CN209949498U - Protection circuit for limiting maximum output power of voltage conversion circuit - Google Patents
Protection circuit for limiting maximum output power of voltage conversion circuit Download PDFInfo
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- CN209949498U CN209949498U CN201821856437.5U CN201821856437U CN209949498U CN 209949498 U CN209949498 U CN 209949498U CN 201821856437 U CN201821856437 U CN 201821856437U CN 209949498 U CN209949498 U CN 209949498U
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model provides a inject protection circuit of voltage converting circuit maximum power output, including control module and voltage stabilizing module, transformer auxiliary winding is connected to the voltage stabilizing module input, control module's output connection control module's power end, control module's first input passes through current-limiting resistor and connects transformer auxiliary winding, outside adjusting resistor is connected to control module's second input, control module's the external voltage converting circuit's of output control end. The utility model discloses in by the outside voltage transformation circuit of control module butt joint, monitor output voltage and output by protection circuit, dynamic adjustment is by protection circuit's output when reaching the default.
Description
Technical Field
The utility model relates to a protection circuit, in particular to limiting voltage conversion circuit maximum output's protection circuit.
Background
In order to be suitable for wide-range variation of driving output voltage and current, various dimming chips are widely applied, and particularly in the gradual update of the illumination field, control chips with single-stage Buck-boost, fly-back and other topological structures and with low cost and wide voltage and wide current output are more and more. With the improvement of market requirements, customers expect that products can not only meet wide-range changes of driving output voltage and current, but also limit the maximum driving output power for safety consideration and avoid damage caused by the fact that the driving output is mistakenly connected with overhigh voltage.
The utility model discloses a utility model with publication number CN202535039U discloses an overvoltage protection circuit for a LED variable frequency power supply, which comprises an AC-DC conversion circuit for converting AC into DC, a DC-DC power conversion circuit for converting DC, and an LED constant current power supply output circuit for outputting constant current, which are connected in sequence; an input voltage sampling circuit connected to the AC-DC conversion circuit and sampling an input voltage; the input overvoltage judging circuit is connected with the input voltage sampling circuit and is used for judging whether the input voltage is overvoltage or not; the overvoltage protector driving circuit is connected with the input overvoltage judging circuit and outputs an overvoltage protection signal when the input overvoltage judging circuit judges overvoltage; and the PFC control circuit is connected between the overvoltage protector driving circuit and the DC-DC power conversion circuit to correct the power factor and outputs a turn-off signal according to the overvoltage protection signal to turn off the output of the DC-DC power conversion circuit.
The protection circuit in the comparison file has certain protection capability, but the protection process is to directly disconnect the whole circuit when the condition is met, the use limitation of the scheme is large, the sudden power failure easily causes secondary damage to the circuit, and the maintenance is not facilitated.
SUMMERY OF THE UTILITY MODEL
To the poor problem of current protection circuit protection effect, the utility model provides a inject the protection circuit of voltage conversion circuit maximum output power, can dynamic adjustment by protection circuit's output, guarantee the safety of whole circuit.
The technical scheme of the utility model is as follows.
A protection circuit for limiting the maximum output power of a voltage conversion circuit comprises a control module and a voltage stabilizing module, wherein the input end of the voltage stabilizing module is connected with an auxiliary winding of a transformer, the output end of the voltage stabilizing module is connected with the power supply end of the control module, the first input end of the control module is connected with the auxiliary winding of the transformer through a current limiting resistor, the second input end of the control module is connected with an external adjusting resistor, and the output end of the control module is externally connected with the control end of the voltage conversion circuit. The utility model discloses in by the outside voltage conversion circuit of control module butt joint, monitor the output voltage by protection circuit, calculate the real-time output power of voltage conversion circuit through detected voltage and preset current value, through changing PWM signal control voltage conversion circuit when reaching the maximum output power value, reach protection circuit's purpose, wherein the direct influence of adjusting resistance judges the threshold value of excessive pressure.
Furthermore, the control module comprises a control chip US1, a plurality of resistors and a plurality of capacitors, pin No. 1 of the control chip US1 is a first input end of the control module, pin No. 2 of the control chip US1 is grounded, pin No. 3 is grounded through a capacitor CS64, pin No. 4 is grounded through a capacitor CS63, pin No. 4 of the control chip US1 is a power supply end of the control module, pin No. 5 of the control chip US1 is connected with one end of a resistor JR2, the other end of the resistor JR2 is an output end of the control module, pin No. 7 of the control chip US1 is connected with one end of the resistor JR1, and the other end of the resistor JR1 is a second input end of the control module. An auxiliary winding of the transformer obtains a voltage signal after passing through a current-limiting resistor, then a control chip US1 calculates real-time output power according to the voltage signal, the turn ratio of the winding and a preset current value, and then a PMW signal is output from a No. 5 pin to control an external circuit by combining a signal of a No. 7 pin of the control chip US 1.
Further, the voltage stabilizing module comprises a reference voltage source US43, a capacitor CS65 and a plurality of resistors, an output end of the reference voltage source US43 is used as an output end of the voltage stabilizing module, an output end of the reference voltage source US43 is connected with a first end of a current limiting resistor RS47, a second end of the current limiting resistor RS47 is used as an input end of the voltage stabilizing module, an output end of the reference voltage source US43 is connected with an adjusting end of the reference voltage source US43 through a resistor RS48, a low voltage end of the reference voltage source US43 is grounded, and a low voltage end of the reference voltage source US43 is connected with an adjusting end of the reference voltage source US43 through a resistor.
Further, the control chip US1 is STM8S001J 3. The chip of the signal is a common control chip.
The utility model has the advantages that: the output power of the circuit can be adjusted according to the real-time output voltage of the external protected circuit and the preset threshold value, and the effects of limiting the output power and protecting the circuit are achieved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a diagram illustrating an embodiment of the present invention.
Detailed Description
The technical scheme is further explained by combining the drawings in the specification.
Example (b): fig. 1 shows a protection circuit for limiting the maximum output power of a voltage converting circuit, which includes a control module and a voltage stabilizing module, wherein an input terminal of the voltage stabilizing module is connected to an auxiliary winding of a transformer, an output terminal of the voltage stabilizing module is connected to a power supply terminal of the control module, a first input terminal of the control module is connected to the auxiliary winding of the transformer through a current limiting resistor, a second input terminal of the control module is connected to an external regulating resistor, and an output terminal of the control module is externally connected to a control terminal of the voltage converting circuit. In this embodiment, the control module is connected to an external voltage conversion circuit, monitors the output voltage of the protected circuit, calculates the real-time output power of the voltage conversion circuit by detecting the voltage and a preset current value, and controls the voltage conversion circuit by changing the PWM signal when the maximum output power value is reached, so as to achieve the purpose of protecting the circuit, wherein the adjusting resistor directly affects the threshold for determining the overvoltage.
In this embodiment, the control module includes a control chip US1, a plurality of resistors and a plurality of capacitors, pin 1 of the control chip US1 is a first input terminal of the control module, pin 2 of the control chip US1 is grounded, pin 3 is grounded through a capacitor CS64, pin 4 is grounded through a capacitor CS63, pin 4 of the control chip US1 is a power supply terminal of the control module, pin 5 of the control chip US1 is connected with one end of a resistor JR2, the other end of the resistor JR2 is an output terminal of the control module, pin 7 of the control chip US1 is connected with one end of the resistor JR1, and the other end of the resistor JR1 is a second input terminal of the control module. An auxiliary winding of the transformer obtains a voltage signal after passing through a current-limiting resistor, then a control chip US1 calculates real-time output power according to the voltage signal, the turn ratio of the winding and a preset current value, and then a PMW signal is output from a No. 5 pin to control an external circuit by combining a signal of a No. 7 pin of the control chip US 1.
In this embodiment, the voltage stabilizing module includes a reference voltage source US43, a capacitor CS65 and a plurality of resistors, an output terminal of the reference voltage source US43 is used as an output terminal of the voltage stabilizing module, an output terminal of the reference voltage source US43 is connected to a first terminal of a current limiting resistor RS47, a second terminal of the current limiting resistor RS47 is used as an input terminal of the voltage stabilizing module, an output terminal of the reference voltage source US43 is connected to an adjusting terminal of the reference voltage source US43 through a resistor RS48, a low voltage terminal of the reference voltage source US43 is grounded, and a low voltage terminal of the reference voltage source US43 is simultaneously connected to an adjusting terminal of the reference voltage source US 36.
In this embodiment, the control chip US1 is STM8S001J 3. The chip of the signal is a common control chip.
As shown in fig. 2, the protection circuit of this embodiment is applied to a voltage conversion circuit, the PWM signal is output to pin No. 8 of a control chip U31 of the voltage conversion circuit, the second terminal of the resistor JR1 is connected to pin No. 3 of a socket, and a resistor is inserted between pin No. 3 and pin No. 4 of the socket as needed to adjust the REST signal.
The embodiment can adjust the output power of the circuit according to the real-time output voltage of the external protected circuit and the preset threshold value, and plays the roles of limiting the output power and protecting the circuit.
It should be noted that the specific embodiment is only used for further illustration of the technical solution, and is not used for limiting the scope of the technical solution, and any modification, equivalent replacement, improvement and the like based on the technical solution should be considered as being within the protection scope of the present invention.
Claims (4)
1. A protection circuit for limiting the maximum output power of a voltage conversion circuit is characterized by comprising a control module and a voltage stabilizing module, wherein the input end of the voltage stabilizing module is connected with an auxiliary winding of a transformer, the output end of the voltage stabilizing module is connected with the power supply end of the control module, the first input end of the control module is connected with the auxiliary winding of the transformer through a current limiting resistor, the second input end of the control module is connected with an external regulating resistor, and the output end of the control module is externally connected with the control end of the voltage conversion circuit.
2. The protection circuit for limiting the maximum output power of a voltage conversion circuit as claimed in claim 1, wherein the control module comprises a control chip US1, a plurality of resistors and a plurality of capacitors, pin 1 of the control chip US1 is a first input terminal of the control module, pin 2 of the control chip US1 is grounded, pin 3 is grounded through a capacitor CS64, pin 4 is grounded through a capacitor CS63, pin 4 of the control chip US1 is a power supply terminal of the control module, pin 5 of the control chip US1 is connected to one end of a resistor JR2, the other end of the resistor JR2 is an output terminal of the control module, pin 7 of the control chip US1 is connected to one end of the resistor JR1, and the other end of the resistor JR1 is a second input terminal of the control module.
3. The protection circuit for limiting the maximum output power of a voltage converting circuit according to claim 1, wherein the voltage stabilizing module comprises a reference voltage source US43, a capacitor CS65 and a plurality of resistors, the output terminal of the reference voltage source US43 is used as the output terminal of the voltage stabilizing module, the output terminal of the reference voltage source US43 is connected to the first terminal of a current limiting resistor RS47, the second terminal of the current limiting resistor RS47 is the input terminal of the voltage stabilizing module, the output terminal of the reference voltage source US43 is connected to the adjusting terminal of the reference voltage source US43 through a resistor RS48, the low voltage terminal of the reference voltage source US43 is grounded, and the low voltage terminal of the reference voltage source US43 is simultaneously connected to the adjusting terminal of the reference voltage source US43 through a resistor RS 36.
4. A protection circuit for limiting the maximum output power of a voltage conversion circuit as claimed in claim 2, wherein the control chip US1 is STM8S001J 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821856437.5U CN209949498U (en) | 2018-11-12 | 2018-11-12 | Protection circuit for limiting maximum output power of voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821856437.5U CN209949498U (en) | 2018-11-12 | 2018-11-12 | Protection circuit for limiting maximum output power of voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209949498U true CN209949498U (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821856437.5U Active CN209949498U (en) | 2018-11-12 | 2018-11-12 | Protection circuit for limiting maximum output power of voltage conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209949498U (en) |
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2018
- 2018-11-12 CN CN201821856437.5U patent/CN209949498U/en active Active
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