CN219329611U - Overvoltage protection circuit and lighting lamp - Google Patents
Overvoltage protection circuit and lighting lamp Download PDFInfo
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- CN219329611U CN219329611U CN202223503012.5U CN202223503012U CN219329611U CN 219329611 U CN219329611 U CN 219329611U CN 202223503012 U CN202223503012 U CN 202223503012U CN 219329611 U CN219329611 U CN 219329611U
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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
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model relates to the technical field of converters and provides an overvoltage protection circuit and a lighting lamp. The voltage dividing circuit is connected with the positive electrode output end of the rectifier bridge, the comparison circuit is connected with the voltage dividing circuit, the first end of the switching tube is grounded, the second end of the switching tube is connected with the control end of the switching element, and the switching element is connected between the negative electrode output end of the rectifier bridge and the transformer. When the first voltage at the positive electrode output end of the rectifier bridge is larger than a preset value, the voltage dividing circuit divides the first voltage and then outputs a second voltage to the comparison circuit, so that the comparison circuit outputs a corresponding level signal to control the switching tube to be turned on or off, and further control the switching element to cut off the connection between the negative electrode output end of the rectifier bridge and the transformer. The utility model avoids damage or failure of components of the converter caused by overvoltage and damage of electric equipment such as lighting lamps and the like, and eliminates potential safety hazards.
Description
Technical Field
The utility model relates to the technical field of converters, in particular to an overvoltage protection circuit and a lighting lamp.
Background
A transducer is a device that converts information from a source for a given purpose. The ac-dc converter is a device for converting ac power whose voltage and current direction are alternately changed between positive and negative directions into dc power whose current direction is constant by means of a rectifier, a filter, and a transformer, and for maintaining a constant current in a circuit.
In the process of converting alternating current by the converter, when the input voltage of the converter is increased, the input voltage of the filter is increased, the risk of breakdown of the filter capacitor is generated when the input voltage exceeds the rated voltage of the filter, meanwhile, the voltage of the transformer connected with the output end of the rectifier is increased correspondingly, and the transformer is damaged or fails due to overlarge voltage, and even electric equipment is damaged. For example, if a dc power supply with a rated input voltage of 90V-305V ac is connected to a power supply system with a higher voltage (for example, a 480V ac industrial power grid) by mistake, the filter capacitor is broken down, the transformer is damaged or disabled, and even the electric equipment is burned out. In addition, the highest output voltage of the converter with the non-isolated power output of the boost+buck architecture is generally the output voltage of PFC (Power Factor Correction ), for example, the input voltage is 90V-305V ac, and the highest output voltage of the converter with the non-isolated power output of the boost+buck architecture is generally the output voltage of PFC (Power Factor Correction ), that is, about 460V. When circuit breaking occurs in the output loop of the converter, 460V voltage is applied to two ends of the circuit breaking position, so that arcing occurs, carbonization or even ignition of the circuit breaking position is caused, and potential safety hazards are generated.
In summary, the existing converter may cause damage or failure of components of the converter and damage of electric equipment when the input voltage is higher. In addition, when the output loop of the converter is broken, an arc discharge phenomenon occurs, so that potential safety hazards are generated.
Disclosure of Invention
The utility model provides an overvoltage protection circuit and a lighting lamp, which are used for solving the defects that in the prior art, components of a converter are damaged or lose efficacy due to higher input voltage, electric equipment is damaged, and potential safety hazards generated when an output loop of the converter is broken are overcome, protecting the components of the converter and the electric equipment is realized, and the potential safety hazards generated when the output loop of the converter is broken are eliminated.
The utility model discloses an overvoltage protection circuit which is applied to a converter, wherein the converter comprises a rectifier bridge, a first capacitor connected between positive and negative output ends of the rectifier bridge, and a transformer connected with the positive and negative output ends of the rectifier bridge, and the overvoltage protection circuit comprises a voltage dividing circuit, a comparison circuit, a switching tube and a switching element;
the voltage dividing circuit is connected with the positive electrode output end of the rectifier bridge, the voltage dividing circuit is grounded, the comparison circuit is connected with the voltage dividing circuit, the first end of the switching tube is grounded, the second end of the switching tube is connected with the control end of the switching element, and the switching element is connected between the negative electrode output end of the rectifier bridge and the transformer;
when the first voltage at the positive electrode output end of the rectifier bridge is larger than a preset value, the voltage dividing circuit divides the first voltage and then outputs a second voltage to the comparison circuit, so that the comparison circuit outputs a corresponding level signal to control the switching tube to be turned on or off, and further control the switching element to cut off the connection between the negative electrode output end of the rectifier bridge and the transformer.
According to the overvoltage protection circuit provided by the utility model, the voltage dividing circuit comprises a first resistor, a second resistor and a second capacitor, one end of the first resistor is connected with one end of the positive electrode output end of the rectifier bridge and one end of the second capacitor, the other end of the first resistor is connected with one end of the second resistor and the comparison circuit, and the other end of the second resistor is grounded.
According to the utility model, the comparison circuit comprises a comparator and a third resistor, wherein a first input end of the comparator is connected with the voltage dividing circuit, a second input end of the comparator is connected with one end of the third resistor, the other end of the third resistor is connected with a positive power supply end of the comparator and is used for being connected with an external power supply, and a negative power supply end of the comparator is grounded.
According to the utility model, the comparison circuit further comprises a controllable voltage stabilizing source, wherein the cathode and the reference electrode of the controllable voltage stabilizing source are connected with the second input end of the comparator, and the anode is grounded.
According to the utility model, the comparison circuit further comprises a fourth resistor, one end of the fourth resistor is connected with the other end of the third resistor, and the other end of the fourth resistor is connected with the control end of the switching element.
According to the overvoltage protection circuit provided by the utility model, the switching element is an N-channel MOS tube, the grid electrode of the N-channel MOS tube is a control end, the source electrode is connected with the negative electrode output end of the rectifier bridge, and the drain electrode is connected with the transformer.
According to the utility model, the overvoltage protection circuit further comprises a diode, wherein the positive electrode of the diode is connected with the positive electrode output end of the rectifier bridge, and the negative electrode of the diode is connected with the voltage dividing circuit.
According to the utility model, the overvoltage protection circuit further comprises a voltage stabilizing tube, wherein the cathode of the voltage stabilizing tube is connected with the comparison circuit and the voltage dividing circuit, and the other end of the voltage stabilizing tube is grounded.
According to the present utility model, there is provided an overvoltage protection circuit applied to an illumination driving circuit including the inverter, the overvoltage protection circuit being connected to the inverter of the illumination driving circuit
The utility model also provides a lighting fixture comprising:
the base and the optical element are arranged on the base, an accommodating space is formed by encircling the base and the optical element, a circuit board and a light source are arranged in the accommodating space, the overvoltage protection circuit is arranged on the circuit board, the overvoltage protection circuit is connected with the converter, and the output end of the converter is connected with the light source.
According to the overvoltage protection circuit, when the input voltage of the rectifier bridge is large, the voltage division circuit divides the first voltage which is larger than the preset value and then outputs the second voltage, the comparison circuit outputs the corresponding level signal according to the second voltage, and then the switching tube is used for controlling the switching element to cut off the connection between the negative electrode output end of the rectifier bridge and the transformer, so that damage or failure of components of the converter and damage of electric equipment such as a lighting lamp due to overvoltage are avoided. In addition, when the output loop of the converter is broken, the voltage at the broken position is increased, so that the voltage at the primary side of the transformer is increased, the voltage at the positive output end of the rectifier bridge is increased, and then the overvoltage protection circuit cuts off the connection between the negative output end of the rectifier bridge and the transformer, so that the transformer has no voltage output, the occurrence of arcing phenomenon is avoided, and the potential safety hazard is eliminated.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an overvoltage protection circuit provided by the present utility model;
fig. 2 is a circuit diagram of an overvoltage protection circuit provided by the utility model.
Reference numerals:
110. a voltage dividing circuit; 120. a comparison circuit; 130. a switching element; 40. a transformer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The overvoltage protection circuit and the lighting fixture of the present utility model are described below with reference to fig. 1 to 2.
In one embodiment, as shown in fig. 1, an overvoltage protection circuit is applied to a converter, where the converter includes a rectifier bridge B, a first capacitor C1 connected between positive and negative output terminals of the rectifier bridge B, and a transformer 40 connected to the positive and negative output terminals of the rectifier bridge B. The overvoltage protection circuit includes a voltage divider 110, a comparator 120, a switching tube Q1 and a switching element 130.
The voltage dividing circuit 110 is connected with the positive electrode output end of the rectifier bridge B, and the voltage dividing circuit 110 is grounded. The comparison circuit 120 is connected to the voltage dividing circuit 110 and the first end of the switching tube Q1. The second terminal of the switching tube Q1 is grounded, and the third terminal is connected to the control terminal of the switching element 130. The switching element 130 is connected between the negative output terminal of the rectifier bridge B and the transformer 40.
Specifically, the rectifier bridge B rectifies the input ac to output dc, the voltage divider 110 divides the dc, the comparator 120 receives the divided voltage output by the voltage divider 110 and outputs a corresponding level signal according to the divided voltage, the first end of the switching tube Q1 receives the level signal and controls the on or off between the second end and the third end according to the level signal, so as to ground or isolate the control end of the switching element 130.
When the first voltage at the positive output end of the rectifier bridge B is greater than a preset value, the voltage dividing circuit 110 divides the first voltage and then outputs a second voltage to the comparison circuit 120, so that the comparison circuit 120 outputs a corresponding level signal to control the switching tube Q1 to be turned on or off, and further control the switching element 130 to cut off the connection between the negative output end of the rectifier bridge B and the transformer 40.
Specifically, when the input voltage of the rectifier bridge B is less than or equal to the rated voltage, the output voltage of the positive output terminal of the rectifier bridge B, that is, the first voltage is less than the preset value, and the second voltage output by the voltage dividing circuit 110 after dividing the first voltage makes the output level signal of the comparing circuit 120 control the switching tube Q1 to be in a state capable of controlling the switching element 130 to be turned on. When the input voltage of the rectifier bridge B is too large, the output voltage of the rectifier bridge B is also increased, so that the output voltage of the positive output end of the rectifier bridge B, that is, the first voltage is also increased, when the first voltage is greater than the preset value, the voltage dividing circuit 110 divides the first voltage to output the second voltage, so that the level signal of the output of the comparing circuit 120 is changed, and the on-off of the switching tube Q1 is further changed, so that the switching element 130 is controlled to cut off the connection between the negative output end of the rectifier bridge B and the transformer 40.
In the overvoltage protection circuit of this embodiment, when the input voltage of the rectifier bridge B is greater, the voltage dividing circuit 110 divides the first voltage greater than the preset value and outputs the second voltage, and the comparison circuit 120 outputs a corresponding level signal according to the second voltage, so that the switching element 130 is controlled by the switching tube Q1 to cut off the connection between the output end of the negative electrode of the rectifier bridge B and the transformer 40, thereby avoiding damage or failure of components of the converter and damage of the electric equipment caused by overvoltage. In addition, when the output loop of the converter is broken, the voltage at the broken position is increased, so that the voltage at the primary side of the transformer 40 is increased, the voltage at the positive output end of the rectifier bridge B is increased, and then the overvoltage protection circuit cuts off the connection between the negative output end of the rectifier bridge B and the transformer 40, so that the transformer 40 has no voltage output, the occurrence of arcing phenomenon is avoided, and the potential safety hazard is eliminated.
As shown in fig. 2, in one embodiment, the voltage dividing circuit 110 includes a first resistor R1, a second resistor R2, and a second capacitor C2, wherein one end of the first resistor R1 is connected to the positive output end of the rectifier bridge B and one end of the second capacitor C2, the other end is connected to one end of the second resistor R2 and the comparison circuit 120, and the other end of the second resistor R2 is grounded.
The second capacitor C2 is a filter capacitor.
Specifically, the first resistor R1 is connected to the second resistor R2 and then grounded, so that the positive output end of the rectifier bridge B forms a current loop with the first resistor R1 and the second resistor R2, and therefore, the first voltage output by the positive output end of the rectifier bridge B is subjected to voltage drop through the first resistor R1 to form a second voltage, and the second voltage is filtered by the second capacitor C2 and then is supplied to the comparison circuit 120.
In this embodiment, the comparing circuit 120 includes a comparator U3 and a third resistor R3, a first input end of the comparator U3 is connected to the voltage dividing circuit 110, a second input end of the comparator U3 is connected to one end of the third resistor R3, another end of the third resistor R3 is connected to a positive power supply end of the comparator U3, and is used to connect to an external power supply U1, and a negative power supply end of the comparator U3 is grounded.
Specifically, the external power supply U1 provides a reference voltage to the second end of the comparator U3 through the third resistor R3, when the second voltage output by the voltage dividing circuit 110 is greater than the reference voltage, the comparator U3 outputs a level signal corresponding to the first input end, and when the second voltage output by the voltage dividing circuit 110 is less than the reference voltage, the comparator U3 outputs a level signal corresponding to the second input end.
The comparison circuit 120 further includes a controllable voltage stabilizing source U2, where a cathode and a reference electrode of the controllable voltage stabilizing source U2 are connected to a second input terminal of the comparator U3, and an anode is grounded.
The cathode of the controllable voltage stabilizing source U2 is connected to the second input end of the comparator U3 and one end of the third resistor R3, so that when the voltage of the external power supply U1 is greater than or equal to the voltage of the internal reference voltage source of the controllable voltage stabilizing source U2, the reference voltage of the second input end of the comparator U3 is kept stable at a fixed value, that is, the voltage value of the internal reference voltage source of the controllable voltage stabilizing source U2 is stabilized.
The comparison circuit 120 further includes a fourth resistor R4, where one end of the fourth resistor R4 is connected to the other end of the third resistor R3, and the other end is connected to the control end of the switching element 130.
The external power supply U1 supplies power to the control terminal of the switching element 130 through the fourth resistor R4, so that the switching element 130 is in a conducting state when the first voltage at the positive output terminal of the rectifier bridge B detected by the protection circuit is not over-voltage.
According to the overvoltage protection circuit of the embodiment, through connection and cooperation of the external power supply U1 and the third resistor R3 with the controllable voltage stabilizing source U2, when the voltage of the external power supply U1 is greater than or equal to the voltage of an internal reference voltage source of the controllable voltage stabilizing source U2, the reference voltage of the second input end of the comparator U3 is kept stable at a fixed value, and the voltage of the external power supply U1 can be reduced to reduce the reference voltage of the second input end of the comparator U3, so that the voltage of the first input end of the comparator U3 is greater than the reference voltage, and the switching-off element 130 is controlled through the switching tube Q1.
As shown in fig. 2, in one embodiment, the switching element 130 is an N-channel MOS transistor, the gate of the N-channel MOS transistor is a control terminal, the source is connected to the negative output terminal of the rectifier bridge B, and the drain is connected to the transformer 40. The output end of the cathode of the rectifier bridge B is grounded.
The N-channel MOS tube is connected to the output end of the cathode of the rectifier bridge B, so that the grid electrode of the N-channel MOS tube can be driven under a smaller voltage. The output end of the cathode of the rectifier bridge B is grounded, so that the output end of the cathode of the rectifier bridge B is grounded when the N-channel MOS tube is turned off.
The overvoltage protection circuit further comprises a diode D1 and a voltage stabilizing tube ZD, wherein the anode of the diode D1 is connected with the anode output end of the rectifier bridge B, and the cathode of the diode D1 is connected with the voltage dividing circuit 110. The cathode of the voltage stabilizing tube ZD is connected with the comparing circuit 120 and the voltage dividing circuit 110, and the other end is grounded.
The diode D1 makes the first voltage at the positive output end of the rectifier bridge B enter the voltage dividing circuit 110 only with the forward voltage, and the voltage stabilizing tube ZD can keep the voltage input into the comparing circuit 120 stable at the rated voltage value of the voltage stabilizing tube ZD when the second voltage output from the voltage dividing circuit 110 is too large, so as to avoid the impact or even damage to the comparator U3 caused by the too large second voltage.
In one embodiment, the overvoltage protection circuit is applied to a lighting drive circuit, the lighting drive circuit including a converter, the overvoltage protection circuit being connected to the converter of the lighting drive circuit.
The embodiment of the utility model also provides a lighting lamp, which comprises: a base, an optical element, a circuit board, a transducer, and an overvoltage protection circuit as shown in fig. 1.
The base and the optical element enclose to form a containing space, the circuit board and the light source are arranged in the containing space, an overvoltage protection circuit is arranged on the circuit board and connected with the converter, and the output end of the converter is connected with the light source.
In the lighting fixture of the embodiment, when the input voltage of the rectifier bridge B is larger, the voltage dividing circuit 110 divides the first voltage larger than the preset value and outputs the second voltage, the comparison circuit 120 outputs a corresponding level signal according to the second voltage, and then the switching element 130 is controlled by the switching tube Q1 to cut off the connection between the negative output end of the rectifier bridge B and the transformer 40, so that damage or failure of components of the converter caused by overvoltage and damage of the lighting fixture are avoided. In addition, when the output loop of the converter is broken, the voltage at the broken position is increased, so that the voltage at the primary side of the transformer 40 is increased, the voltage at the positive output end of the rectifier bridge B is increased, and then the overvoltage protection circuit cuts off the connection between the negative output end of the rectifier bridge B and the transformer 40, so that the transformer 40 has no voltage output, the occurrence of arcing phenomenon is avoided, and the potential safety hazard is eliminated.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will 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 utility model.
Claims (10)
1. An overvoltage protection circuit is applied to a converter, and the converter comprises a rectifier bridge, a first capacitor connected between positive and negative output ends of the rectifier bridge, and a transformer (40) connected with the positive and negative output ends of the rectifier bridge, and is characterized by comprising a voltage division circuit (110), a comparison circuit (120), a switching tube and a switching element (130);
the voltage dividing circuit (110) is connected with the positive electrode output end of the rectifier bridge, the voltage dividing circuit (110) is grounded, the comparison circuit (120) is connected with the voltage dividing circuit (110), the first end of the switching tube is grounded, the second end of the switching tube is connected with the control end of the switching element (130), and the switching element (130) is connected between the negative electrode output end of the rectifier bridge and the transformer (40);
when the first voltage at the positive electrode output end of the rectifier bridge is larger than a preset value, the voltage dividing circuit (110) divides the first voltage and then outputs a second voltage to the comparison circuit (120), so that the comparison circuit (120) outputs a corresponding level signal to control the switching tube to be switched on or off, and further control the switching element (130) to cut off the connection between the negative electrode output end of the rectifier bridge and the transformer (40).
2. The overvoltage protection circuit according to claim 1, wherein the voltage divider circuit (110) comprises a first resistor, a second resistor and a second capacitor, one end of the first resistor is connected to one end of the positive output terminal of the rectifier bridge and the second capacitor, the other end is connected to one end of the second resistor and the comparison circuit (120), and the other end of the second resistor is grounded.
3. The overvoltage protection circuit according to claim 1, wherein the comparison circuit (120) comprises a comparator and a third resistor, a first input terminal of the comparator is connected to the voltage dividing circuit (110), a second input terminal is connected to one terminal of the third resistor, the other terminal of the third resistor is connected to a positive power supply terminal of the comparator and is used for being connected to an external power supply, and a negative power supply terminal of the comparator is grounded.
4. The overvoltage protection circuit of claim 3, wherein the comparison circuit (120) further comprises a controllable voltage regulator source having a cathode coupled to the reference electrode at the second input of the comparator and an anode coupled to ground.
5. The overvoltage protection circuit according to claim 4, wherein the comparison circuit (120) further comprises a fourth resistor, one end of the fourth resistor being connected to the other end of the third resistor, the other end being connected to the control terminal of the switching element (130).
6. The overvoltage protection circuit according to claim 1, wherein the switching element (130) is an N-channel MOS transistor, a gate of the N-channel MOS transistor is a control terminal, a source is connected to the negative output terminal of the rectifier bridge, and a drain is connected to the transformer (40).
7. The overvoltage protection circuit according to claim 1, further comprising a diode, the anode of which is connected to the rectifier bridge anode output and the cathode of which is connected to the voltage divider circuit (110).
8. The overvoltage protection circuit according to claim 1, further comprising a voltage regulator tube, wherein a cathode of the voltage regulator tube connects the comparing circuit (120) and the voltage dividing circuit (110), and the other end is grounded.
9. The overvoltage protection circuit according to any one of claims 1 to 8, wherein the overvoltage protection circuit is applied to a lighting drive circuit comprising the inverter, the overvoltage protection circuit being connected to the inverter of the lighting drive circuit.
10. A lighting fixture, comprising:
the base and the optical element are arranged on the base, an accommodating space is formed by surrounding the base and the optical element, a circuit board and a light source are arranged in the accommodating space, the overvoltage protection circuit as claimed in any one of claims 1 to 9 is arranged on the circuit board, the overvoltage protection circuit is connected with the converter, and the output end of the converter is connected with the light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223503012.5U CN219329611U (en) | 2022-12-27 | 2022-12-27 | Overvoltage protection circuit and lighting lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223503012.5U CN219329611U (en) | 2022-12-27 | 2022-12-27 | Overvoltage protection circuit and lighting lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219329611U true CN219329611U (en) | 2023-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223503012.5U Active CN219329611U (en) | 2022-12-27 | 2022-12-27 | Overvoltage protection circuit and lighting lamp |
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| Country | Link |
|---|---|
| CN (1) | CN219329611U (en) |
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- 2022-12-27 CN CN202223503012.5U patent/CN219329611U/en active Active
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