CN218940949U - Wide-voltage input power supply conversion circuit and DC-DC power supply - Google Patents

Abstract

The utility model provides a wide-voltage input power supply conversion circuit and a DC-DC power supply, wherein the wide-voltage input power supply conversion circuit comprises: the system comprises a first-stage control module, a second-stage control module, a plurality of first-stage driving modules, a plurality of first-stage energy conversion modules, a plurality of second-stage driving modules and a plurality of second-stage energy conversion modules; each first-stage driving module is connected with a first-stage control module, each second-stage driving module is connected with a second-stage control module, each first-stage driving module is connected with a first-stage energy conversion module, each second-stage driving module is connected with a second-stage energy conversion module, the input end of each first-stage energy conversion module is used as the input end of a wide-voltage input power conversion circuit, the output end of each first-stage energy conversion module is connected with the input end of the second-stage energy conversion module, and the output end of each second-stage energy conversion module is used as the output end of the wide-voltage input power conversion circuit. The utility model can flexibly regulate and control the output current of the circuit.

Description

Wide-voltage input power supply conversion circuit and DC-DC power supply

Technical Field

The present utility model relates to the field of electronic devices, and in particular, to a wide-voltage input power conversion circuit and a DC-DC (Direct Current-Direct Current) power supply.

Background

With the continuous improvement of integrated IC circuit technology, electronic devices such as CPU (central processing unit ), graphics card, GPU (graphics processing unit, graphics processor) in the market have higher performance and higher power consumption, so that the power consumption of the whole machine of the corresponding electronic device is higher and higher, and the power requirement of the power supply of the whole machine is higher and higher.

However, the existing dc conversion circuit has a simple structure, and cannot flexibly regulate the current output by the circuit, and after conversion of BUCK and BOOST, the output voltage can only be converted to 12V, and because the existing circuit itself limits, the output maximum current can only reach 25A, so that the requirement of electronic equipment with 300W power consumption can only be met, and the circuit cannot be applied to electronic equipment with higher power consumption.

Disclosure of Invention

In order to solve the problems, the wide-voltage input power supply conversion circuit and the DC-DC power supply provided by the utility model can flexibly adjust the output current of the wide-voltage input power supply conversion circuit under the condition of not changing the input voltage of the wide-voltage input power supply conversion circuit by arranging a plurality of primary energy conversion modules and a plurality of secondary energy conversion modules.

In a first aspect, the present utility model provides a wide voltage input power conversion circuit, comprising: the system comprises a first-stage control module, a second-stage control module, a plurality of first-stage driving modules, a plurality of first-stage energy conversion modules, a plurality of second-stage driving modules and a plurality of second-stage energy conversion modules;

the number of the primary driving modules, the primary energy conversion modules, the secondary driving modules and the secondary energy conversion modules is the same, each primary driving module is connected with the primary control module, each secondary driving module is connected with the secondary control module, each primary driving module is connected with one-to-one energy conversion module, each secondary driving module is connected with one-to-two energy conversion module, the input end of each primary energy conversion module is used as the input end of the wide-voltage input power conversion circuit together, the output end of each primary energy conversion module is connected with the input end of one-to-two energy conversion module, and the output end of each secondary energy conversion module is used as the output end of the wide-voltage input power conversion circuit together;

the first-stage control module is used for sending a first-stage control signal to each first-stage driving module so that the output voltage of at least one first-stage energy conversion module is higher than the input voltage;

The secondary control module is used for sending a secondary control signal to each secondary driving module so that the output voltage of at least one secondary energy conversion module is lower than the input voltage of the secondary energy conversion module.

Optionally, the primary energy conversion module includes: the first primary control switch, the second primary control switch, the primary inductor and the first primary energy storage filter unit;

the first one-level control switch includes: first one-level control end, first one-level link and second one-level link, second one-level control switch includes: the second-stage control end, the third-stage connecting end and the fourth-stage connecting end;

the first primary control end and the second primary control end are connected with the primary driving module, the first primary connecting end is connected with the first primary energy storage filtering unit and the secondary energy conversion module, the second primary connecting end is respectively connected with the third primary connecting end and one end of the primary inductor, and the other end of the primary inductor is connected with the input end of the primary energy conversion module;

the first primary control end is used for controlling the on-off relation of the first primary connecting end and the second primary connecting end, and the second primary control end is used for controlling the on-off relation of the third primary connecting end and the fourth primary connecting end;

The first-stage driving module is used for sending a first-stage regulation signal to the first-stage control end and the second-stage control end so that the first-stage connecting end and the second-stage connecting end are communicated with one group of connecting ends in the third-stage connecting end and the fourth-stage connecting end, and the other group of connecting ends are disconnected;

the first primary energy storage filtering unit is used for storing energy and filtering the voltage in the primary energy conversion module.

Optionally, the first primary energy storage filter unit includes a plurality of first primary energy storage filter capacitors connected in parallel;

one end of the first primary energy storage filter capacitor is connected with the second-stage energy conversion module, and the other end of the first primary energy storage filter capacitor is grounded.

Optionally, the primary energy conversion module further comprises: a second-stage energy storage filtering unit;

one end of the second-stage energy storage filtering unit is connected with the input end of the first-stage energy conversion module, and the other end of the second-stage energy storage filtering unit is grounded;

the second-stage energy storage filtering unit is used for storing energy and filtering the voltage in the first-stage energy conversion module.

Optionally, the second-stage energy storage filtering unit comprises a plurality of second-stage energy storage filtering capacitors connected in parallel;

one end of the second-stage energy storage filter capacitor is connected with the input end of the first-stage energy conversion module, and the other end of the second-stage energy storage filter capacitor is grounded.

Optionally, the primary energy conversion module further comprises: a primary monitoring unit;

the primary monitoring unit is connected with the primary control module and the primary inductor;

the first-stage monitoring unit is used for monitoring the current of the first-stage inductor and feeding back the current to the first-stage control module so that the first-stage control module can adjust the on-off time of the first-stage control switch and the second first-stage control switch according to the current of the first-stage inductor.

Optionally, the primary monitoring unit comprises: the first primary monitoring end, the second primary monitoring end, the third primary monitoring end, the first primary resistor, the second primary resistor, the third primary resistor, the fourth primary resistor, the fifth primary resistor, the first primary capacitor and the second primary capacitor;

the first-stage inductor is connected with the input end of the first-stage energy conversion module through a first-stage resistor, one end of the first-stage resistor connected with the first-stage inductor is connected with one end of a second-stage resistor, the other end of the second-stage resistor is connected with one end of a first-stage capacitor and a first-stage monitoring end respectively, one end of the first-stage resistor connected with the input end of the first-stage energy conversion module is connected with one end of a third-stage resistor, the other end of the third-stage resistor is connected with one end of the first-stage capacitor, one end of the second-stage capacitor, one end of a fifth-stage resistor and a third-stage monitoring end respectively, one end of the first-stage inductor connected with a first-stage control switch is connected with one end of a fourth-stage resistor, and the other end of the fourth-stage resistor, the other end of the fifth-stage resistor and the other end of the second-stage capacitor are connected with the second-stage monitoring end;

The first-stage monitoring unit is used for acquiring voltage value signals at two ends of the first-stage resistor through the first-stage monitoring end, the second-stage monitoring end and the third-stage monitoring end, and sending the voltage value signals at two ends of the first-stage resistor to the first-stage control module, so that the first-stage control module calculates the current of the first-stage inductor according to the voltage value signals at two ends of the first-stage resistor and the resistance value of the first-stage resistor, and adjusts the on-off time of the first-stage control switch and the second-stage control switch according to the current of the first-stage inductor.

Alternatively, the structure of the secondary control module is identical to the structure of the primary control module of any one of the above.

Optionally, the primary control module includes: the system comprises a first-stage control unit, a first-stage voltage dividing unit and a first-stage feedback compensation unit;

the first-stage control unit is respectively connected with the first-stage voltage dividing unit and the first-stage feedback compensation unit, the first-stage voltage dividing unit is connected with the input end of each first-stage energy conversion module, and the first-stage feedback compensation unit is connected with the digital ground;

the primary voltage dividing unit is used for providing the self voltage dividing condition for the primary control unit;

the primary feedback compensation unit is used for providing a primary reference voltage for the primary control unit;

The first-stage control unit is used for sending a first-stage control signal to each first-stage driving module, adjusting the working state of the first-stage control unit according to the voltage division condition in the first-stage voltage division unit, and adjusting the output voltage of at least one first-stage energy conversion module according to the first-stage reference voltage.

Optionally, the secondary control module includes: the device comprises a secondary control unit, a secondary pressure-dividing unit and a secondary feedback compensation unit;

the secondary control unit is respectively connected with the secondary voltage dividing unit and the secondary feedback compensation unit, the secondary voltage dividing unit is connected with the input end of each secondary energy conversion module, and the secondary feedback compensation unit is connected with the digital ground;

the secondary pressure-dividing unit is used for providing the pressure-dividing condition of the secondary control unit;

the secondary feedback compensation unit is used for providing a secondary reference voltage for the secondary control unit;

the secondary control unit is used for sending a secondary control signal to each secondary driving module, adjusting the working state of the secondary control unit according to the voltage division condition in the secondary voltage division unit, and adjusting the output voltage of at least one secondary energy conversion module according to the secondary reference voltage.

In a second aspect, the present utility model provides a DC-DC power supply comprising a wide voltage input power conversion circuit as in any one of the preceding claims.

The wide-voltage input power supply conversion circuit and the DC-DC power supply provided by the embodiment of the utility model form a first-stage control circuit through the first-stage control module, the plurality of first-stage driving modules and the plurality of first-stage energy conversion modules, and form a second-stage control circuit through the second-stage control module, the plurality of second-stage driving modules and the plurality of second-stage energy conversion modules, so that the wide-voltage input power supply conversion circuit can flexibly regulate and control the output current of the circuit, and meanwhile, when the number of the first-stage driving modules, the first-stage energy conversion modules, the second-stage driving modules and the second-stage energy conversion modules reaches a certain number, the input voltage of the wide-voltage input power supply conversion circuit can meet the requirements of electronic equipment with power consumption smaller than 300W and can also meet the requirements of the electronic equipment with power consumption larger than 300W after the input voltage of the first-stage control circuit is subjected to step-up control of the first-stage control circuit and the second-stage control circuit.

Drawings

FIG. 1 is a schematic block diagram of a wide voltage input power conversion circuit according to an embodiment of the present application;

FIG. 2 is a circuit diagram of a first stage voltage divider unit according to an embodiment of the present disclosure;

FIG. 3 is a partial circuit diagram of a primary control unit according to an embodiment of the present application;

FIG. 4 is a circuit diagram of a two-stage voltage division unit according to an embodiment of the present application;

FIG. 5 is a partial circuit diagram of a secondary control unit according to an embodiment of the present application;

FIG. 6 is a partial circuit diagram of a primary control unit according to an embodiment of the present application;

FIG. 7 is a partial circuit diagram of a secondary control unit according to an embodiment of the present application;

FIG. 8 is a circuit diagram of a primary energy conversion module according to an embodiment of the present application;

FIG. 9 is a circuit diagram of a primary driving module according to an embodiment of the present application;

FIG. 10 is a circuit diagram of a secondary energy conversion module according to an embodiment of the present application;

fig. 11 is a circuit diagram of a two-stage driving module according to an embodiment of the present application.

Reference numerals

10. A primary control module; 11. a first-stage control unit; 12. a first-stage voltage dividing unit; 13. a first-stage feedback compensation unit; 20. a primary driving module; 30. a primary energy conversion module; 31. a first primary control switch; 32. a second stage control switch; 33. a primary inductor; 34. the first primary energy storage filtering unit; 35. a second-stage energy storage filtering unit; 36. a primary monitoring unit; 40. a secondary control module; 41. a secondary control unit; 42. a second-stage pressure-dividing unit; 43. a secondary feedback compensation unit; 50. a secondary driving module; 60. a secondary energy conversion module; 61. a first secondary control switch; 62. a second-stage control switch; 63. a secondary inductance; 64. a first secondary energy storage filter unit; 65. a second secondary energy storage filtering unit; 66. and a secondary monitoring unit.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only 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.

It is noted that in the present utility model, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The present embodiment provides a wide-voltage input power conversion circuit having an input voltage range of 9V to 55V. Referring to fig. 1, the wide voltage input power conversion circuit includes: a primary control module 10, a secondary control module 40, a plurality of primary drive modules 20, a plurality of primary energy conversion modules 30, a plurality of secondary drive modules 50, and a plurality of secondary energy conversion modules 60.

The number of the primary driving module 20, the primary energy conversion module 30, the secondary driving module 50 and the secondary energy conversion module 60 is the same, and may be one or more. In the present embodiment, the number of the primary driving module 20, the primary energy conversion module 30, the secondary driving module 50 and the secondary energy conversion module 60 is six.

Six primary drive modules 20 are each connected to the primary control module 10, and six secondary drive modules 50 are each connected to the secondary control module 40. The six primary driving modules 20 are respectively connected with the six primary energy conversion modules 30 one by one. The six secondary driving modules 50 are respectively connected with the six secondary energy conversion modules 60 one by one. The input ends of the six primary energy conversion modules 30 are commonly used as the input ends of the wide-voltage input power supply conversion circuit, the output ends of the six primary energy conversion modules 30 are respectively connected with the input ends of one secondary energy conversion module 60, and the output ends of the six secondary energy conversion modules 60 are commonly used as the output ends of the wide-voltage input power supply conversion circuit.

In this way, one primary control module 10, six primary driving modules 20 and six primary energy conversion modules 30 constitute a primary control circuit, and a secondary control circuit is constituted by one secondary control module 40, six secondary driving modules 50 and six secondary energy conversion modules 60. Each primary energy conversion module 30 and one secondary energy conversion module 60 form one control IC, that is, six control ICs exist in the wide-voltage input power conversion circuit.

The primary control circuit and the secondary control circuit have substantially the same structure. The difference between the primary control circuit and the secondary control circuit is mainly that the input and output connections of the primary control circuit and the secondary control circuit are different, so that signals transmitted between units with the same structure are different; furthermore, since the primary control circuit is used for boosting and the secondary control circuit is used for reducing, the primary control circuit and the secondary control circuit are different in operation mode.

Specifically, with reference to fig. 2 and 3, the primary control module 10 includes: a primary control unit 11, a primary voltage dividing unit 12 and a primary feedback compensation unit 13. Referring to fig. 4 and 5, the secondary control module 40 includes: a secondary control unit 41, a secondary pressure reduction unit 42 and a secondary feedback compensation unit 43. Wherein, the primary control unit 11 and the secondary control unit 41 are both control chips; the structures of the primary voltage dividing unit 12 and the primary feedback compensation unit 13 are the same as those of the secondary voltage dividing unit 42 and the secondary feedback compensation unit 43, respectively; the control chip 54Pin determines whether its own working mode is BUCK mode or BOOST mode by pull-up and pull-down. Referring to fig. 6 and fig. 7, in the present embodiment, the 54Pin of the primary control unit 11 is connected to the digital ground through a resistor R120, and the working mode is a BOOST mode; the second control unit 41 has a working mode of BUCK mode, in which 54Pin is connected to the voltage terminal VCC5 via a resistor R119.

Further, the primary control unit 11 is connected to the primary voltage dividing unit 12 and the primary feedback compensation unit 13, respectively. The primary voltage dividing unit 12 is connected with the input ends of the plurality of primary energy conversion modules 30, and the primary feedback compensation unit 13 is connected with digital ground.

Referring to fig. 2 and 3, the first stage voltage dividing unit 12 includes: a first stage is grounded, resistor R113, resistor R112, capacitor C89, resistor R114, resistor R115, and capacitor C90. The resistor R113 has a resistance of 200 Kohm, the resistor R112 has a resistance of 10 Kohm, the resistor R114 has a resistance of 2 Mohm, and the resistor R115 has a resistance of 30.9 Kohm; the first-stage grounding terminal is grounded digitally; one end of the resistor R113 and one end of the resistor R114 are connected with an input end VCCIN of the wide-voltage input power supply conversion circuit; the resistor R112 and the capacitor C89 are connected between the other end of the resistor R113 and the first-stage voltage division ground terminal in parallel; resistor R115 and capacitor C90 are connected between the other end of resistor R114 and the first-stage voltage division ground; the other end of the resistor R113 is also connected with 14Pin in the primary control unit 11; the other end of the resistor R114 is also connected to 13Pin in the primary control unit 11.

In the working process of the primary voltage dividing unit 12, the resistor R113 and the resistor R112 are divided and then filtered to the primary control unit 11 through the capacitor C89, and the resistor R114 and the resistor R115 are divided and then filtered to the primary control unit 11 through the capacitor C90. The primary control unit 11 determines whether the input VCCIN is under-voltage or over-voltage according to the magnitude of the divided voltage. In the embodiment, when the voltage division between the resistor R113 and the resistor R112 is less than 1.2V detected by the 14Pin of the primary control unit 11, the input end VCCIN is determined as an under-voltage, and then the 35Pin of the primary control unit 11 is pulled down after 120us delay, and the primary control unit 11 continues to operate in the Boost mode. When 13Pin of the primary control unit 11 detects that the voltages of R114 and R115 are higher than 1.2V, the primary control unit 11 stops working.

Referring to fig. 4, 5 and 7, for the secondary control unit 41, when the voltage division between the resistor R113 and the resistor R112 is less than 1.2V detected by the 14Pin of the secondary control unit 41, the input end VCCIN is judged to be under voltage, and then the 35Pin of the secondary control unit 41 is pulled down after 120us of delay, and the secondary control unit 41 stops working in the Buck mode. When 13Pin of the secondary control unit 41 detects that the voltages of R114 and R115 are higher than 1.2V, the secondary control unit 41 will stop working.

The primary feedback compensation unit 13 includes: the first-stage compensation ground, resistor R98, capacitor C64, capacitor C63, resistor R97, capacitor C62 and capacitor C61. The resistor R98 and the capacitor C64 are connected in series, the resistor R98 and the capacitor C64 connected in series are connected in parallel with the capacitor C63, one end of the capacitor C64 and one end of the capacitor C63 are connected with the first-stage compensation grounding end together, and one end of the resistor R98 and the other end of the capacitor C63 are connected with the 4Pin of the first-stage control unit 11 together. The primary compensation ground is digitally grounded. The resistor R97 and the capacitor C62 are connected in series, the resistor R97 and the capacitor C62 which are connected in series are connected in parallel with the capacitor C61, one end of the capacitor C61 and one end of the capacitor C62 are connected with the first-stage compensation grounding end together, and one end of the resistor R97 and the other end of the capacitor C61 are connected with the 6Pin of the first-stage control unit 11 together. The primary control unit 11 adjusts the output voltage of at least one primary energy conversion module 30 according to the primary reference voltage by using the voltage values read by the primary control units 4Pin and 6Pin as the primary reference voltage.

Since the structure of the second stage partial pressure unit 42 is the same as that of the first stage partial pressure unit 12, the description of this embodiment is omitted. The voltage values read by the secondary control unit 41 through the respective 4Pin and 6Pin are used as secondary reference voltages, and the output voltage of at least one secondary energy conversion module 60 is adjusted according to the secondary reference voltages.

It should be noted that the primary driving module 20 is configured to convert the primary control signal into a readable signal, such as a primary control signal, that can be recognized by the primary energy conversion module 30. Likewise, the secondary driving module 50 is configured to convert the secondary control signal into a readable signal, such as a secondary control signal, that can be recognized by the secondary energy conversion module 60.

Specifically, referring to fig. 1 and 6, the primary control unit 11 sends 6 sets of primary control signals to the six primary driving modules 20 through its own 29Pin, 31Pin, 32Pin, 33Pin, 34Pin, and 36Pin, respectively, and each primary driving module 20 processes the received primary control signal and then sends a primary regulation signal to the corresponding primary energy conversion module 30, so as to increase the output voltage of the primary energy conversion module 30 to be higher than the input voltage of the primary energy conversion module 30, or make the output voltage of the primary energy conversion module 30 equal to the input voltage of the primary energy conversion module 30.

Referring to fig. 1 and 7, as well, the secondary control unit 41 sends 6 sets of secondary control signals to the six secondary driving modules 50 through its own 29Pin, 31Pin, 32Pin, 33Pin, 34Pin and 36Pin, respectively, and each secondary driving module 50 processes the received secondary control signals and then sends a secondary regulation signal to the corresponding secondary energy conversion module 60 to increase the output voltage of the secondary energy conversion module 60 to be higher than the input voltage of the secondary energy conversion module 60 or to make the output voltage of the secondary energy conversion module 60 equal to the input voltage of the secondary energy conversion module 60.

In this embodiment, the primary control signal and the secondary control signal are PWM (Pulse Width Modulation ) signals, and the primary control signal includes: phase signal (Phase signal), HG (High Gate) drive signal, and LG (Low Gate) drive signal. Wherein, the HG driving signal is used for controlling the on-off of the first primary control switch 31; the LG driving signal is used to control the on-off of the second-stage control switch 32.

Further, in connection with fig. 8, the primary energy conversion module 30 includes: the first primary control switch 31, the second primary control switch 32, the primary inductor 33, the first primary energy storage filter unit 34, the second primary energy storage filter unit 35 and the primary monitoring unit 36. The first primary energy storage filter unit and the second primary energy storage filter unit are both used for storing energy and filtering the voltage in the primary energy conversion module 30.

Specifically, the first one-stage control switch 31 includes: the first primary control end, the first primary connecting end and the second primary connecting end. The second stage control switch 32 includes: the second-stage control end, the third-stage connecting end and the fourth-stage connecting end.

Referring to fig. 8 and 9, the first primary control end is connected to 11Pin and 8Pin of the primary driving module 20 through a resistor R49 and the second primary control end through a resistor R50, the first primary connection end is connected to the input ends of the first primary energy storage filter unit 34 and the secondary energy conversion module 60, the 12Pin of the primary driving module 20 is connected to one end of the primary inductor 33 through a connection resistor R38 and a capacitor C35, the second primary connection end, the 10Pin of the primary driving module 20, and the third primary connection end, respectively, and the other end of the primary inductor 33 is connected to the input end of the primary energy conversion module 30 through the primary monitoring unit 36; one end of the second-stage energy storage filtering unit 35 is connected with the input end of the first-stage energy conversion module 30, and the other end of the second-stage energy storage filtering unit 35 is grounded; the primary monitoring unit 36 is connected to the primary control module 10.

The first primary control end is used for controlling the on-off relation of the first primary connecting end and the second primary connecting end, and the second primary control end is used for controlling the on-off relation of the third primary connecting end and the fourth primary connecting end. The primary driving module 20 is configured to send primary control signals to the first primary control end and the second primary control end, so that the first primary connection end and the second primary connection end are kept in communication with one set of connection ends of the third primary connection end and the fourth primary connection end, and the other set of connection ends are kept disconnected.

The first primary control switch 31 and the second primary control switch 32 may be one of a triode and a mos (field effect) transistor, but are not limited thereto. In this embodiment, the first primary control switch 31 and the second primary control switch 32 are mos transistors. The first primary control end and the second primary control end are gates of mos tubes, namely G poles; the first primary connecting end and the third primary connecting end are sources of mos tubes, namely S poles; the second-stage connecting end and the fourth-stage connecting end are drain electrodes of the mos tube, namely D poles.

The primary driving module 20 and the primary energy conversion module 30 operate as follows during one cycle:

after the primary driving module 20 receives the primary control signal distributed by the primary control unit 11, the primary driving module 20 processes the primary control signal; then, the 10Pin and 12Pin of the first-stage driving module 20 send Phase signals to the D pole of the mos transistor Q1 and the S pole of the mos transistor Q2 and the 1Pin of the first-stage inductor 33 through the resistor R20 and the capacitor C17; meanwhile, 11Pin of the primary driving module 20 sends a high-level HG driving signal to the G pole of the mos tube Q1 through a resistor R18, 8Pin of the primary driving module 20 sends a low-level LG driving signal to the G pole of the mos tube Q2 through a resistor R19, so that the mos tube Q1 is conducted, the mos tube Q2 is disconnected, and even if the first primary connecting end and the second primary connecting end are kept connected, the third primary connecting end and the fourth primary connecting end are kept disconnected; after a specified time has elapsed, 11Pin of the primary driving module 20 sends a low-level HG driving signal to the G pole of the mos transistor Q1 through the resistor R18, 8Pin of the primary driving module 20 sends a high-level LG driving signal to the G pole of the mos transistor Q2 through the resistor R19, so that the mos transistor Q1 is turned off, the mos transistor Q2 is turned on, even if the first primary connection terminal and the second primary connection terminal remain turned off, and the third primary connection terminal and the fourth primary connection terminal remain turned on. The above specified time is calculated by the primary monitoring unit 36 according to the monitored current at the primary inductor 33, that is, the specified time determines the on-off time of the first primary control switch 31 and the second primary control switch 32. The on-off time of the first and second primary control switches 31 and 32 determines the output voltage of the primary energy conversion module 30.

When the mos transistor Q1 in the primary capacity conversion module is turned on and the mos transistor Q2 is turned off, the input voltage of the input end VCCIN is filtered by the second primary energy storage filtering unit 35, and then reaches the D pole of the mos transistor Q1 and the S pole of the mos transistor Q2 through the primary monitoring unit 36 and the primary inductor 33, and starts to store energy in the primary inductor 33 and the primary energy storage, and simultaneously supplies power to the input end of the secondary energy conversion module 60. At this time, the output voltage of the primary energy conversion module 30 is equal to the input voltage of the primary energy conversion module 30 plus the voltage across the primary inductor 33.

When the mos transistor Q1 in the primary capability conversion module is turned off and the mos transistor Q2 is turned on, the input end VCCIN, the second primary energy storage filter unit 35, the primary monitoring unit 36, the primary inductor 33 and the mos transistor Q2 form a loop, and begin to store energy in the primary inductor 33. At this time, the output end of the primary energy conversion module 30 supplies power to the input end of the secondary energy conversion module 60 through the first primary energy storage filter unit 34. At this time, the output voltage of the primary energy conversion module 30 is equal to the input voltage of the primary energy conversion module 30.

Thus, after one period of conversion, the primary driving module 20 regulates the on-off time of the mos transistors Q1 and Q2 according to the primary control signal, and the primary energy conversion module 30 can realize stable output VCC60 under the filtering action of the filtering unit at the same time, that is, the output voltage of the primary energy conversion module 30 is increased to 60V.

In this embodiment, the first primary energy storage filter unit 34 includes four parallel first primary energy storage filter capacitors, which are a capacitor CE16, a capacitor C80, a capacitor C81, and a capacitor C82. The second stage energy storage filter unit 35 includes four second stage energy storage filter capacitors connected in parallel, which are a capacitor CE1, a capacitor CE2, a capacitor C22 and a capacitor C23. One end of the four first primary energy storage filter capacitors is connected with the first connecting end as an output end of the primary energy conversion module 30 and an input end of the secondary energy conversion module 60 together, and the other ends of the four first primary energy storage filter capacitors are grounded; one end of the four second-stage energy storage filter capacitors is connected with the input end of the first-stage energy conversion module 30, and the other ends of the four second-stage energy storage filter capacitors are grounded.

The primary monitoring unit 36 includes: the first primary monitoring end, the second primary monitoring end, the third primary monitoring end, the first primary resistor, the second primary resistor, the third primary resistor, the fourth primary resistor, the fifth primary resistor, the first primary capacitor and the second primary capacitor.

The 2 feet of the primary inductor 33 are connected with the input end of the primary energy conversion module 30 through a first primary resistor, one end of a second primary resistor is connected with one end of the primary resistor connected with the primary inductor 33, the other end of the second primary resistor is connected with one end of the first primary capacitor and the first primary monitoring end, one end of a third primary resistor is connected with one end of the first primary resistor connected with the input end of the primary energy conversion module 30, the other end of the third primary resistor is connected with one end of the first primary capacitor, one end of the second primary capacitor, one end of the fifth primary resistor and the third primary monitoring end, one end of the fourth primary resistor is connected with the 1 foot of the primary inductor 33, and the other end of the fourth primary resistor, the other end of the fifth primary resistor and the other end of the second primary capacitor are all connected with the second primary monitoring end.

The primary monitoring unit 36 is configured to obtain voltage value signals of two ends of the first primary resistor through the first primary monitoring end, the second primary monitoring end and the third primary monitoring end, send the voltage value signals of two ends of the first primary resistor to the primary control module 10, so that the primary control module 10 calculates a current of the primary inductor 33 according to the voltage value signals of two ends of the first primary resistor and a resistance value of the first primary resistor, and adjust on-off time of the first primary control switch 31 and the second primary control switch 32 according to the current of the primary inductor 33.

In the present embodiment, 17Pin to 25Pin and 56Pin to 64Pin of the primary control unit 11 are connected to the first primary monitoring terminal, the second primary monitoring terminal and the third primary monitoring terminal of one primary monitoring unit 36, respectively, in groups of three.

Specifically, a first-stage control unit 11 obtains the SAC1 VCC12 signal in the second-stage monitoring terminal, the SN1 VCC12 signal in the third-stage monitoring terminal, and the SDC1 VCC12 signal in the first-stage monitoring terminal through its own 17Pin, 18Pin, and 19Pin, respectively, calculates the voltages at both ends of the first-stage resistor, and then calculates the current flowing through the first-stage inductor 33 according to the voltages at both ends of the first-stage resistor and the resistance value of the first-stage resistor. The first-stage control unit 11 forms a differential signal from the SAC1 VCC12 signal in the second-stage monitoring terminal and the SN1 VCC12 signal in the third-stage monitoring terminal to participate in the calculation of the voltages at the two ends of the first-stage resistor.

After the primary control unit 11 obtains the current flowing through the primary inductor 33, the voltage at both ends of the primary inductor 33 is calculated and compared with the reference voltage read by the primary control unit 11 through the primary control unit's own 4Pin and the primary control unit's own 6Pin, if the voltage at both ends of the primary inductor 33 is lower than the value of 6Pin, the on time of the mos transistor Q1 needs to be increased, and if the voltage at both ends of the primary inductor 33 is higher than the value of 4Pin, the on time of the mos transistor Q1 needs to be reduced.

The on time of the mos transistor Q1 is increased, that is, the on time of the mos transistor Q2 is correspondingly reduced. The way to adjust the on time of the mos transistor Q1 is to adjust the first-stage control signal, so that the corresponding first-stage driving module 20 adjusts the durations of the HG driving signal and the LG driving signal sent to the mos transistor Q1 and the mos transistor Q2 respectively, and adjusts the duty ratio and the frequency of the Phase signal accordingly. The duty cycle of the Phase signal refers to the ratio of the G-high level time of the mos transistor Q1 to the sum of the G-high level and the low level time. If the on-time of the mos transistor Q1 needs to be increased, the duration of sending the HG driving signal to the mos transistor Q1 needs to be increased.

Referring to fig. 10 and 11, the secondary energy conversion module 60 includes: the first secondary control switch 61, the second secondary control switch 62, the secondary inductor 63, the first secondary energy storage filtering unit 64, the second secondary energy storage filtering unit 65 and the secondary monitoring unit 66.

Specifically, the first secondary control switch 61 includes: the first secondary control end, the first secondary connecting end and the second secondary connecting end. The second-stage control switch 62 includes: the second-stage control end, the third-stage connecting end and the fourth-stage connecting end. The secondary monitoring unit 66 includes: the first secondary monitoring end, the second secondary monitoring end, the third secondary monitoring end, the first secondary resistor, the second secondary resistor, the third secondary resistor, the fourth secondary resistor, the fifth secondary resistor, the first secondary capacitor and the second secondary capacitor. The first secondary tank filter unit 64 includes four first secondary tank filter capacitors connected in parallel. The second secondary tank filter unit 65 comprises four second secondary tank filter capacitors connected in parallel.

Further, the connection relationship and the internal structure of the first secondary control switch 61, the second secondary control switch 62, the secondary inductor 63 and the secondary monitoring unit 66 are the same as the connection relationship and the internal structure of the first primary control switch 31, the second primary control switch 32, the primary inductor 33 and the primary monitoring unit 36. The secondary energy conversion module 60 differs from the primary energy conversion module 30 in that; the position and internal structure of the second-stage energy storage filter unit 35 are the position and internal structure of the first-stage energy storage filter unit 64 in the second-stage energy conversion module 60, and the position and internal structure of the first-stage energy storage filter unit 34 are the position and internal structure of the second-stage energy storage filter unit 65 in the second-stage energy conversion module 60.

The operation of the secondary drive module 50 and the secondary energy conversion module 60 during one cycle is as follows:

after the secondary driving module 50 receives the secondary control signal distributed by the secondary control unit 41, the secondary driving module 50 processes the secondary control signal; then, the 10Pin and 12Pin of the second-stage driving module 50 send Phase signals to the D pole of the mos transistor Q1 and the S pole of the mos transistor Q2 and the 1Pin of the second-stage inductor 63 through the resistor R20 and the capacitor C17; meanwhile, 11Pin of the secondary driving module 50 sends a high-level HG driving signal to the G pole of the mos tube Q1 through a resistor R18, and 8Pin of the secondary driving module 50 sends a low-level LG driving signal to the G pole of the mos tube Q2 through a resistor R19 so as to conduct the mos tube Q1 and disconnect the mos tube Q2; after a specified time, 11Pin of the secondary driving module 50 sends a low-level HG driving signal to the G pole of the mos transistor Q1 through the resistor R18, and 8Pin of the secondary driving module 50 sends a high-level LG driving signal to the G pole of the mos transistor Q2 through the resistor R19, so that the mos transistor Q1 is turned off and the mos transistor Q2 is turned on. The above specified time is calculated by the secondary monitoring unit 66 according to the monitored current at the secondary inductor 63, that is, the specified time determines the on-off time of the first secondary control switch 61 and the second secondary control switch 62. The on-off time of the first secondary control switch 61 and the second secondary control switch 62 determines the output voltage of the secondary energy conversion module 60.

When the mos transistor Q1 in the second-stage capacity conversion module is turned on and the mos transistor Q2 is turned off, the input voltage of the input terminal VCC60 is filtered by the second-stage energy storage filter unit 65, and then the second-stage inductor 63 and the second-stage energy storage are started to store energy through the S pole of the mos transistor Q1, and meanwhile, power is supplied to the output terminal of the second-stage energy conversion module 60. At this time, the output voltage of the secondary energy conversion module 60 is equal to the input VCC60 minus the voltage across the secondary inductor 63.

When the mos transistor Q1 in the second-stage capacity conversion module is turned off and the mos transistor Q2 is turned on, the output VCC12 of the second-stage energy conversion module 60, the first second-stage energy storage filter unit 64, the second-stage monitoring unit 66, the second-stage inductor 63 and the mos transistor Q2 form a loop, and the energy stored by the second-stage inductor 63 and the second-stage energy storage power source starts to be released. At this time, the output VCC12 of the secondary energy conversion module 60 supplies power to the load through the first secondary energy storage filter unit 64. At this time, the output voltage of the secondary energy conversion module 60 is equal to the voltage across the secondary inductor 63, and the voltage across the secondary inductor 63 will be filtered to achieve stable voltage output.

Thus, after one period of conversion, the two-stage driving module 50 regulates the on-off time of the mos transistors Q1 and Q2 according to the two-stage control signal, the two-stage energy conversion module 60 can realize stable output VCC12 under the filtering action of the filtering unit at the same time, that is, the output voltage of the two-stage energy conversion module 60 is reduced to 12V, and under the common output of the six control ICs, the output end of the wide-voltage input power conversion circuit can meet the requirement of 1500W electronic equipment.

The primary energy conversion module and the secondary energy conversion module are respectively controlled by the primary control module and the secondary control module, so that the flexibility of regulating and controlling the output current of the wide-voltage input power supply conversion circuit is improved. Meanwhile, the wide-voltage input power supply conversion circuit supports 9-55V wide-voltage input, the output 12V can meet 1500W, six paths of parallel control ICs are adopted, the conduction loss of each path of mos tube and inductance is reduced, the conversion efficiency is high, and the heat dissipation effect is good.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (10)

1. A wide voltage input power conversion circuit, comprising: the system comprises a first-stage control module, a second-stage control module, a plurality of first-stage driving modules, a plurality of first-stage energy conversion modules, a plurality of second-stage driving modules and a plurality of second-stage energy conversion modules;

The number of the primary driving modules, the primary energy conversion modules, the secondary driving modules and the secondary energy conversion modules is the same, each primary driving module is connected with the primary control module, each secondary driving module is connected with the secondary control module, each primary driving module is connected with one primary energy conversion module, each secondary driving module is connected with one secondary energy conversion module, the input ends of the primary energy conversion modules are used as the input ends of the wide-voltage input power supply conversion circuit together, the output ends of the primary energy conversion modules are connected with the input ends of one secondary energy conversion module, and the output ends of the secondary energy conversion modules are used as the output ends of the wide-voltage input power supply conversion circuit together;

the primary control module is used for sending a primary control signal to each primary driving module so that the output voltage of at least one primary energy conversion module is higher than the input voltage of the primary energy conversion module;

the secondary control module is used for sending a secondary control signal to each secondary driving module so that the output voltage of at least one secondary energy conversion module is lower than the input voltage of the secondary energy conversion module.

2. The wide voltage input power conversion circuit of claim 1, wherein the primary energy conversion module comprises: the first primary control switch, the second primary control switch, the primary inductor and the first primary energy storage filter unit;

the first one-level control switch includes: the first primary control end, first primary link and second primary link, second primary control switch includes: the second-stage control end, the third-stage connecting end and the fourth-stage connecting end;

the first primary control end and the second primary control end are connected with the primary driving module, the first primary connecting end is connected with the first primary energy storage filtering unit and the secondary energy conversion module, the second primary connecting end is connected with the third primary connecting end and one end of the primary inductor respectively, and the other end of the primary inductor is connected with the input end of the primary energy conversion module;

the first primary control end is used for controlling the on-off relation of the first primary connection end and the second primary connection end, and the second primary control end is used for controlling the on-off relation of the third primary connection end and the fourth primary connection end;

The first-stage driving module is used for sending a first-stage regulation signal to the first-stage control end and the second-stage control end so that the first-stage connecting end and the second-stage connecting end are communicated with one group of connecting ends in the third-stage connecting end and the fourth-stage connecting end, and the other group of connecting ends are disconnected;

the first primary energy storage filtering unit is used for storing energy and filtering the voltage in the primary energy conversion module.

3. The wide-voltage input power conversion circuit according to claim 2, wherein the first primary energy storage filter unit comprises a plurality of first primary energy storage filter capacitors connected in parallel;

one end of the first primary energy storage filter capacitor is connected with the second-stage energy conversion module, and the other end of the first primary energy storage filter capacitor is grounded.

4. The wide voltage input power conversion circuit of claim 2, wherein the primary energy conversion module further comprises: a second-stage energy storage filtering unit;

one end of the second-stage energy storage filtering unit is connected with the input end of the first-stage energy conversion module, and the other end of the second-stage energy storage filtering unit is grounded;

The second stage energy storage filtering unit is used for storing energy and filtering the voltage in the first stage energy conversion module.

5. The wide-voltage input power conversion circuit according to claim 4, wherein the second-stage energy storage filter unit comprises a plurality of second-stage energy storage filter capacitors connected in parallel;

one end of the second-stage energy storage filter capacitor is connected with the input end of the first-stage energy conversion module, and the other end of the second-stage energy storage filter capacitor is grounded.

6. The wide voltage input power conversion circuit of claim 2, wherein the primary energy conversion module further comprises: a primary monitoring unit;

the primary monitoring unit is connected with the primary control module and the primary inductor;

the primary monitoring unit is used for monitoring the current of the primary inductor and feeding back the current to the primary control module, so that the primary control module adjusts the on-off time of the first primary control switch and the second primary control switch according to the current of the primary inductor.

7. The wide voltage input power conversion circuit of claim 6, wherein the primary monitoring unit comprises: the first primary monitoring end, the second primary monitoring end, the third primary monitoring end, the first primary resistor, the second primary resistor, the third primary resistor, the fourth primary resistor, the fifth primary resistor, the first primary capacitor and the second primary capacitor;

The first primary inductor is connected with the input end of the first primary energy conversion module through the first primary resistor, one end of the first primary resistor connected with the first primary inductor is connected with one end of the second primary resistor, the other end of the second primary resistor is connected with one end of the first primary capacitor and the first primary monitoring end respectively, one end of the first primary resistor connected with the input end of the first primary energy conversion module is connected with one end of the third primary resistor, the other end of the third primary resistor is connected with one end of the first primary capacitor, one end of the second primary capacitor, one end of the fifth primary resistor and the third primary monitoring end respectively, one end of the first primary inductor connected with the first primary control switch is connected with one end of the fourth primary resistor, and the other end of the fourth primary resistor, the other end of the fifth primary resistor and the other end of the second primary capacitor are connected with the first primary monitoring end respectively;

the first-stage monitoring unit is used for acquiring voltage value signals at two ends of the first-stage resistor through the first-stage monitoring end, the second-stage monitoring end and the third-stage monitoring end, and sending the voltage value signals at two ends of the first-stage resistor to the first-stage control module, so that the first-stage control module calculates the current of the first-stage inductor according to the voltage value signals at two ends of the first-stage resistor and the resistance value of the first-stage resistor, and adjusts the on-off time of the first-stage control switch and the second-stage control switch according to the current of the first-stage inductor.

8. The wide voltage input power conversion circuit according to any one of claims 2 to 7, wherein a structure of the secondary control module is identical to a structure of the primary control module.

9. The wide voltage input power conversion circuit of claim 1, wherein the primary control module comprises: the system comprises a first-stage control unit, a first-stage voltage dividing unit and a first-stage feedback compensation unit;

the first-stage control unit is respectively connected with the first-stage voltage dividing unit and the first-stage feedback compensation unit, the first-stage voltage dividing unit is connected with the input end of each first-stage energy conversion module, and the first-stage feedback compensation unit is connected with digital ground;

the primary voltage dividing unit is used for providing the primary control unit with the self voltage dividing condition;

the primary feedback compensation unit is used for providing a primary reference voltage for the primary control unit;

the first-stage control unit is used for sending a first-stage control signal to each first-stage driving module, adjusting the working state of the first-stage control unit according to the voltage division condition in the first-stage voltage division unit, and adjusting the output voltage of at least one first-stage energy conversion module according to the first-stage reference voltage.

10. A DC-DC power supply comprising the wide voltage input power conversion circuit of any one of claims 1 to 9.

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