CN111556633B - Control circuit and lighting control system - Google Patents
Control circuit and lighting control system Download PDFInfo
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- CN111556633B CN111556633B CN202010455016.7A CN202010455016A CN111556633B CN 111556633 B CN111556633 B CN 111556633B CN 202010455016 A CN202010455016 A CN 202010455016A CN 111556633 B CN111556633 B CN 111556633B
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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 present invention relates to a control circuit and a lighting control system. The control circuit comprises a signal processing unit and a jumper connection 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 is used for receiving and directly outputting the input signal. In the invention, when the input voltage signal is not matched with the voltage required by the ballast, the signal processing unit can be used for receiving the input signal, carrying out inversion and/or level conversion processing on the input signal so as to enable the input signal after the 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, directly providing the input signal to 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 ballasts of different models is avoided.
Description
Technical Field
The present invention relates to the field of integrated circuits, and more particularly, to a control circuit and a lighting control system.
Background
In the field of traditional stage moving head lamps and other application fields of gas discharge bulb equipment needing signal control, lighting devices are generally divided into bulbs, ballasts and control circuit boards. However, because the enabling modes and/or the voltages required for starting the ballasts of various types are different, the corresponding control circuits are slightly different, so that the control circuits can be changed for normal use after each ballast is replaced.
It will be appreciated that changing the control circuit is rather cumbersome; and along with the increase of the types of ballasts, the corresponding matched control circuit boards are more and more various, and the probability of changing the control circuit is increased, so that a control circuit with wide universality is necessary to be designed.
Disclosure of Invention
Based on the above, the invention provides a control circuit and a 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 of different types.
The embodiment of the invention provides a control circuit, which comprises:
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 reverse phase processing branch and a second-stage reverse phase 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;
the first-stage reverse phase processing branch is connected with the first-stage jumper branch in parallel, the second-stage reverse phase processing branch is connected with the second-stage jumper branch in parallel, the first-stage reverse phase processing branch is not connected with the first-stage jumper branch at the same time, and the second-stage reverse phase processing branch is connected with the second-stage jumper branch at the same time.
In one embodiment, when the control circuit includes 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;
when the control circuit comprises the first-stage reverse phase processing branch and the second-stage jump-connection branch or comprises the second-stage reverse phase processing branch and the first-stage jump-connection branch, the control circuit realizes reverse phase processing on the input signal and outputs the input signal;
when the control circuit comprises a first-stage jumper branch and a second-stage jumper branch, the input signal is received and directly output through the control circuit.
In one embodiment, the first stage inverting processing branch includes:
the control end of the first switching tube is electrically connected with the input node, the input end of the first switching tube is electrically connected with the first power supply, and the output end of the first switching tube is grounded;
a first resistor connected in series between the first power supply and the input node;
the second resistor is connected in series between the first power supply and the input end of the first switching tube;
the third resistor is connected in series between the input node and the control end of the first switching tube; and
and the fourth resistor is connected in series between the input node and the ground terminal.
In one embodiment, the second stage inverting processing branch includes:
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 in series between the input end of the first switching tube and the control end of the second switching tube; and
and the sixth resistor is connected in series between the second power supply and the input end of the second switching tube.
In one embodiment, the first-stage jumper branch circuit includes a seventh resistor connected in series between the control end of the first switching tube and the control end of the second switching tube.
In one embodiment, the second-stage jumper branch circuit includes an eighth resistor connected in series between the control end of the second switching tube and the input end of the second switching tube.
In one embodiment, the first switching tube and the second switching tube are both N-type switching tubes.
In one embodiment, the first switching tube and the second switching tube are all triodes, or the first switching tube and the second switching tube are all CMOS tubes.
Based on the same inventive concept, the embodiment of the invention also provides a lighting control system, which comprises: a master control circuit, a ballast and a control circuit connected in series between the master control circuit and the ballast;
the control circuit is any one of the control circuits described in the foregoing embodiments.
In one embodiment, the lighting control system includes a switch control module, a state feedback control module, and a dimming control module, where the main control circuit is connected to the ballast 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 each include one control circuit.
In one embodiment, the input signal in the switch control module is a switch signal generated by the master control circuit, and the switch control module further includes:
the circuit breaking protection unit is connected in series between the control circuit and the ballast and is used for detecting the working current of the control circuit and the ballast and disconnecting the control circuit from the ballast when the working current exceeds a preset threshold value; and
the detection feedback unit is connected in series between the output end of the circuit breaking protection unit and the main control circuit, 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 also used for judging whether the control circuit works normally or not according to the feedback signal and the error feedback signal, and judging the error type when the control circuit works abnormally.
In one embodiment, the main control circuit is further used for generating an alarm signal when the control circuit is judged to work abnormally;
the lighting control system further comprises an alarm device, wherein the alarm device is electrically connected with the main control circuit and is used for generating sound and/or lamplight alarm according to the alarm signal.
In one embodiment, the master 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. The control circuit comprises a signal processing unit and a jumper connection 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 is used for receiving and directly outputting the input signal. In the invention, when the input voltage signal is not matched with the voltage required by the ballast, the signal processing unit can be used for receiving the input signal, carrying out inversion and/or level conversion processing on the input signal so as to enable the input signal after the 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, directly providing the input signal to 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 ballasts of different models 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 that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
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 input signal.
The jumper unit 200 is connected in parallel with the signal processing circuit and is configured to receive and directly output the input signal.
It will be appreciated that when the input signal does not match the voltage phase required by the load device connected to 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 supplied 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 a level conversion process on the input signal so that the voltage of the input signal after the level conversion process reaches the voltage value required by the load device, and supply the input signal after the level conversion process to the load device. And, when the input signal is not matched with the voltage value and the phase of the voltage required by the load device connected to the rear end of the control circuit, the signal processing unit 100 can perform inversion and level conversion processing on the input signal, and the processed input signal meets the requirement of the load device. And, when the input signal is phase-matched with a voltage required by a load device connected to 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 various types of control circuit boards do not need to be purchased, and the difficulty of material management can be reduced. In addition, because the control circuit does not need to be changed, the problems of high cost, adverse 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 processing branch 110 and a second stage inverting processing 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 processing branch 110 is connected in parallel with the first-stage jumper branch 210, the second-stage inverting processing branch 120 is connected in parallel with the second-stage jumper branch 220, the first-stage inverting processing branch 110 and the first-stage jumper branch 210 are not connected in parallel, and the second-stage inverting processing branch 120 and the second-stage jumper branch 220 are not connected in parallel.
It can be understood that the control circuit includes 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 be connected to the corresponding inverting processing branch and jumper branch according to actual needs, so as to perform inverting and/or level conversion processing on the input signal. Specifically, when the input signal needs to be subjected to the inversion processing, the inversion processing can be implemented only through the first stage inversion processing branch 110 or the second stage inversion processing branch 120. When only level conversion is needed, the first-stage inversion processing branch 110 can be used for implementing inversion, and then the second-stage inversion processing branch 120 is used for performing inversion and level conversion processing on the inverted input signal again, so that the input signal after two times of processing is suitable for load equipment. If the input signal is suitable for the load equipment, no processing is needed, and the input signal is directly provided for the load equipment through the jumper connection circuit after being received.
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 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 input signal.
When the control circuit includes the first-stage jumper branch 210 and the second-stage jumper branch 220, the input signal is received and directly output through the control circuit.
Referring to fig. 2, before matching the ballast with the control circuit board including the control circuit, it is first determined whether an inversion process is required, if so, the first stage inversion processing branch 110 is connected; otherwise, the first-stage inverting processing branch 110 is canceled and the first-stage jumper branch 210 is accessed. Then, judging whether level conversion and inversion are needed, if so, accessing the second-stage inversion processing branch 120, and canceling the second-stage jumper branch 220; 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 the input signal can be subjected to two inverting processes and one level shift process through the first and second inverting process branches 110 and 120 by switching in the first and second inverting process branches 110 and 120, and the voltage signal of 5V can be output. 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 connecting the first-stage inverting branch 110 and the second-stage jumper branch 220, or connecting the first-stage jumper branch 210 and the second-stage inverting branch 120, or connecting the first-stage inverting branch 110, and then output to the ballast directly or through the second-stage jumper branch 220. For another example, if the voltage of the input signal is 3.3V, and the ballast needs a driving voltage of 3.3V, that is, no processing is needed on the input signal, the input signal may be used only for driving the ballast, and the input signal may 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 switching tube Q1, a first resistor, a second resistor, a third resistor, and a fourth resistor.
The control end of the first switching tube Q1 is electrically connected with the input node, the input end of the first switching tube Q1 is electrically connected with the first power supply, and the output end of the first switching tube 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 end of the first switching tube Q1.
The third resistor R3 is connected in series between the input node P1 and the control end of the first switching 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 end 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 the 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, a static working point of the first switching tube Q1 is formed by the first resistor R1 and the fourth resistor R4, so that the first switching tube Q1 can work in an amplifying region. In other embodiments, Q1 may not be switched in, but the input signal limited by the third resistor R3 is directly provided to the second inverting processing branch 120 through the switched 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 switching tube Q1 is connected, an input signal is provided for the first switching tube Q1 after being limited by the third resistor R3; and outputting after the first switching tube Q1 is subjected to reverse phase treatment. If the input signal is at a high level, the first switching tube Q1 is conducted, the input end of the first switching tube Q1 is grounded, and the input signal obtained after the inversion processing of the first switching tube Q1 is at a low level; if the input signal is at a low level, the first switching transistor Q1 is turned off, and the first switching transistor Q1 outputs a high level signal.
In one embodiment, the second stage inverting processing branch 120 includes a second switching tube Q2, a fifth resistor R5, and a sixth resistor R6.
The control end of the second switching tube Q2 is electrically connected with the input end of the first switching tube Q1, the input end of the second switching tube Q2 is electrically connected with a second power supply, and the output end of the second switching tube Q2 is grounded.
The fifth resistor R5 is connected in series between the input end of the first switching tube Q1 and the control end of the second switching tube Q2.
The sixth resistor R6 is connected in series between the second power supply and the input terminal of the second switching tube Q2.
In this embodiment, when the control end of the second switching tube Q2 is at a high level, the second switching tube Q2 is turned on, the input end of the second switching tube Q2 is grounded, and a low level signal is output to the ballast interface; when the control end of the second switching tube Q2 is at a low level, the second switching tube Q2 is cut off, and a high level voltage VCC is output to the ballast interface.
Specifically, if the input signal needs to be converted from VDD level to VCC level for output, and the phase is unchanged, the whole working loop includes: the output signal is subjected to reverse phase processing through the first switching tube Q1 after being limited by the third resistor R3, the output voltage signal VDD is provided to the control end of the second switching tube Q2 through the fifth resistor R5, the second switching tube Q2 is opened, reverse phase and level conversion processing is performed through the second switching tube Q2, the voltage signal VCC is provided for the ballast interface, and the input signal after the level conversion is obtained so as to meet the requirement of driving the ballast. 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 is to be converted from VDD to VCC and then output, the whole working loop includes: the input signal is directly connected to the control end of the second switch through the first-stage jumper branch 210 after being limited by the third resistor R3, and then is subjected to inversion and level conversion processing through the second switching tube Q2, so that a voltage signal VCC is provided for a ballast interface, and the input signal after inversion and level conversion is obtained, so that the requirement on driving of the ballast is met. In this case, the first switching tube 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 inversion level is performed, the whole working loop comprises: the input signal is connected to the control end of the first switching tube Q1 after being limited by the third resistor R3, is subjected to the reverse phase treatment by the first switching tube Q1, and 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 switching tube Q2, and the sixth resistor R6 are not connected.
If the input signal is directly provided to the interface without being processed, the whole working loop comprises: the input signal is limited by the third resistor R3 and then directly output to the interface through the first-stage jumper branch 210 and the second-stage jumper branch 220, and the first switching tube Q1, the second switching 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 branch 210 includes a seventh resistor connected in series between the control terminal of the first switching tube Q1 and the control terminal of the second switching tube 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 value of 0 ohm, or may be a resistor with a certain resistance value.
In one embodiment, the second-stage jumper branch 220 includes an eighth resistor connected in series between the control terminal of the second switching tube Q2 and the input terminal of the second switching tube Q2. The selection process of the eighth resistor is similar to that of the seventh resistor, and will not be described herein.
In one embodiment, the first switching tube Q1 and the second switching tube Q2 are N-type switching tubes. It can be appreciated that when the first switching tube Q1 and the second switching tube Q2 are both N-type switching tubes, the circuit design is simplified. In other embodiments, the first switching tube Q1 and the second switching tube Q2 are P-type switching tubes; alternatively, the first switching tube Q1 and the second switching tube Q2 are switching tubes of different types, the types of the switching tubes should be selected according to the design of the design circuit, and the embodiment does not limit the types of the switching tubes.
In one embodiment, the first switching transistor Q1 and the second switching transistor Q2 are transistors, or the first switching transistor Q1 and the second switching transistor Q2 are CMOS transistors. It can be appreciated that when the first switching tube Q1 and the second switching tube Q2 are all triodes, or the first switching tube Q1 and the second switching tube Q2 are CMOS tubes, the circuit design is further simplified.
Based on the same inventive concept, an embodiment of the present invention further provides a lighting control system, referring to fig. 3, the lighting control system includes a master control circuit 10, a ballast 20, and a control circuit 30 connected in series between the master control circuit 10 and the ballast 20; the control circuit 30 is the control circuit 30 according to any one 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, the connection mode, the initial level, the level voltage and the ballast level enable are all different, and can be adapted and achieve the same effect, so that the control circuit has the characteristics of high applicability, high cooperativity and high stability, can meet the control requirements of most ballasts 20 in the market, and can achieve the same control effect as before replacement by only slightly changing the welding elements of the control circuit 30 after replacing the ballasts 20, thereby effectively solving the problem that the control circuit 30 needs to be changed due to the use of ballasts 20 with different models; in addition, since the control circuit 30 has versatility, the control circuit 30 can realize the matching of the main control circuit 10 and the ballast 20, so that the purchase of various types of main control circuits 10 is not required, and the difficulty of material management can be reduced. In addition, since the control circuit 30 does not need to be changed, the problems of high cost, poor design, and the like due to low compatibility of 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, respectively, and the switch control module, the state feedback control module, and the dimming control module each include one control circuit 30.
It will be appreciated that the lighting control system includes three sets of circuits: the system comprises a switch control module, a state feedback control module and a dimming control module. The switch control module, the status feedback control module and the dimming control module comprise one of said control circuits 30 for implementing the matching of the master control circuit 10 with the ballast 20.
In one embodiment, the master control circuit 10 includes a single chip microcomputer, a digital signal processing chip or a logic chip. The input signal may be a serial signal, a level switching signal or a driving signal. In this embodiment, the main control circuit 10 is an MCU (Microcontroller Unit, micro control unit) intelligent chip, specifically may be a single chip microcomputer, a digital signal processing chip or a logic chip, etc., and is configured to generate the input signal and provide the input signal to the control circuit 30.
In one embodiment, the input signal in the switch control module is a switch signal generated by the main control circuit 10, and the switch control module further includes a circuit break protection unit 300 and a detection feedback unit 400.
A circuit breaking protection unit 300 is connected in series between the control circuit 30 and the ballast 20 for detecting an operating current of the control circuit 30 and the ballast 20 and disconnecting the control circuit 30 and the ballast 20 when the operating current exceeds a preset threshold.
The detection feedback unit 400 is connected in series between the output end 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 circuit diagram of a practical application corresponding to the switch control module, wherein a portion on the right side of a vertical dotted line is a simplified circuit diagram of signal control inside ballast 20. The input signal in the switch control module is a switch signal generated by the master circuit 10. Wherein, the connection modes from the internal control circuit of the ballast 20 to the ballast control interface are two, and the corresponding enabling modes of the two connection modes are completely opposite, as shown in fig. 4; the first connection mode is a low-level enabling connection, and the second connection mode is a high-level enabling connection. Each control circuit inside each ballast can only have one connection mode, and the connection mode is different according to manufacturers, so that a highly universal and widely-adapted signal control circuit is more needed to correspond to the connection mode.
The working principle of the switch control module specifically comprises:
if the switching signal is required to be converted from VDD level to VCC level and output, the switching signal is subjected to reverse phase processing by the first switching tube Q1 after being limited by the third resistor R3, and then is subjected to reverse phase level conversion by the fifth resistor R5 to the second switching tube Q2, so as to obtain a switching signal after forward and level conversion.
If the switching signal needs to be inverted and the level is to be converted from VDD to VCC and then output, the switching signal is directly connected to the second switching tube Q2 through R7 after being limited by the third resistor R3, and then output after being processed by the inversion and level conversion of the second switching tube Q2.
If the switching signal can be output after only the inversion processing, the switching signal is subjected to the inversion processing by the first switching tube Q1 after being limited by the third resistor R3, and then is directly output to the interface through the eighth resistor after passing through the fifth resistor R5.
If the switching signal is directly provided to ballast 20 without being processed, the switching signal is directly output to the interface through the seventh resistor and the eighth resistor after being limited by the third resistor R3, and the first switching tube Q1, the second switching 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 also performs a single action every time the switching signal is operated under the normal operation of the switching circuit at the front end, generates an error feedback signal according to the switching signal output by the control circuit 30, and outputs the error feedback signal to the feedback unit; that is, when the MCU outputs the switching signal level switch once, the error feedback signal is also input with the level switch once under normal conditions, so as to confirm whether the switching circuit works normally.
In addition, by providing the open circuit 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 value, so as to prevent the lighting control system from being burned out due to excessive instantaneous current or overheating of the lamp.
In one embodiment, in the status feedback control module, the input signal is a status feedback signal output by ballast 20; the master control circuit 10 is further configured to determine whether the control circuit 30 is operating normally according to the feedback signal and the error feedback signal, and determine an error type when the control circuit 30 is operating abnormally.
Specifically, referring to fig. 2 again, when the error feedback signal in the switch control module is not fed back after the switch signal is output, the error type is determined to be the switch signal error; determining the type of error as ballast 20 error if the error feedback signal is fed back but the status feedback signal is not fed back after outputting the switching signal; and after the switch signal is output, if the error feedback signal and the state feedback signal are fed back, judging that the switch control module works 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 abnormal; the lighting control system further comprises an alarm device, wherein the alarm device is electrically connected with the main control circuit 10 and is used for generating sound and/or lamplight alarm according to the alarm signal.
It can be understood that after the judgment is completed, the MCU feeds back to the process of externally reminding the error, and the process can be that the corresponding state is displayed through an external indicator lamp, the buzzer reminds the corresponding error, and the display module displays the corresponding error state, so that the detection and the correction are conveniently reminded.
In one embodiment, the circuit breaking protection unit 300 includes a circuit breaking protector F1, the circuit breaking protector F1 being connected in series between the control circuit 30 and the ballast 20. In this embodiment, the control circuit is mostly applicable to a lamp, and the circuit breaking protector may be an overheat protector because the heat productivity of the lamp is large; in addition, in order to avoid burning out the lighting control system due to excessive instantaneous current, the circuit breaker may be a current protector, and the embodiment does not limit the specific type of the circuit breaker 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 breaking protector 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 end of the third switching tube Q3 and the output end of the circuit breaking protector F1, the ninth resistor R9 is connected in series between the negative electrode of the diode D1 and the control end of the third switching tube Q3, and the tenth resistor R10 is connected in series between the first power supply and the input end of the third switching tube Q3.
It will be appreciated that ballast 20 may be switched in different ways, and that ballast 20 may be enabled in different ways, either high or low, as described herein with respect to ballast 20. 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), the ballast 20 is triggered when the switching signal is at a low level, 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, and the input end of the third switching tube Q3 is grounded, and an error switching feedback signal at a low level is output, that is, when the switching signal is normal, an error feedback signal in square wave shape is generated. If the switching signal is abnormal, for example, the switching signal is constant high/low, an error feedback signal is generated which is constant low/high. Therefore, when an error feedback signal of constant low/high level is detected, the error feedback signal is considered to be not fed back, and at this time, the switching signal error can be determined.
In one embodiment, the input signal is a state feedback signal output by the ballast 20, the voltages of the first power supply and the second power supply in the state feedback module control module are VDD, and the control current is used to provide the state feedback signal with the level VDD to the main control circuit 10, so as to protect the pin of the MCU chip and avoid the state feedback signal 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. The control circuit 30 of the present invention has the following advantages over the existing control circuit 30: high adaptability, to accommodate the control requirements of most ballasts 20; high stability, and has the functions of phase inversion, level conversion, protection and error feedback; with high cooperativity, the control effect equivalent to that before replacement can be achieved by only slightly changing the welding elements of the control circuit 30 after replacing the ballasts 20, namely, 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 above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (12)
1. A control circuit, comprising:
the signal processing unit is used for receiving an input signal, carrying out inversion and/or level conversion on the input signal and outputting the input signal so that the input signal subjected to the inversion and/or level conversion is suitable for the ballast;
the jumper connection unit is connected with the signal processing unit in parallel and is used for receiving and directly outputting the input signal;
the signal processing unit comprises a first-stage reverse phase processing branch and a second-stage reverse phase 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;
the first-stage reverse phase processing branch is connected with the first-stage jumper branch in parallel, the second-stage reverse phase processing branch is connected with the second-stage jumper branch in parallel, the first-stage reverse phase processing branch and the first-stage jumper branch are not connected at the same time, and the second-stage reverse phase processing branch and the second-stage jumper branch are not connected at the same time;
when the control circuit comprises the first-stage reverse phase processing branch and the second-stage reverse phase processing branch, the control circuit is used for realizing the level conversion processing of the input signal and outputting the input signal;
when the control circuit comprises the first-stage reverse phase processing branch and the second-stage jump-connection branch, the control circuit performs reverse phase processing on the input signal and outputs the input signal;
when the control circuit comprises the second-stage inverting processing branch and the first-stage jump-connection branch, the control circuit performs inverting and level conversion processing on the input signal and outputs the signal;
the first stage inverting processing branch comprises:
the control end of the first switching tube is electrically connected with the input node, the input end of the first switching tube is electrically connected with the first power supply, and the output end of the first switching tube is grounded;
a first resistor connected in series between the first power supply and the input node;
the second resistor is connected in series between the first power supply and the input end of the first switching tube;
the third resistor is connected in series between the input node and the control end of the first switching tube; and
the fourth resistor is connected in series between the input node and the ground terminal;
the second stage inverting processing branch includes:
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 in series between the input end of the first switching tube and the control end of the second switching tube; and
and the sixth resistor is connected in series between the second power supply and the input end of the second switching tube.
2. The control circuit of claim 1, wherein,
when the control circuit comprises a first-stage jumper branch and a second-stage jumper branch, the input signal is received and directly output through the control circuit.
3. The control circuit of claim 1, wherein the first stage jumper leg comprises a seventh resistor connected in series between the control terminal of the first switching tube and the control terminal of the second switching tube.
4. The control circuit of claim 1, wherein the second stage jumper leg includes an eighth resistor connected in series between a control terminal of the second switching tube and an input terminal of the second switching tube.
5. The control circuit of any of claims 1-4, wherein the first switching tube and the second switching tube are both N-type switching tubes.
6. The control circuit of any of claims 1-4, wherein the first switching tube and the second switching tube are transistors, or wherein the first switching tube and the second switching tube are CMOS tubes.
7. A lighting control system, comprising: a master control circuit, a ballast and a control circuit connected in series between the master control circuit and the ballast;
wherein the control circuit is a control circuit according to any one of claims 1-6.
8. The lighting control system of claim 7, wherein the lighting control system comprises a switch control module, a state feedback control module, and a dimming control module, wherein the master circuit is connected to the ballast through the switch control module, the state feedback control module, and the dimming control module, respectively, and wherein the switch control module, the state feedback control module, and the dimming control module each comprise one of the control circuits.
9. The lighting control system of claim 8, wherein the input signal in the switch control module is a switch signal generated by the master circuit, the switch control module further comprising:
the circuit breaking protection unit is connected in series between the control circuit and the ballast and is used for detecting the working current of the control circuit and the ballast and disconnecting the control circuit from the ballast when the working current exceeds a preset threshold value; and
the detection feedback unit is connected in series between the output end of the circuit breaking protection unit and the main control circuit, 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.
10. The lighting control system of claim 9, wherein in the state feedback control module, the input signal is a state feedback signal output by the ballast;
the main control circuit is also used for judging whether the control circuit works normally or not according to the feedback signal and the error feedback signal, and judging the error type when the control circuit works abnormally.
11. The lighting control system of claim 10, wherein said master circuit is further configured to generate an alert signal when an operational anomaly of said control circuit is determined;
the lighting control system further comprises an alarm device, wherein the alarm device is electrically connected with the main control circuit and is used for generating sound and/or lamplight alarm according to the alarm signal.
12. The lighting control system of claim 8, wherein the master control circuit comprises a single chip, a digital signal processing chip, or a logic chip.
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| CN103442478B (en) * | 2013-07-16 | 2015-04-29 | 苏州佳世达光电有限公司 | Drive circuit and projector applying same |
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| CN2912165Y (en) * | 2006-06-01 | 2007-06-13 | 海信集团有限公司 | Level switching circuit between bus and TV set having the same |
| CN101861006A (en) * | 2010-04-09 | 2010-10-13 | 海洋王照明科技股份有限公司 | Dimming control circuit and illumination device |
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