CN220605772U - Synchronous voltage reduction circuit based on motor driver - Google Patents
Synchronous voltage reduction circuit based on motor driver Download PDFInfo
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- CN220605772U CN220605772U CN202321620786.8U CN202321620786U CN220605772U CN 220605772 U CN220605772 U CN 220605772U CN 202321620786 U CN202321620786 U CN 202321620786U CN 220605772 U CN220605772 U CN 220605772U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses synchronous BUCK circuit based on motor driver, including the MCU module that connects gradually end to end, BUCK BUCK circuit and voltage current acquisition circuit, the MCU module produces adjustable low voltage PWM pulse and sends to BUCK BUCK circuit, BUCK BUCK circuit carries out the wave filtering with adjustable low voltage PWM pulse and forms direct current, voltage current acquisition circuit detects output current and output voltage, the drain electrode of first MOS pipe is connected respectively to the input of BUCK BUCK circuit, and ground through input capacitance, the drain electrode and the inductance of second MOS pipe are connected respectively to the source electrode of first MOS pipe, MCU module is connected through output capacitance ground to the inductance, and the one end of first resistance is connected respectively to the other end of first resistance, MCU module is connected with ground through the second resistance, utilize the occupation space of integrated form motor driver less, the degree of integration is higher, the power level is lower characteristics, be applied to multichannel accurate, the occasion that power is less and the space is limited.
Description
Technical Field
The application relates to the technical field of synchronous buck power supply, in particular to a synchronous buck circuit based on a motor driver.
Background
The step-down circuit is an electronic circuit capable of reducing a high voltage to a desired low voltage, and is based on the principle that the voltage reduction is achieved by using elements such as an inductor, a capacitor, and a diode. The inductor converts electrical energy into magnetic energy and converts the magnetic energy back into electrical energy. In the step-down circuit, the inductance generates a change in voltage by a change in current. The capacitor stores charge between the two electrodes, and a change in voltage is generated by a change in charge. The diode can limit the current in one direction, and the voltage reduction is achieved by unidirectional conductivity. In practical application, the step-down circuit can be used in electronic equipment such as a power adapter, a voltage stabilizer, an LED driver and the like, and can realize efficient, stable and reliable circuit design by reasonably selecting element parameters and a circuit topology structure.
However, BUCK voltage step-down circuits in existing electronic products are commonly used. The multi-channel BUCK circuit is often implemented with multiple independent BUCK chips. The plurality of chips occupy more area and volume, and in some extreme cases with limited space, there is not too much space to accommodate so many chip arrangements, thus causing space constraint, affecting the production and manufacture of products, even the problem that the solution cannot be realized, and so on.
Disclosure of Invention
An object of the present application is to overcome the defects of the prior art, and provide a synchronous voltage reduction circuit based on a motor driver, and the half H-bridge motor driver formed by a first MOS tube and a second MOS tube can solve the problems that a plurality of independent BUCK chips occupy more area and volume in the prior art, thereby causing space constraint, affecting the production and manufacturing of products, even realizing the scheme, and the like.
The purpose of the application is realized through the following technical scheme:
in a first aspect, the present application proposes a synchronous voltage reduction circuit based on a motor driver, where the circuit includes an MCU module, a BUCK voltage reduction circuit and a voltage and current acquisition circuit, which are sequentially connected end to end, where the MCU module is configured to generate an adjustable low voltage PWM pulse and send the adjustable low voltage PWM pulse to the BUCK voltage reduction circuit, and the BUCK voltage reduction circuit is configured to convert the adjustable low voltage PWM pulse into an adjustable high voltage PWM pulse, and the voltage and current acquisition circuit is configured to detect an output current and an output voltage;
the BUCK step-down circuit comprises an input capacitor, a motor driver, an inductor and an output capacitor, wherein the motor driver comprises a first MOS tube and a second MOS tube, and the voltage and current acquisition circuit comprises a first resistor and a second resistor;
the input end of the BUCK step-down circuit is respectively connected with the drain electrode of the first MOS tube and is grounded through the input capacitor, the source electrode of the first MOS tube is respectively connected with the drain electrode of the second MOS tube and the inductor, the first MOS tube and the grid electrode of the second MOS tube are connected with the MCU module, the inductor is grounded through the output capacitor and is connected with one end of the first resistor, and the other end of the first resistor is respectively connected with the MCU module and is grounded through the second resistor.
In one possible implementation manner, the voltage and current acquisition circuit further comprises a third resistor and an operational amplifier, one end of the third resistor is connected with the inductor, and two ends of the third resistor are connected to the MCU module through the operational amplifier.
In a possible embodiment, the other end of the second resistor is connected to the output terminal.
In one possible embodiment, the inductor is used to convert the adjustable high voltage PWM pulse into a triangular wave pulse.
In one possible embodiment, the output capacitor is used to filter the triangular wave pulse to form direct current.
In one possible embodiment, the voltage and current acquisition circuit is further configured to output a constant voltage and a constant current.
In one possible implementation, the MCU module is further configured to adjust the duty cycle of the adjustable high voltage PWM pulses according to the output current and the output voltage.
The main scheme and each further option of the application can be freely combined to form a plurality of schemes, which are all schemes that can be adopted and claimed by the application; and the selection(s) of non-conflicting choices and other choices may be freely combined. Numerous combinations will be apparent to those skilled in the art upon review of the present application, and are not intended to be exhaustive or to be construed as limiting the scope of the utility model.
The application discloses synchronous BUCK circuit based on motor driver, including the MCU module that connects gradually end to end, BUCK BUCK circuit and voltage current acquisition circuit, the MCU module produces adjustable low voltage PWM pulse and sends to BUCK BUCK circuit, BUCK BUCK circuit carries out the wave filtering with adjustable low voltage PWM pulse and forms direct current, voltage current acquisition circuit detects output current and output voltage, the drain electrode of first MOS pipe is connected respectively to the input of BUCK BUCK circuit, and ground through input capacitance, the drain electrode and the inductance of second MOS pipe are connected respectively to the source electrode of first MOS pipe, MCU module is connected through output capacitance ground to the inductance, and the one end of first resistance is connected respectively to the other end of first resistance, MCU module is connected with ground through the second resistance, utilize the occupation space of integrated form motor driver less, the degree of integration is higher, the power level is lower characteristics, be applied to multichannel accurate, the occasion that power is less and the space is limited.
Drawings
Fig. 1 shows a block diagram of a circuit configuration of a synchronous buck circuit according to an embodiment of the present application.
Icon: c1-an input capacitance; q1-a first MOS tube; q2-a second MOS tube; l1-inductance; c2-output capacitance; r1-a first resistor; r2-a second resistor; r3-a third resistor; y1-operational amplifier.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the prior art, BUCK voltage step-down devices are commonly used in voltage step-down circuits in electronic products. The multi-channel BUCK circuit is often implemented with multiple independent BUCK chips. The plurality of chips occupy more area and volume, and in some extreme cases with limited space, there is not too much space to accommodate so many chip arrangements, thus causing space constraint, affecting the production and manufacture of products, even the problem that the solution cannot be realized, and so on.
In order to solve the problem that a plurality of BUCK step-down devices occupy more design space, and meanwhile, in order to realize high integration of circuits, the application provides a synchronous step-down circuit based on a motor driver.
Referring to fig. 1, fig. 1 shows a circuit configuration block diagram of a synchronous BUCK circuit according to an embodiment of the present application, where the circuit belongs to the field of synchronous BUCK power supply and is suitable for a low-power dense device, and the circuit includes an MCU module, a BUCK circuit and a voltage-current collection circuit, which are sequentially connected end to end, where the MCU module is configured to generate an adjustable low-voltage PWM pulse and send the adjustable low-voltage PWM pulse to the BUCK circuit, the BUCK circuit is configured to filter the adjustable low-voltage PWM pulse to form a direct current, and the voltage-current collection circuit is configured to detect an output current and an output voltage;
the BUCK step-down circuit comprises an input capacitor C1, a motor driver, an inductor L1 and an output capacitor C2, wherein the motor driver comprises a first MOS tube Q1 and a second MOS tube Q2, and the voltage and current acquisition circuit comprises a first resistor R1 and a second resistor R2;
the input end of the BUCK step-down circuit is respectively connected with the drain electrode of the first MOS tube Q1 and grounded through the input capacitor C1, the source electrode of the first MOS tube Q1 is respectively connected with the drain electrode of the second MOS tube Q2 and the inductor L1, the grid electrodes of the first MOS tube Q1 and the second MOS tube Q2 are connected with the MCU module, the inductor L1 is grounded through the output capacitor C2 and connected with one end of the first resistor R1, and the other end of the first resistor R1 is respectively connected with the MCU module and grounded through the second resistor R2.
By utilizing the principle of a switch synchronous voltage reducer, a PWM pin of the MCU module outputs an adjustable low-voltage PWM pulse to a BUCK voltage reducing circuit, working conditions are provided for the whole circuit, and a half H-bridge motor driver (a first MOS tube Q1 and a second MOS tube Q2) with an internal integrated MOSFET is contained in the BUCK voltage reducing circuit to convert the adjustable low-voltage PWM pulse into a high-voltage pulse wave with the same duty ratio. And a BUCK synchronous step-down device is formed by combining an inductor L1 and an output capacitor C2, high-voltage pulse waves are input into the inductor L1 and then converted into corresponding triangular waves, and stable direct current is formed after capacitive filtering. The digital control synchronous BUCK circuit is realized through the driving of the MCU module and the sampling feedback, and the BUCK synchronous BUCK is controlled by the MCU module.
The voltage and current acquisition circuit can accurately control and detect output voltage and output current, detect whether the output is over-current, short-circuit and the like, and can also perform CV (constant voltage output) and CC (constant current output) control.
The voltage and current acquisition circuit further comprises a third resistor R3 and an operational amplifier Y1, one end of the third resistor R3 is connected with the inductor L1, and two ends of the third resistor R3 are connected to the MCU module through the operational amplifier Y1.
The other end of the third resistor R3 is connected with the output end.
The inductor L1 is used for converting the adjustable high-voltage PWM pulse into a triangular wave pulse.
The output capacitor C2 is used for filtering the triangular wave pulse to form direct current.
The voltage and current acquisition circuit is also used for outputting constant voltage and constant current.
The MCU module is also used for adjusting the duty ratio of the adjustable high-voltage PWM pulse according to the output current and the output voltage.
In the voltage and current acquisition circuit, the middle of the first resistor R1 and the second resistor R2 is connected with an ADC acquisition interface of the MCU module and is used for acquiring output voltage data of the whole circuit, and two ends of the third resistor R3 are connected with an operational amplifier Y1 and are connected with another ADC acquisition interface of the MCU module through the operational amplifier Y1 and are used for acquiring output current data of the whole circuit.
Furthermore, the MCU module can also adaptively adjust the adjustable low-voltage PWM pulse according to the collected voltage and current data of the whole circuit so as to meet the requirement of the whole circuit. For example, in practical use, the output voltage may be directly configured according to the mode of "output voltage=input voltage×duty ratio", and the PWM duty ratio may be adjusted according to the detection result of the voltage and current, so as to achieve the set output voltage and current.
The PWM duty cycle adjustment process comprises the following steps:
step S1, electrifying the whole circuit;
s2, determining output voltage;
s3, determining an adjustable low-voltage PWM pulse;
s4, collecting output voltage through the MCU module;
step S5, judging whether the output voltage accords with a preset threshold value, if so, executing step S6, and if not, executing step S9;
s6, collecting output current through the MCU module;
step S7, judging whether the whole circuit is short-circuited, if yes, executing step S10, and if not, executing step S8;
s8, maintaining the duty ratio of the adjustable low-voltage PWM pulse;
step S9, the duty ratio of the adjustable low-voltage PWM pulse is adjusted, and step S3 is executed;
step S10, the output is closed, and step S3 is executed.
Furthermore, in one possible implementation, only 3 ICs (4-way half H-bridge motor drive ICs, 4-way current sampling ICs or 4-way operational amplifiers and MCU modules) and a small number of peripheral devices are required to be able to implement a 4-way independent digitally controlled adjustable BUCK converter. Layout and space are greatly saved and input voltages can be supported to a higher input range depending on the half H-bridge driver parameters. The conversion efficiency of each path can reach more than 80%, and the heating value of the multipath power supply is reduced.
The application utilizes a multi-channel and all-channel mutually independent half H-bridge motor driver as the main body of the digital BUCK step-down device, and software is operated to adjust according to the characteristics of the used half H-bridge motor driver so as to adapt to the voltage, current and protection characteristics of the used half H-bridge motor driver.
Therefore, the synchronous voltage reduction circuit disclosed by the application comprises an MCU module, a BUCK voltage reduction circuit and a voltage and current acquisition circuit which are sequentially connected end to end, wherein the MCU module generates adjustable low-voltage PWM pulses and sends the adjustable low-voltage PWM pulses to the BUCK voltage reduction circuit, the BUCK voltage reduction circuit filters the adjustable low-voltage PWM pulses to form direct current, the voltage and current acquisition circuit detects output current and output voltage, the input end of the BUCK voltage reduction circuit is respectively connected with the drain electrode of a first MOS tube and grounded through an input capacitor, the source electrode of the first MOS tube is respectively connected with the drain electrode of a second MOS tube and an inductor, the grid electrodes of the first MOS tube and the second MOS tube are connected with the MCU module, the inductor is grounded through the output capacitor and is connected with one end of a first resistor, the other end of the first resistor is respectively connected with the MCU module and grounded through the second resistor, and the characteristics of small occupied space, high integration degree and low power level of the integrated motor driver are utilized, and the synchronous voltage reduction circuit is applied to occasions with accurate numerical control and small power and limited space.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (7)
1. The synchronous voltage reduction circuit based on the motor driver is characterized by comprising an MCU module, a BUCK voltage reduction circuit and a voltage and current acquisition circuit which are connected end to end in sequence, wherein the MCU module is used for generating adjustable low-voltage PWM pulses and sending the adjustable low-voltage PWM pulses to the BUCK voltage reduction circuit, the BUCK voltage reduction circuit is used for filtering the adjustable low-voltage PWM pulses to form direct current, and the voltage and current acquisition circuit is used for detecting output current and output voltage;
the BUCK step-down circuit comprises an input capacitor, a motor driver, an inductor and an output capacitor, wherein the motor driver comprises a first MOS tube and a second MOS tube, and the voltage and current acquisition circuit comprises a first resistor and a second resistor;
the input end of the BUCK step-down circuit is respectively connected with the drain electrode of the first MOS tube and grounded through an input capacitor, the source electrode of the first MOS tube is respectively connected with the drain electrode of the second MOS tube and the inductor, the grid electrodes of the first MOS tube and the second MOS tube are connected with the MCU module, the inductor is grounded through an output capacitor and connected with one end of the first resistor, and the other end of the first resistor is respectively connected with the MCU module and grounded through the second resistor.
2. The synchronous buck circuit based on motor driver according to claim 1, wherein the voltage and current acquisition circuit further includes a third resistor and an operational amplifier, one end of the third resistor is connected to the inductor, and two ends of the third resistor are connected to the MCU module through the operational amplifier.
3. The synchronous buck motor driver-based circuit according to claim 1, wherein the other end of the third resistor is coupled to the output terminal.
4. The synchronous buck motor driver-based circuit according to claim 1, wherein the inductor is configured to convert the adjustable high voltage PWM pulse to a triangular wave pulse.
5. The motor driver based synchronous buck circuit according to claim 1, wherein the output capacitor is configured to filter the triangular wave pulses to form a direct current.
6. The synchronous buck motor driver-based circuit according to claim 1, wherein the voltage-current collection circuit is further configured to output a constant voltage and a constant current.
7. The motor driver based synchronous buck circuit according to claim 1, wherein the MCU module is further configured to adjust the duty cycle of the adjustable high voltage PWM pulses according to the output current and the output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321620786.8U CN220605772U (en) | 2023-06-25 | 2023-06-25 | Synchronous voltage reduction circuit based on motor driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321620786.8U CN220605772U (en) | 2023-06-25 | 2023-06-25 | Synchronous voltage reduction circuit based on motor driver |
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| CN220605772U true CN220605772U (en) | 2024-03-15 |
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| CN202321620786.8U Active CN220605772U (en) | 2023-06-25 | 2023-06-25 | Synchronous voltage reduction circuit based on motor driver |
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- 2023-06-25 CN CN202321620786.8U patent/CN220605772U/en active Active
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