Circuit for dynamically adjusting output voltage of direct current voltage stabilizer

Abstract

The invention discloses a circuit for dynamically adjusting the output voltage of a direct-current voltage stabilizer, which is characterized in that a microcontroller is connected with a digital-to-analog converter, the voltage output end of the digital-to-analog converter is connected with a voltage division circuit, and the voltage division circuit is connected in parallel with the output voltage end and the feedback voltage end of the direct-current voltage stabilizer; according to the voltage division circuit, the two ends of the first resistor are connected to the output voltage end and the feedback voltage end of the direct-current voltage stabilizer in parallel, the two ends of the second resistor are connected with the feedback voltage end of the direct-current voltage stabilizer and the ground, the capacitor is connected with the first resistor in parallel, and the end, not connected with the output voltage, of the capacitor is connected with the third resistor. The other end of the third resistor is connected with the voltage output end of the digital-to-analog converter; under the condition that the values of the feedback voltage, the first resistor, the second resistor and the third resistor are not changed, the output voltage of the direct-current voltage stabilizer changes along with the output voltage of the digital-to-analog converter. Therefore, the voltage output of the direct-current voltage stabilizer can be dynamically adjusted according to the preset curve only by programming the microcontroller and controlling the output voltage of the digital-to-analog converter.

Description

Technical Field

[0001] The invention belongs to the technical field of output voltage regulation, and in particular relates to a circuit for dynamically regulating the output voltage of a direct current voltage regulator. Background Art

[0002] During use, electronic devices may need to operate at different voltages for power saving or work efficiency considerations, lowering the voltage when saving power and increasing the voltage when processing large amounts of data.

[0003] The operating environment of electronic equipment is relatively complex, and it may face scenarios such as fast power-on, slow power-on, step power-on, and power supply oscillation. In order to verify the reliability of electronic equipment, it is necessary to simulate various abnormal power-on scenarios during the production test phase to test the reliability of electronic equipment. The power supply is required to dynamically adjust the voltage output of the power supply according to the required curve.

[0004] There are two ways to adjust the output voltage in existing DC voltage regulators. One is to adjust the output voltage through voltage divider resistor feedback ( Figure 1 ), this method can only set a fixed voltage during production, or manually adjust the output voltage through an adjustable potentiometer ( Figure 2 ); second, limited gear settings during operation ( Figure 3 ), arbitrary voltage regulation cannot be achieved.

[0005] These simple methods are unable to dynamically adjust the voltage output of the power supply according to the required curve. Summary of the invention

[0006] The object of the present invention is to provide a circuit for dynamically adjusting the output voltage of a DC voltage regulator, so as to achieve dynamic and smooth adjustment of the voltage output of the DC voltage regulator according to a required curve.

[0007] To solve the above problems, the technical solution of the present invention is: A circuit for dynamically adjusting the output voltage of a DC voltage regulator, comprising: a voltage dividing circuit, a control center with a digital-to-analog conversion output; The control center with digital-to-analog conversion output dynamically controls the voltage of the digital-to-analog conversion output according to a preset curve, and is further configured to generate a voltage schedule according to the preset curve; configure the digital-to-analog conversion channel and working mode to achieve continuous conversion; configure the data transmission method to transmit the data of the voltage schedule to the digital-to-analog conversion output; configure the timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output; The digital-to-analog conversion output terminal of the control center with digital-to-analog conversion output is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC regulator; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC regulator, two ends of the second resistor are respectively connected to the feedback voltage end of the DC regulator and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output end; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the voltage output by the digital-to-analog conversion.

[0008] According to one embodiment of the present invention, the control center with digital-to-analog conversion output includes a digital-to-analog converter and a controller. The controller is communicatively connected to the digital-to-analog converter and dynamically controls the output voltage of the digital-to-analog converter according to a preset curve. The voltage output end of the digital-to-analog converter is connected to the voltage divider circuit.

[0009] According to one embodiment of the present invention, the control center with digital-to-analog conversion output is a microcontroller with a built-in digital-to-analog conversion module, and the microcontroller is provided with a digital-to-analog conversion voltage output interface, and the digital-to-analog conversion voltage output interface is connected to the voltage divider circuit; the microcontroller is configured to set the DAC digital code according to a preset curve, and control the digital-to-analog conversion voltage output interface to output the corresponding voltage.

[0010] According to one embodiment of the present invention, when the control center with digital-to-analog conversion output is configured as a voltage output curve that slowly rises or falls during the power-on or power-off stage of the product, based on the voltage output curve, the voltage output of the digital-to-analog conversion at each moment is automatically calculated and output according to the voltage conversion formula, and a voltage timetable is generated to accurately control the output voltage of the DC regulator.

[0011] According to an embodiment of the present invention, the product is a power supply with a capacitor of 220uF or more in parallel, and the control center with digital-to-analog conversion output is further configured to control the digital-to-analog conversion output terminal to output a voltage at a frequency of 10kHz.

[0012] According to one embodiment of the present invention, when the control center with digital-to-analog conversion output is configured as a voltage output curve that oscillates during the power-on or power-off stage of the product, based on the voltage output curve, the voltages of each turning point of the voltage output curve are saved, the entire voltage output waveform is converted into multiple broken lines, and the voltage of the digital-to-analog conversion output of each broken line at each moment is automatically calculated and output according to the voltage conversion formula, and a voltage time table is generated to accurately control the output voltage of the DC regulator.

[0013] According to one embodiment of the present invention, the product is a connector, and the control center with digital-to-analog conversion output is further configured to control the digital-to-analog conversion output terminal to output voltage at a corresponding frequency according to the oscillation period of the voltage during the power-on or power-off stage of the connector.

[0014] A circuit for dynamically adjusting the output voltage of a DC to DC converter comprises: a voltage divider circuit, a control center with a digital-to-analog conversion output; The control center with digital-to-analog conversion output dynamically controls the voltage of the digital-to-analog conversion output according to a preset curve, and is further configured to generate a voltage schedule according to the preset curve; configure the digital-to-analog conversion channel and working mode to achieve continuous conversion; configure the data transmission method to transmit the data of the voltage schedule to the digital-to-analog conversion output; configure the timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output; The digital-to-analog conversion output terminal of the control center with digital-to-analog conversion output is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC-to-DC converter; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC-DC converter, two ends of the second resistor are respectively connected to the feedback voltage end of the DC-DC converter and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output end; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC-DC converter changes with the voltage output by the digital-to-analog conversion.

[0015] A circuit for dynamically adjusting the output voltage of a DC voltage regulator, comprising: a voltage dividing circuit, a digital-to-analog converter and a microcontroller; The microcontroller is connected to the digital-to-analog converter and dynamically controls the output voltage of the digital-to-analog converter according to a preset curve; The voltage output terminal of the digital-to-analog converter is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC regulator; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC regulator, two ends of the second resistor are respectively connected to the feedback voltage end of the DC regulator and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the voltage output end of the digital-to-analog converter; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the output voltage of the digital-to-analog converter.

[0016] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The circuit for dynamically adjusting the output voltage of a DC voltage regulator in one embodiment of the present invention connects the microcontroller to the digital-to-analog converter through a voltage divider circuit, a digital-to-analog converter and a microcontroller, the voltage output end of the digital-to-analog converter is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage end and the feedback voltage end of the DC voltage regulator; wherein the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, the two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC voltage regulator, the two ends of the second resistor are respectively connected to the feedback voltage end and the ground of the DC voltage regulator, the capacitor is connected in parallel to the first resistor, the end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the voltage output end of the digital-to-analog converter; when the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC voltage regulator changes with the output voltage of the digital-to-analog converter. Therefore, it is only necessary to program the microcontroller and control the output voltage of the digital-to-analog converter to realize the voltage output of the DC voltage regulator dynamically adjusted according to the preset curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an output voltage regulating circuit of a voltage-dividing resistor feedback DC voltage regulator; Figure 2 It is an output voltage regulating circuit of an adjustable potentiometer type DC voltage regulator; Figure 3 It is a configuration pin-regulated DC voltage regulator output voltage regulation circuit; Figure 4 is an internal structure diagram of a low voltage dropout linear regulator in one embodiment of the present invention; Figure 5 A circuit for dynamically adjusting the output voltage of a DC voltage regulator in one embodiment of the present invention; Figure 6 A regulating circuit of a microcontroller with a digital-to-analog conversion output interface in one embodiment of the present invention; Figure 7 is an application curve in one embodiment of the present invention; Figure 8 is another application curve in one embodiment of the present invention; Fig. 9 The invention is an output circuit regulating circuit for a DC / DC converter in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following is a further detailed description of a circuit for dynamically adjusting the output voltage of a DC voltage regulator proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0019] Embodiment 1 In view of the problem that the output voltage of the existing DC regulator cannot be dynamically adjusted according to the required curve, the present embodiment provides a circuit for dynamically adjusting the output voltage of the DC regulator, so that the output voltage of the DC regulator changes with the output voltage of the digital-to-analog converter, and uses a microcontroller to dynamically control the output voltage of the digital-to-analog converter according to a preset curve, thereby realizing dynamic adjustment of the voltage output of the DC regulator.

[0020] Adjustable DC regulators such as low dropout linear regulators (LDOs) and DC / DC converters (DCDCs) typically provide a feedback or regulation input that is used to set the desired output.

[0021] The following takes a low voltage dropout linear regulator as an example. Figure 4 The figure shows the internal structure of LDO. LDO consists of three parts: error amplifier AMP, reference voltage source VREF, and output adjustment tube VT. The adjustment tube works in linear mode. As a standard negative feedback loop, when the input or load changes and the output voltage VOUT begins to fluctuate, the error amplifier will continuously compare the feedback voltage VFB from the output voltage and the reference voltage VREF, and control the adjustment tube VT to make their difference zero, thereby keeping the output voltage VOUT constant. This is how voltage stabilization (voltage regulation) is achieved through feedback loop control. In the feedback loop, the voltage VFB at the in-phase pin of the error amplifier AMP always tries to be the same as the inverting pin VREF, so VFB=VREF.

[0022] As can be seen from the figure: I1 = I2, where: I1 is the current flowing through R1, I2 is the current flowing through R2, according to Ohm's law: (VOUT-VREF) / R1 = VREF / R2 That is: VOUT = [(R1+R2) / R2] × VREF Because VREF is fixed, the voltage of VOUT can be adjusted by adjusting the resistance values ​​of R1 and R2.

[0023] The circuit for dynamically adjusting the output voltage of a direct current regulator provided in this embodiment includes: a voltage divider circuit and a control center with a digital-to-analog conversion output; the control center with a digital-to-analog conversion output dynamically controls the voltage of the digital-to-analog conversion output according to a preset curve, and is further configured to generate a voltage timetable according to the preset curve; configures a digital-to-analog conversion channel and a working mode to achieve continuous conversion; configures a data transmission method so as to pass the data of the voltage timetable to the digital-to-analog conversion output; configures a timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output.

[0024] The digital-to-analog conversion output terminal of the control center with digital-to-analog conversion output is connected to a voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC voltage regulator. The voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, the two ends of the first resistor are connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC voltage regulator, the two ends of the second resistor are respectively connected to the feedback voltage terminal of the DC voltage regulator and the ground, the capacitor is connected in parallel to the first resistor, the end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output terminal.

[0025] When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the voltage output by the digital-to-analog conversion.

[0026] Specifically, the control center with digital-to-analog conversion output includes a digital-to-analog converter and a controller, the controller is connected to the digital-to-analog converter in communication, dynamically controls the output voltage of the digital-to-analog converter according to a preset curve, and the voltage output end of the digital-to-analog converter is connected to the voltage divider circuit. Figure 5 As shown, the microcontroller MCU1 is connected to the voltage-type digital-to-analog converter DAC1, and the output voltage of the voltage-type digital-to-analog converter DAC1 can be dynamically controlled according to a preset curve. The voltage output end of the voltage-type digital-to-analog converter DAC1 is connected to a voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage end and the feedback voltage end of the DC regulator LDO1.

[0027] Wherein, the voltage divider circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a capacitor C1, two ends of the first resistor R1 are connected in parallel to the output voltage terminal OUT and the feedback voltage terminal FB of the DC regulator LDO1, two ends of the second resistor R2 are respectively connected to the feedback voltage terminal FB of the DC regulator LDO1 and the ground, the capacitor C1 is connected in parallel with the first resistor R1, one end of the capacitor C1 not connected to the output voltage VOUT is connected to the third resistor R3, and the other end of the third resistor R3 is connected to the voltage output end of the voltage-type digital-to-analog converter DAC1.

[0028] When the feedback voltage VFB, the values ​​of the first resistor R1 , the second resistor R2 , and the third resistor R3 remain unchanged, the output voltage of the DC regulator LDO1 changes with the output voltage of the digital-to-analog converter DAC1 .

[0029] It can be seen from the figure that: I1 = I2 + I3, where: I1 is the current flowing through R1, I2 is the current flowing through R2, and I3 is the current flowing through R3. According to Ohm's law: (VOUT-VREF) / R1 = VREF / R2 + (VREF-VDAC) / R3 That is: VOUT = VREF + [VREF / R2 + (VREF-VDAC) / R3] * R1 When VREF, R1, R2, and R3 are fixed (appropriate resistance values ​​are selected according to the output voltage range requirements), VOUT will change linearly with the change of VDAC voltage. Therefore, it is only necessary to program the microcontroller MCU1 and control the output voltage VDAC of the digital-to-analog converter DAC1 to dynamically adjust the voltage output of the DC regulator LDO1.

[0030] Figure 5 In the figure, the voltage-type digital-to-analog converter DAC1 and the microcontroller MCU1 can also be replaced by an MCU with a DAC output. The MCU has a DAC conversion module inside. When the MCU sets the DAC digital code, the DAC_OUT pin will output the corresponding voltage. Figure 6 As shown. That is, the control center with digital-to-analog conversion output is a microcontroller with a built-in digital-to-analog conversion module, and the microcontroller is provided with a digital-to-analog conversion voltage output interface, and the digital-to-analog conversion voltage output interface is connected to a voltage divider circuit. The microcontroller is configured to generate a voltage schedule according to a preset curve, set a DAC digital code according to the voltage schedule, and control the digital-to-analog conversion voltage output interface to output a corresponding voltage.

[0031] The microcontroller MCU1 dynamically controls the output voltage of the digital-to-analog converter DAC1 according to a preset curve, further comprising: Generate voltage schedule according to preset curve; Configure DAC1 channel and working mode to achieve continuous conversion; Configure the data transmission method to pass the voltage schedule data to DAC1; Configure the timer to set the update rate of DAC1 and control the output frequency of DAC1.

[0032] The voltage time table generated according to the preset curve can be determined according to the specific application scenario. For example: Example 1: See Figure 7In order to make the power supply able to withstand large transient current shocks, a large capacitor is often connected in parallel to the power supply, such as a capacitor of 220uF or above. The power-on and power-off are slow and take several hundred milliseconds. MCU1 can control the output voltage of the digital-to-analog converter at a frequency of 10kHz. During the product development and testing phase, it is necessary to simulate the power-on and power-off curves for testing.

[0033] MCU1 automatically calculates the voltage VDAC of DAC1 at each time point according to the VOUT voltage curve in the power-on and power-off stages and the conversion formula between VDAC and VOUT: VOUT = VREF +[VREF / R2 + (VREF-VDAC) / R3] * R1, thereby generating a voltage time table to accurately control the output voltage waveform of the DC regulator.

[0034] Example 2: See Figure 8 During the power on and off process of some products, the contact problem of the connector causes power oscillation, and it is necessary to simulate the power on and off waveform for testing. For example, when a USB device is plugged in, its jitter cycle is between tens of milliseconds and hundreds of milliseconds. It is necessary to simulate the power on and off waveform for testing. During the test, the output voltage can be controlled at a frequency of 10K.

[0035] According to the oscillation waveform requirements of the power-on and power-off stages, MCU1 saves the voltage VOUT at each turning point, converts the entire waveform into multiple broken lines, and then uses the VDAC and VOUT conversion formula: VOUT = VREF + [VREF / R2 + (VREF-VDAC) / R3] * R1 to automatically calculate and output the DAC voltage VDAC at each time point of each broken line, thereby generating a voltage time table to accurately control the output voltage waveform of the DC regulator.

[0036] Configure DAC1 channel and working mode to achieve continuous conversion. DAC1 of this embodiment can be a 12-bit voltage output type digital-to-analog converter, which can be configured as 8-bit or 12-bit mode. When DAC1 works in 12-bit mode, the data can be left-aligned or right-aligned. When working in 8-bit mode, the data can only be right-aligned. DAC1 can have two output channels, each channel has a converter, and each channel can be converted separately. Here, DAC1 can be configured to work in 12-bit mode, single channel, continuous conversion mode.

[0037] Configure the data transfer method to pass the voltage time table data to DAC1. The data transfer method here refers to the data transfer between the microcontroller and the digital-to-analog converter, which can be achieved through data transfer methods such as DMA, SPI, I2C or UART. If DMA transfer method is used, you can select the loop mode to ensure that DMA continues to the next transfer after completing one data transfer, and enable the address increment function to ensure that DMA updates the address after each transfer to avoid data overwriting. Configure the timer to set the update rate of DAC1 and control the output frequency of DAC1. Set the timer according to the system clock of the microcontroller and set the timer period. By triggering the update of DAC1 through the timer, DAC1 will continuously output the received voltage data. By adjusting the frequency of the timer, the update frequency of DAC1 can be changed, thereby controlling the output frequency of the voltage data and further controlling the output voltage waveform of the DC regulator.

[0038] In summary, the circuit for dynamically adjusting the output voltage of the DC regulator provided in this embodiment only needs to program the microcontroller and control the output voltage of the digital-to-analog converter to dynamically adjust the voltage output of the DC regulator according to a preset curve. It can be applied to various voltage output waveforms and is very convenient.

[0039] Embodiment 2 The circuit principle in the first embodiment is also applicable to the DC / DC converter. This embodiment provides a circuit for dynamically adjusting the output voltage of the DC / DC converter, including: a voltage divider circuit, a control center with a digital-to-analog conversion output; a control center with a digital-to-analog conversion output, dynamically controlling the voltage of the digital-to-analog conversion output according to a preset curve, and further configured to generate a voltage schedule according to the preset curve; configuring the digital-to-analog conversion channel and working mode to achieve continuous conversion; configuring the data transmission method so that the data of the voltage schedule is passed to the digital-to-analog conversion output; configuring a timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output.

[0040] The digital-to-analog conversion output end of the control center with digital-to-analog conversion output is connected to a voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage end and the feedback voltage end of the DC-DC converter; wherein the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC-DC converter, two ends of the second resistor are respectively connected to the feedback voltage end of the DC-DC converter and the ground, the capacitor is connected in parallel to the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output end; when the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC-DC converter changes with the voltage output by the digital-to-analog conversion.

[0041] Specifically, the control center with digital-to-analog conversion output includes a digital-to-analog converter and a controller, the controller is connected to the digital-to-analog converter in communication, dynamically controls the output voltage of the digital-to-analog converter according to a preset curve, and the voltage output end of the digital-to-analog converter is connected to the voltage divider circuit. Fig. 9 As shown, the microcontroller MCU1 is connected to the voltage-type digital-to-analog converter DAC1, and the output voltage of the voltage-type digital-to-analog converter DAC1 can be dynamically controlled according to a preset curve. The voltage output terminal of the voltage-type digital-to-analog converter DAC1 is connected to a voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC-DC converter DCDC1.

[0042] Wherein, the voltage divider circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a capacitor C1, two ends of the first resistor R1 are connected in parallel to the output voltage terminal OUT and the feedback voltage terminal FB of the DC-DC converter DCDC1, two ends of the second resistor R2 are respectively connected to the feedback voltage terminal FB of the DC-DC converter DCDC1 and the ground, the capacitor C1 is connected in parallel to the first resistor R1, one end of the capacitor C1 not connected to the output voltage VOUT is connected to the third resistor R3, and the other end of the third resistor R3 is connected to the voltage output terminal of the voltage-type digital-to-analog converter DAC1.

[0043] When the feedback voltage VFB, the values ​​of the first resistor R1 , the second resistor R2 and the third resistor R3 remain unchanged, the output voltage of the DC-DC converter DCDC1 changes with the output voltage of the digital-to-analog converter DAC1 .

[0044] The pinout and external wiring of a DC-DC converter are similar to those of a DC linear regulator, except that the output voltage is controlled internally through PWM pulse width modulation.

[0045] The function and implementation of the circuit for dynamically adjusting the output voltage of the DC-DC converter are similar to those of the first embodiment, and will not be described in detail herein.

[0046] Embodiment 3 The present embodiment provides a circuit for dynamically adjusting the output voltage of a DC regulator, including: a voltage divider circuit, a digital-to-analog converter and a microcontroller; the microcontroller is connected to the digital-to-analog converter and dynamically controls the output voltage of the digital-to-analog converter according to a preset curve; the voltage output end of the digital-to-analog converter is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage end and feedback voltage end of the DC regulator.

[0047] Among them, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, the two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC regulator, the two ends of the second resistor are respectively connected to the feedback voltage end of the DC regulator and the ground, the capacitor is connected in parallel with the first resistor, the end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the voltage output end of the digital-to-analog converter; when the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the output voltage of the digital-to-analog converter.

[0048] Please see Figure 5 The microcontroller MCU1 is connected to the voltage-type digital-to-analog converter DAC1, and can dynamically control the output voltage of the voltage-type digital-to-analog converter DAC1 according to a preset curve. The voltage output end of the voltage-type digital-to-analog converter DAC1 is connected to a voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage end and the feedback voltage end of the DC regulator LDO1.

[0049] Wherein, the voltage divider circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a capacitor C1, two ends of the first resistor R1 are connected in parallel to the output voltage terminal OUT and the feedback voltage terminal FB of the DC regulator LDO1, two ends of the second resistor R2 are respectively connected to the feedback voltage terminal FB of the DC regulator LDO1 and the ground, the capacitor C1 is connected in parallel with the first resistor R1, one end of the capacitor C1 not connected to the output voltage VOUT is connected to the third resistor R3, and the other end of the third resistor R3 is connected to the voltage output end of the voltage-type digital-to-analog converter DAC1.

[0050] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A circuit for dynamically adjusting the output voltage of a DC regulator, characterized in that: include: Voltage divider circuit, control center with digital-to-analog conversion output; The control center with digital-to-analog conversion output dynamically controls the voltage of the digital-to-analog conversion output according to a preset curve, and is further configured to generate a voltage schedule according to the preset curve; configure the digital-to-analog conversion channel and working mode to achieve continuous conversion; configure the data transmission method to transmit the data of the voltage schedule to the digital-to-analog conversion output; configure the timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output; The digital-to-analog conversion output terminal of the control center with digital-to-analog conversion output is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC regulator; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC regulator, two ends of the second resistor are respectively connected to the feedback voltage end of the DC regulator and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output end; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the voltage output by the digital-to-analog conversion.

2. The circuit for dynamically adjusting the output voltage of a DC regulator according to claim 1, characterized in that: The control center with digital-to-analog conversion output includes a digital-to-analog converter and a controller. The controller is communicatively connected to the digital-to-analog converter and dynamically controls the output voltage of the digital-to-analog converter according to a preset curve. The voltage output end of the digital-to-analog converter is connected to the voltage divider circuit.

3. The circuit for dynamically adjusting the output voltage of a DC regulator according to claim 1, characterized in that: The control center with digital-to-analog conversion output is a microcontroller with a built-in digital-to-analog conversion module. The microcontroller is provided with a digital-to-analog conversion voltage output interface, and the digital-to-analog conversion voltage output interface is connected to the voltage divider circuit; the microcontroller is configured to set the DAC digital code according to a preset curve, and control the digital-to-analog conversion voltage output interface to output the corresponding voltage.

4. The circuit for dynamically adjusting the output voltage of a DC regulator according to claim 1, characterized in that: When the control center with digital-to-analog conversion output is configured as a voltage output curve that slowly rises or falls during the power-on or power-off stage of the product, based on the voltage output curve, the voltage output of the digital-to-analog conversion at each moment is automatically calculated and output according to the voltage conversion formula, and a voltage timetable is generated to accurately control the output voltage of the DC regulator.

5. The circuit for dynamically adjusting the output voltage of a DC regulator as claimed in claim 4, characterized in that: The product is a power supply with a capacitor of 220uF or more in parallel, and the control center with digital-to-analog conversion output is further configured to control the digital-to-analog conversion output terminal to output voltage at a frequency of 10kHz.

6. The circuit for dynamically adjusting the output voltage of a DC regulator according to claim 1, characterized in that: When the control center with digital-to-analog conversion output is configured as a voltage output curve that oscillates during the power-on or power-off stage of the product, based on the voltage output curve, the voltages of each turning point of the voltage output curve are saved, the entire voltage output waveform is converted into multiple broken lines, and the voltage of the digital-to-analog conversion output at each broken line at each moment is automatically calculated and output according to the voltage conversion formula, and a voltage time table is generated to accurately control the output voltage of the DC regulator.

7. The circuit for dynamically adjusting the output voltage of a DC regulator as claimed in claim 6, characterized in that: The product is a connector, and the control center with digital-to-analog conversion output is further configured to control the digital-to-analog conversion output terminal to output voltage at a corresponding frequency according to the oscillation period of the voltage during the power-on or power-off stage of the connector.

8. A circuit for dynamically adjusting the output voltage of a DC-DC converter, characterized in that: include: Voltage divider circuit, control center with digital-to-analog conversion output; The control center with digital-to-analog conversion output dynamically controls the voltage of the digital-to-analog conversion output according to a preset curve, and is further configured to generate a voltage schedule according to the preset curve; configure the digital-to-analog conversion channel and working mode to achieve continuous conversion; configure the data transmission method to transmit the data of the voltage schedule to the digital-to-analog conversion output; configure the timer to set the update rate of the digital-to-analog conversion and control the frequency of the digital-to-analog conversion output; The digital-to-analog conversion output terminal of the control center with digital-to-analog conversion output is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC-to-DC converter; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC-DC converter, two ends of the second resistor are respectively connected to the feedback voltage end of the DC-DC converter and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the digital-to-analog conversion output end; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC-DC converter changes with the voltage output by the digital-to-analog conversion.

9. A circuit for dynamically adjusting the output voltage of a DC regulator, characterized in that: include: Voltage divider circuit, digital-to-analog converter and microcontroller; The microcontroller is connected to the digital-to-analog converter and dynamically controls the output voltage of the digital-to-analog converter according to a preset curve; The voltage output terminal of the digital-to-analog converter is connected to the voltage divider circuit, and the voltage divider circuit is connected in parallel to the output voltage terminal and the feedback voltage terminal of the DC regulator; Wherein, the voltage divider circuit includes a first resistor, a second resistor, a third resistor and a capacitor, two ends of the first resistor are connected in parallel to the output voltage end and the feedback voltage end of the DC regulator, two ends of the second resistor are respectively connected to the feedback voltage end of the DC regulator and the ground, the capacitor is connected in parallel with the first resistor, one end of the capacitor not connected to the output voltage is connected to the third resistor, and the other end of the third resistor is connected to the voltage output end of the digital-to-analog converter; When the values ​​of the feedback voltage, the first resistor, the second resistor and the third resistor remain unchanged, the output voltage of the DC regulator changes with the output voltage of the digital-to-analog converter.

Images