CN219802160U - 48V-to-12V power conversion circuit - Google Patents
48V-to-12V power conversion circuit Download PDFInfo
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- CN219802160U CN219802160U CN202320954549.9U CN202320954549U CN219802160U CN 219802160 U CN219802160 U CN 219802160U CN 202320954549 U CN202320954549 U CN 202320954549U CN 219802160 U CN219802160 U CN 219802160U
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Abstract
The utility model discloses a 48V-to-12V power conversion circuit, which comprises: the power supply circuit comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q404, a triode Q408, a MOS tube Q406, a power MOS tube Q405, a power MOS tube Q407, a power supply control module and a second LC filter circuit; the first LC filter circuit consists of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415; the input end of the inductor L401 is loaded with 48V input voltage, and the output end of the first LC filter circuit is coupled to the primary coil of the transformer; the utility model realizes the secondary conversion of the output voltage by the control of the power supply control module, converts the output voltage into the DC 12V sawtooth wave output, and the output end can reach KW level to the power supply load power, thereby solving the defect that the load power can not exceed 120W by using the output end of the DC voltage reduction module.
Description
Technical Field
The utility model relates to the technical field of voltage conversion, in particular to a 48V-to-12V power conversion circuit.
Background
In the field of electronic instruments, a 48V storage battery is commonly used for supplying power to the instrument, and inside the electronic instrument, 12V direct current power supply is also used as some components or the electronic instrument is provided with a 12V peripheral interface, and the electronic instrument is coupled to external equipment for use through the peripheral interface;
at present, the conversion of 48V voltage into 12V voltage is generally realized by adopting a direct current voltage reduction module, loads with different powers can select voltage reduction modules with different currents, however, the direct current voltage reduction module has a disadvantage that the direct current voltage reduction module is not suitable for an electric appliance with load power exceeding 120W, and the direct current voltage reduction module is adopted for direct voltage reduction output, so that the output voltage cannot be ensured to be 12V direct current voltage under the condition of no secondary detection, and a voltage fluctuation error of about 5MV exists.
The prior art can not meet the demands of people at present, and based on the present situation, the prior art needs to be improved.
Disclosure of Invention
The present utility model is directed to a 48V-to-12V power conversion circuit, which solves the above-mentioned problems.
In one aspect, the utility model provides a 48V-to-12V power conversion circuit, which comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q404, a triode Q408, a MOS tube Q406, a power MOS tube Q405, a power MOS tube Q407, a power control module and a second LC filter circuit;
the first LC filter circuit is composed of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415, the input end of the inductor L401 is loaded with 48V input voltage, the output end of the first LC filter circuit is coupled to a primary coil of a transformer, the PWM control module outputs PWM signals DRV1 to be loaded to bases of a triode Q404 and a triode Q408, the triode Q404 and the triode Q408 are coupled to output DRV1A signals through a common emitter, the DRV1A signals are loaded to a grid electrode of a MOS tube Q406, and a source electrode of the MOS tube Q406 is coupled to the primary coil of the transformer; one output end of a secondary coil of the transformer is respectively coupled to a source electrode of the power MOS tube Q405 and a source electrode of the power MOS tube Q407, the other output end of the secondary coil of the transformer is coupled to a power control module, one output end of the power control module is coupled to a grid electrode of the power MOS tube Q405, and the other output end of the power control module is coupled to the grid electrode of the power MOS tube Q407; the source electrode and the drain electrode of the power MOS tube Q405 are sequentially coupled with an inductor L402, a capacitor C418, a capacitor C419, a capacitor C420 and an inductor L400 as output ends, and the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 form a second LC filter circuit together;
on the other hand, the utility model also provides a 48V-to-12V power conversion circuit according to another technical scheme, which comprises the following components: the device comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q204, a triode Q205, a MOS tube Q406, a voltage detection control module diode D501 and a second LC filter circuit;
the first LC filter circuit consists of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415, wherein the input end of the inductor L401 is loaded with 48V input voltage, and the output end of the first LC filter circuit is coupled to the primary coil of the transformer;
the control end COMP of the PWM control module is coupled to the voltage detection control module, the output end of the voltage detection control module outputs DRV2 signals which are respectively loaded to the bases of the triode Q204 and the triode Q205, the triode Q204 and the triode Q205 are coupled to the grid electrode of the MOS transistor Q406 through the common emitter to output DRV2A signals, and the source electrode of the MOS transistor Q406 is coupled to the primary coil of the transformer;
one path of secondary coil of the transformer is loaded with a power supply VCC, and the other path of secondary coil is sequentially coupled with an inductor L402, a capacitor C418, a capacitor C419, a capacitor C420 and an inductor L400 through a diode D501 which is coupled in parallel in the same direction;
the secondary coil of the transformer also outputs a reference voltage VREF for detection, the output reference voltage VREF is loaded to the voltage detection control module, and the voltage detection control module detects whether the voltage output by the secondary coil of the transformer is the required voltage or not through the reference voltage VREF.
The utility model has the following beneficial effects:
on one hand, the utility model adopts the first technical scheme, and can realize the secondary conversion of output voltage through the control of the power supply control module under the condition of not using the direct current voltage reduction module, the output voltage is converted into the direct current 12V sawtooth wave output, the power of the output end for a power supply load can reach KW level, and the defect that the power of the output end for the load cannot exceed 120W by using the direct current voltage reduction module is overcome;
on the other hand, the second technical scheme is adopted, the voltage detection control module detects the reference voltage VREF in real time, the stable low-ripple direct current 12V voltage is ensured to be output by converting the direct current 48V voltage, and the output end can also reach KW level to the power of a power supply load.
Drawings
FIG. 1 is a circuit diagram of a first embodiment of the present utility model;
fig. 2 is a circuit schematic of a second embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the present utility model without making any inventive effort fall within the scope of the present utility model.
First embodiment: referring to fig. 1, the utility model provides two technical schemes of high-current power conversion from 48V dc to 12V dc, wherein the first technical scheme is as follows: A48V-to-12V power conversion circuit comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q404, a triode Q408, a MOS tube Q406, a power MOS tube Q405, a power MOS tube Q407, a power control module and a second LC filter circuit;
the first LC filter circuit is composed of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415, the input end of the inductor L401 is loaded with 48V input voltage, the output end of the first LC filter circuit is coupled to a primary coil of a transformer, the PWM control module outputs PWM signals DRV1 to be loaded to bases of a triode Q404 and a triode Q408, the triode Q404 and the triode Q408 are coupled to output DRV1A signals through a common emitter, the DRV1A signals are loaded to a grid electrode of a MOS tube Q406, and a source electrode of the MOS tube Q406 is coupled to the primary coil of the transformer; one output end of a secondary coil of the transformer is respectively coupled to a source electrode of the power MOS tube Q405 and a source electrode of the power MOS tube Q407, the other output end of the secondary coil of the transformer is coupled to a power control module, one output end of the power control module is coupled to a grid electrode of the power MOS tube Q405, and the other output end of the power control module is coupled to the grid electrode of the power MOS tube Q407; the source electrode and the drain electrode of the power MOS tube Q405 are sequentially coupled with an inductor L402, a capacitor C418, a capacitor C419, a capacitor C420 and an inductor L400 as output ends, and the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 form a second LC filter circuit together;
as an alternative embodiment of the first embodiment of the present utility model, when the technical scheme is implemented, after the direct current 48V voltage is filtered by an LC filter circuit formed by an inductance L401 and a ceramic capacitor C411C412C415, the direct current 48V voltage is connected to a primary coil of a transformer T401, a PWM signal DRV1 output by a PWM control module is converted into a DRV1A signal through an upper triode Q404 and a lower triode Q404 and a triode Q408, the DRV1A signal is loaded to a primary coil of the transformer T401 through a MOS tube Q406, the PWM control module controls the conversion voltage proportion of the transformer T401 by changing the PWM duty ratio, the conversion of 48V voltage to 12V voltage is realized, the voltage after primary conversion is loaded to a power MOS tube Q405 and a power MOS tube Q407, the secondary conversion of the output voltage is realized under the control of a power supply control module, and then the secondary conversion is converted into a direct current 12V sawtooth wave, and finally the low-voltage stable output 12V wave of the power supply is realized through a second LC filter circuit formed by the inductance L402 and the capacitor C419, the capacitor C420 and the inductance L400.
Second embodiment: referring to fig. 2, as an alternative embodiment of the present utility model, the present utility model also provides another 48V to 12V power conversion circuit, including: the device comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q204, a triode Q205, a MOS tube Q406, a voltage detection control module diode D501 and a second LC filter circuit;
the first LC filter circuit is composed of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415, the input end of the inductor L401 is loaded with 48V input voltage, the output end of the first LC filter circuit is coupled to a primary coil of a transformer, the control end COMP of the PWM control module is coupled to the voltage detection control module, the output end of the voltage detection control module outputs DRV2 signals, the DRV2 signals are loaded to a triode Q204 and the base electrode of a triode Q205, the triode Q204 and the triode Q205 are coupled to output DRV2A signals through a common emitter, the DRV2A signals are loaded to the grid electrode of a MOS tube Q406, the source electrode of the MOS tube Q406 is coupled to the primary coil of the transformer, one path of the secondary coil of the transformer is loaded with a power supply, the other path of the secondary coil of the transformer is sequentially coupled to the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 through a diode D501 which is coupled in parallel, the common direction, the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 form the reference voltage of the secondary coil of the transformer is also coupled to the reference voltage of the transformer, and the reference voltage of the reference coil is detected by the voltage of the inductor is output by the voltage of the inductor Q205;
as an alternative embodiment of the second embodiment of the present utility model, when the technical scheme is implemented, after the direct current 48V voltage is filtered by an LC filter circuit formed by an inductor L401 and a ceramic capacitor C411C412C415, the direct current 48V voltage is connected to a primary coil of a transformer T401, a PWM control module controls a voltage detection control module to output a PWM signal DRV2 through a control end COMP, the signal DRV2 is converted into a DRV2A signal through an upper triode Q204 and a lower triode Q205, the DRV2A signal is loaded to a primary coil of the transformer T401 through a MOS transistor Q406, the PWM control module controls the conversion voltage proportion of the transformer T401 by changing the PWM duty ratio mode, the conversion of the 48V voltage to the 12V voltage is realized, the conversion is converted into a direct current 12V sawtooth wave, a diode D501 connected in parallel is further subjected to a larger current, when one diode is damaged, the other diode can continue to work, the reference voltage VREF output by a secondary coil of the transformer is loaded to the voltage detection control module, the voltage detection control module detects the output reference voltage, if the voltage detection control module meets the detection condition of the output voltage VREF, and the voltage detection module outputs the voltage 12V voltage, and the voltage is stable through the inductor C401 and the second capacitor C12V voltage after the second voltage is changed, the second voltage is output by the inductor C401, and the second voltage is converted to the second voltage is stable, and the voltage is output by the capacitor C401, and the second voltage is stable, and the voltage is output by the capacitor C12V filter circuit is changed, and the voltage has a voltage stable condition.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (7)
1. A 48V to 12V power conversion circuit, characterized by: converting the direct current 48V voltage to output stable low-ripple direct current 12V voltage;
comprising the following steps: the power supply circuit comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q404, a triode Q408, a MOS tube Q406, a power MOS tube Q405, a power MOS tube Q407, a power supply control module and a second LC filter circuit; wherein,,
the first LC filter circuit consists of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415; the input end of the inductor L401 is loaded with 48V input voltage, and the output end of the first LC filter circuit is coupled to the primary coil of the transformer;
the PWM control module outputs PWM signals DRV1 to be respectively loaded to bases of a triode Q404 and a triode Q408, the triode Q404 and the triode Q408 are coupled with output DRV1A signals through a common emitter, the DRV1A signals are loaded to a grid electrode of an MOS tube Q406, and a source electrode of the MOS tube Q406 is coupled to a primary coil of a transformer;
one output end of a secondary coil of the transformer is respectively coupled to a source electrode of the power MOS tube Q405 and a source electrode of the power MOS tube Q407, and the other output end is coupled to the power control module;
one path of the output end of the power supply control module is coupled to the grid electrode of the power MOS tube Q405, and the other path of the output end of the power supply control module is coupled to the grid electrode of the power MOS tube Q407;
the source and the drain of the power MOS transistor Q405 are sequentially coupled to the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 as output terminals.
2. The 48V to 12V power conversion circuit according to claim 1, wherein: the inductor L402, the capacitor C418, the capacitor C419, the capacitor C420 and the inductor L400 together form a second LC filter circuit, which filters the 12V output power supply.
3. The 48V to 12V power conversion circuit according to claim 1, wherein: the PWM control module controls the conversion voltage proportion of the transformer by changing the PWM duty ratio, and converts the 48V voltage into the 12V voltage.
4. The 48V to 12V power conversion circuit according to claim 1, wherein: and the voltage output by the transformer is converted and output into a direct-current 12V sawtooth wave through the power supply control module.
5. A48V-to-12V power conversion circuit is characterized in that a voltage detection control module detects a reference voltage VREF in real time to ensure that a stable low-ripple direct current 12V voltage is output by converting a direct current 48V voltage;
comprising the following steps: the device comprises a first LC filter circuit, a transformer, a PWM control module, a triode Q204, a triode Q205, a MOS tube Q406, a voltage detection control module diode D501 and a second LC filter circuit;
the first LC filter circuit consists of an inductor L401, a ceramic capacitor C411, a ceramic capacitor C412 and a ceramic capacitor C415, wherein the input end of the inductor L401 is loaded with 48V input voltage, and the output end of the first LC filter circuit is coupled to the primary coil of the transformer;
the control end COMP of the PWM control module is coupled to the voltage detection control module, the output end of the voltage detection control module outputs DRV2 signals which are respectively loaded to the bases of the triode Q204 and the triode Q205, the triode Q204 and the triode Q205 are coupled to the grid electrode of the MOS transistor Q406 through the common emitter to output DRV2A signals, and the source electrode of the MOS transistor Q406 is coupled to the primary coil of the transformer;
one path of secondary coil of the transformer is loaded with a power supply VCC, and the other path of secondary coil is sequentially coupled with an inductor L402, a capacitor C418, a capacitor C419, a capacitor C420 and an inductor L400 through a diode D501 which is coupled in parallel in the same direction;
the PWM control module controls the conversion voltage proportion of the transformer by changing the PWM duty ratio to convert 48V voltage into 12V voltage;
the secondary coil of the transformer also outputs a reference voltage VREF for detection, and the output reference voltage VREF is loaded to the voltage detection control module.
6. A 48V to 12V power conversion circuit according to claim 5, wherein: the voltage detection control module detects whether the voltage output by the secondary coil of the transformer is direct-current 12V voltage or not through reference voltage VREF.
7. The 48V-to-12V power conversion circuit according to claim 6, wherein: when the voltage detection control module detects the output reference voltage VREF, if the detected voltage meets the output condition of 12V, the voltage detection control module outputs stable low-ripple 12V direct current voltage after filtering through a second LC filter circuit consisting of an inductor L402, a capacitor C418, a capacitor C419, a capacitor C420 and an inductor L400;
if the voltage detection control module detects that the output reference voltage VREF does not meet the output condition of 12V, the PWM control module controls the output proportion of the secondary conversion voltage of the transformer again by changing the PWM duty ratio until the transformer outputs the DC 12V sawtooth wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320954549.9U CN219802160U (en) | 2023-04-25 | 2023-04-25 | 48V-to-12V power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320954549.9U CN219802160U (en) | 2023-04-25 | 2023-04-25 | 48V-to-12V power conversion circuit |
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|---|---|
| CN219802160U true CN219802160U (en) | 2023-10-03 |
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| CN202320954549.9U Active CN219802160U (en) | 2023-04-25 | 2023-04-25 | 48V-to-12V power conversion circuit |
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| CN (1) | CN219802160U (en) |
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