CN111556633A - Control circuit and lighting control system - Google Patents
Control circuit and lighting control system Download PDFInfo
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- CN111556633A CN111556633A CN202010455016.7A CN202010455016A CN111556633A CN 111556633 A CN111556633 A CN 111556633A CN 202010455016 A CN202010455016 A CN 202010455016A CN 111556633 A CN111556633 A CN 111556633A
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to a control circuit and a lighting control system. Wherein the control circuit comprises a signal processing unit and a jumper unit. The signal processing unit is used for carrying out inversion and/or level conversion processing on the input signal and outputting the input signal; the jumper unit is connected with the signal processing circuit in parallel and used for receiving and directly outputting the input signal. According to the invention, when the input voltage signal is not matched with the voltage required by the ballast, the signal processing unit is used for receiving the input signal and carrying out phase inversion and/or level conversion processing on the input signal so as to enable the input signal subjected to the phase inversion and/or level conversion processing to be suitable for the ballast, and when the input voltage signal is matched with the voltage required by the ballast, the input signal is directly provided for the ballast through the jumper circuit, so that the application range of a control circuit board comprising the control circuit is wider, and the need of changing the control circuit due to the use of different types of ballasts is avoided.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a control circuit and a lighting control system.
Background
In the field of traditional stage moving head lamps and other gas discharge bulb equipment application fields needing signal control, a lighting device is generally divided into a bulb, a ballast and a control circuit board. However, because the enabling modes and/or voltages required for starting the ballasts of various models are different, the corresponding control circuits are slightly different, so that the control circuit may need to be changed to continue normal use every time one type of ballast is replaced.
It can be appreciated that it is rather cumbersome to modify the control circuitry; and as the types of the ballast models become more, the corresponding matched control circuit boards are more and more diversified, and the probability of changing the control circuit is increased, so that a control circuit with wide universality needs to be designed.
Disclosure of Invention
Based on the control circuit and the lighting control system, the invention provides the control circuit and the lighting control system, which are used for improving the universality of the control circuit and avoiding the need of changing the control circuit due to the use of ballasts with different models.
An embodiment of the present invention provides a control circuit, including:
the signal processing unit is used for receiving an input signal, carrying out inversion and/or level conversion processing on the input signal and outputting the input signal;
and the jumper connection unit is connected with the signal processing circuit in parallel and is used for receiving and directly outputting the input signal.
In one embodiment, the signal processing unit comprises a first-stage inverting processing branch and a second-stage inverting processing branch which are connected in series, and the jumper unit comprises a first-stage jumper branch and a second-stage jumper branch which are connected in series;
wherein, first order antiphase is handled the branch road with first order jump connection branch road is parallelly connected, second level antiphase is handled the branch road with second level jump connection branch road is parallelly connected, and first order antiphase is handled the branch road with first order jump connection branch road not simultaneous access, second level antiphase is handled the branch road with second level jump connection branch road not simultaneous access.
In one embodiment, when the control circuit comprises the first-stage inverting processing branch and the second-stage inverting processing branch, the control circuit performs level conversion processing on the input signal and outputs the input signal;
the control circuit comprises the first-stage inverting processing branch and the second-stage jumper branch, or when the control circuit comprises the second-stage inverting processing branch and the first-stage jumper branch, inverting processing is carried out on the input signal through the control circuit and the input signal is output;
and when the control circuit comprises a first-stage jumper branch and a second-stage jumper branch, the control circuit receives and directly outputs the input signal.
In one embodiment, the first stage inverting processing branch comprises:
the control end of the first switch tube is electrically connected with the input node, the input end of the first switch tube is electrically connected with a first power supply, and the output end of the first switch tube is grounded;
a first resistor connected in series between the first power supply and the input node;
the second resistor is connected between the first power supply and the input end of the first switching tube in series;
the third resistor is connected between the input node and the control end of the first switching tube in series; and
and the fourth resistor is connected between the input node and the ground end in series.
In one embodiment, the second stage inverting processing branch comprises:
the control end of the second switching tube is electrically connected with the input end of the first switching tube, the input end of the second switching tube is electrically connected with a second power supply, and the output end of the second switching tube is grounded;
the fifth resistor is connected between the input end of the first switching tube and the control end of the second switching tube in series; and
and the sixth resistor is connected between the second power supply and the input end of the second switching tube in series.
In one embodiment, the first-stage jumper branch comprises a seventh resistor, and the seventh resistor is connected between the control end of the first switching tube and the control end of the second switching tube in series.
In one embodiment, the second-stage jumper branch comprises an eighth resistor, and the eighth resistor is connected in series between the control end of the second switch tube and the input end of the second switch tube.
In one embodiment, the first switch tube and the second switch tube are both N-type switch tubes.
In one embodiment, the first switch tube and the second switch tube are both triodes, or the first switch tube and the second switch tube are both CMOS tubes.
Based on the same inventive concept, an embodiment of the present invention further provides a lighting control system, including: the ballast comprises a main control circuit, a ballast and a control circuit connected between the main control circuit and the ballast in series;
wherein, the control circuit is the control circuit of any one of the above embodiments.
In one embodiment, the lighting control system includes a switch control module, a state feedback control module, and a dimming control module, the main control circuit is connected to the ballast through the switch control module, the state feedback control module, and the dimming control module, respectively, and the switch control module, the state feedback control module, and the dimming control module include one of the control circuits.
In one embodiment, the input signal in the switch control module is a switch signal generated by the main control circuit, and the switch control module further includes:
the circuit breaking protection unit is connected between the control circuit and the ballast in series and used for detecting the working current of the control circuit and the ballast and disconnecting the control circuit and the ballast when the working current exceeds a preset threshold; and
and the detection feedback unit is connected between the output end of the circuit breaking protection unit and the main control circuit in series, and is used for generating an error feedback signal according to the switching signal output by the circuit breaking protection unit and outputting the error feedback signal to the main control circuit.
In one embodiment, in the state feedback control module, the input signal is a state feedback signal output by the ballast;
the main control circuit is further configured to determine whether the control circuit normally operates according to the feedback signal and the error feedback signal, and determine an error type when the control circuit operates abnormally.
In one embodiment, the main control circuit is further configured to generate an alarm signal when it is determined that the control circuit is abnormal in operation;
the lighting control system further comprises an alarm device, wherein the alarm device is electrically connected with the main control circuit and used for generating sound and/or light alarm according to the warning signal.
In one embodiment, the main control circuit comprises a single chip microcomputer, a digital signal processing chip or a logic chip.
In summary, the embodiment of the invention provides a control circuit and a lighting control system. Wherein the control circuit comprises a signal processing unit and a jumper unit. The signal processing unit is used for receiving an input signal, carrying out inversion and/or level conversion processing on the input signal and outputting the input signal; the jumper unit is connected with the signal processing circuit in parallel and used for receiving and directly outputting the input signal. According to the invention, when the input voltage signal is not matched with the voltage required by the ballast, the signal processing unit is used for receiving the input signal and carrying out phase inversion and/or level conversion processing on the input signal so as to enable the input signal subjected to the phase inversion and/or level conversion processing to be suitable for the ballast, and when the input voltage signal is matched with the voltage required by the ballast, the input signal is directly provided for the ballast through the jumper circuit, so that the application range of a control circuit board comprising the control circuit is wider, and the need of changing the control circuit due to the use of different types of ballasts is avoided.
Drawings
Fig. 1 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control circuit design according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a lighting control system according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another lighting control system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a control circuit, which includes a signal processing unit 100 and a jumper unit 200.
The signal processing unit 100 is configured to receive an input signal, perform inversion and/or level conversion processing on the input signal, and output the processed input signal.
The jumper 200 is connected in parallel with the signal processing circuit, and is configured to receive and directly output the input signal.
It can be understood that, when an input signal does not match a voltage phase required by a load device connected at the rear end of the control circuit, the input signal may be subjected to an inversion process by the signal processing unit 100 and the inverted input signal may be provided to the load device. When the input signal does not match the voltage value of the voltage required by the load device connected to the rear end of the control circuit, the signal processing unit 100 may perform level conversion processing on the input signal so that the voltage of the input signal subjected to the level conversion processing reaches the voltage value required by the load device, and provide the input signal subjected to the level conversion processing to the load device. And when the voltage value and the phase of the input signal are not matched with those of the voltage required by the load equipment connected to the rear end of the control circuit, the input signal can be subjected to phase inversion and level conversion processing through the signal processing unit 100, and the processed input signal meets the requirement of the load equipment. And, when the input signal is phase-matched with a voltage required by a load device connected at the rear end of the control circuit, the input signal is received and directly output through the jumper unit 200. Therefore, the control circuit board comprising the control circuit has wider application range, thereby effectively solving the problem that the control circuit needs to be changed due to the use of ballasts with different models; in addition, the control circuit has universality, so that control circuit boards of various models do not need to be purchased, and the difficulty in material management can be reduced greatly. In addition, because the control circuit does not need to be changed, the problems of high cost, difficult design platformization and serialization and the like caused by low compatibility of the control circuit board and the ballast can be solved.
In one embodiment, the signal processing unit 100 includes a first stage inverting branch 110 and a second stage inverting branch 120 connected in series, and the jumper unit 200 includes a first stage jumper branch 210 and a second stage jumper branch 220 connected in series.
The first-stage inverting branch 110 is connected in parallel with the first-stage jumper branch 210, the second-stage inverting branch 120 is connected in parallel with the second-stage jumper branch 220, the first-stage inverting branch 110 is not connected with the first-stage jumper branch 210 at the same time, and the second-stage inverting branch 120 is not connected with the second-stage jumper branch 220 at the same time.
It can be understood that the control circuit has a first-stage inverting processing branch 110, a second-stage inverting processing branch 120, a first-stage jumper branch 210, and a second-stage jumper branch 220, and the control circuit can access the corresponding inverting processing branch and jumper branch according to actual needs, so as to implement inverting and/or level conversion processing on the input signal. Specifically, when the input signal needs to be inverted, the inversion can be realized only by the first-stage inversion processing branch 110 or the second-stage inversion processing branch 120. When only level conversion is needed, the first-stage inverting processing branch 110 may perform inversion, and then the second-stage inverting processing branch 120 may perform inversion and level conversion on the inverted input signal again, so that the input signal after two times of processing is suitable for the load device. If the input signal is suitable for the load equipment, the input signal is received and then directly provided for the load equipment through the jumper circuit without any processing.
In one embodiment, when the control circuit includes the first stage inverting processing branch 110 and the second stage inverting processing branch 120, the control circuit performs level conversion processing on the input signal and outputs the processed input signal.
When the control circuit includes the first-stage inverting processing branch 110 and the second-stage jumper branch 220, or includes the second-stage inverting processing branch 120 and the first-stage jumper branch 210, the control circuit performs inverting processing on the input signal and outputs the processed signal.
When the control circuit includes the first-stage jumper branch 210 and the second-stage jumper branch 220, the control circuit receives and directly outputs the input signal.
Referring to fig. 2, before the control circuit board including the control circuit is used to match the ballast, it is first determined whether the phase inversion processing is required, and if so, the first-stage phase inversion processing branch 110 is connected; otherwise, the first stage inverting processing branch 110 is cancelled and the first stage jumper branch 210 is accessed. Then, whether level conversion and phase inversion are needed is judged, if yes, the second-stage phase inversion processing branch 120 is accessed, and the second-stage jumper connection branch 220 is cancelled; otherwise, the second stage inverting processing branch 120 is cancelled and the second stage jumper branch 220 is accessed. After the circuit is welded according to actual needs, the output signal provided by the control circuit can meet the requirements of the ballast. For example, the voltage of the input signal is 3.3V, and the ballast requires a driving voltage of 5V, so that a voltage signal with a voltage of 5V can be output by switching in the first stage inverting processing branch 110 and the second stage inverting processing branch 120, and performing two times of inverting processing and one time of level conversion processing on the input signal through the first stage inverting processing branch 110 and the second stage inverting processing branch 120. For another example, if the voltage of the input signal is 3.3V and the ballast is enabled at low level, the input signal may be inverted by accessing the first-stage inverting processing branch 110 and the second-stage skipping branch 220, or the first-stage skipping branch 210 and the second-stage inverting processing branch 120, or the first-stage inverting processing branch 110, and then output to the ballast through the second-stage skipping branch 220 or directly. For another example, if the voltage of the input signal is 3.3V, and the ballast requires a driving voltage of 3.3V, that is, the input signal does not need to be processed, and the input signal can be used to drive the ballast only, and at this time, the input signal can be directly provided to the ballast by connecting the first stage jumper branch 210 and the second stage jumper branch 220.
In one embodiment, the first stage inverting processing branch 110 includes a first switch Q1, a first resistor, a second resistor, a third resistor, and a fourth resistor.
The control terminal of the first switch transistor Q1 is electrically connected to the input node, the input terminal of the first switch transistor Q1 is electrically connected to the first power supply, and the output terminal of the first switch transistor Q1 is grounded.
The first resistor R1 is connected in series between the first power supply and the input node P1.
The second resistor R2 is connected in series between the first power supply and the input terminal of the first switch tube Q1.
The third resistor R3 is connected in series between the input node P1 and the control terminal of the first switch tube Q1.
The fourth resistor R4 is connected in series between the input node P1 and ground.
In this embodiment, the input node P1 is an input terminal of the control circuit, the first power supply is a working voltage VDD of a control circuit board to which the control circuit belongs, the second power supply is an interface voltage VCC of a ballast, and the load device is the ballast. The first resistor R1 and the fourth resistor R4 are upper and lower bias resistors, and determine a default initial level, that is, the first resistor R1 and the fourth resistor R4 form a static operating point of the first switching tube Q1, so that the first switching tube Q1 can operate in an amplification region. In some other embodiments, the Q1 may not be switched in, but the input signal limited by the third resistor R3 is provided directly to the second inverting processing branch 120 through the switched-in first jumper branch 210. In addition, the fourth resistor R4 is not connected if pull-up is required, and the first resistor R1 is not connected if pull-down is required. When the first switch tube Q1 is connected, the input signal is provided to the first switch tube Q1 after being limited by the third resistor R3; and the phase-inverted signal is output after being processed by the first switching tube Q1. If the input signal is at a high level, the first switch tube Q1 is turned on, the input end of the first switch tube Q1 is grounded, and the input signal obtained after the phase inversion processing by the first switch tube Q1 is at a low level; if the input signal is low, the first switch Q1 is turned off, and the first switch Q1 outputs a high signal.
In one embodiment, the second stage inverting processing branch 120 includes a second switch Q2, a fifth resistor R5, and a sixth resistor R6.
The control terminal of the second switch transistor Q2 is electrically connected to the input terminal of the first switch transistor Q1, the input terminal of the second switch transistor Q2 is electrically connected to the second power supply, and the output terminal of the second switch transistor Q2 is grounded.
The fifth resistor R5 is connected in series between the input terminal of the first switch Q1 and the control terminal of the second switch Q2.
The sixth resistor R6 is connected in series between the second power supply and the input terminal of the second switch tube Q2.
In this embodiment, when the control terminal of the second switch Q2 is at a high level, the second switch Q2 is turned on, the input terminal of the second switch Q2 is grounded, and a low level signal is output to the ballast interface; when the control terminal of the second switching tube Q2 is at a low level, the second switching tube Q2 is turned off, and outputs a high level voltage VCC to the ballast interface.
Specifically, if the input signal needs to be converted from the VDD level to the VCC level for output, and the phase is not changed, the whole working loop includes: the output signal is subjected to current limiting through a third resistor R3, then is subjected to phase inversion processing through a first switch tube Q1, and outputs a voltage signal VDD, and then is provided to a control end of a second switch tube Q2 through a fifth resistor R5, the second switch tube Q2 is turned on, and is subjected to phase inversion and level conversion processing through a second switch tube Q2, so that a voltage signal VCC is provided for a ballast interface, and an input signal after level conversion is obtained, so that the requirement for driving the ballast is met. In this case, the first-stage jumper branch 210 and the second-stage jumper branch 220 are not connected.
If the input signal needs to be inverted and the level needs to be converted from VDD to VCC and then outputted, the whole working loop includes: the input signal is current-limited by the third resistor R3, then directly connected to the control end of the second switch through the first-stage jumper branch 210, and then subjected to inversion and level conversion by the second switch tube Q2 to provide a voltage signal VCC for the ballast interface, so as to obtain the inverted and level-converted input signal, thereby meeting the requirement for driving the ballast. In this case, the first switch Q1, the second resistor R2, the fifth resistor R5 and the second stage jumper branch 220 are not connected.
If the input signal can be output only after the inverted level is performed, the whole working loop comprises: the input signal is limited by the third resistor R3 and then connected to the control terminal of the first switch Q1, and after being inverted by the first switch Q1, the input signal is provided to the ballast through the fifth resistor R5 and the second stage jumper branch 220. In this case, the first-stage jumper branch 210, the second switch Q2 and the sixth resistor R6 are not connected.
If the input signal can be directly provided to the interface without processing, the whole working circuit comprises: the input signal is current-limited by the third resistor R3 and then directly output to the interface through the first-stage jumper connection branch 210 and the second-stage jumper connection branch 220, and the first switch tube Q1, the second switch tube Q2, the second resistor R2, the fifth resistor R5 and the sixth resistor R6 in the control circuit are not connected.
In one embodiment, the first stage jumper 210 includes a seventh resistor connected in series between the control terminal of the first switch transistor Q1 and the control terminal of the second switch transistor Q2. In this embodiment, the resistance of the seventh resistor may be selected according to actual requirements. In some embodiments, the seventh resistor may be a resistor with a resistance of 0 ohm, or may be a resistor with a certain resistance.
In one embodiment, the second-stage jumper branch 220 includes an eighth resistor connected in series between the control terminal of the second switch transistor Q2 and the input terminal of the second switch transistor Q2. The selection of the eighth resistor is similar to the selection process of the seventh resistor, and is not described herein again.
In one embodiment, the first switch tube Q1 and the second switch tube Q2 are both N-type switch tubes. It can be understood that when the first switch transistor Q1 and the second switch transistor Q2 are both N-type switch transistors, the circuit design is simplified. In some other embodiments, the first switch tube Q1 and the second switch tube Q2 are both P-type switch tubes; alternatively, the first switch tube Q1 and the second switch tube Q2 are different types of switch tubes, the type of switch tube should be selected according to the design of the designed circuit, and the embodiment does not limit the type of switch tube.
In one embodiment, the first switching tube Q1 and the second switching tube Q2 are both triodes, or the first switching tube Q1 and the second switching tube Q2 are both CMOS tubes. It can be understood that, when the first switching tube Q1 and the second switching tube Q2 are both triodes, or the first switching tube Q1 and the second switching tube Q2 are both CMOS tubes, it is beneficial to further simplify the circuit design.
Based on the same inventive concept, the embodiment of the present invention further provides a lighting control system, please refer to fig. 3, the lighting control system includes a main control circuit 10, a ballast 20, and a control circuit 30 connected in series between the main control circuit 10 and the ballast 20; the control circuit 30 is the control circuit 30 according to any of the above embodiments, and the control circuit 30 can perform inversion and/or level conversion processing on the input signal.
In this embodiment, by setting the control circuit 30, adaptation can be performed and equivalent effects can be achieved even when the connection mode, the initial level, the level voltage and the ballast level enable are not equivalent, and the control circuit has the characteristics of high applicability, high cooperativity and high stability, and can meet the control requirements of most ballasts 20 on the market at present, and equivalent control effects to those before replacement can be achieved only by slightly changing the welding elements of the control circuit 30 after replacing the ballasts 20, so that the problem that the control circuit 30 needs to be changed due to the use of ballasts 20 of different models can be effectively solved; in addition, because the control circuit 30 has universality, the matching between the main control circuit 10 and the ballast 20 can be realized through the control circuit 30, so that the main control circuits 10 of various models do not need to be purchased, and the difficulty in material management can be reduced. In addition, since the control circuit 30 does not need to be changed, the problems of high cost, unfavorable design of platform and serialization, and the like caused by low compatibility between the main control circuit 10 and the ballast 20 can be solved.
In one embodiment, the lighting control system includes a switch control module, a state feedback control module and a dimming control module, the main control circuit 10 is connected to the ballast 20 through the switch control module, the state feedback control module and the dimming control module, and the switch control module, the state feedback control module and the dimming control module include one control circuit 30.
It can be understood that the lighting control system includes three sets of circuits: the device comprises a switch control module, a state feedback control module and a dimming control module. The switching control module, the state feedback control module and the dimming control module include one of the control circuits 30, which is used to realize matching between the main control circuit 10 and the ballast 20.
In one embodiment, the main control circuit 10 includes a single chip, a digital signal processing chip, or a logic chip. The input signal may be a serial port signal, a level switching signal or a driving signal. In this embodiment, the main control circuit 10 is an MCU (micro controller Unit) intelligent chip, which may be a single chip, a digital signal processing chip, or a logic chip, and is configured to generate the input signal and provide the input signal to the control circuit 30.
In one embodiment, the input signal of the switch control module is a switch signal generated by the main control circuit 10, and the switch control module further includes a circuit breaking protection unit 300 and a detection feedback unit 400.
The open circuit protection unit 300 is connected in series between the control circuit 30 and the ballast 20, and is configured to detect an operating current between the control circuit 30 and the ballast 20, and to disconnect the control circuit 30 from the ballast 20 when the operating current exceeds a preset threshold.
The detection feedback unit 400 is connected in series between the output terminal of the circuit breaking protection unit 300 and the main control circuit 10, and is configured to generate an error feedback signal according to the switching signal output by the circuit breaking protection unit 300, and output the error feedback signal to the main control circuit 10.
Referring to fig. 4, fig. 4 is a corresponding circuit diagram of a practical application of the switch control module, wherein the right side of the vertical dashed line is a simplified circuit diagram of signal control inside ballast 20. In the switch control module, the input signal is a switch signal generated by the main control circuit 10. There are two connection modes of the internal control circuit of the ballast 20 to the ballast control interface, and the enabling modes corresponding to the two connection modes are completely opposite, as shown in fig. 4; the first connection mode is a low-level enable connection, and the second connection mode is a high-level enable connection. Only one connection mode can exist in each control circuit in each type of ballast, and the connection mode is variable according to manufacturers, so that a high-pass and widely-adaptive signal control circuit is more needed to correspond to the connection mode.
The working principle of the switch control module specifically comprises the following steps:
if the switching signal needs to be converted from the VDD level to the VCC level for output, the switching signal is subjected to current limiting by the third resistor R3, then subjected to phase inversion processing by the first switching tube Q1, and subjected to phase inversion level conversion from the fifth resistor R5 to the second switching tube Q2, so as to obtain the switching signal subjected to forward and level conversion.
If the switching signal needs to be inverted and the level needs to be converted from VDD to VCC and then output, the switching signal is limited by the third resistor R3, then directly connected to the second switching tube Q2 through the R7, and then output after being inverted and level-converted by the second switching tube Q2.
If the switching signal can be output only after being subjected to phase inversion processing, the switching signal is subjected to phase inversion processing by the first switching tube Q1 after being subjected to current limiting by the third resistor R3, and is directly output to the interface through the eighth resistor after passing through the fifth resistor R5.
If the switching signal does not need to be processed and can be directly provided to the ballast 20, the switching signal is limited by the third resistor R3 and then directly output to the interface through the seventh resistor and the eighth resistor, and the first switch tube Q1, the second switch tube Q2, the second resistor R2, the fifth resistor R5 and the sixth resistor R6 in the circuit are not connected.
Further, the detection feedback unit 400 detects that the switching signal operates once when the switching circuit at the front end operates normally, generates an error feedback signal according to the switching signal output by the control circuit 30, and outputs the error feedback signal to the MCU; that is, each time the MCU outputs a switching signal level switch, an erroneous feedback signal will also be input to a level switch under normal conditions to confirm whether the switching circuit is working normally.
Further, by providing the disconnection protection unit 300, the connection between the control circuit 30 and the ballast 20 can be disconnected when the operating current exceeds a preset threshold, and the lighting control system can be prevented from being burned out due to excessive instantaneous current or overheating of the lamp.
In one embodiment, in the state feedback control module, the input signal is a state feedback signal output by the ballast 20; the main control circuit 10 is further configured to determine whether the control circuit 30 normally operates according to the feedback signal and the error feedback signal, and determine an error type when the control circuit 30 operates abnormally.
Specifically, please refer to fig. 2 again, after the switching signal is output, when the error feedback signal in the switching control module is not fed back, the error type is determined to be the switching signal error; after the switching signal is output, if the error feedback signal has feedback but the state feedback signal has no feedback, the error type is judged to be the error of the ballast 20; and after the switching signal is output, if both the error feedback signal and the state feedback signal have feedback, the switching control module is judged to work normally.
In one embodiment, the main control circuit 10 is further configured to generate an alarm signal when it is determined that the control circuit 30 is out of operation; the lighting control system further comprises an alarm device which is electrically connected with the main control circuit 10 and used for generating sound and/or light alarm according to the warning signal.
It can be understood that the judgment is finished and then a process that the MCU feeds back to the outside to remind the error is carried out, and the corresponding state can be displayed through an external indicating lamp, the buzzer reminds the corresponding error, and the display module displays the corresponding error state, so that the detection and the error correction are conveniently reminded.
In one embodiment, the circuit interrupting protection unit 300 includes a circuit interrupting protector F1, the circuit interrupting protector F1 is connected in series between the control circuit 30 and the ballast 20. In this embodiment, the control circuit is mostly applicable to lamps, and the circuit breaker can be an overheat protector because of large heat productivity of the lamps; in order to avoid the ignition control system from being burned out due to excessive instantaneous current, the disconnection protector may be a current protector, and the present embodiment does not limit the specific type of the disconnection protector F1.
In one embodiment, the detection feedback unit 400 includes a diode D1, a ninth resistor R9, a tenth resistor R10, and a third switching tube Q3.
The control end of the third switching tube Q3 is electrically connected with the output end of the circuit breaker F1, the input end of the third switching tube Q3 is electrically connected with the second power supply, and the input end of the third switching tube Q3 is grounded. The diode D1 is connected in series between the control terminal of the third switch tube Q3 and the output terminal of the circuit breaker F1, the ninth resistor R9 is connected in series between the negative electrode of the diode D1 and the control terminal of the third switch tube Q3, and the tenth resistor R10 is connected in series between the first power supply and the input terminal of the third switch tube Q3.
It is understood that ballast 20 is connected differently, ballast 20 is enabled differently, and ballast 20 may be enabled at a high level or a low level. In this embodiment, the ballast 20 is enabled at a low level, if the switching signal is normal (assuming that the switching signal is a square wave signal), when the switching signal is at a low level, the ballast 20 is triggered, at this time, the diode D1 is turned off, the third switching tube Q3 is turned off, and a high-level error switching feedback signal is output; when the switching signal is at a high level, the diode D1 and the third switching tube Q3 are turned on, the input end of the third switching tube Q3 is grounded, and a low-level error switching feedback signal is output, that is, when the switching signal is normal, an error feedback signal in a square wave shape is generated. If the switching signal is abnormal, for example, the switching signal is constantly high/low, an error feedback signal of constantly low/high level is generated. Therefore, when an erroneous feedback signal of a constant low/high level is detected, it is considered that the erroneous feedback signal is not fed back, and it is determined that the switching signal is erroneous.
In one embodiment, in the state feedback module control module, the input signal is a state feedback signal output by the ballast 20, voltages of the first power supply and the second power supply in the state feedback module control module are both VDD, and the state feedback signal with the level of VDD is provided to the main control circuit 10 by controlling a current, so that a pin of the MCU chip is protected, and the state feedback signal is prevented from being directly input to the MCU chip. The specific working principle and access mode are not described in detail at this time.
In summary, the present invention provides a control circuit 30 and a lighting control system. Compared with the existing control circuit 30, the control circuit 30 of the present invention has the following advantages: high adaptability, adapting to the control requirements of most ballasts 20; high stability, and has functions of inversion, level conversion, protection and error feedback; high cooperativity, after replacing the ballast 20, the control effect equivalent to that before replacement can be achieved by only slightly changing the welding elements of the control circuit 30, and the same main board can be used for controlling different types of ballasts 20, thereby avoiding the need of changing the control circuit 30 due to the use of different types of ballasts 20.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A control circuit, comprising:
the signal processing unit is used for receiving an input signal, carrying out inversion and/or level conversion processing on the input signal and outputting the input signal;
and the jumper connection unit is connected with the signal processing circuit in parallel and is used for receiving and directly outputting the input signal.
2. The control circuit of claim 1, wherein the signal processing unit comprises a first stage inverting processing branch and a second stage inverting processing branch connected in series, and the jumper unit comprises a first stage jumper branch and a second stage jumper branch connected in series;
wherein, first order antiphase is handled the branch road with first order jump connection branch road is parallelly connected, second level antiphase is handled the branch road with second level jump connection branch road is parallelly connected, and first order antiphase is handled the branch road with first order jump connection branch road not simultaneous access, second level antiphase is handled the branch road with second level jump connection branch road not simultaneous access.
3. The control circuit of claim 2,
when the control circuit comprises the first-stage inverting processing branch and the second-stage inverting processing branch, the control circuit is used for realizing level conversion processing on the input signal and outputting the input signal;
the control circuit comprises the first-stage inverting processing branch and the second-stage jumper branch, or when the control circuit comprises the second-stage inverting processing branch and the first-stage jumper branch, inverting processing is carried out on the input signal through the control circuit and the input signal is output;
and when the control circuit comprises a first-stage jumper branch and a second-stage jumper branch, the control circuit receives and directly outputs the input signal.
4. A control circuit according to claim 2 or 3, wherein the first stage inverting processing branch comprises:
the control end of the first switch tube is electrically connected with the input node, the input end of the first switch tube is electrically connected with a first power supply, and the output end of the first switch tube is grounded;
a first resistor connected in series between the first power supply and the input node;
the second resistor is connected between the first power supply and the input end of the first switching tube in series;
the third resistor is connected between the input node and the control end of the first switching tube in series; and
and the fourth resistor is connected between the input node and the ground end in series.
5. The control circuit of claim 4 wherein said second stage inverting processing branch comprises:
the control end of the second switching tube is electrically connected with the input end of the first switching tube, the input end of the second switching tube is electrically connected with a second power supply, and the output end of the second switching tube is grounded;
the fifth resistor is connected between the input end of the first switching tube and the control end of the second switching tube in series; and
and the sixth resistor is connected between the second power supply and the input end of the second switching tube in series.
6. The control circuit of claim 5, wherein the first stage jumper branch comprises a seventh resistor connected in series between the control terminal of the first switch tube and the control terminal of the second switch tube.
7. The control circuit of claim 5, wherein the second stage jumper branch comprises an eighth resistor connected in series between the control terminal of the second switch tube and the input terminal of the second switch tube.
8. The control circuit according to any one of claims 5-7, wherein the first switch tube and the second switch tube are both N-type switch tubes.
9. The control circuit according to any one of claims 5 to 7, wherein the first switching tube and the second switching tube are both transistors, or the first switching tube and the second switching tube are both CMOS tubes.
10. A lighting control system, comprising: the ballast comprises a main control circuit, a ballast and a control circuit connected between the main control circuit and the ballast in series;
wherein the control circuit is as claimed in any one of claims 1-9.
11. The lighting control system of claim 10, wherein the lighting control system includes a switch control module, a state feedback control module, and a dimming control module, the main control circuit is connected to the ballast through the switch control module, the state feedback control module, and the dimming control module, respectively, and the switch control module, the state feedback control module, and the dimming control module each include one of the control circuits.
12. The lighting control system of claim 11 wherein the input signal in the switch control module is a switch signal generated by the master control circuit, the switch control module further comprising:
the circuit breaking protection unit is connected between the control circuit and the ballast in series and used for detecting the working current of the control circuit and the ballast and disconnecting the control circuit and the ballast when the working current exceeds a preset threshold; and
and the detection feedback unit is connected between the output end of the circuit breaking protection unit and the main control circuit in series, and is used for generating an error feedback signal according to the switching signal output by the circuit breaking protection unit and outputting the error feedback signal to the main control circuit.
13. The lighting control system of claim 12 wherein in the state feedback control module, the input signal is a state feedback signal output by the ballast;
the main control circuit is further configured to determine whether the control circuit normally operates according to the feedback signal and the error feedback signal, and determine an error type when the control circuit operates abnormally.
14. The lighting control system of claim 13 wherein the main control circuit is further configured to generate an alarm signal when it is determined that the control circuit is malfunctioning;
the lighting control system further comprises an alarm device, wherein the alarm device is electrically connected with the main control circuit and used for generating sound and/or light alarm according to the warning signal.
15. The lighting control system of claim 11 wherein the master control circuit comprises a single chip, a digital signal processing chip, or a logic chip.
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| CN111556633B (en) | 2023-05-05 |
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