CN220626933U - Output voltage circuit with PWM feedback regulation - Google Patents
Output voltage circuit with PWM feedback regulation Download PDFInfo
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Abstract
The application discloses take output voltage circuit of PWM feedback regulation, the circuit includes processing chip, PWM modulation unit, feedback unit, input filter unit, enabling unit, rectifying element and output filter unit, wherein: the PWM modulation unit is used for receiving PWM pulse signal input and level signal input, the processing chip is used for adjusting the magnitude of the output voltage of the external inductance pin of the processing chip according to the level signal output by the feedback unit, the input filtering unit is used for receiving the level signal output by the power supply signal, the enabling unit is used for outputting the level signal output by the power supply signal to the enabling pin of the processing chip, the rectifying unit is used for receiving the level signal output by the external inductance pin of the processing chip, and the output filtering unit is used for receiving the level signal output by the rectifying unit. The circuit has the beneficial effects of reducing the layout area required by the output voltage circuit, and reducing the technical cost required by realizing the real-time adjustment of the power supply voltage of the circuit.
Description
Technical Field
The present disclosure relates to output voltage circuits, and more particularly to an output voltage circuit with PWM feedback regulation.
Background
At present, the power supply circuit of the power chip rapidly develops towards a more stable direction of the output voltage signal, the output voltage value of a PMIC (Power Management IC, centralized manageable power supply) regulating circuit is generally adopted in the industry, the PMIC is usually required to be added with a large-size communication controller at two ends of a device, and the dynamic regulation of the voltage is realized in a communication mode, however, the design of the output voltage circuit increases the area required by the layout and also increases the technical cost. Therefore, how to reduce the layout area required by the output voltage circuit, thereby reducing the technical cost is a technical problem to be solved.
Disclosure of Invention
The purpose of the present application is to reduce the layout area required by an output voltage circuit, thereby reducing the technical cost required to realize the real-time adjustment of the supply voltage of the circuit.
The technical aim of the application is achieved through the following technical scheme:
an output voltage circuit with PWM feedback regulation, the circuit comprises a first processing chip, a PWM modulation unit, a feedback unit, an input filtering unit, an enabling unit, a rectifying unit and an output filtering unit, wherein:
the PWM unit comprises a PWM input end, a level input end and an output end, wherein the PWM input end of the PWM unit is connected with a PWM pulse signal source, the level input end of the PWM unit is connected with a direct current power supply signal, the output end of the PWM unit is connected with the feedback unit, the PWM unit is used for receiving PWM pulse signal input and level signal input, and the PWM pulse signal and the level signal are modulated by the PWM unit and then output to the feedback unit to serve as feedback voltage;
the feedback unit comprises an input end, an output end and a grounding end, wherein the input end of the feedback unit is connected with the output end of the rectifying unit, the output end of the feedback unit is connected with the feedback pin of the first processing chip, the grounding end of the feedback unit is connected with a grounding electrode, the feedback unit is used for receiving the level signal output by the rectifying unit and outputting the level signal to the feedback pin of the first processing chip according to the feedback voltage, and the first processing chip is used for adjusting the output voltage of the external inductance pin of the first processing chip according to the level signal output by the feedback unit;
the input filtering unit comprises an input end and an output end, the input end of the input filtering unit is connected with an external power supply signal, the output end of the input filtering unit is connected with an input voltage pin of the first processing chip, the input filtering unit is used for receiving a level signal output by the power supply signal, and the level signal is filtered by the input filtering unit and then is output to the input voltage pin of the first processing chip;
the enabling unit comprises an input end and an output end, the input end of the enabling unit is connected with the power supply signal, the output end of the enabling unit is connected with the enabling pin of the first processing chip, and the enabling unit is used for outputting a level signal output by the power supply signal to the enabling pin of the first processing chip;
the rectifying unit comprises an input end and an output end, the input end of the rectifying unit is connected with the external inductance pin of the first processing chip, the output end of the rectifying unit is connected with the output filtering unit, the rectifying unit is used for receiving a level signal output by the external inductance pin of the first processing chip, and the level signal is output to the output filtering unit after being rectified;
the output filter unit comprises an input end and an output end, the input end of the output filter unit is connected with the output end of the rectification unit, the output end of the output filter unit is connected with the power supply pin of the power utilization chip, the output filter unit is used for receiving the level signal output by the rectification unit, and the level signal output by the rectification unit is output to the power supply pin of the power utilization chip after being filtered by the output filter unit.
By adopting the technical scheme, the power supply circuit can adjust the power supply voltage in real time, and the power supply stability is ensured.
Optionally, the PWM modulating unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor, wherein:
a first end of the first resistor is connected with the PWM pulse signal source, and a second end of the first resistor is connected with the direct current power supply signal;
the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the first end of the first capacitor, the second end of the first capacitor is grounded, the first end of the first capacitor is also connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the feedback unit.
By adopting the technical scheme, the reference current is changed by PWM to adjust the duty ratio, so that the feedback voltage of the feedback circuit is changed, and the real-time adjustment of the power supply voltage is realized.
Optionally, the feedback unit includes a second capacitor, a fifth resistor, a sixth resistor, and a seventh resistor, wherein:
the first end of the second capacitor is respectively connected with the second end of the fifth resistor and the first end of the sixth resistor, the second capacitor is respectively connected with the second end of the fourth resistor and the first end of the seventh resistor, and the second end of the seventh resistor is grounded;
the first end of the fifth resistor is connected with the output end of the rectifying unit.
By adopting the technical scheme, the output voltage is subjected to feedback regulation, the output voltage is compared with the feedback voltage and then is output to the first processing chip, and the first processing chip regulates the output voltage according to the comparison result.
Optionally, the input filtering unit includes a third capacitor, a first end of the third capacitor is connected to the external power signal, and a second end of the third capacitor is grounded.
By adopting the technical scheme, the input level signal is filtered, so that signal interference is reduced.
Optionally, the enabling unit includes an eighth resistor and a fourth capacitor, wherein:
the first end of the eighth resistor is connected with the external power supply signal, the second end of the eighth resistor is respectively connected with the first end of the fourth capacitor and the enabling pin of the first processing chip, and the second end of the fourth capacitor is grounded.
By adopting the technical scheme, the driving voltage is provided for the first processing chip.
Optionally, the rectifying unit includes a first inductor, a first end of the first inductor is connected to an external inductor pin of the first processing chip, and a second end of the first inductor is connected to a first end of the fifth resistor and an input end of the filtering unit respectively.
By adopting the technical scheme, the output voltage of the first processing chip is rectified, and signal interference is reduced.
Optionally, the output filtering unit includes a fifth capacitor, a sixth capacitor, and a seventh capacitor, wherein:
a first end of the fifth capacitor is connected with a first end of the fifth resistor, and a second end of the fifth capacitor is grounded; the first end of the sixth capacitor is connected with the first end of the fifth capacitor, and the second end of the sixth capacitor is grounded;
the first end of the seventh capacitor is respectively connected with the first end of the sixth capacitor and the power supply pin of the power utilization chip, and the second end of the seventh capacitor is grounded.
By adopting the technical scheme, the output voltage is filtered and then output to the power supply pin of the power utilization chip.
Optionally, the circuit further includes a compensation unit, where the compensation unit is configured to receive the output dc voltage value of the output filter unit, the compensation unit includes an input end and an output end, the input end of the compensation unit is connected to the first end of the fifth capacitor, and the output end of the compensation unit is connected to the second end of the fifth resistor.
By adopting the technical scheme, the problem that the output voltage is insufficient due to inaccurate feedback voltage detection caused by long distance between load power supply and a feedback circuit is avoided.
In summary, the present application at least includes one of the following beneficial effects:
1. when the output voltage is supplied to the power utilization chip, the power utilization chip continuously detects voltage fluctuation when consuming electric energy, when the voltage is lower or higher, the duty ratio is adjusted through PWM signal input, the modulation circuit receives different PWM waveforms, and the reference current is changed, so that the feedback voltage is changed, the feedback circuit receives the feedback voltage and then adjusts the output voltage down and up, so that the power supply voltage is adjusted in real time, the power supply stability is ensured, and the power supply efficiency is improved.
2. When the output voltage is higher, the processing chip receives the voltage and then controls the rectifier inside the processing chip to reduce the output voltage, otherwise, when the output voltage is lower, the processing chip receives the voltage and then controls the rectifier to increase the output voltage, thereby realizing the adjustment of the output voltage.
3. The output voltage is processed by a plurality of integer filter units, so that the interference and fluctuation of signals can be obviously reduced, the smooth output of the signals is realized, and the reliability of the signals is improved.
Drawings
FIG. 1 is a block diagram of an output voltage circuit with PWM feedback regulation according to an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of an output voltage circuit with PWM feedback regulation connected in close proximity in accordance with an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a remotely connected output voltage circuit with PWM feedback regulation in accordance with an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a unit connection diagram of an output voltage circuit with PWM feedback regulation according to an embodiment of the present application includes a first processing chip, a PWM modulation unit (1), a feedback unit (2), an input filtering unit (3), an enabling unit (4), a rectifying unit (5), and an output filtering unit (6), where:
the PWM modulation unit (1) comprises a PWM input end, a level input end and an output end, wherein the PWM input end of the PWM modulation unit (1) is connected with a PWM pulse signal source, the level input end of the PWM modulation unit (1) is connected with a direct current power supply signal, the output end of the PWM modulation unit (1) is connected with the feedback unit (2), the PWM modulation unit (1) is used for receiving PWM pulse signal input and level signal input, and the PWM pulse signal and the level signal are modulated by the PWM modulation unit (1) and then output to the feedback unit (2) to serve as feedback voltage.
Regarding the PWM modulating unit (1): the PWM modulation unit (1) comprises a pair of pull-up and pull-down resistors and a set of shaping filter components, wherein the pull-up and pull-down resistors play a role in voltage division, the PWM modulation unit comprises two resistors, one resistor is connected with an external level signal, the other resistor is grounded, the circuit can be set at an intermediate potential through combination of the pull-up and pull-down resistors, and the shaping filter components comprise a capacitor and two resistors, the capacitor plays a role in filtering, and the capacitor can shape received PWM square waves into stable feedback voltages together with the two resistors. In the process, the height of the feedback voltage can be adjusted by adjusting the duty ratio of the PWM, so that the height of the output voltage is adjusted, and the dynamic adjustment of the output voltage is realized.
The feedback unit (2) comprises an input end, an output end and a grounding end, the input end of the feedback unit (2) is connected with the output end of the rectifying unit (5), the output end of the feedback unit (2) is connected with a feedback pin of the first processing chip, the grounding end of the feedback unit (2) is connected with a grounding electrode, the feedback unit (2) is used for receiving a level signal output by the rectifying unit (5), the level signal is output to a feedback pin of the first processing chip according to a feedback voltage, and the first processing chip is used for adjusting the magnitude of an output voltage of an external inductance pin of the first processing chip according to the level signal output by the feedback unit (2).
Regarding the feedback unit (2): the feedback unit (2) comprises three resistors and a capacitor, the voltage output by the external inductance pin (LX) of the first processing chip through the rectifying unit (5) is sensed through combined shaping filtering of the capacitor and the three resistors, when the voltage value exceeds a preset feedback voltage, the feedback pin (FB) of the first processing chip can sense the voltage, and the first processing chip can correspondingly adjust the output voltage according to the signal size of the feedback pin (FB) based on the reference voltage value, so that the stability of an electric signal is maintained.
The input filter unit (3) comprises an input end and an output end, the input end of the input filter unit (3) is connected with an external power supply signal, the output end of the input filter unit (3) is connected with the input voltage foot of the first processing chip, the input filter unit (3) is used for receiving a level signal output by the power supply signal, and the level signal is output to the input voltage foot of the first processing chip after being filtered by the input filter unit (3).
Regarding the input filtering unit (3): the input filter unit (3) comprises a capacitor, one end of the capacitor is connected with the input level signal, the other end of the capacitor is grounded, interference and fluctuation in the level signal can be filtered, and the level signal can be smoothly output to the circuit.
The enabling unit (4) comprises an input end and an output end, the input end of the enabling unit (4) is connected with the power supply signal, the output end of the enabling unit (4) is connected with the enabling pin of the first processing chip, and the enabling unit (4) is used for outputting a level signal output by the power supply signal to the enabling pin of the first processing chip.
Regarding the enabling unit (4): the enabling unit (4) comprises a resistor, one end of the resistor receives the level signal filtered by the input filtering unit (3), the other end of the resistor is connected with an enabling pin (EN) of the first processing chip, and the enabling pin (EN) can drive the first processing chip to work after receiving the level signal.
More specifically, the enabling unit (4) can further comprise a capacitor, and the time for starting the first processing chip can be delayed through a delay circuit formed by the resistor and the capacitor, so that the effect of controlling the power-on time of the circuit is achieved. The larger the value of the capacitor C2, the longer the delay time, the smaller the value of the resistor R1, and the shorter the delay time.
The rectifying unit (5) comprises an input end and an output end, the input end of the rectifying unit (5) is connected with the external inductance pin of the first processing chip, the output end of the rectifying unit (5) is connected with the output filtering unit (6), the rectifying unit (5) is used for receiving a level signal output by the external inductance pin of the first processing chip, and the level signal is output to the output filtering unit (6) after rectifying.
Regarding the rectifying unit (5): the rectifying unit (5) comprises an inductor which has the characteristic of direct current resistance and alternating current and can rectify the level signal output by the first processing chip and filter signal interference.
The output filter unit (6) comprises an input end and an output end, the input end of the output filter unit (6) is connected with the output end of the rectification unit (5), the output end of the output filter unit (6) is connected with an electricity chip power supply pin, the output filter unit (6) is used for receiving level signals output by the rectification unit (5), and the level signals output by the rectification unit (5) are output to the electricity chip power supply pin after being subjected to filtering treatment of the output filter unit (6).
Regarding the output filter unit (6): the output filter unit (6) comprises a plurality of capacitors, one ends of the capacitors are connected with the level signals output by the rectifying unit (5), the other ends of the capacitors are grounded, the level signals output to the load are filtered, and interference and fluctuation of the level signals are reduced, so that the level signals are smoothly output to the load.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of an output voltage circuit with PWM feedback regulation according to an embodiment of the present application, where the circuit includes a first processing chip, a PWM modulation unit (1), a feedback unit (2), an input filtering unit (3), an enabling unit (4), a rectifying unit (5), and an output filtering unit (6), and the PWM modulation unit (1) includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor, and specifically includes:
a first end of the first resistor is connected with the PWM pulse signal source, and a second end of the first resistor is connected with the direct current power supply signal;
the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the first end of the first capacitor, the second end of the first capacitor is grounded, the first end of the first capacitor is also connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the feedback unit (2).
Specifically, the first resistor and the third resistor are pull-up resistors and play a role in voltage division, the second end of the first resistor is connected with a level signal, in the embodiment, the voltage of the end point A can be set in a state of middle voltage through combination of the pull-up resistors and the pull-down resistors, the first capacitor has a filtering effect, the second resistor and the fourth resistor are combined to form stable feedback voltage for shaping PWM square waves, the level of the feedback voltage can be adjusted through adjusting the duty ratio of PWM square wave input, and accordingly the level of the output voltage is adjusted, and dynamic adjustment is achieved.
More specifically, the duty ratio of the PWM square wave when no adjustment is performed is 100%, the reference voltage at the terminal B is 0.605V under the action of the voltage dividing resistor, and the voltage at the terminal C is 0.818V; when the PWM is turned on and adjusted, if the PWM frequency is 200K, the duty ratio is adjusted to 98%, the PWM square wave is filtered by the second resistor, the fourth resistor and the first capacitor, and then the voltage is superimposed on the terminal B, the voltage at the terminal B is increased to 0.645V, and the feedback voltage detected by the feedback pin (FB) of the first processing chip is increased, and then the output voltage is decreased, in this case, the voltage at the output terminal C is 0.73V.
Further, the feedback unit (2) comprises a second capacitor, a fifth resistor, a sixth resistor and a seventh resistor, wherein:
the first end of the second capacitor is respectively connected with the second end of the fifth resistor and the first end of the sixth resistor, the second capacitor is respectively connected with the second end of the fourth resistor and the first end of the seventh resistor, and the second end of the seventh resistor is grounded;
the first end of the fifth resistor is connected with the output end of the rectifying unit (5).
Specifically, a reference voltage and a rectifier are arranged in the first processing chip, the voltage output by a power supply external inductance pin (LX) of the first processing chip is divided by a fifth resistor and a sixth resistor, if the voltage output by the power supply external inductance pin LX of the first processing chip is higher, the voltage output to a feedback pin (FB) of the first processing chip after being divided by the fifth resistor and the sixth resistor is larger than the reference voltage, and then the rectifier in the first processing chip is controlled to reduce the output voltage of the power supply external inductance pin (LX); if the voltage output by the power supply external inductance pin (LX) of the chip (U1) is lower, the voltage output to the feedback pin (FB) of the first processing chip after being divided by the fifth resistor and the sixth resistor is smaller than the reference voltage, the rectifier in the control chip (U1) improves the output voltage of the power supply external inductance pin (LX) so as to maintain the stability of signal output.
Further, the input filter unit (3) comprises a third capacitor, a first end of the third capacitor is connected with the external power supply signal, and a second end of the third capacitor is grounded.
Specifically, the capacitor has a characteristic of passing an ac-dc resistance, and is connected to an external power supply signal through one end of the capacitor, and the other end is grounded, so that the capacitor can be filtered, and in this embodiment, the power supply signal outputs a dc voltage of 5V.
Further, the enabling unit (4) comprises an eighth resistor and a fourth capacitor, wherein:
the first end of the eighth resistor is connected with the external power supply signal, the second end of the eighth resistor is respectively connected with the first end of the fourth capacitor and the enabling pin of the first processing chip, and the second end of the fourth capacitor is grounded.
Specifically, one end of the eighth resistor receives the level signal filtered by the third capacitor, and outputs the level signal to the enabling pin of the first processing chip.
More specifically, the circuit can further comprise a fourth capacitor, the delay circuit formed by the eighth resistor and the fourth capacitor can delay the starting time of the first signal processing chip and slowly increase the voltage to the starting voltage threshold of the first signal processing chip, so that the effect of controlling the power-on time of the circuit is achieved. In this embodiment, the voltage threshold of the enable pin (EN) of the first processing chip is 1.5V, the larger the value of the fourth capacitor is, the longer the delay time is, the smaller the value of the eighth resistor is, and the shorter the delay time is.
Further, the rectifying unit (5) comprises a first inductor, a first end of the first inductor is connected with an external inductor pin of the first processing chip, and a second end of the first inductor is respectively connected with a first end of the fifth resistor and an input end of the filtering unit.
Specifically, the first inductor receives a dc voltage output from an external inductor pin (LX) of the first processing chip, and rectifies the dc voltage.
Further, the output filter unit (6) comprises a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein:
a first end of the fifth capacitor is connected with a first end of the fifth resistor, and a second end of the fifth capacitor is grounded; the first end of the sixth capacitor is connected with the first end of the fifth capacitor, and the second end of the sixth capacitor is grounded;
the first end of the seventh capacitor is respectively connected with the first end of the sixth capacitor and the power supply pin of the power utilization chip, and the second end of the seventh capacitor is grounded.
Specifically, the fifth capacitor, the sixth capacitor and the seventh capacitor can filter the level signal rectified by the first inductor, so that interference and fluctuation of the signal are reduced, and the level signal is smoothly output to a load.
Further, the power output needs to pass a distance, if the distance is too long, the loss of the transmission is larger, the larger the distance is, the larger the loss is, and in some possible embodiments, the longer the distance may exist for the power output to the load power supply, in order to avoid that the loss is too large and the output voltage value of the load end is lower, referring to fig. 3, in some possible embodiments, the circuit further includes a compensation unit (7), the compensation unit (7) is used for the feedback unit (2) to receive the output dc voltage value of the output filter unit (6), the compensation unit (7) includes an input end and an output end, the input end of the compensation unit (7) is connected to the first end of the fifth capacitor, and the output end of the compensation unit (7) is connected to the second end of the fifth resistor.
Specifically, the load may be a CPU, and when the first processing chip is closer to the load, the line loss between the terminal a and the terminal B in fig. 3 is smaller, so that the voltage of the terminal a and the voltage of the terminal B may be regarded as equal, and the compensation unit (7) is not required to be added in the circuit as a safe compensation mode.
More specifically, when the first processing chip is far from the load, the distance may be hundreds of meters, and at this time, the line loss between the terminal a and the terminal B is large, and cannot be ignored, so that the voltage of the terminal B is significantly smaller than the voltage value of the terminal a, in this case, if the output voltage is adjusted according to the voltage of the terminal a, there is a situation that the voltage value actually output to the load is insufficient, so by adding the compensation unit (7), the terminal B is connected to the terminal C, and the voltage value of the terminal C is detected, thereby obtaining the actual output voltage value more accurately, and avoiding the situation that the output voltage is too small.
The embodiments of the present utility model are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. The output voltage circuit with PWM feedback regulation is characterized by comprising a first processing chip, a PWM modulation unit (1), a feedback unit (2), an input filtering unit (3), an enabling unit (4), a rectifying unit (5) and an output filtering unit (6), wherein:
the PWM modulation unit (1) comprises a PWM input end, a level input end and an output end, wherein the PWM input end of the PWM modulation unit (1) is connected with a PWM pulse signal source, the level input end of the PWM modulation unit (1) is connected with a direct current power supply signal, the output end of the PWM modulation unit (1) is connected with the feedback unit (2), the PWM modulation unit (1) is used for receiving PWM pulse signal input and level signal input, and the PWM pulse signal and the level signal are modulated by the PWM modulation unit (1) and then output to the feedback unit (2) to serve as feedback voltage;
the feedback unit (2) comprises an input end, an output end and a grounding end, wherein the input end of the feedback unit (2) is connected with the output end of the rectifying unit (5), the output end of the feedback unit (2) is connected with a feedback pin of the first processing chip, the grounding end of the feedback unit (2) is connected with a grounding electrode, the feedback unit (2) is used for receiving a level signal output by the rectifying unit (5), the level signal is output to a feedback pin of the first processing chip according to the feedback voltage, and the first processing chip is used for adjusting the output voltage of an external inductance pin of the first processing chip according to the level signal output by the feedback unit (2);
the input filter unit (3) comprises an input end and an output end, the input end of the input filter unit (3) is connected with an external power supply signal, the output end of the input filter unit (3) is connected with an input voltage foot of the first processing chip, the input filter unit (3) is used for receiving a level signal output by the power supply signal, and the level signal is output to the input voltage foot of the first processing chip after being filtered by the input filter unit (3);
the enabling unit (4) comprises an input end and an output end, the input end of the enabling unit (4) is connected with the power supply signal, the output end of the enabling unit (4) is connected with an enabling pin of the first processing chip, and the enabling unit (4) is used for outputting a level signal output by the power supply signal to the enabling pin of the first processing chip;
the rectifying unit (5) comprises an input end and an output end, the input end of the rectifying unit (5) is connected with an external inductance pin of the first processing chip, the output end of the rectifying unit (5) is connected with the output filtering unit (6), the rectifying unit (5) is used for receiving a level signal output by the external inductance pin of the first processing chip, and the level signal is output to the output filtering unit (6) after rectifying;
the output filter unit (6) comprises an input end and an output end, the input end of the output filter unit (6) is connected with the output end of the rectification unit (5), the output end of the output filter unit (6) is connected with an electricity chip power supply pin, the output filter unit (6) is used for receiving level signals output by the rectification unit (5), and the level signals output by the rectification unit (5) are output to the electricity chip power supply pin after being subjected to filtering treatment of the output filter unit (6).
2. The output voltage circuit with PWM feedback regulation according to claim 1, wherein the PWM modulation unit (1) comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor, wherein: a first end of the first resistor is connected with the PWM pulse signal source, and a second end of the first resistor is connected with the direct current power supply signal;
the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the first end of the first capacitor, the second end of the first capacitor is grounded, the first end of the first capacitor is also connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the feedback unit (2).
3. The output voltage circuit with PWM feedback regulation according to claim 2, wherein the feedback unit (2) comprises a second capacitor, a fifth resistor, a sixth resistor and a seventh resistor, wherein:
the first end of the second capacitor is respectively connected with the second end of the fifth resistor and the first end of the sixth resistor, the second capacitor is respectively connected with the second end of the fourth resistor and the first end of the seventh resistor, and the second end of the seventh resistor is grounded;
the first end of the fifth resistor is connected with the output end of the rectifying unit (5).
4. An output voltage circuit with PWM feedback regulation according to claim 3, characterized in that the input filter unit (3) comprises a third capacitor, a first end of which is connected to the external power supply signal, and a second end of which is grounded.
5. The output voltage circuit with PWM feedback regulation according to claim 4, wherein the enabling unit (4) comprises an eighth resistor and a fourth capacitor, wherein:
the first end of the eighth resistor is connected with the external power supply signal, the second end of the eighth resistor is respectively connected with the first end of the fourth capacitor and the enabling pin of the first processing chip, and the second end of the fourth capacitor is grounded.
6. The output voltage circuit with PWM feedback regulation according to claim 5, wherein the rectifying unit (5) comprises a first inductor, a first end of the first inductor being connected to an external inductor pin of the first processing chip, and a second end of the first inductor being connected to a first end of the fifth resistor and an input end of the filtering unit, respectively.
7. The output voltage circuit with PWM feedback regulation according to claim 6, wherein the output filtering unit (6) comprises a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein:
a first end of the fifth capacitor is connected with a first end of the fifth resistor, and a second end of the fifth capacitor is grounded;
the first end of the sixth capacitor is connected with the first end of the fifth capacitor, and the second end of the sixth capacitor is grounded;
the first end of the seventh capacitor is respectively connected with the first end of the sixth capacitor and the power supply pin of the power utilization chip, and the second end of the seventh capacitor is grounded.
8. The output voltage circuit with PWM feedback regulation according to claim 7, characterized in that the circuit further comprises a compensation unit (7), the compensation unit (7) being adapted to the feedback unit (2) receiving the output dc voltage value of the output filter unit (6), the compensation unit (7) comprising an input and an output, the input of the compensation unit (7) being connected to the first end of the fifth capacitor, the output of the compensation unit (7) being connected to the second end of the fifth resistor.
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| CN202322396028.9U CN220626933U (en) | 2023-08-31 | 2023-08-31 | Output voltage circuit with PWM feedback regulation |
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