CN217335963U - Control circuit, ballast and lamp - Google Patents
Control circuit, ballast and lamp Download PDFInfo
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- CN217335963U CN217335963U CN202122462203.0U CN202122462203U CN217335963U CN 217335963 U CN217335963 U CN 217335963U CN 202122462203 U CN202122462203 U CN 202122462203U CN 217335963 U CN217335963 U CN 217335963U
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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
Abstract
The application relates to a control circuit, a ballast and a lamp, and belongs to the technical field of lamps. The control circuit comprises a semiconductor full-bridge circuit and a control module; the semiconductor full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a current limiting unit, a first control unit, a second control unit and a current detecting resistor; the first control unit is used for controlling the current passing through a first end of the first control unit and a second end of the first control unit; and the third end of the second control unit is connected with the sixth end of the control module, and the second control unit is electrically connected with one bulb in the load under the action of the control module. The control module controls the second control unit to be connected with one bulb in the load, and adjusts the current in the circuit through the first control unit according to the working frequency of the bulb, so that the technical problem that the control circuit is automatically adjusted according to the working frequency of the bulb is solved, and automatic control is facilitated.
Description
Technical Field
The application relates to the technical field of lamps, in particular to a control circuit, a ballast and a lamp.
Background
The ballast is a converter for converting a power frequency alternating current power supply into a high frequency alternating current power supply, has the advantages of energy conservation, stable light emission, reliable starting point, high power factor, low noise and the like, and is widely applied to the field of illumination.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem of how to automatically adjust a control circuit according to the working frequency of a bulb, the application provides the control circuit, a ballast and a lamp.
In a first aspect, the present application provides a control circuit comprising a semiconductor full bridge circuit and a control module;
the semiconductor full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a current limiting unit, a first control unit, a second control unit and a current detecting resistor;
the first end of the first switch tube is connected with the first end of the second switch tube, and the first end of the first switch tube and the first end of the second switch tube are used as first input ends of the semiconductor full bridge circuit; the second end of the first switching tube is connected with the first end of the third switching tube and the first end of the current limiting unit; the third end of the first switch tube is connected with the first end of the control module;
the second end of the second switching tube is connected with the first end of the fourth switching tube and the first end of the second control unit; the third end of the second switch tube is connected with the second end of the control module;
the second end of the third switching tube is connected with the second end of the fourth switching tube, the first end of the current detection resistor and the current detection input end of the control module; the third end of the third switching tube is connected with the third end of the control module; the second end of the current detection resistor is used as the second input end of the semiconductor full bridge circuit;
the third end of the fourth switching tube is connected with the fourth end of the control module;
the second end of the current limiting unit is connected with the first end of the first control unit; the second end of the first control unit is connected with the second end of the second control unit; the third end of the first control unit is connected with the fifth end of the control module; the first control unit is used for controlling the current passing through a first end of the first control unit and a second end of the first control unit; the third end of the second control unit is connected with the sixth end of the control module, and the second control unit is electrically connected with one bulb in the load under the action of the control module;
further, the first control unit includes a switching element and a first capacitor;
a first end of the switch element is connected with a first end of the first capacitor, and the first end of the switch element and the first end of the first capacitor are used as first ends of the first control unit;
a second end of the switch element is connected with a second end of the first capacitor, and the second end of the switch element and the second end of the first capacitor are used as second ends of the first control unit;
the third end of the switch element is connected with the fifth end of the control module, and the third end of the switch element is used as the third end of the first control unit;
further, the second control unit includes: a second capacitor and a control switch;
the first end of the second capacitor is connected with the common end of the control switch, and the first end of the second capacitor and the common end of the control switch are used as the second end of the second control unit;
a second end of the second capacitor is connected with a second end of the second switching tube and a first end of the fourth switching tube, and the second end of the second capacitor is used as a first end of the second control unit;
the control switch comprises at least one output port, the number of the output ports corresponds to the number of bulbs in the load in a one-to-one manner, each output port is used for being connected with a first end of the corresponding bulb, and a second end of the bulb is connected with a first end of the second control unit;
the control end of the control switch is connected with the sixth end of the control module and is used for controlling the connection between the common end of the control switch and the output port;
furthermore, the number of the output ports of the control switch is two, and the control switch comprises a first output port and a second output port; the load comprises two bulbs, and the two bulbs comprise a first bulb and a second bulb;
the first output port is connected with a first end of the first bulb, the second output port is connected with a first end of the second bulb, a second end of the second capacitor is connected with a second end of the first bulb and a second end of the second bulb, and the second end of the second capacitor, the second end of the first bulb and the second end of the second bulb are used as first ends of the second control unit;
further, the first bulb is a sodium lamp, and the second bulb is a ceramic metal halide lamp or a metal halide lamp;
the first end of the sodium lamp is connected with the first output port, and the second end of the sodium lamp is connected with the second end of the second capacitor;
the first end of the ceramic metal halide lamp or the first end of the metal halide lamp is connected with the second output port, and the second end of the ceramic metal halide lamp or the second end of the metal halide lamp is connected with the second end of the second capacitor;
further, the current limiting unit includes a first inductor;
the first end of the first inductor is connected with the second end of the first switching tube and the first end of the third switching tube; the second end of the first inductor is connected with the first end of the first control unit;
further, the control circuit also comprises a rectifying circuit and a power factor correction circuit;
the input end of the rectifying circuit is connected with an alternating current power supply, the output end of the rectifying circuit is connected with the input end of the power factor correction circuit, and the output end of the power factor correction circuit is connected with the input end of the semiconductor full-bridge circuit;
further, the rectifier circuit includes: a first diode, a second diode, a third diode and a fourth diode; the power factor correction circuit includes: the second inductor, the fifth diode, the fifth switching tube and the third capacitor;
the cathode of the first diode is connected with the anode of the second diode, and the cathode of the first diode and the anode of the second diode are used as first input ends of the rectifying circuit; the first input end of the rectifying circuit is connected with a live wire;
the cathode of the second diode is connected with the cathode of the third diode, and the cathode of the second diode and the cathode of the third diode are used as a first output end of the rectifying circuit;
the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the third diode and the cathode of the fourth diode are used as second input ends of the rectifying circuit; the second input end of the rectifying circuit is connected with a zero line;
the anode of the fourth diode is connected with the anode of the first diode, and the anode of the fourth diode and the anode of the first diode are used as second output ends of the rectifying circuit;
the first end of the second inductor is connected with the first output end of the rectifying circuit, and the second end of the second inductor is connected with the anode of the fifth diode and the first end of the fifth switching tube;
the cathode of the fifth diode is connected with the first end of the third capacitor, the first end of the first switch tube and the first end of the second switch tube;
the second end of the fifth switching tube is connected with the second output end of the rectifying circuit, the second end of the third capacitor and the second end of the current detection resistor and is grounded; and the third end of the fifth switching tube is connected with the seventh end of the control module.
In a second aspect, the present application provides a ballast comprising a control circuit according to any of the above aspects.
In a third aspect, the present application provides a lamp including the ballast of the above aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the control circuit provided by the embodiment of the application comprises a semiconductor full-bridge circuit and a control module; the semiconductor full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a current limiting unit, a first control unit, a second control unit and a current detecting resistor; the first control unit is used for controlling the current passing through a first end of the first control unit and a second end of the first control unit; and the third end of the second control unit is connected with the sixth end of the control module, and the second control unit is electrically connected with one bulb in the load under the action of the control module.
When the control circuit works, the control module controls the second control unit to be connected with one bulb in the load, and the current in the circuit is regulated through the first control unit according to the working frequency of the used bulb, so that the technical problem that the control circuit is automatically regulated according to the working frequency of the bulb is solved, the automatic control is convenient, the bulb works under the rated current, and the service life of the bulb is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a semiconductor full bridge circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a control circuit according to an embodiment of the present disclosure.
The reference numbers are as follows:
101-semiconductor full bridge circuit; 102-a control module; s1-a first switch tube; s2-a second switch tube; s3-a third switch tube; s4-a fourth switching tube; 201-a current limiting unit; 202-a first control unit; 203-a second control unit; r-current detecting resistance; s5-a switching element; CS-a first capacitance; CP-second capacitance; SS-control switch; LAMP 1-first bulb; LAMP2 — second bulb; l1 — first inductance; 103-a rectifying circuit; 104-power factor correction circuit; d1 — first diode; d2 — second diode; d3 — third diode; d4 — fourth diode; l2 — second inductance; d5-fifth diode; e1 — third capacitance; s6-a fifth switch tube; a1 — first end of control module; a2 — second end of control module; a3-a third terminal of the control module; a4-fourth end of control module; a5-fifth end of control module; a6-sixth terminal of control module; a7-seventh terminal of control module; b-current detection input end of control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The first embodiment of the present application provides a control circuit, as shown in fig. 1, including a semiconductor full bridge circuit 101 and a control module 102.
The semiconductor full bridge circuit 101, as shown in fig. 2, includes a first switch transistor S1, a second switch transistor S2, a third switch transistor S3, a fourth switch transistor S4, a current limiting unit 201, a first control unit 202, a second control unit 203, and a current detecting resistor R.
The connection relationship is as follows: a first end of the first switch tube S1 is connected to a first end of the second switch tube S2, and a first end of the first switch tube S1 and a first end of the second switch tube S2 are used as first input ends of the semiconductor full bridge circuit 101; a second end of the first switching tube S1 connects a first end of the third switching tube S3 and a first end of the current limiting unit 201; the third terminal of the first switch tube S1 is connected to the first terminal a1 of the control module.
A second end of the second switching tube S2 is connected to a first end of the fourth switching tube S4 and a first end of the second control unit 203; the third terminal of the second switch tube S2 is connected to the second terminal A2 of the control module.
The second end of the third switching tube S3 is connected with the second end of the fourth switching tube S4, the first end of the current detection resistor R and the current detection input end B of the control module; the third end of the third switching tube S3 is connected with the third end A3 of the control module; the second end of the current detecting resistor R serves as a second input end of the semiconductor full bridge circuit 101.
The third end of the fourth switching tube S4 is connected with the fourth end A4 of the control module.
A second end of the current limiting unit 201 is connected with a first end of the first control unit 202; the second end of the first control unit 202 is connected with the second end of the second control unit 203; the third end of the first control unit 202 is connected with the fifth end A5 of the control module; the first control unit 202 is used for controlling the current passing through the first end of the first control unit 202 and the second end of the first control unit 202; the third terminal of the second control unit 203 is connected to the sixth terminal a6 of the control module, and the second control unit 203 is electrically connected to one of the light bulbs in the load under the action of the control module 102.
The third end of the switch tube is a control end, and the control module 102 controls whether the first end and the second end are conducted through the third end of the switch tube. The switch tube may be an insulated gate field effect transistor, i.e. an MOS transistor, and the control module 102 is connected to a gate of the MOS transistor to control whether a source and a drain are turned on.
The control module 102 controls the four switching tubes to be opened and closed through a PWM wave (pulse width modulation wave). The control module 102 outputs a PWM1 signal for controlling the first switch tube S1 to be turned on and off through the first end a1 of the control module; outputting a PWM2 signal for controlling the second switch tube S2 to be switched on and off through a second end A2 of the control module; outputting a PWM3 signal for controlling the opening and closing of a third switching tube S3 through a third end A3 of the control module; the PWM4 signal controlling the on and off of the fourth switching tube S4 is output through the fourth terminal a4 of the control module.
When the lamp is turned on, the PWM1 and the PWM4 are a pair of signals, the PWM2 and the PWM3 are a pair of signals, the control module 102 controls the first switching tube S1 and the fourth switching tube S4 to be opened or closed at the same time through the PWM1 and the PWM4, and the control module 102 controls the second switching tube S2 and the third switching tube S3 to be opened or closed at the same time through the PWM2 and the PWM 3. The control module 102 outputs the frequency sweep frequency of 70KHz to 200KHz through four output ends to light the bulb.
When the control circuit works, the control module controls the second control unit 203 to be connected with one bulb in a load, and adjusts the current in the circuit through the first control unit 202 according to the working frequency of the used bulb, so that the technical problem of automatically adjusting the control circuit according to the working frequency of the bulb is solved, automatic control is facilitated, the bulb works under the rated current, and the service life of the bulb is prolonged.
In one embodiment, as shown in fig. 3, the first control unit 202 includes a switching element S5 and a first capacitor CS.
The connection relationship is as follows: a first terminal of the switching element S5 is connected to a first terminal of the first capacitor CS, and a first terminal of the switching element S5 and the first terminal of the first capacitor CS are used as first terminals of the first control unit 202; a second terminal of the switching element S5 is connected to a second terminal of the first capacitor CS, and a second terminal of the switching element S5 and a second terminal of the first capacitor CS are used as a second terminal of the first control unit 202; the third terminal of the switching element S5 is connected to the fifth terminal a5 of the control module, and the third terminal of the switching element S5 is the third terminal of the first control unit 202.
The switching element S5 may be a relay or a switch tube. In the case of a relay, S5 represents a pair of normally open contacts of the relay, two ends of S5 are respectively used as a first end and a second end of the switching element S5, and the fifth end a5 of the control module is connected to a coil of the relay to control the opening or closing of the pair of normally open contacts of the relay.
In the stage of lighting the lamp (also called as the ignition stage), the control module outputs a signal to control the relay through the fifth end of the control module, so that the S5 is switched off, and the first capacitor CS can cut off direct current to prevent magnetic biasing. After the lamp is turned on (also called a normal operation stage), the control S5 is turned on, and the two ends of the first control unit 202 are conducted, so that the passing capacity of the direct current can be improved.
In one embodiment, as shown in fig. 3, the second control unit 203 includes: a second capacitor CP and a control switch SS.
The connection relationship is as follows: a first end of the second capacitor CP is connected to a common end of the control switch SS, and the first end of the second capacitor CP and the common end of the control switch SS are used as a second end of the second control unit 203; a second end of the second capacitor CP is connected to the second end of the second switching tube S2 and the first end of the fourth switching tube S4, and the second end of the second capacitor CP serves as the first end of the second control unit 203; the control switch SS comprises at least one output port, the number of the output ports corresponds to the number of the bulbs in the load, each output port is used for connecting a first end of the corresponding bulb, and a second end of the bulb is connected with a first end of the second control unit 203; and the control end of the control switch SS is connected with the sixth end A6 of the control module and is used for controlling the connection of the common end of the control switch and the output port.
Wherein the control switch is used for controlling the electric connection with one bulb in the load, the load can contain a plurality of bulbs, and the type of each bulb can be different. And in the working process of the control circuit, only one bulb is connected at the same time. The control switch SS can switch the connected bulb. In order to facilitate centralized control, in the application scenario of centralized lighting, the control switches SS in multiple control circuits can be managed together. The control switch SS may be a knob switch, each shift position corresponds to a light bulb, and when the shift position is rotated, the control switch SS is connected with the light bulb. Of course, the control switch SS can also be any other switch with a single-pole-multiple-throw function (the common terminal is connected to only one output port at a time). The control switch SS may also be a switch automatically controlled by the control module for more convenient control thereof. The second capacitor CP is used for filtering.
In one embodiment, the number of output ports of the control switch SS is two, as shown in fig. 3, and includes a first output port and a second output port; the number of bulbs in the load is two, including a first bulb LAMP1 and a second bulb LAMP 2.
The connection relationship is as follows: the first output port is connected to the first end of the first LAMP1, the second output port is connected to the first end of the second LAMP2, the second end of the second capacitor CP is connected to the second end of the first LAMP1 and the second end of the second LAMP2, and the second end of the second capacitor CP, the second end of the first LAMP1 and the second end of the second LAMP2 serve as the first end of the second control unit 203.
The load connected here may be a High Intensity Discharge (HID) lamp, including a mercury lamp, a sodium lamp, a metal halide lamp, a xenon lamp, and so on.
In this embodiment, the first bulb LAMP1 may be a sodium LAMP, and the second bulb LAMP2 may be a ceramic metal halide LAMP or a metal halide LAMP.
The first end of the sodium lamp is connected with the first output port, and the second end of the sodium lamp is connected with the second end of the second capacitor CP; the first end of the ceramic metal halide lamp or the first end of the metal halide lamp is connected with the second output port, and the second end of the ceramic metal halide lamp or the second end of the metal halide lamp is connected with the second end of the second capacitor CP.
The sodium lamp has few acoustic resonance points, is suitable for working under high frequency, has high efficiency when using high frequency, has no low-frequency noise, and has simple control logic; the ceramic metal halide lamp and the metal halide lamp have multiple acoustic resonance points, are suitable for working under low frequency, can eliminate acoustic resonance by using low frequency, reduce current impact of bulb reversing, have more stable light and prolong the service life of the bulb.
The circuit works as follows: during the ignition phase, a high frequency sweep is used, and during the sweep, S5 is turned off, and the first capacitor CS is used for cutting off direct current to prevent magnetic bias. When the sodium lamp is lighted, a pair of PWM1 and PWM4 and a pair of PWM2 and PWM3 output sweep frequency of 200KHz to 70KHz, and the power is controlled by adjusting the PWM frequency according to the current on the current detection resistor R after the bulb is lighted.
When a ceramic metal halide lamp or a metal halide lamp is lighted, a pair of PWM1 and PWM4 and a pair of PWM2 and PWM3 output frequency sweep frequency from 200KHz to 70KHz, after a bulb is lighted, a pair of PWM1 and PWM4 are lighted, and when PWM1 outputs 70KHz high frequency, PWM4 outputs high level at low frequency of 100 Hz; PWM2 and PWM3 are paired, when PWM2 outputs 70KHz high frequency, PWM3 outputs high level at 100Hz low frequency; PWM3 and PWM4 are complementary symmetric signals; the power is controlled according to the current of the current detection resistor R, the PWM1 and the duty ratio of the PWM2, and the ceramic metal halide lamp or the metal halide lamp is switched on at low frequency S5, so that the direct current passing capacity is improved.
It should be noted that, in this embodiment, the number of the output ports of the control switch and the number of the light bulbs are two only for example, and in the actual use process, the control switch with more than two output ports and the corresponding connection of more than two light bulbs may be selected as needed, and of course, the control switch with one output port may also be selected and connected to one light bulb working at a low frequency, and the control switch is turned off in the ignition stage S5, and is turned on in the working stage S5 after the light bulb is turned on, so that the effects of using light more stably and prolonging the service life of the light bulb may also be achieved.
In one embodiment, the current limiting unit 201 includes a first inductor L1. A first end of the first inductor L1 is connected to the second end of the first switch tube S1 and the first end of the third switch tube S3; a second terminal of the first inductance L1 is connected to a first terminal of the first control unit 202. The first inductor L1 functions as a current limiter in the circuit.
In one embodiment, as shown in fig. 1, the control circuit further comprises a rectifying circuit 103 and a power factor correction circuit 104.
The input end of the rectifying circuit 103 is connected with an alternating current power supply, the output end of the rectifying circuit 103 is connected with the input end of the power factor correction circuit 104, and the output end of the power factor correction circuit 104 is connected with the input end of the semiconductor full bridge circuit 101. The rectification circuit is used for rectifying input alternating current into direct current, and the power factor correction circuit is used for reducing the transmission loss of the circuit and has an energy-saving effect.
The rectifier circuit 103, as shown in fig. 3, includes: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, and a power factor correction circuit 104(PFC circuit) including: a second inductor L2, a fifth diode D5, a fifth switch tube S6 and a third capacitor E1.
The connection relationship is as follows: the cathode of the first diode D1 is connected with the anode of the second diode D2, and the cathode of the first diode D1 and the anode of the second diode D2 are used as first input ends of the rectifying circuit 103; a first input end of the rectifying circuit 103 is connected with a live wire; the cathode of the second diode D2 is connected to the cathode of the third diode D3, and the cathode of the second diode D2 and the cathode of the third diode D3 serve as a first output terminal of the rectifying circuit 103; the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and the anode of the third diode D3 and the cathode of the fourth diode D4 are used as second input terminals of the rectifying circuit 103; a second input end of the rectifying circuit 103 is connected with a zero line; an anode of the fourth diode D4 is connected to an anode of the first diode D1, and an anode of the fourth diode D4 and an anode of the first diode D1 serve as a second output terminal of the rectifying circuit 103.
A first end of the second inductor L2 is connected to the first output end of the rectifying circuit 103, and a second end of the second inductor L2 is connected to the anode of the fifth diode D5 and the first end of the fifth switching tube S6; a cathode of the fifth diode D5 is connected to the first end of the third capacitor E1, the first end of the first switch tube S1 and the first end of the second switch tube S2; a second end of the fifth switching tube S6 is connected to the second output end of the rectifying circuit 103, the second end of the third capacitor E1, and the second end of the current detection resistor R, and is grounded; the third end of the fifth switch tube S6 is connected with the seventh end A7 of the control module.
It should be noted that the rectifier circuit and the PFC circuit provided in the embodiment of the present application are only an illustration, and other rectifier circuits or PFC circuits may be designed to implement the functions thereof.
The control module 102 may use a single chip microcomputer or a micro control Unit (MCU for short) to open and close a switch tube or a control switch.
It should be noted that the high frequency and the low frequency described in the embodiments of the present application are relative terms, and in the present embodiment, the high frequency is referred to as higher than 6KHZ, and the low frequency is referred to as lower than 200 HZ.
A second embodiment of the present application provides a ballast including the control circuit of any of the first embodiments.
The ballast using the control circuit has the advantages that the control module controls the second control unit to be connected with one bulb in the load, and the current in the circuit is adjusted through the first control unit according to the working frequency of the used bulb, so that the technical problem that the control circuit is automatically adjusted according to the working frequency of the bulb is solved, the automatic control is convenient, and the performance of the ballast is improved.
A third embodiment of the present application provides a lamp including the ballast of the second embodiment.
The lamp using the ballast can switch bulbs according to different application scenes, can drive a plurality of bulbs by using one ballast, realizes circuit switching according to the working frequency of the bulbs, and improves the performance of the lamp.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The control circuit is characterized by comprising a semiconductor full bridge circuit and a control module;
the semiconductor full-bridge circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a current limiting unit, a first control unit, a second control unit and a current detecting resistor;
the first end of the first switch tube is connected with the first end of the second switch tube, and the first end of the first switch tube and the first end of the second switch tube are used as the first input end of the semiconductor full-bridge circuit; the second end of the first switching tube is connected with the first end of the third switching tube and the first end of the current limiting unit; the third end of the first switch tube is connected with the first end of the control module;
the second end of the second switching tube is connected with the first end of the fourth switching tube and the first end of the second control unit; the third end of the second switch tube is connected with the second end of the control module;
the second end of the third switching tube is connected with the second end of the fourth switching tube, the first end of the current detection resistor and the current detection input end of the control module; the third end of the third switching tube is connected with the third end of the control module; the second end of the current detection resistor is used as the second input end of the semiconductor full bridge circuit;
the third end of the fourth switching tube is connected with the fourth end of the control module;
the second end of the current limiting unit is connected with the first end of the first control unit; the second end of the first control unit is connected with the second end of the second control unit; the third end of the first control unit is connected with the fifth end of the control module; the first control unit is used for controlling the current passing through a first end of the first control unit and a second end of the first control unit; and the third end of the second control unit is connected with the sixth end of the control module, and the second control unit is electrically connected with one bulb in the load under the action of the control module.
2. The control circuit according to claim 1, wherein the first control unit includes a switching element and a first capacitor;
a first end of the switch element is connected with a first end of the first capacitor, and the first end of the switch element and the first end of the first capacitor are used as first ends of the first control unit;
a second end of the switch element is connected with a second end of the first capacitor, and the second end of the switch element and the second end of the first capacitor are used as second ends of the first control unit;
and the third end of the switch element is connected with the fifth end of the control module, and the third end of the switch element is used as the third end of the first control unit.
3. The control circuit according to claim 1, wherein the second control unit comprises: a second capacitor and a control switch;
the first end of the second capacitor is connected with the common end of the control switch, and the first end of the second capacitor and the common end of the control switch are used as the second end of the second control unit;
a second end of the second capacitor is connected with a second end of the second switching tube and a first end of the fourth switching tube, and a second end of the second capacitor is used as a first end of the second control unit;
the control switch comprises at least one output port, the number of the output ports corresponds to the number of bulbs in the load in a one-to-one manner, each output port is used for being connected with a first end of the corresponding bulb, and a second end of the bulb is connected with a first end of the second control unit;
and the control end of the control switch is connected with the sixth end of the control module and is used for controlling the connection between the common end of the control switch and the output port.
4. The control circuit of claim 3, wherein the number of output ports of the control switch is two, including a first output port and a second output port; the load comprises two bulbs, and the two bulbs comprise a first bulb and a second bulb;
the first output port is connected with a first end of the first bulb, the second output port is connected with a first end of the second bulb, a second end of the second capacitor is connected with a second end of the first bulb and a second end of the second bulb, and the second end of the second capacitor, the second end of the first bulb and the second end of the second bulb are used as first ends of the second control unit.
5. The control circuit of claim 4, wherein the first bulb is a sodium lamp and the second bulb is a ceramic metal halide lamp or a metal halide lamp;
the first end of the sodium lamp is connected with the first output port, and the second end of the sodium lamp is connected with the second end of the second capacitor;
the first end of the ceramic metal halide lamp or the first end of the metal halide lamp is connected with the second output port, and the second end of the ceramic metal halide lamp or the second end of the metal halide lamp is connected with the second end of the second capacitor.
6. The control circuit of claim 1, wherein the current limiting unit comprises a first inductor;
the first end of the first inductor is connected with the second end of the first switching tube and the first end of the third switching tube; the second end of the first inductor is connected with the first end of the first control unit.
7. The control circuit of claim 1, wherein the control circuit further comprises a rectifier circuit and a power factor correction circuit;
the input end of the rectifying circuit is connected with an alternating current power supply, the output end of the rectifying circuit is connected with the input end of the power factor correction circuit, and the output end of the power factor correction circuit is connected with the input end of the semiconductor full-bridge circuit.
8. The control circuit according to claim 7, wherein the rectifier circuit comprises: a first diode, a second diode, a third diode and a fourth diode; the power factor correction circuit includes: the second inductor, the fifth diode, the fifth switching tube and the third capacitor;
the cathode of the first diode is connected with the anode of the second diode, and the cathode of the first diode and the anode of the second diode are used as first input ends of the rectifying circuit; the first input end of the rectifying circuit is connected with a live wire;
the cathode of the second diode is connected with the cathode of the third diode, and the cathode of the second diode and the cathode of the third diode are used as a first output end of the rectifying circuit;
the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the third diode and the cathode of the fourth diode are used as second input ends of the rectifying circuit; the second input end of the rectifying circuit is connected with a zero line;
the anode of the fourth diode is connected with the anode of the first diode, and the anode of the fourth diode and the anode of the first diode are used as second output ends of the rectifying circuit;
the first end of the second inductor is connected with the first output end of the rectifying circuit, and the second end of the second inductor is connected with the anode of the fifth diode and the first end of the fifth switching tube;
the cathode of the fifth diode is connected with the first end of the third capacitor, the first end of the first switch tube and the first end of the second switch tube;
the second end of the fifth switching tube is connected with the second output end of the rectifying circuit, the second end of the third capacitor and the second end of the current detection resistor and is grounded; and the third end of the fifth switching tube is connected with the seventh end of the control module.
9. A ballast comprising a control circuit as claimed in any one of claims 1 to 8.
10. A luminaire comprising the ballast of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122462203.0U CN217335963U (en) | 2021-10-12 | 2021-10-12 | Control circuit, ballast and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122462203.0U CN217335963U (en) | 2021-10-12 | 2021-10-12 | Control circuit, ballast and lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217335963U true CN217335963U (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122462203.0U Active CN217335963U (en) | 2021-10-12 | 2021-10-12 | Control circuit, ballast and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217335963U (en) |
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2021
- 2021-10-12 CN CN202122462203.0U patent/CN217335963U/en active Active
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