CN218335755U

CN218335755U - Voltage adjusting circuit and electronic device

Info

Publication number: CN218335755U
Application number: CN202221979296.2U
Authority: CN
Inventors: 吴东; 何述宏
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-01-17
Anticipated expiration: 2032-07-26

Abstract

The application belongs to the technical field of electronic circuits, and particularly relates to a voltage regulating circuit and electronic equipment. The voltage regulation circuit includes: the voltage conversion unit is used for receiving a power supply voltage signal input by a power supply and performing voltage conversion processing on the power supply voltage signal to obtain a power supply signal; the filtering unit is electrically connected with the voltage conversion unit and is used for receiving the power supply signal, filtering the power supply signal and outputting the filtered power supply signal to a target circuit; the first sampling unit is used for sampling the power supply signal input to the filtering unit to obtain a first sampling electric signal and outputting a protection signal when the first sampling electric signal is greater than the reference electric signal; and the switch unit is arranged on a signal transmission path of the power supply signal and is used for disconnecting the signal transmission path when receiving the protection signal. The overcurrent protection circuit can avoid false triggering of overcurrent protection in the power supply circuit.

Description

Voltage adjusting circuit and electronic device

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to a voltage regulating circuit and electronic equipment.

Background

When the power supply supplies power to the load, a corresponding protection circuit is generally configured, and the protection circuit can trigger overcurrent protection when the current is too large, so that the damage to components in the load due to the too large power supply current is avoided.

During the power supply process, especially at the time of starting the power supply, if the load is not started for a period of time, the power supply may charge a device (such as a capacitor device) with an energy storage function in the load, so that a charging overcurrent spike is generated, and the transient spike current may easily and erroneously trigger the overcurrent protection, so that the normal start of the load is disturbed.

Disclosure of Invention

An object of the application is to provide a voltage regulating circuit and an electronic device, which can solve the problem of false triggering of overcurrent protection in a power supply circuit.

Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.

According to an aspect of an embodiment of the present application, there is provided a voltage adjustment circuit including:

the voltage conversion unit is used for receiving a power supply voltage signal input by a power supply and performing voltage conversion processing on the power supply voltage signal to obtain a power supply signal;

the filtering unit is electrically connected with the voltage conversion unit and is used for receiving the power supply signal, filtering the power supply signal and outputting the filtered power supply signal to a target circuit;

the first sampling unit is used for sampling the power supply signal input to the filtering unit to obtain a first sampling electric signal and outputting a protection signal when the first sampling electric signal is greater than a reference electric signal;

and the switch unit is arranged on a signal transmission path of the power supply signal and is used for disconnecting the signal transmission path when the protection signal is received.

In some embodiments of the present application, based on the above technical solutions, the filtering unit includes:

and the first capacitor bank comprises at least one capacitor, the first end of the first capacitor bank is connected with the filtering unit, and the second end of the first capacitor bank is grounded.

In some embodiments of the present application, based on the above technical solution, the voltage conversion unit includes a control subunit, a main switch subunit, a freewheel subunit, and an inductor subunit;

the first end of the main switch subunit is connected with the power supply, and the second end of the main switch subunit is respectively connected with the first end of the inductor subunit and the first end of the follow current subunit; the second end of the follow current subunit is grounded; the second end of the inductor subunit is connected with the input end of the filtering unit; the control subunit is connected with the control end of the main switch subunit;

and the first end or the second end of the inductance subunit is connected with the first sampling unit.

In some embodiments of the present application, based on the above technical solutions, the first sampling unit includes:

the sampling subunit is used for sampling the power supply signal input to the filtering unit to obtain a first sampling electric signal;

and the comparison subunit is used for receiving the first sampling electric signal, comparing the first sampling electric signal with the reference electric signal and outputting a protection signal when the first sampling electric signal is greater than the reference electric signal.

In some embodiments of the present application, based on the above technical solutions, the sampling sub-unit includes:

a sampling resistor connected in series between the voltage conversion unit and the filtering unit;

a differential comparator including a first input electrically connected to a first end of the sampling resistor, and a second input electrically connected to a second end of the sampling resistor; the differential comparator is used for obtaining a first sampling electric signal according to the potential difference signal at the two ends of the sampling resistor.

In some embodiments of the present application, based on the above technical solutions, the switch unit includes:

the input end of the isolation transformation subunit is electrically connected with the output end of the first sampling unit, and the isolation transformation subunit is used for generating a switch trigger signal when receiving the protection signal;

the switch subunit is arranged on the signal transmission path of the power supply signal, the control end of the switch subunit is electrically connected with the output end of the isolation transformation subunit, and the switch subunit is used for disconnecting the signal transmission path when receiving the switch trigger signal.

In some embodiments of the present application, based on the above technical solution, the isolation transformation subunit includes:

the photoelectric coupler comprises a first contact electrically connected with a working voltage input end, a second contact electrically connected with an output end of the first sampling unit, a third contact serving as an output end and a fourth contact used for grounding, and is used for conducting the first contact and the second contact when receiving the protection signal, further conducting the third contact and the fourth contact so as to output the switch trigger signal;

and the control end of the switch tube is electrically connected with the third contact, the first end of the switch tube is electrically connected with the control end of the switch subunit, the second end of the switch tube is used for grounding, and the switch tube is used for transmitting a switch trigger signal to the control end of the switch subunit when the third contact and the fourth contact are switched on.

In some embodiments of the present application, based on the above technical solution, the switch subunit includes: a first switch assembly and a second switch assembly;

the control end of the first switch assembly and the control end of the second switch assembly are both connected with the output end of the isolation conversion subunit; the first end of the first switch assembly is connected with the first end of the second switch assembly, and the first switch assembly and the second switch assembly are connected in series on the signal transmission path.

In some embodiments of the present application, based on the above technical solutions, the voltage adjustment circuit further includes:

and the second sampling unit is used for sampling the power supply signal filtered by the filtering unit to obtain a second sampling electric signal so as to determine the electric energy output parameter of the voltage adjusting circuit.

According to an aspect of an embodiment of the present application, there is provided an electronic apparatus including: a power supply; and a voltage regulation circuit as described in any of the above embodiments.

In the technical scheme provided by the embodiment of the application, the first sampling unit is used for sampling the power supply signal input to the filtering unit to obtain the first sampling electric signal, namely the first sampling electric signal is a current sampling signal of a circuit without filtering, and then whether the protection signal is output or not is determined by using a comparison result between the first sampling electric signal and the reference electric signal. When the first sampling electric signal is larger than the reference electric signal, overcurrent protection can be triggered, and the power supply to the target circuit is stopped. Because the first sampling electric signal is a current sampling signal which is not processed by the filter circuit, even if a charging capacitor or other devices with an energy storage function exist in the target circuit, the overcurrent protection cannot be triggered by an overcurrent peak caused by the electric energy stored in the filter circuit at the electrifying moment, so that the problem of false triggering of the overcurrent protection in the power supply circuit can be solved, and the stability and the reliability of electric energy supply are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 shows a block diagram of a voltage regulation circuit in an embodiment of the present application.

Fig. 2 shows a voltage regulation circuit implemented based on capacitive filtering in an embodiment of the present application.

Fig. 3 shows a voltage regulation circuit with a step-down function in an embodiment of the present application.

Fig. 4 shows a schematic structural diagram of a voltage converting unit in an embodiment of the present application.

FIG. 5 shows a voltage regulation circuit implemented based on electrical signal sampling and comparison in one embodiment of the present application.

Fig. 6 shows a voltage regulation circuit implemented based on switching control in an embodiment of the present application.

Fig. 7 shows a voltage regulation circuit implemented based on output signal sampling in an embodiment of the present application.

The reference numbers are as follows:

110-voltage regulation circuit, 120-power supply, 130-target circuit.

111-voltage transformation unit, 112-filtering unit, 113-first sampling unit, 114-switching unit.

210-first capacitor bank.

310-control subunit, 320-main switching subunit, 330-free-wheeling subunit.

510-sampling subunit, 520-comparing subunit, 511-sampling resistor, 512-differential comparator, 521-comparator.

610-isolation transformation subunit, 620-switch subunit, 611-photocoupler, 612-switch tube, 621-first switch component, 622-second switch component.

710-second sampling unit.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features.

In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, the terms "connected" and "connecting" generally refer to an electrical connection, and should be understood broadly, for example, directly connected, indirectly connected through an intermediary, communicating between two elements, or interacting between two elements. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.

Fig. 1 shows a block diagram of a voltage regulation circuit in an embodiment of the present application. As shown in fig. 1, the voltage regulation circuit 110 in the embodiment of the present application is connected between the power supply 120 and the target circuit 130. The power supply 120 is a device capable of supplying electric energy, and may be a dc power supply or an ac power supply, for example. The target circuit 130 may be a load circuit capable of operating under power driving, such as various home appliances, vehicle-mounted appliances, or industrial appliances. The target circuit 130 may also be a storage circuit, such as a mobile power supply or a charger, capable of temporarily storing or dumping electric energy.

The voltage regulation circuit 110 is used for regulating the voltage of the power supply voltage signal provided by the power supply 120 to adapt to the power requirement of the target circuit 130. For example, the voltage value can be increased or decreased to obtain an operating voltage meeting the load requirement.

As shown in fig. 1, the voltage adjusting circuit 110 in the embodiment of the present application includes a voltage converting unit 111, a filtering unit 112, a first sampling unit 113, and a switching unit 114.

The voltage conversion unit 111 is configured to receive a power supply voltage signal input by the power supply 120, and perform voltage conversion processing on the power supply voltage signal to obtain a power supply signal. The voltage conversion unit 111 may be, for example, a Buck circuit having a step-down function, a Boost circuit having a step-up function, or a Buck-Boost circuit having a step-up/step-down function, or the like.

And the filtering unit 112, the filtering unit 112 is electrically connected to the voltage converting unit 111, and the filtering unit 112 is configured to receive the power supply signal, perform filtering processing on the power supply signal, and output the power supply signal after the filtering processing to the target circuit 130. The filter unit 112 may be, for example, a capacitive filter circuit, an inductive filter circuit, an RC filter circuit composed of a resistive device and a capacitive device, or an LC filter circuit composed of an inductive device and a capacitive device, or the like.

The first sampling unit 113 is configured to sample the power supply signal input to the filtering unit 112 to obtain a first sampled electrical signal, and output a protection signal when the first sampled electrical signal is greater than the reference electrical signal. The first sampling unit 113 may be, for example, a current sampling circuit or a voltage sampling circuit; when the first sampling unit 113 is a current sampling circuit, the first sampled electrical signal obtained by sampling the first sampling unit may be a current signal, and the corresponding reference electrical signal is a current threshold; when the first sampling unit 113 is a voltage sampling circuit, the first sampled electrical signal sampled by the first sampling unit may be a voltage signal, and the corresponding reference electrical signal is a voltage threshold.

And a switching unit 114 disposed on a signal transmission path of the power supply signal, the switching unit 114 being configured to disconnect the signal transmission path when receiving the protection signal. The switching unit 114 may be disposed, for example, between the power supply 120 and the voltage conversion unit 111, or may be disposed between the voltage conversion unit 111 and the filtering unit 112, or may be disposed between the filtering unit 112 and the target circuit 130. When the switching unit 114 receives the protection signal output by the first sampling unit 113, the signal transmission path of the power supply signal may be disconnected, so that the power supply 120 stops supplying power to the target circuit 130, thereby performing an overcurrent protection function.

In the voltage adjustment circuit provided in the embodiment of the application, the first sampling unit 113 samples the power supply signal input to the filtering unit 112 to obtain the first sampling electrical signal, that is, the first sampling electrical signal is a current sampling signal of the unfiltered wave circuit, and then the comparison result between the first sampling electrical signal and the reference electrical signal is used to determine whether to output the protection signal. When the first sampled electrical signal is greater than the reference electrical signal, over-current protection may be triggered to stop the power supply from the power supply 120 to the target circuit 130. Because the first sampling electric signal is a current sampling signal which is not processed by the filter circuit, even if a charging capacitor or other devices with an energy storage function exist in the target circuit, the overcurrent protection cannot be triggered by mistake due to overcurrent spikes caused by the electric energy stored in the filter circuit at the moment of electrifying, so that the problem of mistakenly triggering the overcurrent protection in the power supply circuit can be solved, and the stability and the reliability of electric energy supply are improved.

As shown in fig. 2, the voltage adjustment circuit in the embodiment of the present application includes a voltage conversion unit 111, a filtering unit 112, a first sampling unit 113, and a switching unit 114. The filter unit 112 is a capacitor filter circuit implemented based on the first capacitor bank 210. The first capacitor bank 210 includes at least one capacitor, a first end of the first capacitor bank 210 is electrically connected to the output end of the voltage converting unit 111 as an input end, and a second end of the first capacitor bank 210 is grounded.

In some alternative embodiments, the first capacitor bank 210 may include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5 as shown in fig. 2.

The first capacitor C1 and the fifth capacitor C5 may be nonpolar capacitors with small capacity; for example, the first capacitor C1 is a nonpolar capacitor having a capacitance of 10 μ F and an operating voltage of 50V, and the fifth capacitor C5 is a nonpolar capacitor having a capacitance of 100nF and an operating voltage of 50V. The second capacitor C2, the third capacitor C3 and the fourth capacitor C4 may be polar capacitors with large capacity; for example, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 may be polar capacitors having a capacity of 680 μ F and an operating voltage of 25V.

The power supply signal output by the voltage conversion unit 111 can be decomposed into two parts, namely a direct current signal and an alternating current signal, and the alternating current signal in the power supply signal can be filtered by using the characteristic of the first capacitor bank 210 for cutting off direct current and conducting alternating current and the energy storage characteristic. When the capacitance of the first capacitor bank 210 is larger, the capacitive reactance for the ac signal is smaller, and the filtering effect is better. The capacitance of the first capacitor bank 210 can be set according to a frequency band to be filtered, and is not limited to the example of the specification.

Other circuit units of the voltage adjustment circuit in the embodiment of the present application may adopt the same circuit structure as that in the above embodiment, and are not described herein again.

As shown in fig. 3, the voltage adjusting circuit in the embodiment of the present application includes a voltage converting unit 111, a filtering unit 112, a first sampling unit 113, and a switching unit 114. The voltage conversion unit 111 outputs a power supply signal after performing voltage reduction processing on the power supply voltage signal by using a Buck circuit.

In the embodiment of the present application, the voltage converting unit 111 includes a control subunit 310, a main switching subunit 320, a freewheeling subunit 330, and an inductor subunit 340.

A first end of the main switch subunit 320 is connected to the power supply 120, and a second end of the main switch subunit 320 is connected to a first end of the inductor subunit 340 and a first end of the freewheeling subunit 330, respectively; a second terminal of the freewheel subunit 330 is connected to ground; the second end of the inductor subunit 340 is connected to the filtering unit 112; the control subunit 310 is connected with the control end of the main switch subunit 320; the first terminal or the second terminal of the inductance subunit 340 is connected to the first sampling unit 113.

In some alternative embodiments, the freewheeling subunit 330 may be a diode, with the anode of the diode used for ground and the cathode of the diode connected to the main switching subunit 320. So that the main switching sub-unit 320, the inductor sub-unit 340 and the diode form a free-wheeling loop of buck. In some optional embodiments, the freewheeling subunit 330 may also be a switching tube, and the switching tube includes a first end, a second end, and a controlled end, where the controlled end of the switching tube is connected to the control subunit 310, the first end of the switching tube is connected to the main switching subunit 320, and the second end of the switching tube is used for grounding. Such that the main switching sub-unit 320, the inductor sub-unit 340 and the switching tubes form a free-wheeling loop of buck.

As shown in fig. 4, in the voltage conversion unit provided in the embodiment of the present application, the control subunit 310 may be a control chip 311 capable of generating a control signal, and the control chip 311 has an upper tube driving pin HDRV and a lower tube driving pin LDRV.

The main switch subunit 320 includes a first transistor Q1, a gate of the first transistor Q2 is connected to the upper tube driving pin HDRV of the control chip 311, a drain of the first transistor Q1 is used as a first end to be connected to the power supply, and a source of the first transistor Q1 is used as a second end to be connected to the first end of the inductor subunit 340 and the first end of the freewheel subunit 330, respectively.

The freewheel subunit 330 includes a second transistor Q2, a gate of the second transistor Q2 is connected to the lower tube driving pin LDRV of the control chip 311, a drain of the second transistor Q2 is connected to the source of the first transistor Q1 as a first end, and a source of the second transistor Q2 is connected to ground as a second end.

The inductor subunit 340 includes an inductor element L, which may be, for example, an inductor with an inductance of 23 μ H.

As shown in fig. 5, the voltage adjustment circuit in the embodiment of the present application includes a voltage conversion unit 111, a filtering unit 112, a first sampling unit 113, and a switching unit 114. The first sampling unit 113 includes a sampling subunit 510 and a comparing subunit 520.

The sampling sub-unit 510 is configured to sample the power supply signal input to the filtering unit 112 to obtain a first sampled electrical signal. The input terminal of the comparing subunit 520 is electrically connected to the output terminal of the sampling subunit 510, and the comparing subunit 520 is configured to receive the first sampled electrical signal, compare the first sampled electrical signal with the reference electrical signal, and output a protection signal to the switching unit 114 when the first sampled electrical signal is greater than the reference electrical signal.

With continued reference to fig. 5, in some alternative embodiments, sampling sub-unit 510 may include a sampling resistor 511 and a differential comparator 512. Wherein, the sampling resistor 511 is connected in series between the voltage conversion unit 111 and the filtering unit 112; differential comparator 512 includes a first input terminal electrically connected to a first terminal of sampling resistor 511, and a second input terminal electrically connected to a second terminal of sampling resistor 511; the differential comparator 512 is configured to obtain a first sampling electrical signal according to the potential difference signal at the two ends of the sampling resistor 511, where the first sampling electrical signal may be a voltage signal or a current signal.

Specifically, the differential comparator in this embodiment may be an integrated differential comparator chip, and is configured to amplify and compare the potential difference signal at two ends of the sampling resistor 511, so as to obtain an accurate first sampling electrical signal. It is understood that, according to actual requirements, a filtering circuit connected to the sampling resistor 511 may be further disposed IN the connection paths between the two ends of the sampling resistor 511 and the IN + and IN-ends of the differential comparator 512, respectively, so as to achieve the filtering effect. Illustratively, as shown in fig. 5, a resistor R1 connected to a first end of the sampling resistor 511, a resistor R2 connected to a second end of the sampling resistor 511, and a capacitor C5 and a capacitor C6 connected in parallel with the sampling resistor 511 are provided to filter the electric signal flowing through the sampling resistor 511. In some optional embodiments, the comparing subunit 520 may include a comparator 521, and the comparator 521 is configured to compare the first sampled electrical signal with the reference electrical signal and output a protection signal to the switching unit 114 when the first sampled electrical signal is greater than the reference electrical signal.

With continued reference to fig. 5, in some alternative embodiments, when the first sampling electrical signal is a voltage signal, the 1 st input terminal of the comparator 521 is configured to receive the voltage signal, and the 2 nd input terminal is configured to receive a reference electrical signal, where the reference electrical signal may be a reference voltage signal Vcc1 of 3.3V. The comparator 521 is used for comparing the voltage signal input by the sampling sub-unit 510 with a reference voltage signal Vcc1 of 3.3V, and when the voltage signal is greater than the reference voltage signal Vcc1 of 3.3V, a protection signal is output from the output terminal of the comparator 521.

It should be noted that, a person skilled in the art may also set a plurality of filtering circuits inside the comparison subunit 520 and the connection path between the sampling subunit 510 and the comparison subunit 520 according to actual requirements, so as to filter the voltage signal and the reference voltage signal.

Illustratively, as shown in fig. 5, a resistor R3, a capacitor C3 and a resistor R5 are provided in a connection path between the output terminal of the sampling sub-unit 510 and the 1 st input terminal of the comparator 521. Specifically, the resistor R3 is connected in series between the output terminal of the sampling sub-unit 510 and the 1 st input terminal of the comparator 521; the first end of the capacitor C3 is connected with the resistor R3, and the second end of the capacitor C3 is grounded; the first end of the resistor R5 is connected with the capacitor C3, and the second end is used for grounding. Therefore, the current-limiting filtering is performed on the first sampled electrical signal input into the comparison subunit 520, so as to prevent the comparator 521 from being damaged by the excessively high first sampled electrical signal.

In addition, a resistor R4, a capacitor C4, a resistor R6, a resistor R7, a resistor R8, and a capacitor C9 may be provided in a connection path between the reference voltage signal Vcc1 of 3.3V and the 2 nd input terminal of the comparator 521. Specifically, the first end of the resistor R4 is used for connecting the 3.3V reference voltage signal Vcc1, and the second end is connected to the 2 nd input end of the comparator 521; the first end of the capacitor C4 is connected with the second end of the resistor R4, and the second end is used for grounding; the first end of the resistor R6 is connected with the first end of the capacitor C4, and the second end of the resistor R is used for grounding; a first end of the resistor R7 is connected with a first end of the resistor R6, and a second end of the resistor R is connected with an anode of the diode D1; the cathode of the diode D1 is connected to the output terminal of the comparator 521; the first end of the resistor R8 is used for connecting the voltage of Vcc2, and the second end is connected with the output end of the comparator 521; the first terminal of the capacitor C9 is connected to the output terminal of the comparator 521, and the second terminal is connected to ground. Where Vcc2 may be a voltage signal of 3.3V. Thereby filtering and feeding back the reference voltage signal input to the comparator 521 to prevent the comparator 521 from being damaged.

Fig. 6 shows a voltage regulation circuit implemented based on switch control in an embodiment of the present application.

As shown in fig. 6, the voltage adjustment circuit in the embodiment of the present application includes a voltage conversion unit 111, a filtering unit 112, a first sampling unit 113, and a switching unit 114. The switching unit 114 includes an isolation transformation subunit 610 and a switching subunit 620.

The input end of the isolation transformation subunit 610 is electrically connected to the output end of the first sampling unit 113, and the isolation transformation subunit 610 is configured to generate a switch trigger signal when receiving the protection signal output by the first sampling unit 113.

The switch subunit 620 is disposed on a signal transmission path of the power supply signal, a control end of the switch subunit 620 is electrically connected to an output end of the isolation transformation subunit 610, and the switch subunit 620 is configured to disconnect the signal transmission path of the power supply signal when receiving a switch trigger signal output by the isolation transformation subunit 610.

In some alternative embodiments, the isolation transformer sub-unit 610 includes a photo coupler 611 and a switching tube 612.

The photocoupler 611 includes a first contact 1 electrically connected to an input terminal of the operating voltage Vcc3, a second contact 2 electrically connected to an output terminal of the first sampling unit 113, a third contact 3 as an output terminal, and a fourth contact 4 for grounding, and the photocoupler 611 is configured to conduct the first contact 1 and the second contact 2 when receiving the protection signal output by the first sampling unit 113, and further conduct the third contact 3 and the fourth contact 4, so as to output a switch trigger signal through the third contact 3. In addition, according to actual conditions, a current limiting resistor R8 may be disposed between the first contact 1 of the photocoupler 611 and the connection path of the operating voltage Vcc3 to prevent the photocoupler 611 from being damaged by an excessive operating current, where Vcc3 may be 3.3V.

The control end of the switching tube 612 is electrically connected to the third contact 3 of the photocoupler 611, the first end of the switching tube 612 is electrically connected to the control end of the switch subunit 620, the second end of the switching tube 612 is used for grounding, and the switching tube 612 is used for transmitting a switch trigger signal to the control end of the switch subunit 620 when the third contact 3 and the fourth contact 4 of the photocoupler 611 are conducted. A current-limiting bias resistor R9 may be disposed between the third contact 3 of the photocoupler 611 and the control end of the switching tube 612 according to actual conditions.

In some alternative embodiments, the switching sub-unit 620 includes a first switching assembly 621 and a second switching assembly 622.

The control end of the first switch component 621 and the control end of the second switch component 622 are both connected with the output end of the isolation transformation subunit 610; the first terminal of the first switch component 621 is connected to the first terminal of the second switch component 622, and the first switch component 621 and the second switch component 622 are connected in series on the signal transmission path of the power supply signal.

In some alternative embodiments, the first switch component 621 includes one or more third transistors, wherein a gate of each third transistor is connected to the output terminal of the isolation converting subunit 610, and a drain of each third transistor is connected to the first transmission point on the signal transmission path.

The second switching element 622 includes one or more fourth transistors, wherein the gate of each fourth transistor is connected to the output terminal of the isolation transformation subunit 610, the drain of the fourth transistor is connected to the second transmission point on the signal transmission path, and the source of the fourth transistor is connected to the source of the third transistor. The number of the third transistors or the fourth transistors may be determined according to the maximum current in the circuit and the maximum current allowed by each transistor.

Referring to fig. 6, the first switching element 621 includes two third transistors and the second switching element 622 includes two fourth transistors in the present embodiment. The two third transistors comprise an MOS transistor M1 and an MOS transistor M2 which are connected in parallel; the two fourth transistors comprise a MOS transistor M3 and a MOS transistor M4 which are connected in parallel. The MOS tube M1 and the MOS tube M3 are connected in series in a reverse direction, so that the charging and discharging bidirectional loop on the first transmission point and the second transmission point connection loop is completely cut off or switched on; the MOS transistor M2 is similar to the MOS transistor M4, and is not described again. In addition, the resistor R11 and the resistor R12 in the switch subunit 620 are used for voltage division, and the resistor R10, the resistor R13, the resistor R14 and the resistor R15 are used for current limiting, so as to prevent the MOS transistor from being damaged by an excessive current.

When the first switch component 621 and the second switch component 622 receive the switch trigger signal output by the isolation conversion subunit 610, the connection path between the first transmission point and the second transmission point, that is, the signal transmission path of the power supply signal, may be disconnected.

As shown in fig. 7, the voltage adjustment circuit in the embodiment of the present application includes a voltage conversion unit 111, a filtering unit 112, a first sampling unit 113, a switching unit 114, and a second sampling unit 710.

The second sampling unit 710 is configured to sample the power supply signal filtered by the filtering unit 112 to obtain a second sampled electrical signal, where the second sampled electrical signal may be used to determine an electrical energy output parameter of the voltage adjusting circuit.

The second sampling unit 710 in the embodiment of the present application may have the same circuit structure as the first sampling unit 113, or may have a circuit structure including only a sampling resistor and a differential comparator. It is understood that the circuit structure of the second sampling unit 710 is not limited to the above examples, and those skilled in the art can design the circuit according to practical situations as long as the purpose of sampling the power supply signal filtered by the filtering unit 112 is achieved. In addition, other circuit units in the voltage adjustment circuit in this embodiment may also adopt the same circuit structure as that in the above embodiment, and are not described herein again.

In an embodiment of the present application, there is also provided an electronic device including a power supply and a voltage adjustment circuit as provided in any one of the above embodiments. The electronic device may be, for example, an energy storage device, a solar charging panel, or a solar charger, which can provide power to the target circuit. The target circuit receiving the electrical energy provided by the electronic device may be a capacitive consumer, such as an in-vehicle air pump.

The voltage regulating circuit and the electronic equipment provided by the embodiment of the application can avoid the problem of false triggering of overcurrent protection due to the fact that the target circuit does not generate electric energy consumption within a period of time (for example, a load is not started for a long time), and can improve the operation reliability of related circuits and equipment.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A voltage regulation circuit, comprising:

2. The voltage regulation circuit of claim 1, wherein the filtering unit comprises:

and the first capacitor bank comprises at least one capacitor, the first end of the first capacitor bank is connected with the input end of the filtering unit, and the second end of the first capacitor bank is grounded.

3. The voltage regulation circuit of claim 1, wherein the voltage conversion unit comprises a control subunit, a main switch subunit, a freewheel subunit, and an inductor subunit;

the first end of the main switch subunit is connected with the power supply, and the second end of the main switch subunit is respectively connected with the first end of the inductor subunit and the first end of the follow current subunit; the second end of the follow current subunit is grounded; the second end of the inductor subunit is connected with the filtering unit; the control subunit is connected with the control end of the main switch subunit;

4. The voltage regulation circuit of claim 1, wherein the first sampling unit comprises:

5. The voltage regulation circuit of claim 4, wherein the sampling subunit comprises:

6. The voltage regulation circuit of claim 1, wherein the switching unit comprises:

7. The voltage regulation circuit of claim 6, wherein the isolated transform subunit comprises:

8. The voltage regulation circuit of claim 6, wherein the switching subunit comprises: a first switch assembly and a second switch assembly;

the control end of the first switch assembly and the control end of the second switch assembly are both connected with the output end of the isolation conversion subunit; the first end of the first switch component is connected with the first end of the second switch component, and the first switch component and the second switch component are connected in series on the signal transmission path.

9. The voltage regulation circuit of claim 1, further comprising:

10. An electronic device, comprising:

a power supply; and

a voltage regulation circuit as claimed in any one of claims 1 to 9.