CN111556636B - Lamp tube driving circuit, lamp tube driving device and lamp tube - Google Patents
Lamp tube driving circuit, lamp tube driving device and lamp tube Download PDFInfo
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- CN111556636B CN111556636B CN202010423221.5A CN202010423221A CN111556636B CN 111556636 B CN111556636 B CN 111556636B CN 202010423221 A CN202010423221 A CN 202010423221A CN 111556636 B CN111556636 B CN 111556636B
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- 238000005859 coupling reaction Methods 0.000 claims description 28
- 238000002955 isolation Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 9
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- 239000003990 capacitor Substances 0.000 description 68
- 238000002565 electrocardiography Methods 0.000 description 20
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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
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/28—Circuit arrangements for protecting against abnormal temperature
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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
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/25—Circuit arrangements for protecting against overcurrent
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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 application belongs to the technical field of lamp tubes, and provides a lamp tube driving circuit, a lamp tube driving device and a lamp tube, impedance matching is carried out through a first filament matching circuit and a second filament matching circuit, and a contact current protection circuit is adopted to generate a second direct current voltage signal according to alternating current, a temperature detection circuit is adopted to detect the temperature of circuit components and generate a temperature detection signal, a switch control circuit is used to generate a switch control signal according to the temperature detection signal and the second direct current voltage signal, the switch circuit is conducted or turned off according to the switch control signal, so that the connection state between a power output circuit and a light source module is controlled, and thus, the power output is turned off in time when the lamp tube leaks electricity or the temperature is too high, the problem that an electronic ballast (ECG) lamp tube cannot provide protection when the electricity leakage or the temperature is too high is solved, and potential safety hazards exist is solved.
Description
Technical Field
The application belongs to the technical field of lamps and lanterns, and particularly relates to a lamp tube driving circuit, a lamp tube driving device and a lamp tube.
Background
With the technical progress, the advantages of the LED fluorescent lamp in lighting application are gradually highlighted, and the LED fluorescent lamp has the characteristics of high luminous efficiency and low energy consumption, so that the LED fluorescent lamp is widely applied to various occasions, and is particularly suitable for the general lighting fields of modern home furnishings, businesses and the like.
However, existing electronic ballast (ECG) tubes fail to provide protection in the event of leakage or excessive temperatures, with major safety hazards.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the application provides a lamp driving circuit, a lamp driving device and a lamp, and aims to solve the problems that an electronic ballast (ECG) lamp cannot provide protection when electric leakage or temperature is too high, and potential safety hazards exist.
A first aspect of the present application provides a lamp driving circuit connected to a light source load, the lamp driving circuit comprising:
the first filament matching circuit is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a first end and a second end of the electronic ballast;
the power output circuit is connected with the first filament matching circuit and is used for receiving the alternating current and converting the alternating current into direct current so as to drive the light source load to be lightened;
the second filament matching circuit is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a third end and a fourth end of the electronic ballast;
the contact current protection circuit is respectively connected with the first filament matching circuit and the second filament matching circuit and is used for receiving the alternating current and generating a second direct current voltage signal according to the alternating current;
the temperature detection circuit is connected with the power output circuit and is used for detecting the temperature of the circuit components and generating a temperature detection signal according to the detection result;
the switch control circuit is connected with the contact current protection circuit and the temperature detection circuit and is used for receiving the temperature detection signal and the second direct-current voltage signal and generating a switch control signal according to the temperature detection signal and the second direct-current voltage signal; and
the switch circuit is respectively connected with the power output circuit, the switch control circuit and the light source load, and is used for receiving the switch control signal and conducting or switching off according to the switch control signal so as to control the connection state between the power output circuit and the light source load.
Optionally, the power output circuit includes:
the first rectifying unit is connected with the first filament matching circuit and is used for receiving the alternating current and converting the alternating current into direct current;
and the filtering unit is connected with the first rectifying unit and is used for filtering the direct current.
Optionally, the power output circuit further includes:
and the load discharging unit is respectively connected with the filtering unit and the light source load and is used for providing discharge protection for the light source load.
Optionally, the contact current protection circuit includes:
the isolation coupling unit is connected with the first filament matching circuit and the second filament matching circuit respectively and is used for carrying out isolation coupling treatment on the alternating current;
the second rectifying unit is connected with the isolation coupling unit and is used for converting the alternating current into direct current;
the linear voltage stabilizing unit is connected with the second rectifying unit and is used for receiving the direct current and generating a first direct current voltage signal according to the direct current; and
and the relay unit is connected with the linear voltage stabilizing unit and is used for receiving the first direct-current voltage signal and generating the second direct-current voltage signal according to the first direct-current voltage signal.
Optionally, the temperature detection circuit includes: the resistance value of the thermistor unit changes along with the temperature change of the circuit component;
the first end of the resistor unit is connected with the power output circuit, the second end of the resistor unit and the first end of the thermistor unit are commonly connected with the switch control circuit, and the second end of the thermistor unit is grounded.
Optionally, the switch control circuit includes:
the threshold voltage unit is connected with the contact current protection circuit and is used for receiving the second direct-current voltage signal and generating a threshold voltage signal according to the second direct-current voltage signal;
the comparator unit is respectively connected with the temperature detection circuit and the threshold voltage unit and is used for comparing the temperature detection signal with the threshold voltage signal to generate a voltage comparison signal; and
and the control unit is respectively connected with the comparator unit and the switching circuit and is used for receiving the voltage comparison signal and generating the switching control signal according to the voltage comparison signal.
Optionally, the switch control circuit further includes:
and the coupling current limiting unit is connected with the contact current protection circuit and is used for carrying out coupling current limiting treatment on the second direct-current voltage signal.
Optionally, the switch control circuit further includes:
and the voltage stabilizing unit is respectively connected with the contact current protection circuit, the comparator unit and the threshold voltage unit and is used for carrying out voltage stabilizing treatment on the second direct-current voltage signal to generate a third direct-current voltage signal so as to supply power to the threshold voltage unit and the comparator unit.
The embodiment of the application also provides a lamp driving device, which comprises the lamp driving circuit.
The embodiment of the application also provides a lamp tube, which comprises:
a light source load; and
the lamp driving circuit according to any one of the preceding claims, wherein the lamp driving circuit is connected to the light source load.
The embodiment of the application provides a lamp tube driving circuit, a lamp tube driving device and a lamp tube, impedance matching is carried out through a first filament matching circuit and a second filament matching circuit, a contact current protection circuit is adopted to generate a second direct current voltage signal according to alternating current, a temperature detection circuit is adopted to detect the temperature of circuit components and generate a temperature detection signal, a switch control circuit is adopted to generate a switch control signal according to the temperature detection signal and the second direct current voltage signal, the switch circuit is conducted or turned off according to the switch control signal, so that the connection state between a power output circuit and a light source load is controlled, and therefore power output is turned off in time when the lamp tube is leaked or the temperature is too high, the problem that an electronic ballast (ECG) lamp tube cannot provide protection when the leakage or the temperature is too high is solved, and potential safety hazards exist.
Drawings
Fig. 1 is a schematic circuit diagram of a lamp driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a power output circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a contact current protection circuit according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of another lamp driving circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of another lamp driving circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of another lamp driving circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The present embodiment provides a lamp driving circuit, referring to fig. 1, in which the lamp driving circuit in this embodiment is connected to a light source load 80, and specifically, the lamp driving circuit in this embodiment includes a first filament matching circuit 10, a power output circuit 20, a second filament matching circuit 30, a contact current protection circuit 40, a temperature detection circuit 50, a switch control circuit 60, and a switch circuit 70.
The first filament matching circuit 10 is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a first end and a second end of the electronic ballast; the power output circuit 20 is connected with the first filament matching circuit 10, and is used for receiving alternating current and converting the alternating current into direct current so as to drive the light source load 80 to light; the second filament matching circuit 30 is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a third end and a fourth end of the electronic ballast; the contact current protection circuit 40 is connected with the first filament matching circuit 10 and the second filament matching circuit 30 respectively, and is used for receiving alternating current and generating a second direct current voltage signal according to the alternating current; the temperature detection circuit 50 is connected with the power output circuit 20, and is used for detecting the temperature of the circuit components and generating a temperature detection signal according to the detection result; the switch control circuit 60 is connected with the contact current protection circuit 40 and the temperature detection circuit 50, and is used for receiving the temperature detection signal and the second direct current voltage signal and generating a switch control signal according to the temperature detection signal and the second direct current voltage signal; the switch circuit 70 is connected to the power output circuit 20, the switch control circuit 60, and the light source load 80, and is configured to receive the switch control signal, and conduct or turn off according to the switch control signal, so as to control a connection state between the power output circuit 20 and the light source load 80.
The ECG (electronic ballast) tube is usually matched with a compatible ECG for use, however, due to the similar appearance of the product, misuse is difficult to avoid at the client, if the ECG tube is connected to an incompatible ECG, the heat is generated due to overcurrent of components in the lamp cap, and even the tube is burnt out in severe cases, so that potential safety hazard is caused. In this embodiment, the temperature detection circuit 50 is added to the lamp tube driving circuit to monitor the temperature of the components in the lamp cap in real time, and when the temperature of the components in the lamp cap reaches the threshold temperature, the power output circuit 20 is disconnected from the light source load 80, so as to achieve the purpose of protecting the light source load 80 and avoid the damage of the light source load 80.
In one embodiment, the first filament matching circuit 10 and the second filament matching circuit 30 are symmetrically arranged for impedance matching with a resistor in an electronic ballast (ECG), thereby enhancing ECG compatibility by means of inductive reactance matching.
In one embodiment, the inductance value of the first filament matching circuit 10 and the second filament matching circuit 30 is 10-20 ohms.
In one embodiment, referring to fig. 2, the power output circuit 20 includes a first rectifying unit 21 and a filtering unit 22, wherein the first rectifying unit 21 is connected to the first filament matching circuit 10, for receiving an alternating current and converting the alternating current into a direct current; the filtering unit 22 is connected to the first rectifying unit 21, and is configured to filter the direct current.
In one embodiment, referring to fig. 2, the power output circuit 20 further includes a load discharge unit 23, and the load discharge unit 23 is connected to the filter unit 22 and the light source load 80, respectively, for providing discharge protection to the light source load 80.
In one embodiment, referring to fig. 3, the contact current protection circuit 40 includes an isolation coupling unit 41, a second rectifying unit 42, a linear voltage stabilizing unit 43, and a relay unit 44, wherein the isolation coupling unit 41 is connected to the first filament matching circuit 10 and the second filament matching circuit 30, respectively, for performing an isolation coupling process on the alternating current; the second rectifying unit 42 is connected to the isolation coupling unit 41, and is used for converting alternating current into direct current; the linear voltage stabilizing unit 43 is connected with the second rectifying unit 42, and is used for receiving direct current and generating a first direct current voltage signal according to the direct current; the relay unit 44 is connected to the linear voltage stabilizing unit 43, and is configured to receive the first direct current voltage signal, and generate a second direct current voltage signal according to the first direct current voltage signal.
In this embodiment, the input current is isolated and coupled by the isolating and coupling unit 41, specifically, the isolating and coupling unit 41 couples the high-frequency current input by the first filament matching circuit 10 and the high-frequency ac input by the second filament matching circuit 30, and a stable dc power is obtained after passing through the second rectifying unit 42, and the linear voltage stabilizing unit 43 generates a first dc voltage signal based on the dc power. The first dc voltage signal is output to the relay unit 44 to supply power to the coil of the relay U1 in the relay unit 44, and when the first dc voltage signal connected to the coil of the relay U1 reaches a preset voltage threshold, for example, the voltage of the first dc voltage signal is 9V, the relay switch is driven to be attracted, so as to form a leakage protection working circuit, and at this time, the two groups of lamp wires are isolated by the relay U1.
Furthermore, in this embodiment, the isolation coupling unit 41 is further configured to perform capacitance compensation, and after the relay switch in the relay unit 44 is attracted, the high-frequency ac is coupled to provide a stable voltage to the relay unit 44, so that the situation that the voltage of the driver unit is too low to keep the voltage when the lamp tube is compatible with different ECGs is avoided, when any group of lamp wires are in poor contact, the circuit does not work, the risk of leakage during installation does not exist, and the IEC62776 safety certification standard is satisfied.
In one embodiment, referring to fig. 4, the temperature detection circuit 50 includes a resistance unit 51 and a thermistor unit 52, wherein the resistance value of the thermistor unit 52 varies with the temperature of the circuit components; the first end of the resistor unit 51 is connected to the power output circuit 20, the second end of the resistor unit 51 and the first end of the thermistor unit 52 are commonly connected to the switch control circuit 60, and the second end of the thermistor unit 52 is grounded.
In this embodiment, the temperature detection circuit 50 is formed by connecting the resistor unit 51 and the thermistor unit 52 in series, at this time, the temperature detection circuit 50 can be used as a voltage dividing circuit for receiving the direct current output by the power output circuit 20 to generate a voltage dividing signal, the voltage dividing signal is the temperature detection signal, when the temperature of the component changes, the resistance of the thermistor unit 52 changes along with the change, at this time, the voltage of the voltage dividing signal changes, and the comparator unit 62 compares the voltage dividing signal with the preset threshold voltage, so as to generate a corresponding comparison signal.
In one embodiment, the thermistor unit 52 may be composed of a PTC thermistor, and the resistance value of the PTC thermistor increases stepwise with an increase in temperature when the temperature reaches a preset threshold temperature. The PTC thermistor has the characteristic of switching instant, and in the embodiment, the PTC thermistor can be selected to start the resistance change at 90-100 ℃, and the resistance of the PTC thermistor cannot be changed below 90 ℃.
In one embodiment, referring to fig. 4, the switch control circuit 60 includes a threshold voltage unit 61, a comparator unit 62, and a control unit 63, where the threshold voltage unit 61 is connected to the contact current protection circuit 40, and is configured to receive a second dc voltage signal and generate a threshold voltage signal according to the second dc voltage signal; the comparator unit 62 is connected to the temperature detection circuit 50 and the threshold voltage unit 61, respectively, and is configured to perform comparison processing on the temperature detection signal and the threshold voltage signal to generate a voltage comparison signal; the control unit 63 is connected to the comparator unit 62 and the switching circuit 70, respectively, for receiving the voltage comparison signal and generating a switching control signal based on the voltage comparison signal.
In one embodiment, the threshold voltage unit 61 is configured to provide a threshold voltage signal according to need, the comparator unit 62 compares the temperature detection signal with the threshold voltage signal, and generates a corresponding voltage comparison signal according to a corresponding comparison result, the switch unit generates a switch control signal according to the voltage comparison signal, for example, when the resistance of the thermistor unit 52 increases, the voltage of the temperature detection signal is greater than the voltage of the threshold voltage signal, the voltage comparison signal is a high level signal, the control unit 63 generates a corresponding switch control signal according to the high level signal to control the switch circuit 70 to turn off, at this time, the light source load 80 is turned off, so as to protect the lamp from being affected, and when the temperature of the component decreases, the resistance of the thermistor unit 52 returns to normal, and the light source load 80 is normally turned on.
In one embodiment, referring to fig. 5, the switch control circuit 60 further includes a coupling current limiting unit 64, where the coupling current limiting unit 64 is connected to the contact current protection circuit 40 for performing coupling current limiting processing on the second dc voltage signal.
In this embodiment, the coupling current limiting unit 64 performs coupling current limiting processing on the second dc voltage signal.
In one embodiment, referring to fig. 5, the switch control circuit 60 further includes a voltage stabilizing unit 65, where the voltage stabilizing unit 65 is connected to the contact current protection circuit 40, the comparator unit 62, and the threshold voltage unit 61, and is configured to perform voltage stabilizing processing on the second dc voltage signal to generate a third dc voltage signal, so as to supply power to the threshold voltage unit 61 and the comparator unit 62.
In this embodiment, the voltage stabilizing unit 65 performs voltage stabilizing processing on the second dc voltage signal, and further, the voltage stabilizing unit 65 eliminates the negative half wave of the high frequency part in the second dc voltage signal, thereby generating a stable third dc voltage signal.
In one embodiment, referring to fig. 6, the first filament matching circuit 10 includes: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first capacitor C1 and the second capacitor C2; the first end of the first resistor R1, the first end of the second resistor R2 and the first end of the first capacitor C1 form a first filament matching circuit 10, the first end of the third resistor R3, the first end of the fourth resistor R4 and the first end of the second capacitor C2 are connected together to form a second end of the first filament matching circuit 10, the second end of the first resistor R1, the second end of the second resistor R2, the second end of the first capacitor C1, the second end of the third resistor R3, the second end of the fourth resistor R4 and the second end of the second capacitor C2 are connected together to form an output end of the first filament matching circuit 10, and the output end of the power output circuit 20 is connected.
In one embodiment, referring to fig. 6, the second filament matching circuit 30 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, and a fourth capacitor C4; the first end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the third resistor R3 are commonly connected to form a second filament matching circuit 30, the first end of the seventh resistor R7, the first end of the eighth resistor R8 and the first end of the fourth capacitor C4 are commonly connected to form a second filament matching circuit 30, the second end of the fifth resistor R5, the second end of the sixth resistor R6, the second end of the third capacitor C3, the second end of the seventh resistor R7, the second end of the eighth resistor R8 and the second end of the fourth capacitor C4 are commonly connected to form a second filament matching circuit 30, and the output end of the fourth capacitor C4 is connected to the contact current protection circuit 40.
In one embodiment, PIN1 and PIN2 can form one group of filaments of the lamp tube, PNI3 and PIN4 can form another group of filaments of the lamp tube, and filament impedance matching is performed by arranging filament matching circuits at two ends of the lamp tube, so that ECG compatibility is enhanced.
In one embodiment, referring to fig. 6, a first temperature fuse HF1 is further provided between the first filament matching circuit 10 and the power output circuit 20, and a second temperature fuse HF2 is further provided between the second filament matching circuit 30 and the contact current protection circuit 40.
In this embodiment, the first thermal fuse HF1 and the second thermal fuse HF2 provide over-temperature protection, so as to prevent the input from being disconnected when the internal temperature of the lamp cap rises to 125 ℃ during overcurrent, and protect the ECG and the LED lamp.
In one embodiment, referring to fig. 6, the first rectifying unit 21 includes: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to the first filament matching circuit 10, the cathode of the first diode D1 and the cathode of the third diode D3 are commonly connected to the light source load 80, the anode of the second diode D2 and the anode of the fourth diode D4 are commonly connected to the ground, and the anode of the third diode D3 and the cathode of the fourth diode D4 are commonly connected to the contact current protection circuit 40.
In the present embodiment, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form bridge rectification to convert high-frequency ac into dc and supply the dc to the light source load 80.
In one embodiment, the AC input to the first filament matching circuit 10 may be in the range of 50-110V and the frequency may be in the range of 25KHz-80KHz AC.
In one embodiment, referring to fig. 6, the resistance unit 51 includes a twentieth resistance R20 and a twenty-first resistance R21; the twentieth resistor R20 has a first end connected to the first rectifying unit 21, the twentieth resistor R20 has a second end connected to the first end of the twenty-first resistor R21, and the twenty-first resistor R21 has a second end connected to the thermistor unit 52.
In one embodiment, referring to fig. 6, the thermistor unit 52 includes: a twenty-second resistor R22, a fourteenth capacitor C14, and a thermistor VR; the first end of the twenty-second resistor R22, the first end of the fourteenth resistor R14, and the first end of the thermistor VR are commonly connected to form a first end of the thermistor unit 52, and the first end of the twenty-second resistor R22, the second end of the fourteenth capacitor C14, and the second end of the thermistor VR are commonly connected to ground, respectively, to the resistor unit 51 and the comparator unit 62.
In this embodiment, the twentieth resistor R20, the twenty-first resistor R21, the twenty-second resistor R22, the fourteenth capacitor C14 and the thermistor VR may form the temperature detection circuit 50, and since the resistance of the thermistor VR changes suddenly with the change of temperature within a certain resistance range, the temperature detection circuit 50 may sample the voltage to achieve the purpose of sampling the temperature.
Furthermore, the voltage division ratio of the sampling resistance value can be calculated according to different serial-parallel numbers of the LED modules of the lamp tube.
In one embodiment, the thermistor VR may be a PTC thermistor, and when the temperature reaches a certain value, the resistance of the thermistor instantaneously increases and the voltage dividing ratio changes.
In one embodiment, referring to fig. 6, the filtering unit 22 includes: a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, and a twentieth capacitor C20; the first end of the fifteenth capacitor C15, the first end of the seventeenth capacitor C17, the first end of the nineteenth capacitor C19 and the first end of the twentieth capacitor C20 are commonly connected to the first rectifying unit 21, the second end of the fifteenth capacitor C15 is connected to the first end of the sixteenth capacitor C16, the second end of the seventeenth capacitor C17 is connected to the first end of the eighteenth capacitor C18, the second end of the sixteenth capacitor C16 and the second end of the eighteenth capacitor C18 are commonly connected to the first end of the switching circuit 70, and the second end of the nineteenth capacitor C19 and the second end of the twentieth capacitor C20 are commonly connected to the second end of the switching circuit 70.
In one embodiment, referring to fig. 6, the load discharging unit 23 includes a twenty-third resistor R23 and a twenty-fourth resistor R24, a first end of the twenty-third resistor R23 forming a first end of the load discharging unit 23 is connected to the first rectifying unit 21 and the positive end of the light source load 80, a second end of the twenty-third resistor R23 is connected to a first end of the twenty-fourth resistor R24, and a second end of the twenty-fourth resistor R24 forming a second end of the load discharging unit 23 is connected to a second end of the switching circuit 70 and the negative end of the light source load 80, respectively.
In the embodiment, the two resistors are connected in series to serve as the load discharge resistor, so that the discharge resistor is prevented from being damaged due to the fact that the ECG open circuit voltage is too high when the production test is used.
In one embodiment, referring to fig. 6, the isolation coupling unit 41 includes a fifth capacitor C5 and a sixth capacitor C6; the first end of the fifth capacitor C5 is connected to the second filament matching circuit 30, the second end of the fifth capacitor C5 and the first end of the sixth capacitor C6 are commonly connected to the second rectifying unit 42, and the second end of the sixth capacitor C6 is connected to the first rectifying unit 21.
In one embodiment, the fifth capacitor C5 and the sixth capacitor C6 may be safety capacitors.
Furthermore, the model of the safety capacitor can be CY1-152/400V, and an isolation coupling circuit is formed by a fifth capacitor C5 and a sixth capacitor C6, so that high-frequency alternating current input by the two street lamp wire matching circuits is subjected to isolation coupling treatment.
In one embodiment, referring to fig. 6, the fifth capacitor C5 may also be connected to the second filament matching circuit 30 through a second temperature fuse HF2.
In one embodiment, referring to fig. 6, the second rectifying unit 42 may be a rectifying bridge DB, a first input terminal of the rectifying bridge DB is connected to the isolation coupling unit 41, a second input terminal of the rectifying bridge DB is connected to the first filament matching circuit 10, a first output terminal of the rectifying bridge DB is connected to the linear voltage stabilizing unit 43, and a second output terminal of the rectifying bridge DB is grounded.
In one embodiment, referring to fig. 6, the linear voltage stabilizing unit 43 includes: a seventh capacitor C7, a ninth resistor R9, a first voltage regulator Z1, an eighth capacitor C8, a ninth capacitor C9, a ninth resistor R9, a tenth resistor R10, a twenty-fifth resistor R25, and a first switching tube Q1; the first end of the seventh capacitor C7, the first point of the ninth resistor R9 and the first end of the twenty-fifth resistor R25 are commonly connected to the second rectifying unit 42, the second end of the ninth resistor R9, the cathode of the first voltage stabilizing tube Z1, the first end of the eighth capacitor C8, the first end of the tenth resistor R10 and the control end of the first switching tube Q1 are commonly connected, the current input end of the first switching tube Q1 is connected to the second end of the twenty-fifth resistor R25, the current output end of the first switching tube Q1 and the first end of the ninth capacitor C9 are commonly connected to the first coil end of the relay unit 44, and the second end of the seventh capacitor C7, the anode of the first voltage stabilizing tube Z1, the second end of the eighth capacitor C8, the second end of the tenth resistor R10 and the second end of the ninth capacitor C9 are commonly connected to ground.
In one embodiment, the first switching transistor Q1 may be an N-type MOS transistor.
In one embodiment, referring to fig. 6, the relay unit 44 includes a relay U1; the coil of the relay U1 is connected to the linear voltage stabilizing unit 43, the relay switch input is connected to the second filament matching circuit 30, and the relay switch output is connected to the coupling current limiting unit 64.
In one embodiment, referring to fig. 6, the coupling current limiting unit 64 includes a tenth capacitor C10 and an eleventh resistor R11; the first end relay unit 44 of the tenth capacitor C10 is connected, the second end of the tenth capacitor C10 is connected to the first end of the eleventh resistor R11, and the second end of the eleventh resistor R11 is connected to the voltage stabilizing unit 65.
In one embodiment, referring to fig. 6, the voltage stabilizing unit 65 includes: a fifth diode D5, a sixth diode D6, a twelfth resistor D12, an eleventh capacitor C11, a thirteenth resistor R13, and a second voltage regulator Z2; the cathode of the fifth diode D5 and the anode of the sixth diode D6 are commonly connected to the coupling current limiting unit 64, the cathode of the sixth diode D6, the first end of the twelfth resistor D12, the first end of the eleventh capacitor C11 and the first end of the thirteenth resistor R13 are commonly connected to the control unit 63, the second end of the thirteenth resistor R13 and the cathode of the second voltage regulator tube Z2 form an output end of the voltage regulator unit 65, which is respectively connected to the comparator unit 62 and the threshold voltage unit 61, and the anode of the fifth diode D5, the second end of the twelfth resistor D12, the second end of the eleventh capacitor C11 and the anode of the second voltage regulator tube Z2 are commonly connected to the ground.
In one embodiment, the fifth diode D5 and the sixth diode D6 remove the negative half wave of the high frequency part of the input current signal by clamping, and further, filter the input current signal through the eleventh capacitor C11 and the twelfth resistor D12, thereby outputting a stable third direct current voltage signal to supply power to the threshold voltage unit 61 and the comparator unit 62.
In one embodiment, referring to fig. 6, the threshold voltage unit 61 includes: a twelfth capacitor C12, a fourteenth resistor R14, a thirteenth capacitor C13, a controllable precision voltage regulator U2, a fifteenth resistor R15, and a sixteenth resistor R16; the first end of the fourteenth resistor R14, the first end of the twelfth capacitor C12, and the first end of the fifteenth resistor R15 are commonly connected to the comparator unit 62, the second end of the fifteenth resistor R15, the first end of the sixteenth resistor R16, the first end of the thirteenth capacitor C13, the control end of the controllable precision voltage regulator U2, and the output end of the controllable precision voltage regulator U2 are commonly connected, the second end of the sixteenth resistor R16 is connected to the voltage stabilizing unit 65, and the second end of the thirteenth capacitor C13, the input end of the controllable precision voltage regulator U2, the second end of the twelfth capacitor C12, and the second end of the fourteenth resistor R14 are commonly connected.
In one embodiment, referring to fig. 6, the comparator unit 62 may include an operational amplifier U3, a power supply terminal of the operational amplifier U3 is connected to the voltage stabilizing unit 65, an inverting input terminal of the operational amplifier U3 is connected to the threshold voltage unit 61, a non-inverting input terminal of the operational amplifier U3 is connected to the temperature detecting circuit 50, a ground terminal of the operational amplifier U3 is grounded, and an output terminal of the operational amplifier U3 is connected to the control unit 63.
In one embodiment, referring to fig. 6, the control unit 63 includes: a second switching tube Q2, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty sixth resistor R26, a twenty seventh resistor R27, a third switching tube Q3, and a fifth switching tube Q5; the control end of the third switching tube Q3 is connected to the first end of the seventeenth resistor R17, the second end of the seventeenth resistor R17 and the first end of the twenty-sixth resistor R26 are commonly connected to the comparator unit 62, the first end of the third switching tube Q3, the first end of the eighteenth resistor R18 and the control end of the second switching tube Q2 are commonly connected to the ground, the first end of the second switching tube Q2 and the second end of the eighteenth resistor R18 are commonly connected to the voltage stabilizing unit 65, the second end of the second switching tube Q2 is connected to the first end of the nineteenth resistor R19, the second end of the nineteenth resistor R19 and the first end of the fifth switching tube Q5 are commonly connected to the switching circuit 70, the second end of the fifth switching tube Q5 and the first end of the twenty-seventh resistor R27 are commonly connected to the ground, and the control end of the twenty-sixth resistor R26 and the second end of the twenty-seventh resistor R27 are commonly connected to the ground.
In this embodiment, when the temperature of the thermistor VR detecting element is up to 100-120 ℃, the resistance of the thermistor VR rises instantaneously, the voltage division ratio output by the thermistor unit 52 also rises at this time, when the voltage division ratio of the thermistor VR exceeds the voltage division ratio provided by the threshold voltage unit 61, the operational amplifier in the comparator unit 62 outputs a high level to drive the third switching tube Q3 to be turned on, at this time, the second switching tube Q2 is turned off, and meanwhile, since the high level signal output by the comparator unit 62 is output to the control end of the fifth switching tube Q5, the fifth switching tube Q5 is turned on, the voltage of the control end of the fourth switching tube Q4 is pulled down, the fourth switching tube Q4 is turned off, the output load is turned off, and the lamp is not turned on.
Further, in this embodiment, since the ECG (electronic ballast) itself has an open circuit detection protection, when the load output is open circuit, a detection signal is sent out twice to determine. When the LED module (namely the light source load 80) flashes twice, the ECG is automatically turned off, the power is needed to be turned on again, the whole protection process is completed, the lamp tube is not damaged, and the lamp tube can be normally lightened after the thermistor is recovered to be normal.
In one embodiment, the third switching tube Q3 is an N-type MOS tube.
In one embodiment, the second switching transistor Q2 is an N-type MOS transistor.
In one embodiment, the switching circuit 70 includes a fourth switching tube Q4, where a control end of the fourth switching tube Q4 is connected to the control unit 63, a first end of the fourth switching tube Q4 is connected to the light source load 80, and a second end of the fourth switching tube Q4 is grounded.
In one embodiment, the fourth switching tube Q4 is an N-type MOS tube.
In this embodiment, during normal operation, the fourth switching tube Q4 is in a normally-on state, the second switching tube Q2, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19 and the third switching tube Q3 form the control unit 63 to control the switching state of the fourth switching tube Q4, for example, when the operational amplifier U3 outputs a low-level signal, the third switching tube Q3 is turned off, the second switching tube Q2 is turned on, at this time, the control end of the fourth switching tube Q4 is at a high level, the fourth switching tube Q4 is turned on, and the circuit normally operates.
When the temperature of the PTC thermistor detection components in the temperature detection circuit 50 is up to 100 ℃, the resistance value of the PTC thermistor rises instantaneously, the voltage division ratio also rises, that is, the voltage of the temperature detection signal rises, when the voltage division ratio of the PTC thermistor exceeds the preset threshold voltage provided by the threshold voltage unit 61, the operational amplifier U3 outputs a high level, the third switching tube Q3 is turned on, the second switching tube Q2 is turned off, the fourth switching tube Q4 is also in an off state, the driving voltage of the fourth switching tube Q4 is directly pulled to the ground, the output load is turned off, and the light source load 80 is turned off.
In this embodiment, the ECG itself has open circuit detection protection, and when the load output is open circuit, the ECG will send out two detection signals to determine, and at this time, the light source load 80, i.e. the LED module blinks twice to automatically turn off the ECG. The ECG needs to be electrified again to start up, the whole protection process is completed, the lamp tube is not damaged, and the lamp tube can be normally lightened after the PTC thermistor is recovered to be normal.
The embodiment of the application also provides a lamp driving device, which comprises the lamp driving circuit of any one of the above.
The embodiment of the application also provides a lamp tube, which comprises: a light source load 80; and a lamp driving circuit as claimed in any one of the above, the lamp driving circuit being connected to the light source load 80.
In this embodiment, the light source load 80 may be composed of a plurality of light emitting diodes connected in series or in parallel.
The embodiment of the application provides a lamp tube driving circuit, a lamp tube driving device and a lamp tube, impedance matching is carried out through a first filament matching circuit and a second filament matching circuit, a contact current protection circuit is adopted to generate a second direct current voltage signal according to alternating current, a temperature detection circuit is adopted to detect the temperature of circuit components and generate a temperature detection signal, a switch control circuit is adopted to generate a switch control signal according to the temperature detection signal and the second direct current voltage signal, the switch circuit is conducted or turned off according to the switch control signal, so that the connection state between a power output circuit and a light source load is controlled, and therefore power output is turned off in time when the lamp tube is leaked or the temperature is too high, the problem that an electronic ballast (ECG) lamp tube cannot provide protection when the leakage or the temperature is too high is solved, and potential safety hazards exist.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (7)
1. A lamp driving circuit connected to a light source load, the lamp driving circuit comprising:
the first filament matching circuit is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a first end and a second end of the electronic ballast;
the power output circuit is connected with the first filament matching circuit and is used for receiving the alternating current and converting the alternating current into direct current so as to drive the light source load to be lightened;
the second filament matching circuit is used for forwarding alternating current provided by the electronic ballast and matching filament impedance between a third end and a fourth end of the electronic ballast;
the contact current protection circuit is respectively connected with the first filament matching circuit and the second filament matching circuit and is used for receiving the alternating current and generating a second direct current voltage signal according to the alternating current;
the temperature detection circuit is connected with the power output circuit and is used for detecting the temperature of the circuit components and generating a temperature detection signal according to the detection result;
the switch control circuit is connected with the contact current protection circuit and the temperature detection circuit and is used for receiving the temperature detection signal and the second direct-current voltage signal and generating a switch control signal according to the temperature detection signal and the second direct-current voltage signal; and
the switch circuit is respectively connected with the power output circuit, the switch control circuit and the light source load, and is used for receiving the switch control signal and switching on or off according to the switch control signal so as to control the connection state between the power output circuit and the light source load;
the switch control circuit includes:
the threshold voltage unit is connected with the contact current protection circuit and is used for receiving the second direct-current voltage signal and generating a threshold voltage signal according to the second direct-current voltage signal;
the comparator unit is respectively connected with the temperature detection circuit and the threshold voltage unit and is used for comparing the temperature detection signal with the threshold voltage signal to generate a voltage comparison signal; and
the control unit is respectively connected with the comparator unit and the switch circuit and is used for receiving the voltage comparison signal and generating the switch control signal according to the voltage comparison signal;
the coupling current limiting unit is connected with the contact current protection circuit and is used for carrying out coupling current limiting treatment on the second direct-current voltage signal;
the voltage stabilizing unit is respectively connected with the contact current protection circuit, the comparator unit and the threshold voltage unit and is used for carrying out voltage stabilizing treatment on the second direct-current voltage signal to generate a third direct-current voltage signal so as to supply power to the threshold voltage unit and the comparator unit;
the control unit includes: a second switching tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a third switching tube and a fifth switching tube; the control end of the third switching tube is connected with the first end of the seventeenth resistor, the second end of the seventeenth resistor and the first end of the twenty-sixth resistor are connected with the comparator unit in a sharing mode, the first end of the third switching tube, the first end of the eighteenth resistor and the control end of the second switching tube are connected with the ground in a sharing mode, the first end of the second switching tube and the second end of the eighteenth resistor are connected with the voltage stabilizing unit in a sharing mode, the second end of the second switching tube is connected with the first end of the nineteenth resistor, the second end of the nineteenth resistor and the first end of the fifth switching tube are connected with the switching circuit in a sharing mode, the second end of the fifth switching tube and the first end of the twenty-seventh resistor are connected with the ground in a sharing mode, and the control end of the fifth switching tube, the second end of the twenty-sixth resistor and the second end of the twenty-seventh resistor are connected in a sharing mode.
2. The lamp driving circuit as claimed in claim 1, wherein the power output circuit comprises:
the first rectifying unit is connected with the first filament matching circuit and is used for receiving the alternating current and converting the alternating current into direct current;
and the filtering unit is connected with the first rectifying unit and is used for filtering the direct current.
3. The lamp driving circuit as claimed in claim 2, wherein the power output circuit further comprises:
and the load discharging unit is respectively connected with the filtering unit and the light source load and is used for providing discharge protection for the light source load.
4. The lamp driving circuit as claimed in claim 1, wherein the contact current protection circuit comprises:
the isolation coupling unit is connected with the first filament matching circuit and the second filament matching circuit respectively and is used for carrying out isolation coupling treatment on the alternating current;
the second rectifying unit is connected with the isolation coupling unit and is used for converting the alternating current into direct current;
the linear voltage stabilizing unit is connected with the second rectifying unit and is used for receiving the direct current and generating a first direct current voltage signal according to the direct current; and
and the relay unit is connected with the linear voltage stabilizing unit and is used for receiving the first direct-current voltage signal and generating the second direct-current voltage signal according to the first direct-current voltage signal.
5. The lamp driving circuit as claimed in claim 1, wherein the temperature detecting circuit comprises: the resistance value of the thermistor unit changes along with the temperature change of the circuit component;
the first end of the resistor unit is connected with the power output circuit, the second end of the resistor unit and the first end of the thermistor unit are commonly connected with the switch control circuit, and the second end of the thermistor unit is grounded.
6. A lamp driving device, characterized in that the lamp driving device comprises a lamp driving circuit as claimed in any one of claims 1-5.
7. A lamp tube, the lamp tube comprising:
a light source load; and
the lamp driving circuit of any one of claims 1-5, wherein the lamp driving circuit is coupled to the light source load.
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| CN202010423221.5A CN111556636B (en) | 2020-05-19 | 2020-05-19 | Lamp tube driving circuit, lamp tube driving device and lamp tube |
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| CN202010423221.5A CN111556636B (en) | 2020-05-19 | 2020-05-19 | Lamp tube driving circuit, lamp tube driving device and lamp tube |
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| CN112188683B (en) * | 2020-09-27 | 2025-03-11 | 漳州立达信光电子科技有限公司 | LED driving circuit and LED lamp |
| WO2022099483A1 (en) * | 2020-11-10 | 2022-05-19 | 深圳市豪恩智能物联股份有限公司 | Illumination driver power source circuit, illumination driver apparatus, and lamp tube |
| CN118777934A (en) * | 2024-09-10 | 2024-10-15 | 希格玛电气(珠海)有限公司 | An intelligent electrical control system |
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