing through the second MOS transistor M2 to obtain a voltage, which can reflect the magnitude and the presence or absence of the current flowing through the load.
In connection with fig. 7, there are three phases of current change of the bleeder module throughout the process: in the first stage, when the rectified bus voltage VBUS is smaller than the load voltage drop VLED (i.e. before the point a), no current is in the load, and the bleeder module starts to operate normally, at this time, when the control signal is a high level signal, the voltage output module 28 outputs the first reference voltage Vrefbleed, the bleeder module is in a conducting state, and there is a current flowing through the bleeder module, and when the control signal is a low level signal, the voltage output module 28 outputs the ground voltage, and the bleeder module is in a blocking state, and no current flows through the bleeder module. In the second stage, when the bus voltage VBUS is greater than or equal to the load voltage drop VLED (i.e. after the point a and before the point B), the first reference voltage Vrefbleed is greater than the voltage across the sampling resistor R2, and when the control signal is a high-level signal, the voltage output module 28 outputs the first reference voltage, M1 is turned on, and the bleeder module 24 is in a turned-on state. In this state, since the bleeder module will bleed current to ensure that the scr dimmer is in the on state, when M1 is on, the current flowing through the bleeder module should be less than the current in the first stage; when the control signal is a low level signal, the voltage output module 28 outputs the ground voltage, M1 is turned off, and the bleed current drops to 0. In the third stage, as the load current gradually increases, that is, the voltage of the sampling resistor gradually increases, when the voltage across the sampling resistor R2 is greater than the first reference voltage Vrefbleed (after point B), although the voltage output module 28 outputs the first reference voltage when the control signal is a high level signal, and the voltage output module 28 outputs the ground voltage when the control signal is a low level signal, the control of the M1 receiving bus voltage is turned off, and the bleeder module will be in an off state until the next start.
In the embodiment, a signal generating unit generates a high-low level signal with a set frequency, and when a control signal is the high level signal, a voltage output unit outputs a first reference voltage, and when the first reference voltage is greater than the voltage of a sampling module, a discharging module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage to enable the bleeder module to be in a cut-off state, so that the bleeder module is in the cut-off state according to the frequency of the control signal for a part of time in the whole working process, and power consumption is not generated, and the power consumption of the bleeder module is reduced.
Example IV
The present embodiment provides an electronic device, which includes the dimming control system 2 of the third embodiment, and will not be described herein. It is easily understood that the electronic device may be an LED lamp.
The embodiment reduces the power consumption of the electronic equipment by reducing the power consumption of the bleeder module.
Example five
The present embodiment provides a control method applied to the control circuit in the first or second embodiment, or the dimming control system in the third embodiment. Referring to fig. 8, a flow chart of a control method in an embodiment is shown. As shown in fig. 8, the control method includes the steps of:
S41, generating a control signal. The control signal is a signal having a set frequency that can be used to control the voltage at the third input of the bleeder module.
S42, judging whether the control signal is a high level signal or not; if yes, executing S43; if not, then execution proceeds to S44,
And S43, outputting a first reference voltage when the control signal is a high-level signal, and when the first reference voltage is greater than the voltage of the sampling resistor, the bleeder module is in a conducting state.
And S44, outputting a ground voltage when the control signal is a low-level signal, wherein the bleeder module is in a cut-off state.
In the embodiment, a signal generating unit generates a high-low level signal with a set frequency, and when a control signal is the high level signal, a voltage output unit outputs a first reference voltage, and when the first reference voltage is greater than the voltage of a sampling module, a discharging module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage to enable the bleeder module to be in a cut-off state, so that the bleeder module is in the cut-off state according to the frequency of the control signal for a part of time in the whole working process, and power consumption is not generated, and the power consumption of the bleeder module is reduced.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A control circuit is applied to a dimming control system comprising a dimming module, a driving module and a discharging module;
One end of the dimming module is connected with a power supply, the other end of the dimming module is connected with a first input end of the discharging module, one end of the driving module is connected with a load, the other end of the driving module is grounded through a sampling module, a second input end of the discharging module is connected with the sampling module, and an output end of the discharging module is connected with the other end of the driving module; characterized in that the control circuit comprises:
The signal generation unit is used for generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module;
The control end of the voltage output unit is connected with the signal generation unit, the output end of the voltage output unit is connected with the third input end of the bleeder module, when the control signal is a high-level signal, the voltage output unit outputs a first reference voltage, and when the first reference voltage is larger than the voltage of the sampling module, the bleeder module is in a conducting state; when the control signal is a low-level signal, the voltage output unit outputs a ground voltage, and the bleeder module is in a cut-off state.
2. The control circuit of claim 1, wherein the voltage output unit includes a first input terminal, a second input terminal, a control terminal, and an output terminal, the control terminal of the voltage output unit is connected to the signal generating unit, the first input terminal of the voltage output unit inputs the first reference voltage, the second input terminal of the voltage output unit is grounded, and the output terminal of the voltage output unit is connected to the third input terminal of the bleeder module.
3. A control circuit according to claim 1 or 2, wherein the voltage output unit comprises a single pole double throw switch.
4. The control circuit of claim 1, wherein the signal generation unit comprises an oscillator, the control signal being a square wave signal of a duty cycle generated by the oscillator.
5. The utility model provides a dimming control system, dimming control system includes dimming module, rectifier module, load, drive module, bleeder module, a power supply is connected to dimming module's input, dimming module's output with rectifier module's input is connected, rectifier module's output with the one end of load is connected, the other end of load with drive module's one end is connected, drive module's the other end passes through a sampling module ground connection, bleeder module's first input passes through rectifier module connects dimming module's output, bleeder module's second input is connected sampling module, bleeder module's output is connected drive module's another end, its characterized in that, dimming control system still includes:
the signal generation module is used for generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module;
The control end of the voltage output module is connected with the signal generation module, the output end of the voltage output module is connected with the third input end of the bleeder module, when the control signal is a high-level signal, the voltage output module outputs a first reference voltage, and when the first reference voltage is larger than the voltage of the sampling module, the bleeder module is in a conducting state; when the control signal is a low-level signal, the voltage output module outputs a ground voltage, and the bleeder module is in a cut-off state.
6. The dimming control system of claim 5, wherein the bleed module comprises a first amplification unit, a first switch unit, a first detection unit; the first amplifying unit adopts a first operational amplifier, the first switching unit adopts a first MOS tube, and the first detecting unit adopts a first resistor; the sampling module adopts a sampling resistor;
The positive input end of the first operational amplifier is connected with the output end of the voltage output module, the negative input end of the first operational amplifier is connected with the connection point of the driving module and the sampling resistor through the first resistor, the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the output end of the rectifying module, and the source electrode of the first MOS tube is connected with one end of the first resistor.
7. The dimming control system of claim 6, wherein the driving module comprises a second amplifying unit, a second switching unit; the second amplifying unit adopts a second operational amplifier, and the second switching unit adopts a second MOS tube;
the positive input end of the second operational amplifier receives a second reference voltage, the negative input end of the second operational amplifier is connected with the connection point of the sampling resistor and the source electrode of the second MOS tube, the output end of the second operational amplifier is connected with the grid electrode of the second MOS tube, and the drain electrode of the second MOS tube is connected with one end of the load.
8. The dimming control system of claim 5, wherein the voltage output module comprises a first input terminal, a second input terminal, a control terminal, and an output terminal, the control terminal of the voltage output module is connected to the signal generating module, the first input terminal of the voltage output module inputs the first reference voltage, the second input terminal of the voltage output module is grounded, and the output terminal of the voltage output module is connected to the third input terminal of the bleeder module.
9. An electronic device, characterized in that: the electronic device comprising a dimming control system as claimed in any one of claims 5-8.
10. The control method is applied to a dimming control system comprising a dimming module, a rectifying module, a load, a driving module and a discharging module; the utility model provides a power supply is connected to the one end of module of adjusting luminance, adjust luminance the other end of module of adjusting luminance and connect the first input of module of releasing, the load is connected to the one end of drive module, the other end of drive module passes through a sampling module ground connection, the second input of module of releasing is connected sampling module, the output of module of releasing is connected the still other end of drive module, its characterized in that, the control method includes:
Generating a control signal, wherein the control signal is a signal with a set frequency and is used for controlling the voltage of the third input end of the bleeder module;
when the control signal is a high-level signal, outputting a first reference voltage, and when the first reference voltage is greater than the voltage of the sampling module, the discharging module is in a conducting state; when the control signal is a low level signal, a ground voltage is output, and the bleeder module is in a cut-off state.
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| CN201711256787.8A CN107872912B (en) | 2017-12-04 | 2017-12-04 | Control circuit/method, dimming control system and electronic equipment |
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| CN109445336B (en) * | 2018-10-30 | 2022-05-17 | 温州市麦特力克电器有限公司 | Switch control circuit and switch control system |
| CN112234812A (en) * | 2020-09-27 | 2021-01-15 | 杭州长川科技股份有限公司 | Bleeder circuit, energy storage circuit, semiconductor test system and bleeder method |
| CN113395807B (en) * | 2021-06-01 | 2022-11-29 | 广东科谷智能科技有限公司 | Dimming circuit, PCB and dimming power supply |
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| CN107046751A (en) * | 2017-05-27 | 2017-08-15 | 深圳市明微电子股份有限公司 | A kind of linear constant current LED drive circuit, driving chip and drive device |
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| JP5564239B2 (en) * | 2009-12-14 | 2014-07-30 | ミネベア株式会社 | LED drive circuit |
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