CN207802480U - A kind of light source voltage closed loop control module - Google Patents
A kind of light source voltage closed loop control module Download PDFInfo
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- CN207802480U CN207802480U CN201820136168.9U CN201820136168U CN207802480U CN 207802480 U CN207802480 U CN 207802480U CN 201820136168 U CN201820136168 U CN 201820136168U CN 207802480 U CN207802480 U CN 207802480U
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- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims 1
- 238000001228 spectrum Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000013100 final test Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of light source voltage control module, light source voltage control module includes：Voltage conversion circuit and constant-voltage control circuit；Voltage conversion circuit, the predeterminated voltage for being converted into DC voltage needed for light source；Constant-voltage control circuit, including negative-feedback circuit and Pwm controller；Negative-feedback circuit is respectively connected with, the working frequency for configuring Pwm controller with the compensation node pin and Voltage Feedback pin of Pwm controller；Pwm controller, it is connected with voltage conversion circuit, working frequency work for being configured according to negative-feedback circuit, the voltage to convert the voltage into circuit reality output are adjusted in the preset range on the basis of the predeterminated voltage, and by the Voltage Feedback after adjustment to voltage conversion circuit.It is Pwm controller configuration work frequency by negative-feedback circuit, so that Pwm controller can export stable voltage in the utility model embodiment.
Description
Technical Field
The utility model relates to a light source control technique indicates a light source voltage closed-loop control module especially.
Background
In the related art, when the dc voltage is converted into the preset voltage required by the spectrum light source through the voltage conversion circuit, due to the influence of the ambient temperature or other factors, the voltage actually output by the voltage conversion circuit is not equal to the preset voltage required by the spectrum light source, or the voltage actually output by the voltage conversion circuit is very unstable and fluctuates up and down on the preset voltage, and the fluctuation range is relatively large. For example, the voltage output to the spectral light source at normal temperature is 10V, and when in an environment of 100 ℃, the voltage output to the spectral light source varies between 8V and 9V. If the voltage actually output by the voltage conversion circuit is used for supplying power to the light source to emit a spectrum, the light power of the light source is unstable, when the spectrometer measures the data of the spectrum emitted by the light source, the baseline of background data of the spectrometer can drift, the multivariate calibration model of the spectrum can fail in severe cases, and the final test result of the spectrometer is inaccurate.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a light source voltage closed-loop control module can guarantee that the voltage of exporting for the spectrum light source under high temperature environment is stable.
In order to achieve the purpose of the utility model, the utility model provides a light source voltage closed-loop control module, include: a voltage conversion circuit and a constant voltage control circuit; the voltage conversion circuit is used for converting the direct current voltage into a preset voltage required by the light source; the constant voltage control circuit comprises a negative feedback circuit and a pulse width modulation controller; the negative feedback circuit is used as a peripheral circuit of the pulse width modulation controller, is respectively connected with a compensation node pin and a voltage feedback pin of the pulse width modulation controller, and is used for configuring the working frequency of the pulse width modulation controller; and the pulse width modulation controller is connected with the voltage conversion circuit and used for working according to the working frequency configured by the negative feedback circuit, so that the voltage actually output by the voltage conversion circuit is adjusted to a preset range taking the preset voltage as the reference by using the pulse width modulation signal with the duty ratio of a, and the adjusted voltage is fed back to the voltage conversion circuit.
Further, the light source voltage closed-loop control module further comprises: the overvoltage protection circuit, the temperature protection circuit and the overcurrent protection circuit;
the overvoltage protection circuit comprises a diode unit and a voltage dividing resistor unit, wherein the diode unit is respectively connected with the pulse width modulation controller and the voltage dividing resistor unit;
the temperature protection circuit is connected with the diode unit and used for controlling the voltage conversion circuit to stop working when the temperature of the voltage conversion circuit is higher than a preset temperature;
the over-current protection circuit comprises a metal-oxide semiconductor field effect transistor and a shunt resistance unit, wherein the metal-oxide semiconductor field effect transistor is respectively connected with the pulse width modulation controller and the shunt resistance unit.
Further, the light source voltage closed-loop control module further comprises:
and the electromagnetic interference circuit is connected with the voltage conversion circuit and is used for inhibiting electromagnetic interference and ripples in the output voltage of the voltage conversion circuit.
Further, the light source voltage closed-loop control module further comprises:
and the soft start circuit is arranged between the electromagnetic interference circuit and the pulse width modulation controller and is used for controlling the voltage output to the light source by the pulse width modulation controller to gradually increase when the light source voltage closed-loop control module starts to be electrified.
Further, the light source voltage closed-loop control module further comprises:
and the detection circuit is arranged between the electromagnetic interference circuit and the pulse width modulation controller and used for detecting the voltage actually output by the voltage conversion circuit and feeding back the voltage to the pulse width modulation controller.
Further, the light source voltage closed-loop control module further comprises:
the first red copper radiating fin is arranged on the metal-oxide semiconductor field effect transistor and used for radiating the metal-oxide semiconductor field effect transistor.
Furthermore, the light source voltage closed-loop control module also comprises a rectifying circuit, a filter circuit and a protection circuit;
a rectifying circuit for converting an alternating current voltage into a direct current voltage;
the filter circuit is connected with the rectifying circuit and is used for filtering the direct-current voltage;
and the shunt protection circuit is respectively connected with the filter circuit and the voltage conversion circuit and is used for carrying out overcurrent protection on the rectifier circuit and the filter circuit in a shunt mode.
Further, the light source voltage closed-loop control module further comprises:
and the second red copper radiating fin is arranged on the rectifying circuit and used for radiating the rectifying circuit.
Further, the negative feedback circuit includes: the circuit comprises a first capacitor, a first resistor, a second capacitor, a second resistor, a third capacitor and a fourth resistor;
one end of the first capacitor is connected with the compensation node pin, and the other end of the first capacitor is grounded through the first resistor;
the second capacitor is connected with the second resistor in series and then connected to two ends of the first capacitor in parallel;
the third resistor, the third capacitor and the fourth resistor are connected in series and then connected in parallel to a connecting line between the first capacitor and the first resistor;
the other end of the first capacitor is also connected to the voltage feedback pin.
And further, the light source voltage closed-loop control module is encapsulated by adopting heat-conducting silicon rubber.
The embodiment of the utility model provides an at least include: a voltage conversion circuit and a constant voltage control circuit; the voltage conversion circuit is used for converting the direct current voltage into a preset voltage required by the light source; the constant voltage control circuit comprises a negative feedback circuit and a pulse width modulation controller; the negative feedback circuit is used as a peripheral circuit of the pulse width modulation controller, is respectively connected with a compensation node pin and a voltage feedback pin of the pulse width modulation controller, and is used for configuring the working frequency of the pulse width modulation controller; and the pulse width modulation controller is connected with the voltage conversion circuit and used for working according to the working frequency configured by the negative feedback circuit, so that the voltage actually output by the voltage conversion circuit is adjusted to a preset range taking the preset voltage as the reference by using the pulse width modulation signal with the duty ratio of a, and the adjusted voltage is fed back to the voltage conversion circuit. From the embodiment of the utility model provides a it is visible, through the operating frequency of negative feedback circuit configuration pulse width modulation controller, no matter light source voltage closed-loop control module work is under normal atmospheric temperature or high temperature environment, more stable voltage can be exported to the pulse width modulation controller, and the voltage of this output equals or is close the required voltage of predetermineeing of light source more to it is more stable to make the voltage of exporting for the light source.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.
Fig. 1 is a schematic structural diagram of a light source voltage closed-loop control module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a constant voltage control circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a negative feedback circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an overvoltage protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an over-current protection circuit provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The embodiment of the utility model provides a light source voltage closed-loop control module, as shown in FIG. 1, this light source voltage closed-loop control module includes: a voltage conversion circuit 11 and a constant voltage control circuit 12.
And the voltage conversion circuit 11 is used for converting the direct current voltage into a preset voltage required by the light source.
And a constant voltage control circuit 12 including a negative feedback circuit and a pulse width modulation controller.
And the negative feedback circuit is used as a peripheral circuit of the pulse width modulation controller, is respectively connected with a compensation node pin (namely a COMP pin) and a voltage feedback pin (namely an FB pin) of the pulse width modulation controller, and is used for configuring the working frequency of the pulse width modulation controller.
And the pulse width modulation controller is connected with the voltage conversion circuit 11 and is used for working according to the working frequency configured by the negative feedback circuit, so that the voltage actually output by the voltage conversion circuit 11 is adjusted to a preset range taking a preset voltage as a reference by using the pulse width modulation signal with the duty ratio a, and the adjusted voltage is fed back to the voltage conversion circuit 11.
It should be noted that, when the voltage conversion circuit 11 converts the dc voltage into the preset voltage required by the light source 20, the voltage actually output by the voltage conversion circuit 11 is not equal to the preset voltage due to the influence of external factors. The working frequency of the pwm controller is configured by the negative feedback circuit, the pwm controller can adjust the voltage actually output by the voltage converting circuit 11 to a preset range with a preset voltage as a reference, for example, the preset voltage is Vout, and the voltage output by the pwm controller can reach Vout ± 0.01v by reasonably designing the negative feedback circuit. The step of the pwm controller adjusting the voltage actually output by the voltage conversion circuit 11 includes: the voltage actually output by the voltage conversion circuit 11 is compared with the preset voltage required by the light source 20, the difference between the voltage actually output by the voltage conversion circuit 11 and the preset voltage is compared, and the duty ratio a is calculated according to the difference. The voltage actually output by the voltage conversion circuit 11 is adjusted to be within a preset range with reference to a preset voltage using the pulse width modulation signal having the duty ratio a. The pwm controller outputs the adjusted voltage to the light source 20 and feeds back the adjusted voltage to the voltage conversion circuit 11 to form closed loop control.
As shown in fig. 2, the pwm controller may be a chip with model number XTR30011, and includes a sampler for collecting the voltage actually output by the voltage conversion circuit 11 and a comparator; the comparator is used for comparing the voltage actually output by the voltage conversion circuit 11 with a preset voltage required by the light source, and comparing a difference value between the voltage actually output by the voltage conversion circuit 11 and the preset voltage; wherein the larger the difference value is, the larger the duty ratio of a Pulse Width Modulation (PWM) signal is; the smaller the difference between the voltage actually output by the voltage conversion circuit 11 and the preset voltage is, the smaller the duty ratio of the pulse width modulation signal is. The pwm controller is connected to the voltage conversion circuit 11 through the PVDD port. J1 in fig. 2 represents a connector for connecting two circuits. VIN represents the input voltage and VDD represents the operating voltage of the pwm controller.
The negative feedback circuit between the COMP pin and the FB pin in fig. 2 may be the circuit shown in fig. 3. As shown in fig. 3, the negative feedback circuit includes: the circuit comprises a first capacitor C8, a first resistor R22, a second capacitor C9, a second resistor R10, a third resistor R15, a third capacitor C15 and a fourth resistor R19.
One end of the first capacitor C8 is connected to the COMP pin of the pwm controller, and the other end of the first capacitor C8 is grounded via a first resistor R22.
The second capacitor C9 is connected in series with the second resistor R10 and then connected in parallel to two ends of the first capacitor C8.
The third resistor R15, the third capacitor C15 and the fourth resistor R19 are connected in series and then connected in parallel to a connecting line between the first capacitor C8 and the first resistor R22.
The other end of the first capacitor C8 is also connected to the FB pin of the pwm controller.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes: the safety protection circuit 13, the safety protection circuit 13 includes overvoltage protection circuit, temperature protection circuit and overcurrent protection circuit.
As shown in fig. 4, the overvoltage protection circuit includes a diode unit U4 (i.e., XTR1N0415-D) and a voltage dividing resistor unit, and the diode unit is connected to the pwm controller and the voltage dividing resistor unit, respectively. Where the EN CHIP in the diode cell is connected to the EN CHIP in the pulse width modulation controller in fig. 2. The overvoltage protection circuit also includes a transistor Q1. The voltage dividing resistance unit comprises a resistor R16 and a resistor R25, an appropriate voltage protection threshold value is set by adjusting the resistor R16 and the resistor R25, and when the voltage is larger than the voltage protection threshold value, the voltage is reduced in a voltage dividing mode. And the temperature protection circuit is connected with the diode unit and is used for controlling the voltage conversion circuit 11 to stop working when the temperature of the voltage conversion circuit 11 is higher than a preset temperature. The Temperature protection circuit comprises a resistor R18, a Negative Temperature Coefficient (NTC) thermistor R20 and a resistor R26, and an appropriate Temperature protection threshold is set by adjusting the resistor R18 and the resistor R26. Because the overvoltage protection circuit and the temperature protection circuit share one diode unit U4, the diode unit U4 is fully utilized, the use of devices is reduced, and the space occupied by the voltage stabilizing module is smaller.
As shown in fig. 5, the over-current protection circuit includes a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) and a shunt resistor unit, where the Metal-Oxide-Semiconductor Field Effect Transistor (i.e., XTR20411 in fig. 5) is connected to the pwm controller and the shunt resistor unit, respectively. The shunt resistor unit comprises a resistor R19, a proper current protection threshold value can be set by adjusting the resistance value of the resistor R19, and the smaller the resistor R19 is, the larger the current protection threshold value is.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes:
an Electromagnetic Interference (EMI) circuit 14 is connected to the voltage converting circuit 11, and is configured to suppress Electromagnetic Interference and ripples in the voltage regulator module.
It should be noted that the electromagnetic interference circuit 14 suppresses the power supply ripple and the electromagnetic interference, instead of using a simple LC network formed by using an inductor and a capacitor, so that the ripple coefficient of the light source voltage closed-loop control module is only 0.2%, which is much smaller than that of the similar light source voltage closed-loop control module, and the ripple can be effectively suppressed at a high temperature.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes:
and the soft start circuit 15 is arranged between the electromagnetic interference circuit 14 and the pulse width modulation controller, and is used for controlling the voltage output by the pulse width modulation controller to the light source 20 to gradually increase when the light source voltage closed-loop control module starts to be powered on.
It should be noted that the soft start circuit 15 includes a capacitor, a comparator and a switching converter circuit, the capacitor in the soft start circuit 15 is charged to obtain a soft start voltage, and the switching converter circuit is switched from a start state to a normal operating state by the comparator in the soft start circuit 15, so that the voltage output to the light source is gradually increased, rather than being increased in a step manner when the light source is powered on, that is, the output voltage is not suddenly changed, thereby avoiding the light source from being impacted by the sudden increase of the voltage.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes:
and the detection circuit 16 is arranged between the electromagnetic interference circuit 14 and the pulse width modulation controller, and is used for detecting the voltage actually output by the voltage conversion circuit 11 and feeding back the voltage to the pulse width modulation controller.
The voltage actually output by the voltage conversion circuit 11 is detected by the detection circuit 16, so that the constant voltage control circuit 12 compares the voltage actually output by the voltage conversion circuit 11 with the preset voltage required by the light source. The detection circuit 16 may be used to detect the current actually output by the voltage conversion circuit 11, in addition to the voltage actually output by the voltage conversion circuit 11. In fig. 2, the HDrv pin and the LDrv pin of the pwm controller are connected to the voltage converting circuit 11 through the detecting circuit 16, respectively.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes a rectification circuit 17, a filter circuit 18, and a shunt protection circuit 19.
The rectifier circuit 17 converts an alternating current voltage into a direct current voltage.
The rectifier circuit 17 may be designed as a full-bridge rectifier, and converts a sinusoidal ac voltage into a unidirectional pulsating dc voltage by using unidirectional conductivity of a diode.
And the filter circuit 18 is connected with the rectifying circuit 17 and is used for filtering the direct-current voltage.
It should be noted that the filter circuit 18 includes a low-pass filter formed by a capacitor-resistor circuit, and the filter circuit 18 performs filtering rectification on the converted dc voltage and suppresses voltage ripples.
And the shunt protection circuit 19 is connected with the filter circuit 18 and the voltage conversion circuit 11 respectively and is used for performing overcurrent protection on the rectifying circuit 17 and the filter circuit 18 in a shunt mode.
It should be noted that the shunt protection circuit 19 may include a resistor, which is connected in parallel to the output end of the rectifying circuit 17, so as to perform overcurrent protection on the power module by means of shunt.
Further, on the basis of the corresponding embodiment in fig. 1, the light source voltage closed-loop control module further includes:
the first red copper radiating fin is arranged on the metal-oxide semiconductor field effect transistor and used for radiating heat of the metal-oxide semiconductor field effect transistor.
Because the metal-oxide semiconductor field effect transistor has large current flowing, the metal-oxide semiconductor field effect transistor has obvious heating phenomenon and needs heat dissipation treatment. The heat sink made of aluminum is not effective, so that the heat generated during the operation of the device is conducted by using a material with good thermal conductivity. The red copper radiating fins with the thermal conductivity coefficient of 388-391W/(m.K) are selected and installed on XTR20411 in the figure 5, so that the purpose of rapid heat dissipation is achieved.
Further, the light source voltage closed-loop control module further comprises:
and a second red copper heat sink provided on the rectifying circuit 17 for dissipating heat from the rectifying circuit 17.
Because the rectifying circuit 17 has a large current passing through and has a relatively obvious heating phenomenon, the red copper radiating fin with the heat conductivity coefficient of 388-391W/(m.K) is selected and installed on the rectifying circuit 17, and the purpose of rapid heat radiation is achieved.
Further, the light source voltage closed-loop control module is encapsulated by heat-conducting silicon rubber.
The light source voltage closed-loop control module is encapsulated by the heat-conducting silicon rubber, so that the light source voltage closed-loop control module can normally work in a high-temperature vibration environment while meeting the electrical performance index, and the anti-seismic requirement on the light source voltage closed-loop control module is met.
Further, high-temperature resistant components are adopted, for example, the pulse width modulation controller is an XTR30011 chip, the rectifying circuit 17 is a high-temperature resistant rectifier bridge stack of SML010FBDH06, the MOS transistor in the overcurrent protection circuit is an MOS transistor of XTR20411, the diode unit is a high-temperature switch control diode of XTR1N4015, the negative feedback circuit has the characteristics of low temperature drift and high precision, and the light source voltage closed-loop control module can work in an environment of 175 ℃ for a long time.
According to the utility model discloses light source voltage closed-loop control module, include: a voltage conversion circuit and a constant voltage control circuit; the voltage conversion circuit is used for converting the direct current voltage into a preset voltage required by the light source; the constant voltage control circuit comprises a negative feedback circuit and a pulse width modulation controller; the negative feedback circuit is used as a peripheral circuit of the pulse width modulation controller, is respectively connected with a compensation node pin and a voltage feedback pin of the pulse width modulation controller, and is used for configuring the working frequency of the pulse width modulation controller; and the pulse width modulation controller is connected with the voltage conversion circuit and is used for working according to the working frequency configured by the negative feedback circuit, so that the voltage actually output by the voltage conversion circuit is adjusted to a preset range taking the preset voltage as the reference by using the pulse width modulation signal with the duty ratio of a, and the adjusted voltage is fed back to the voltage conversion circuit. From the embodiment of the utility model provides a it is visible, through the operating frequency of negative feedback circuit configuration pulse width modulation controller, no matter light source voltage closed-loop control module work is under normal atmospheric temperature or high temperature environment, more stable voltage can be exported to the pulse width modulation controller, and the voltage of this output equals or is close the required voltage of predetermineeing of light source more to it is more stable to make the voltage of exporting for the light source.
The embodiment of the present invention provides a light source voltage closed-loop control module to compare with the light source voltage closed-loop control module in the related art through specific experimental data:
1. under high temperature (say 175 ℃) environment, the embodiment of the utility model provides an output of light source voltage closed-loop control module is within 0.8% for the voltage precision error of light source, and the voltage error of output for the light source among the correlation technique is 3%.
2. Under the high temperature environment, the embodiment of the utility model provides an in the ripple coefficient control of light source voltage closed-loop control module within 0.3%, the ripple coefficient in the correlation technique is greater than 0.5%.
3. Under the high temperature environment, the embodiment of the utility model provides an in the linear adjustment rate control of light source voltage closed-loop control module within 0.2%.
4. The embodiment of the utility model provides an in light source voltage closed-loop control module have better vibration resistance, interference killing feature and resistance to corrosion, and the luminous power when guaranteeing the light source output spectrum is more stable, makes the terminal voltage of light source reduce along with the increase of light intensity, increases along with the reduction of light intensity.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A light source voltage closed-loop control module, comprising: a voltage conversion circuit and a constant voltage control circuit; wherein,
the voltage conversion circuit is used for converting the direct current voltage into a preset voltage required by the light source;
the constant voltage control circuit comprises a negative feedback circuit and a pulse width modulation controller;
the negative feedback circuit is used as a peripheral circuit of the pulse width modulation controller, is respectively connected with a compensation node pin and a voltage feedback pin of the pulse width modulation controller, and is used for configuring the working frequency of the pulse width modulation controller;
and the pulse width modulation controller is connected with the voltage conversion circuit and used for working according to the working frequency configured by the negative feedback circuit, so that the voltage actually output by the voltage conversion circuit is adjusted to a preset range taking the preset voltage as the reference by using the pulse width modulation signal with the duty ratio of a, and the adjusted voltage is fed back to the voltage conversion circuit.
2. The light source voltage closed-loop control module of claim 1, further comprising: the overvoltage protection circuit, the temperature protection circuit and the overcurrent protection circuit;
the overvoltage protection circuit comprises a diode unit and a voltage dividing resistor unit, wherein the diode unit is respectively connected with the pulse width modulation controller and the voltage dividing resistor unit;
the temperature protection circuit is connected with the diode unit and used for controlling the voltage conversion circuit to stop working when the temperature of the voltage conversion circuit is higher than a preset temperature;
the over-current protection circuit comprises a metal-oxide semiconductor field effect transistor and a shunt resistance unit, wherein the metal-oxide semiconductor field effect transistor is respectively connected with the pulse width modulation controller and the shunt resistance unit.
3. The light source voltage closed-loop control module according to claim 1 or 2, further comprising:
and the electromagnetic interference circuit is connected with the voltage conversion circuit and is used for inhibiting electromagnetic interference and ripples in the output voltage of the voltage conversion circuit.
4. The light source voltage closed-loop control module of claim 3, further comprising:
and the soft start circuit is arranged between the electromagnetic interference circuit and the pulse width modulation controller and is used for controlling the voltage output to the light source by the pulse width modulation controller to gradually increase when the light source voltage closed-loop control module starts to be electrified.
5. The light source voltage closed-loop control module of claim 3, further comprising:
and the detection circuit is arranged between the electromagnetic interference circuit and the pulse width modulation controller and used for detecting the voltage actually output by the voltage conversion circuit and feeding back the voltage to the pulse width modulation controller.
6. The light source voltage closed-loop control module of claim 2, further comprising:
the first red copper radiating fin is arranged on the metal-oxide semiconductor field effect transistor and used for radiating the metal-oxide semiconductor field effect transistor.
7. The light source voltage closed-loop control module according to claim 1 or 2, further comprising a rectifying circuit, a filtering circuit and a protection circuit;
a rectifying circuit for converting an alternating current voltage into a direct current voltage;
the filter circuit is connected with the rectifying circuit and is used for filtering the direct-current voltage;
and the shunt protection circuit is respectively connected with the filter circuit and the voltage conversion circuit and is used for carrying out overcurrent protection on the rectifier circuit and the filter circuit in a shunt mode.
8. The light source voltage closed-loop control module of claim 7, further comprising:
and the second red copper radiating fin is arranged on the rectifying circuit and used for radiating the rectifying circuit.
9. The light source voltage closed loop control module according to claim 1 or 2, wherein the negative feedback circuit comprises: the circuit comprises a first capacitor, a first resistor, a second capacitor, a second resistor, a third capacitor and a fourth resistor;
one end of the first capacitor is connected with the compensation node pin, and the other end of the first capacitor is grounded through the first resistor;
the second capacitor is connected with the second resistor in series and then connected to two ends of the first capacitor in parallel;
the third resistor, the third capacitor and the fourth resistor are connected in series and then connected in parallel to a connecting line between the first capacitor and the first resistor;
the other end of the first capacitor is also connected to the voltage feedback pin.
10. The light source voltage closed-loop control module of claim 1, wherein the light source voltage closed-loop control module is potted with thermally conductive silicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820136168.9U CN207802480U (en) | 2018-01-26 | 2018-01-26 | A kind of light source voltage closed loop control module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820136168.9U CN207802480U (en) | 2018-01-26 | 2018-01-26 | A kind of light source voltage closed loop control module |
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| CN207802480U true CN207802480U (en) | 2018-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108200707A (en) * | 2018-01-26 | 2018-06-22 | 中国海洋石油集团有限公司 | A kind of light source voltage control module |
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2018
- 2018-01-26 CN CN201820136168.9U patent/CN207802480U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108200707A (en) * | 2018-01-26 | 2018-06-22 | 中国海洋石油集团有限公司 | A kind of light source voltage control module |
| CN108200707B (en) * | 2018-01-26 | 2023-12-15 | 中国海洋石油集团有限公司 | Light source voltage control module |
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