CN220368610U

CN220368610U - Voltage conversion circuit and voltage conversion device

Info

Publication number: CN220368610U
Application number: CN202321510085.9U
Authority: CN
Inventors: 冯文斌; 钟声
Original assignee: Guangzhou Asensing Technology Co Ltd
Current assignee: Guangzhou Asensing Technology Co Ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2024-01-19
Anticipated expiration: 2033-06-13

Abstract

The application relates to the technical field of electronics, in particular to a voltage conversion circuit and a voltage conversion device, wherein the voltage conversion circuit comprises a voltage conversion module, an input end of the voltage conversion module is electrically connected with a voltage to be converted, and the voltage conversion module is used for converting and outputting the voltage to be converted under control; the voltage conversion module comprises a first resistor, a second resistor and a first control element, wherein the first control element is a triode or an N-channel MOS tube, and the first control element comprises three pins; the first resistor is connected with the second resistor in series and then grounded, two ends of the second resistor are respectively connected with the first pin and the second pin of the first control element, and the third pin of the first control element outputs converted voltage. The voltage conversion module in the application comprises a first resistor, a second resistor and a first control switch, and each device is convenient to obtain materials, low in production cost, high in response speed and capable of reducing the time delay triode.

Description

Voltage conversion circuit and voltage conversion device

Technical Field

The present utility model relates to the field of electronic technologies, and in particular, to a voltage conversion circuit and a voltage conversion device.

Background

In industrial control and many sensor applications, the analog signal is typically output as a voltage. The voltage/current conversion, i.e. V/I conversion, is to convert an input voltage signal into a current signal satisfying a certain relation, and the converted current corresponds to a constant current source with adjustable output, and the output current should be stable and not change with the change of the load.

At present, PPS conversion in the market mainly uses a chip for conversion, but the cost of using the chip is high and has a relatively large transmission delay. This transmission delay should be minimized because PPS requires a relatively high degree of accuracy.

Disclosure of Invention

In view of the foregoing, an object of the present application is to provide a voltage conversion circuit and a voltage conversion device.

In a first aspect, embodiments of the present application provide a voltage conversion circuit, the circuit including:

the input end of the voltage conversion module is electrically connected with the voltage to be converted and is used for converting and outputting the voltage to be converted under control;

the voltage conversion module comprises a first resistor, a second resistor and a first control element, wherein the first control element is a triode or an N-channel MOS tube, and the first control element comprises three pins; the first resistor is connected with the second resistor in series and then grounded, two ends of the second resistor are respectively connected with the first pin and the second pin of the first control element, and the third pin of the first control element is a voltage output end and is used for outputting converted voltage.

In combination with the first aspect, the first control element is a first triode, the first pin is electrically connected with a base electrode of the first triode, the second pin is electrically connected with an emitter electrode of the first triode, and the third pin is electrically connected with a collector electrode of the first triode.

With reference to the first aspect, the circuit further includes:

and the overcurrent protection module is connected with the second resistor in parallel and is used for protecting the voltage conversion module when the voltage conversion module is overloaded with current.

With reference to the first aspect, the overcurrent protection module includes a third resistor, a fourth resistor and a second triode, where a base electrode of the second triode is connected in series with the third resistor; the collector electrode and the emitter electrode of the second triode are respectively and electrically connected with two ends of the second resistor;

and one end of the fourth resistor is electrically connected with the third resistor and the emitter of the first triode respectively, and the other end of the fourth resistor is grounded.

In combination with the first aspect, the first control element is a first N-channel MOS transistor, a gate of the first N-channel MOS transistor is electrically connected to the first resistor, a source of the first N-channel MOS transistor is grounded, and a drain of the first N-channel MOS transistor is a voltage output terminal.

With reference to the first aspect, the circuit further includes: an overcurrent protection module; the overcurrent protection module comprises a third resistor, a fourth resistor and a second N-channel MOS tube;

the grid electrode of the second N-channel MOS tube is electrically connected with the third resistor; the drain electrode and the source electrode of the N-channel MOS tube are respectively and electrically connected with the two ends of the second resistor;

one end of the fourth resistor is electrically connected with the third resistor and the source electrode of the N-channel MOS tube respectively, and the other end of the fourth resistor is grounded.

In combination with the first aspect, a fifth resistor is further disposed between the collector of the first triode and the power supply voltage.

With reference to the first aspect, the fifth resistor is an adjustable resistor.

With reference to the first aspect, a first capacitor is connected in parallel between the second pin and the third pin of the first control element.

With reference to the first aspect, the method further includes: the auxiliary power supply conversion module is arranged between the input end of the voltage conversion module and the voltage to be converted and is used for carrying out auxiliary conversion on the voltage to be converted.

With reference to the first aspect, the auxiliary power conversion module includes:

the sixth resistor is electrically connected with the voltage to be converted;

a seventh resistor connected in series with the sixth resistor and electrically connected to a power supply voltage;

the third control element is connected in series with the sixth resistor and connected in parallel with the seventh resistor, the first pin of the third control element is electrically connected with the sixth resistor, the second pin of the third control element is electrically connected with the power supply voltage, and the third pin of the third control element is electrically connected with the voltage conversion module.

With reference to the first aspect, the third control element is a P-channel MOS transistor, and a gate of the P-channel MOS transistor is electrically connected to one end of the sixth resistor and one end of the seventh resistor respectively; the source electrode of the P channel MOS tube is electrically connected with the other end of the seventh resistor, and the drain electrode of the P channel MOS tube is electrically connected with the first resistor.

In combination with the first aspect, the third control element is a third triode, the first pin is electrically connected with a base electrode of the third triode, the second pin is electrically connected with an emitter electrode of the third triode, and the third pin is electrically connected with a collector electrode of the third triode.

With reference to the first aspect, the voltage to be converted is PPS signal output voltage.

In a second aspect, the present application provides a voltage conversion device, including the above circuit, configured to convert an input voltage to be converted and output the converted voltage.

With reference to the second aspect, the device further includes a control module, where the control module is electrically connected to the voltage conversion module and the overcurrent protection module, respectively, and is configured to detect an amount of current of the voltage conversion module in the voltage conversion process, and conduct or block the overcurrent protection module according to the amount of current.

With reference to the second aspect, the apparatus applied to the foregoing apparatus, the apparatus includes an overcurrent protection module, and the method includes:

obtaining the output current of a voltage conversion module;

judging whether the output current is larger than a preset overcurrent protection current value or not;

if so, the overcurrent protection module is turned on to block the voltage output.

With reference to the second aspect, after the step of determining whether the output current is greater than a preset overcurrent protection current value, the method further includes:

if not, the overcurrent protection module is blocked to output the conversion voltage.

The embodiment of the application brings the following beneficial effects: the application provides a voltage conversion circuit and voltage conversion device, voltage conversion circuit includes: the input end of the voltage conversion module is electrically connected with the voltage to be converted and is used for converting and outputting the voltage to be converted under control; the voltage conversion module comprises a first resistor, a second resistor and a first control element, wherein the first control element is a triode or an N-channel MOS tube, and the first control element comprises three pins; the first resistor is connected with the second resistor in series and then grounded, two ends of the second resistor are respectively connected with the first pin and the second pin of the first control element, and the third pin of the first control element outputs converted voltage. The voltage conversion module in the application comprises a first resistor, a second resistor and a first control switch, and each device is convenient to obtain, low in triode production cost, high in response speed and capable of reducing time delay.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a voltage conversion circuit structure diagram provided in embodiment 1 of the present application;

fig. 2 is a voltage conversion circuit structure diagram provided in embodiment 2 of the present application;

fig. 3 is a voltage conversion circuit structure diagram provided in embodiment 3 of the present application;

fig. 4 is a schematic diagram of another voltage conversion circuit according to embodiment 4 of the present application.

Reference numerals:

the high-voltage power supply comprises a 1-voltage conversion module, a 11-first resistor, a 12-second resistor, a 13-first triode, a 14-first N-channel MOS (metal oxide semiconductor) transistor, a 2-overcurrent protection module, a 21-third resistor, a 22-fourth resistor, a 23-second triode, a 24-second N-channel MOS transistor, a 3-fifth resistor, a 4-first capacitor, a 5-auxiliary power supply conversion module, a 51-sixth resistor, a 52-seventh resistor, a 53-third triode and a 54-P-channel MOS transistor.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In order to facilitate understanding of the present embodiment, technical terms designed in the present application will be briefly described below.

PPS: pulse per second pulse=1 Pulse/1 s, also known as time synchronization, is the synchronization of the system clock by receiving the clock signal of the GNSS. At present, PPS in the market is converted mainly by a chip, and the cost of using the chip is high, and there is a relatively large transmission delay.

The GNSS module outputs square wave signals with the period of 1s, the square wave signals are directly output by the module, the general voltage is 3.3V, the conversion circuit converts the signals into required voltages according to the needs, such as 5V,12V and the like, and the converted signals are still square wave signals with the period of 1 s.

If the conversion circuit is not used, the GNSS signals are directly led out, voltage mismatch can occur, the GNSS module can be damaged when the GNSS module is seriously used.

EMC acronym Electromagnetic Compatibility, electromagnetic compatibility, requires no serious interference sources or equipment in electronic equipment such as power modules, or better anti-interference capability of a power system. EMC includes two parts, namely EMI (electromagnetic interference) and EMS (electromagnetic tolerance), wherein the EMI electromagnetic interference is electromagnetic noise which is generated by a machine itself in the process of executing a due function and is unfavorable to other systems; and EMS refers to the ability of a machine to be immune to the surrounding electromagnetic environment during the execution of the intended function. EMC includes two requirements: on one hand, electromagnetic interference generated by equipment on the environment in the normal operation process cannot exceed a certain limit value; on the other hand, the device has a certain degree of immunity, namely electromagnetic sensitivity, to electromagnetic interference existing in the environment. By electromagnetic interference is meant any electromagnetic phenomenon that can degrade the performance of a device or system. By electromagnetic interference is meant a degradation of a device or system due to electromagnetic interference.

In the design of electronic products, it is important to design the EMC of the product in order to obtain good EMC performance and cost ratio; EMC performance of electronic products is design-imposed. The test merely characterizes the inherent EMC performance of the electronic product in a quantitative way.

After technical terms related to the application are introduced, application scenes and design ideas of the embodiment of the application are briefly introduced.

In industrial control and many sensor applications, the analog signal is typically output as a voltage. When analog signals are transmitted in a voltage mode for a long distance, voltage attenuation is caused by a signal source resistor, a direct current resistor of a transmission line and the like, and the lower the input resistor of a signal receiving end is, the larger the voltage attenuation is. In order to avoid attenuation of signals in the transmission process, only the input resistance of the signal receiving end is increased, but the increase of the input resistance of the signal receiving end reduces the anti-interference performance of a transmission line, is easy to be interfered by the outside, and is unstable in signal transmission, so that when analog signals are transmitted for a long distance, a voltage output mode cannot be used, and voltage output is converted into current output. In addition, in many conventional industrial meters, current-mode coupling also requires an output to convert a voltage output to a current output. The V/I converter converts the voltage output signal into the current output signal, which is beneficial to long-distance signal transmission. The voltage/current conversion, i.e. V/I conversion, is to convert an input voltage signal into a current signal satisfying a certain relation, and the converted current corresponds to a constant current source with adjustable output, and the output current should be stable and not change with the change of the load. In general, the voltage-current conversion circuit is realized in a negative feedback mode, and can be current series negative feedback or current parallel negative feedback, and is mainly used for industrial control and application of a plurality of sensors. At present, PPS conversion in the market mainly uses a chip for conversion, but the cost of using the chip is high and has a relatively large transmission delay. This transmission delay should be minimized because PPS requires a relatively high degree of accuracy.

Based on this, the embodiments of the present application provide a voltage conversion circuit, a voltage conversion device, and a control method of the voltage conversion circuit, which are low in cost and capable of effectively shortening transmission delay.

Example 1

Referring to fig. 1, a voltage conversion circuit according to an embodiment of the present application includes: the input end of the voltage conversion module 1 is electrically connected with the voltage to be converted and is used for converting and outputting the voltage to be converted under control;

the voltage conversion module 1 comprises a first resistor 11, a second resistor 12 and a first control element. The control element comprises three pins; the first resistor 11 is connected in series with the second resistor 12 and then grounded, two ends of the second resistor 12 are respectively connected with a first pin and a second pin of the control element, and a third pin of the control element is used for outputting the converted voltage.

In this embodiment, the first control element is a first triode. The voltage conversion module 1 in this embodiment includes a first resistor 11, a second resistor 12, and a first transistor 13. The first resistor 11 is connected in series with the second resistor 12 and then grounded, two ends of the second resistor 12 are respectively and electrically connected with the base electrode and the emitter electrode of the first triode 13, and the collector electrode of the first triode 13 outputs the converted voltage.

In this embodiment of the present application, the voltage conversion module 1 includes a first resistor 11, a second resistor 12 and a first triode 13, which are all relatively common elements, and converts the voltage to be converted to output through electrical connection, so that the production cost is low, and the characteristic of fast response speed of the triode is utilized, so that the response speed of the voltage conversion circuit can be effectively improved, and the time delay can be reduced.

Example 2

As shown in connection with fig. 2, another voltage conversion circuit is provided in an embodiment of the present application, which includes a voltage conversion module 1 and an overcurrent protection module 2.

The voltage conversion module 1 comprises a first resistor 11, a second resistor 12 and a first transistor 13. The first resistor 11 is connected in series with the second resistor 12 and then grounded, two ends of the second resistor 12 are respectively and electrically connected with the base electrode and the emitter electrode of the first triode 13, and the collector electrode of the first triode 13 outputs the converted voltage.

The overcurrent protection module 2 is connected in parallel with the second resistor 12 for protecting the voltage conversion module 1 in case of current overload of the voltage conversion module 1.

In this way, the safety and reliability of the voltage conversion circuit can be further improved.

As an embodiment, the overcurrent protection module 2 includes a third resistor 21, a fourth resistor 22, and a second control element. In this embodiment, the second control element is a second triode 23, and the base electrode of the second triode 23 is connected in series with the third resistor 21; the collector and emitter of the second triode 23 are respectively and electrically connected with the two ends of the second resistor 12; one end of the fourth resistor 22 is electrically connected with the third resistor 21 and the emitter of the first triode 13 respectively, and the other end is grounded.

Similarly, the overcurrent protection module is formed by the electrical connection between the common resistor and the triode, so that the production cost is low and the response speed is high.

It should be noted that, the third resistor 21, the fourth resistor 22 and the second transistor 23 are used for over-current protection, wherein the fourth resistor 22 is used for over-current protection, and the resistance of the fourth resistor 22 used in the present embodiment is 47 Ω as shown in fig. 2 according to the required protection current. Wherein the set protection current is calculated according to the following formula:

I _set ＝0.7/R；

wherein I is _set To set the protection current value, R is the resistance of the fourth resistor 22.

The set protection current iset=0.4/47≡15mA is calculated.

The third resistor 21 is used for limiting current, 1kΩ is generally selected, the NPN triode of the second triode 23 is used for overcurrent protection, when the current exceeds the set protection current, the second triode 23 is turned on, the base of the first triode 13 is pulled down, and thus the output is turned off, and protection is achieved. Meanwhile, the overcurrent protection parameter can be adjusted by adjusting the resistance value of the fourth resistor 22, and the use requirement can be flexibly adapted. Different operations are executed by judging the relation between the current flow of the output current and the preset overcurrent protection current value, and when the current flow is larger than the preset overcurrent protection current value, the overcurrent protection function is started; and when the current flow is smaller than or equal to a preset overcurrent protection current value, the conversion voltage is normally output. This can improve the safety and reliability of use.

As an implementation manner, a fifth resistor 3 is further disposed between the collector of the first triode 13 and the power supply voltage.

As an implementation manner, the fifth resistor 3 is an adjustable resistor.

The fifth resistor 3 is used for pull-up, typically 10kΩ, and the specific pull-up voltage can be changed according to the application scenario, for example, the voltage that the customer needs to identify is 5V, and the pull-up voltage of 5V is used, and in this embodiment, the pull-up voltage is 3.3V, as shown in fig. 2.

As an implementation manner, a first capacitor 4 is connected in parallel between the emitter and the collector of the first triode 13. The first capacitor 4 is used for electrostatic protection, typically using 0.1uF, and the capacitance value can be modified according to the electromagnetic compatibility modification effect.

Example 3

Referring to fig. 3, the embodiment of the present application provides another voltage conversion circuit, and compared with the above embodiment, the circuit further includes an auxiliary power conversion module 5, wherein an input end of the voltage conversion module 1 is electrically connected with the voltage to be converted for controlling the voltage to be converted and output, and the auxiliary power conversion module 5 is disposed between the input end of the voltage conversion module 1 and the voltage to be converted for auxiliary conversion of the voltage to be converted.

The voltage conversion module 1 is electrically connected with the voltage to be converted, the output waveform is opposite to the waveform of the voltage to be converted, and only the low-resistance state and the high-resistance state are output, and after the auxiliary power conversion module 5 is additionally arranged, the waveform in the same direction as the voltage to be converted can be output, and the high-low level can be output.

As an embodiment, the auxiliary power conversion module 5 includes: a sixth resistor 51, a seventh resistor 52, a third control element.

The sixth resistor 51 is electrically connected to the voltage to be converted.

The seventh resistor 52 is electrically connected to the power voltage after being connected in series with the sixth resistor 51.

The third control element is connected in series with the sixth resistor 51 and connected in parallel with the seventh resistor 52, the first pin of the third control element is electrically connected with the sixth resistor 51, the second pin of the third control element is electrically connected with the power supply voltage, and the third pin of the third control element is electrically connected with the voltage conversion module 1.

In this embodiment, the third control element may be a P-channel MOS transistor or a triode, and, as shown in fig. 4, the third control element is a third triode 53, where the triode 53 is connected in series with the sixth resistor 51 and connected in parallel with the seventh resistor 52, the base of the first triode 13 is electrically connected with the sixth resistor 51, the emitter of the third triode 53 is electrically connected with the power supply voltage, and the collector of the third triode 53 is electrically connected with the voltage conversion module 1.

Example 4

Referring to fig. 4, in this embodiment, the first control element is a first N-channel MOS transistor 14, and the second control element is a second N-channel MOS transistor 24; the third control element is a P-channel MOS transistor 54.

In this embodiment, the voltage conversion module 1 includes a first resistor 11, a second resistor 12, and a first N-channel MOS transistor 14. The first resistor 11 is connected in series with the second resistor 12 and then grounded, two ends of the second resistor 12 are electrically connected with the gate (G pole) and the drain (D pole) of the first N-channel MOS transistor 14 respectively, and the source (S pole) of the first N-channel MOS transistor 14 outputs the converted voltage.

In this embodiment, the overcurrent protection module 2 includes a third resistor 21, a fourth resistor 22, and a second N-channel MOS transistor 24; the grid electrode of the second N-channel MOS tube 24 is electrically connected with the third resistor 21; the drain electrode and the source electrode of the second N-channel MOS transistor 24 are respectively electrically connected to two ends of the second resistor 12; one end of the fourth resistor is electrically connected with the third resistor 21 and the source electrode of the second N-channel MOS tube 24 respectively, and the other end of the fourth resistor is grounded. The overcurrent protection module 2 is connected in parallel with the second resistor 12 for protecting the voltage conversion module 1 in case of current overload of the voltage conversion module 1.

Similarly, the voltage conversion module and the overcurrent protection module are formed by the electrical connection between the common resistor and the MOS tube, so that the production cost is low and the response speed is high.

In this embodiment, the third control element may be a P-channel MOS transistor 54, and one end of the seventh resistor 52 is electrically connected to the gate of the P-channel MOS transistor 54; the other end of the seventh resistor 52 is electrically connected with the source electrode of the P-channel MOS tube 54, and the drain electrode of the P-channel MOS tube is electrically connected with the first resistor 11;

as an implementation manner, the voltage to be converted is the PPS signal output voltage. Therefore, compared with the voltage conversion mode using a chip in the prior art, the PPS voltage conversion circuit in the embodiment adopts the common resistor and MOS tube combination, so that the cost can be reduced to a greater extent, and the transmission delay can be reduced.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.

In addition, in the description of the embodiments of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those skilled in the art in the specific case.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the foregoing examples are merely illustrative of the technical solution of the present application, and not limiting, and the scope of the present application is not limited thereto, although the present application is described in detail with reference to the foregoing examples, and it will be understood by those skilled in the art that: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A voltage conversion circuit, the circuit comprising:

2. The circuit of claim 1, wherein the first control element is a first transistor, the first pin is electrically connected to a base of the first transistor, the second pin is electrically connected to an emitter of the first transistor, and the third pin is electrically connected to a collector of the first transistor.

3. The circuit of claim 2, wherein the circuit further comprises:

4. The circuit of claim 3, wherein the over-current protection module comprises a third resistor, a fourth resistor, and a second transistor, a base of the second transistor being in series with the third resistor; the collector electrode and the emitter electrode of the second triode are respectively and electrically connected with two ends of the second resistor;

5. The circuit of claim 1, wherein the first control element is a first N-channel MOS transistor, a gate of the first N-channel MOS transistor is electrically connected to the first resistor, a source of the first N-channel MOS transistor is grounded, and a drain of the first N-channel MOS transistor is a voltage output terminal.

6. The circuit of claim 5, wherein the circuit further comprises: an overcurrent protection module; the overcurrent protection module comprises a third resistor, a fourth resistor and a second N-channel MOS tube;

7. The circuit of claim 2, wherein a fifth resistor is further provided between the collector of the first transistor and the supply voltage.

8. The circuit of claim 7, wherein the fifth resistor is an adjustable resistor.

9. The circuit of claim 1, wherein a first capacitance is connected in parallel between the second pin and the third pin of the first control element.

10. The circuit of claim 1, further comprising: the auxiliary power supply conversion module is arranged between the input end of the voltage conversion module and the voltage to be converted and is used for carrying out auxiliary conversion on the voltage to be converted.

11. The circuit of claim 10, wherein the auxiliary power conversion module comprises:

the sixth resistor is electrically connected with the voltage to be converted;

12. The circuit of claim 11, wherein the third control element is a P-channel MOS transistor, and a gate of the P-channel MOS transistor is electrically connected to one end of the sixth resistor and one end of the seventh resistor, respectively; the source electrode of the P channel MOS tube is electrically connected with the other end of the seventh resistor, and the drain electrode of the P channel MOS tube is electrically connected with the first resistor.

13. The circuit of claim 11, wherein the third control element is a third transistor, the first pin is electrically connected to a base of the third transistor, the second pin is electrically connected to an emitter of the third transistor, and the third pin is electrically connected to a collector of the third transistor.

14. The circuit of claim 1, wherein the voltage to be converted is a PPS signal output voltage.

15. A voltage conversion device comprising a circuit according to any one of claims 1 to 14 to convert an input voltage to be converted and output the converted voltage.

16. The device of claim 15, further comprising a control module electrically connected to the voltage conversion module and the over-current protection module, respectively, for detecting an amount of current flowing in the voltage conversion module during the voltage conversion process, and for turning on or off the over-current protection module according to the amount of current.