CN219247695U - Standard source device - Google Patents
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- CN219247695U CN219247695U CN202223577085.9U CN202223577085U CN219247695U CN 219247695 U CN219247695 U CN 219247695U CN 202223577085 U CN202223577085 U CN 202223577085U CN 219247695 U CN219247695 U CN 219247695U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present application relates to a standard source device. Comprising the following steps: a voltage conversion circuit for converting an external power supply voltage into a driving voltage output; the voltage reference circuit is connected with the voltage conversion circuit and is used for dividing the driving voltage to obtain standard voltage and outputting the standard voltage; and the voltage follower circuit is connected with the voltage reference circuit and the voltage conversion circuit and is used for working under the drive of the driving voltage so as to convert the standard voltage into a target voltage to be output, wherein the load current of the target voltage output by the voltage follower circuit is larger than a preset value. Therefore, through the device of the application, voltage and current meeting the testing requirement of the charging pile can be provided, and the testing of the charging pile can be conveniently carried out.
Description
Technical Field
The application relates to the technical field of detection, in particular to a standard source device.
Background
With the development of the electric automobile industry, the holding quantity of the electric automobile charging pile continuously rises, and with the continuous increase of the use quantity of the charging pile. It is necessary to detect and calibrate the charging pile before it leaves the factory. When detecting the charging pile, a standard source is required to provide standard voltage and current for the charging pile, so that the charging pile can simulate to work, and then the charging pile is detected. Therefore, how to provide a standard source capable of providing standard voltage and current to the charging pile and meeting the test requirement of the charging pile is a problem to be solved at present.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a standard source device capable of providing a power supply that meets the testing requirements of a charging pile.
A standard source device comprising: a voltage conversion circuit for converting an external power supply voltage into a driving voltage output; the voltage reference circuit is connected with the voltage conversion circuit and is used for dividing the driving voltage to obtain standard voltage and outputting the standard voltage; and the voltage follower circuit is connected with the voltage reference circuit and the voltage conversion circuit and is used for working under the drive of the driving voltage so as to convert the standard voltage into a target voltage to be output, wherein the load current of the target voltage output by the voltage follower circuit is larger than a preset value.
In one embodiment, the voltage conversion circuit includes: the input end of the voltage conversion chip is used for receiving external power supply voltage, the grounding end of the voltage conversion chip is equivalently connected with the first power supply voltage, the negative output end of the voltage conversion chip is equivalently connected with the second power supply voltage, and the positive output end of the voltage conversion chip is connected with the voltage reference circuit and used for outputting the driving voltage, wherein the first equivalent voltage is equal in amplitude and opposite in phase with the external power supply voltage.
In one embodiment, the voltage conversion circuit further includes: the first end of the first filter capacitor is used for being connected with an external power supply voltage, and the second end of the first filter capacitor is equivalently connected with the first filter capacitor; the first end of the second filter capacitor is connected with the input end of the voltage conversion chip, and the second end of the second filter capacitor is connected with the grounding end of the voltage conversion chip.
In one embodiment, the voltage conversion circuit further includes: the first end of the third filter capacitor is connected with the positive output end of the voltage conversion chip, and the second end of the third filter capacitor is connected with the negative output end of the voltage conversion chip; the first end of the fourth filter capacitor is connected with the output port of the driving voltage, and the second end of the fourth filter capacitor is equivalently connected with the second end of the fourth filter capacitor; and the first end of the first current limiting resistor is connected with the output port of the driving voltage, and the second end of the first current limiting resistor is equivalently connected with the second end of the first current limiting resistor.
In one embodiment, the voltage conversion circuit further includes: the first end of the second current limiting resistor is connected with the output port of the driving voltage; the anode of the light-emitting diode is connected with the second end of the second current-limiting resistor, and the cathode of the light-emitting diode is equivalently connected with the second end.
In one embodiment, the voltage reference circuit comprises: the first end of the third current limiting resistor is connected with the output end of the voltage conversion circuit; the negative electrode of the rectifying diode is connected with the second end of the third current limiting resistor; the first end of the first voltage dividing resistor is connected with the second end of the third current limiting resistor, and the second end of the first voltage dividing resistor is connected with the negative electrode of the rectifier diode; the first end of the second voltage dividing resistor is connected with the cathode of the rectifying diode, and the second end of the second voltage dividing resistor is connected with the anode of the rectifying diode; the first end of the first voltage dividing resistor is also used for receiving a reference voltage; the second end of the second voltage dividing resistor is used for being connected with a second equivalent; the first end of the fourth current limiting resistor is connected with the first end of the first voltage dividing resistor; the first end of the third voltage dividing resistor is connected with the second end of the fourth current limiting resistor, and the second end of the third voltage dividing resistor is used for outputting the standard voltage; a fourth voltage dividing resistor, wherein the first end of the fourth voltage dividing resistor is connected with the second end of the third voltage dividing resistor, and the second end of the fourth voltage dividing resistor is equivalently connected with the second end of the fourth voltage dividing resistor; the third voltage dividing resistor and the fourth voltage dividing resistor are used for dividing the reference voltage to obtain the standard voltage, and the standard voltage is output from the second end of the third voltage dividing resistor.
In one embodiment, the voltage reference circuit further comprises: the first end of the fifth filter capacitor is connected with the first end of the first voltage dividing resistor, and the second end of the fifth filter capacitor is connected with the second end of the second voltage dividing resistor; and the first end of the sixth filter capacitor is used for receiving the reference voltage, and the second end of the sixth filter capacitor is equivalently connected with the second end of the sixth filter capacitor.
In one embodiment, the voltage follower circuit includes: the positive input end of the rail-to-rail operational amplifier is connected with the output end of the voltage reference circuit, the power end of the rail-to-rail operational amplifier is connected with the output end of the voltage conversion circuit, the negative input end of the rail-to-rail operational amplifier is connected with the output end of the rail-to-rail operational amplifier, and the output end of the rail-to-rail operational amplifier is used for outputting the target voltage.
In one embodiment, the voltage follower circuit further comprises: a seventh current limiting resistor connected in series between the positive input of the rail-to-rail operational amplifier and the output of the voltage reference circuit; a seventh filter capacitor, wherein a first end of the seventh filter capacitor is connected with a power end of the rail-to-rail operational amplifier, and a second end of the seventh filter capacitor is equivalently connected with a second end of the seventh filter capacitor; an eighth current limiting resistor connected in series between the output of the rail-to-rail operational amplifier and the output port of the target voltage; and the first end of the eighth filter capacitor is connected with the output port of the target voltage, and the second end of the eighth filter capacitor is equivalently connected with the second end of the eighth filter capacitor.
In one embodiment, the magnitude of the standard voltage is equal to the magnitude of the target voltage.
According to the standard source device, the voltage conversion circuit is arranged, so that external power supply voltage can be converted into driving voltage to be output, voltage conversion and isolation are realized, driving voltage is obtained, and the driving voltage is conveniently provided for the whole device. Through setting up voltage reference circuit, can carry out the bleeder processing to driving voltage to obtain required standard voltage, standard voltage is the required voltage of electric pile test promptly, thereby can satisfy the voltage demand of electric pile test, through setting up voltage follower circuit, can cushion, the processing of isolation to standard voltage, and can improve standard voltage's load capacity, convert standard voltage into target voltage output, thereby can satisfy the required voltage and the current demand of electric pile test. Therefore, through the device of the application, voltage and current meeting the testing requirement of the charging pile can be provided, and the testing of the charging pile can be conveniently carried out.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a standard source device in one embodiment;
FIG. 2 is a circuit diagram of a voltage conversion circuit in one embodiment;
FIG. 3 is a circuit diagram of a voltage reference circuit in one embodiment;
FIG. 4 is a circuit diagram of a voltage follower circuit in one embodiment;
FIG. 5 is a schematic diagram of a rail-to-rail operational amplifier in one embodiment;
FIG. 6 is a circuit diagram of a jumper pad in one embodiment.
Reference numerals illustrate:
10-voltage conversion circuit, 20-voltage reference circuit, 30-voltage follower circuit, 11-voltage conversion chip, 19-first jumper pad, 31-rail-to-rail operational amplifier, 40-second jumper pad.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In one embodiment, as shown in FIG. 1, there is provided a standard source device comprising: a voltage conversion circuit 10, a voltage reference circuit 20, a voltage follower circuit 30, wherein:
the voltage conversion circuit 10 is used to convert an external power supply voltage into a drive voltage output.
The external power supply voltage may be, for example, a direct-current voltage of 12V, and the voltage conversion circuit 10 is capable of converting the direct-current voltage of 12V into a direct-current voltage of 5V as the driving voltage.
The voltage reference circuit 20 is connected to the voltage conversion circuit 10, and is configured to divide the driving voltage to obtain a standard voltage, and output the standard voltage.
Specifically, the voltage reference circuit 20 may be a voltage reference chip capable of converting the driving voltage into a high-precision standard voltage for output, and capable of providing the high-precision standard voltage.
Illustratively, the voltage reference circuit 20 is capable of converting a 5V DC voltage to a high precision 75mV voltage output, while a 75mV standard voltage is one that meets the testing requirements of a typical charging pile.
The voltage reference circuit 20 may be a voltage reference chip AZ431AN, for example.
The voltage follower circuit 30 is connected to the voltage reference circuit 20 and the voltage conversion circuit 10, and is configured to operate under the driving of the driving voltage to convert the standard voltage into the target voltage output, wherein the load current of the target voltage output by the voltage follower circuit 30 is greater than a preset value.
Illustratively, the gain of the voltage follower circuit 30 is equal to one, and the standard voltage output by the voltage follower circuit 30 is the standard voltage that follows the input. The voltage follower circuit 30 has the characteristics of high input resistance and low output resistance, and when the input impedance is very high, the voltage follower circuit is equivalent to an open circuit of a preceding stage circuit, and when the output impedance is very low, the voltage follower circuit 30 is equivalent to a constant voltage source, namely, the voltage output by the voltage follower circuit 30 is not influenced by the impedance of a following stage circuit. The voltage follower circuit 30 corresponds to an open circuit to the front-stage circuit, and the output voltage is not affected by the impedance of the rear stage, so that the voltage follower circuit has an isolation function, and can isolate the influence of the load on the input end, thereby improving the stability of the output target voltage. And the voltage follower circuit 30 can also play a role of buffering, and the higher input impedance can better keep the voltage signal, so that the loss of the output target voltage in the transmission process is smaller and more accurate. And the voltage follower circuit 30 can well perform impedance matching due to high input resistance and low output resistance, so that the transmission quality of an electric signal can be improved, and the load capacity of the output voltage can be improved, so that the load capacity of the output target voltage can meet the requirement of a charging pile test.
Illustratively, the standard voltage is a voltage of 75mV and the target voltage is a voltage of 75mV with a load carrying capacity greater than 40 mA. The amplitude of the standard voltage is equal to that of the target voltage, but the loading capacity of the standard voltage is stronger.
In this embodiment, by providing the voltage conversion circuit 10, the external power supply voltage can be converted into the driving voltage for output, so that voltage conversion and isolation are realized, the driving voltage is obtained, and the driving voltage is conveniently provided for the whole device. Through setting up voltage reference circuit 20, can carry out the bleeder processing to driving voltage to obtain required standard voltage, standard voltage is the required voltage of electric pile test promptly, thereby can satisfy the voltage demand of electric pile test, through setting up voltage follower circuit 30, can cushion, the processing of isolation to standard voltage, and can improve the carrying capacity of standard voltage, convert standard voltage into target voltage output, thereby can satisfy the required voltage and the current demand of electric pile test. Therefore, through the device of the application, voltage and current meeting the testing requirement of the charging pile can be provided, and the testing of the charging pile can be conveniently carried out.
In one embodiment, as shown in fig. 2, the voltage conversion circuit 10 includes: a voltage conversion chip 11. The input end of the voltage conversion chip 11 is used for receiving external power supply voltage, the grounding end of the voltage conversion chip 11 is connected with the first equivalent, the negative output end of the voltage conversion chip 11 is connected with the second equivalent, the positive output end of the voltage conversion chip 11 is connected with the voltage reference circuit and used for outputting driving voltage, and the voltage of the first equivalent is equal to the external power supply voltage in amplitude and opposite in phase.
Specifically, the voltage conversion chip 11 is capable of converting the input electric energy of a voltage value into an electric energy output of another voltage value.
The voltage conversion chip 11 is an isolated DC-DC (voltage conversion) circuit with an input of 12V and an output of 5V, for example.
The external supply voltage is, for example, 12V, and the first equivalent ground voltage is-12V.
The voltage conversion chip 11 may be, for example, a B1205LS-1WR2 chip.
In this embodiment, by providing the voltage conversion chip 11, voltage conversion is achieved, and the external power supply voltage can be converted into the driving voltage, so as to meet the power supply requirements of each circuit in the standard source device.
In one embodiment, referring to fig. 2, the voltage conversion circuit 10 further includes: a first filter capacitor C1, a second filter capacitor C2, wherein:
the first end of the first filter capacitor C1 is used for being connected with an external power supply voltage, and the second end of the first filter capacitor C1 is equivalently connected with the first end.
The first filter capacitor C1 may have a nominal voltage of 10uf±10% and 25V, for example.
The first end of the second filter capacitor C2 is connected to the input end of the voltage conversion chip 11, and the second end of the second filter capacitor C2 is connected to the ground end of the voltage conversion chip 11.
The second filter capacitor C2 may have a nominal voltage of 100uf±10% and 50V, for example.
In this embodiment, the first filter capacitor C1 and the second filter capacitor C2 are provided to filter the external power supply voltage, so that noise and noise in the external power supply voltage are reduced, and accuracy of the external power supply voltage is improved.
In one embodiment, referring to fig. 2, the voltage conversion circuit 10 further includes: the third filter capacitor C3, the fourth filter capacitor C4 and the first current limiting resistor R1, wherein:
the first end of the third filter capacitor C3 is connected with the positive output end of the voltage conversion chip 11, and the second end of the third filter capacitor C3 is connected with the negative output end of the voltage conversion chip 11.
The third filter capacitor C3 may have a nominal voltage of 10uf±20% and 16V, for example.
The first end of the fourth filter capacitor C4 is connected to the output port of the driving voltage, and the second end of the fourth filter capacitor C4 is equivalently connected to the second end.
Illustratively, the fourth filter capacitor C4 may have a nominal voltage of 100nf±10%, 50V.
The first end of the first current limiting resistor R1 is connected with the output port of the driving voltage, and the second end of the first current limiting resistor R1 is equivalently connected with the second end.
Illustratively, the first current limiting resistor R1 may have a specification of 270 Ω±5%.
In the present embodiment, the third filter capacitor C3 and the fourth filter capacitor C4 are provided to filter the driving voltage output from the voltage conversion chip 11, thereby reducing noise and noise in the driving voltage and improving the accuracy of the driving voltage. By setting the first current limiting resistor R1, the current of the driving voltage output port line is limited, and the safety is improved.
In one embodiment, referring to fig. 2, the voltage conversion circuit 10 further includes: the second current limiting resistor R2, the light emitting diode D1, wherein:
the first end of the second current limiting resistor R2 is connected with the output port of the driving voltage.
Illustratively, the second current limiting resistor R2 may have a specification of 1kΩ±1%.
The positive electrode of the light emitting diode D1 is connected with the second end of the second current limiting resistor R2, and the negative electrode of the light emitting diode D1 is equivalently connected with the second end.
The light emitting diode D1 may be an LD301 type diode, for example.
In this embodiment, by providing the second current limiting resistor R2, the current in the line is limited, the safety of the line is improved, and by providing the light emitting diode D1, light can be emitted when the current exists in the line, so that the operation state of the voltage conversion circuit 10 can be indicated.
Illustratively, referring to fig. 2, the voltage conversion circuit 10 further includes: a first jumper pad 19. A first pin of the first jumper pad 19 is connected with an input terminal of the voltage conversion chip 11, and a second pin of the first jumper pad 19 is equivalently connected with the first pin. The first jumper wire bonding pad 19 is used as a connector and a pin header so as to facilitate connection between different circuits.
In one embodiment, as shown in fig. 3, the voltage reference circuit 20 includes: the third current limiting resistor R3, the rectifier diode D2, the first voltage dividing resistor R4, the second voltage dividing resistor R5, the fourth current limiting resistor R6, the third voltage dividing resistor R7 and the fourth voltage dividing resistor R8, wherein:
the first end of the third current limiting resistor R3 is connected to the output terminal of the voltage conversion circuit 10.
Illustratively, the third current limiting resistor R3 may have a specification of 100deg.C, 1/10W+ -1%.
The cathode of the rectifying diode D2 is connected with the second end of the third current limiting resistor R3.
The first end of the first voltage dividing resistor R4 is connected with the second end of the third current limiting resistor R3, and the second end of the first voltage dividing resistor R4 is connected with the cathode of the rectifying diode D2.
Illustratively, the first voltage dividing resistor R4 may have a specification of 3.3KΩ,1/10 W+ -1%.
The first end of the second voltage dividing resistor R5 is connected with the cathode of the rectifying diode D2, and the second end of the second voltage dividing resistor R5 is connected with the anode of the rectifying diode D2.
Illustratively, the second shunt resistor R5 may have a specification of 10KΩ, 1/10W+ -1%.
The first end of the first voltage dividing resistor R4 is also used for receiving a reference voltage.
Specifically, the first end of the first voltage dividing resistor R4 is used to output the standard voltage.
The reference voltage may be 3.3V, for example.
The drive voltage is, for example, 5V, with a standard voltage of 75mV.
The second terminal of the second shunt resistor R5 is adapted to be connected equally to a second.
The first end of the fourth current limiting resistor R6 is connected with the first end of the first voltage dividing resistor R4;
illustratively, the fourth current limiting resistor R6 may be 1KΩ,1/10 W+ -1%.
And a first end of the third voltage dividing resistor R7 is connected with a second end of the fourth current limiting resistor R6, and a second end of the third voltage dividing resistor R7 is used for outputting standard voltage.
The third voltage dividing resistor R7 may be, for example, 43kΩ,1/10w±1%.
And a fourth voltage dividing resistor R8, wherein a first end of the fourth voltage dividing resistor R8 is connected with a second end of the third voltage dividing resistor R7, and a second end of the fourth voltage dividing resistor R8 is equivalently connected with a second end.
Illustratively, the fourth divider resistor R8 may have a specification of 1KΩ,1/10 W+ -1%.
The third voltage dividing resistor R7 and the fourth voltage dividing resistor R8 are used for dividing the reference voltage to obtain a standard voltage, and the standard voltage is output from the second end of the third voltage dividing resistor R7.
In this embodiment, the third current limiting resistor R3 is provided to limit the current of the line, thereby protecting the circuit. Through setting up rectifier diode D2, restricted the direction of electric current, through setting up first divider resistance R4 and second divider resistance R5, realized the preliminary partial pressure processing to driving voltage, through setting up fourth current limiting resistance R6, limited the electric current of circuit, through setting up third divider resistance R7 and fourth divider resistance R8, divided the reference voltage to standard voltage has been obtained.
In one embodiment, referring still to fig. 3, the voltage reference circuit 20 further comprises: a fifth filter capacitor C5 and a sixth filter capacitor C6, wherein:
the first end of the fifth filter capacitor C5 is connected to the first end of the first voltage dividing resistor R4, and the second end of the fifth filter capacitor C5 is connected to the second end of the second voltage dividing resistor R5.
Illustratively, the fifth filter capacitor C5 may have a nominal voltage of 10uf±10%, 25V.
The first end of the sixth filter capacitor C6 is configured to receive the reference voltage, and the second end of the sixth filter capacitor C6 is equivalently connected to the second end.
Illustratively, the sixth filter capacitor C6 may have a nominal voltage of 100nf±10%, 50V.
In this embodiment, the standard voltage obtained through the voltage division process is filtered by setting the fifth filter capacitor C5 and the sixth filter capacitor C6, so that noise and noise in the standard voltage are reduced, and accuracy of the standard voltage is improved.
For example, referring to fig. 2 and 3, point a in fig. 2 and 3 is connected together, thereby realizing connection of the voltage conversion circuit 10 and the voltage reference circuit 20.
In one embodiment, as shown in fig. 4, the voltage follower circuit 30 includes: rail-to-rail operational amplifier 31. The positive input terminal of the rail-to-rail operational amplifier 31 is connected with the output terminal of the voltage reference circuit 20, the power supply terminal of the rail-to-rail operational amplifier 31 is connected with the output terminal of the voltage conversion circuit 10, the negative input terminal of the rail-to-rail operational amplifier 31 is connected with the output terminal of the rail-to-rail operational amplifier 31, and the output terminal of the rail-to-rail operational amplifier 31 is used for outputting a target voltage.
In particular, the rail-to-rail operational amplifier 31 is an operational amplifier that can operate normally in the common mode voltage range (commonly referred to as the rail-to-rail voltage range). Common mode input and output from high potential to low potential can be realized. The input potential of the rail-to-rail operational amplifier 31 may vary throughout the negative to positive power supply, even slightly above the positive power supply or slightly below the negative power supply being allowed. The output potential of the rail-to-rail operational amplifier 31 may vary throughout the negative to positive power supply interval. The swing of the input voltage and the output voltage are very close and almost equal. Thus, output of one-to-one input voltage can be realized.
For example, the rail-to-rail operational amplifier 31 may be an MD1324 chip, which can implement one-to-one conversion of input and output, has stable unity gain, has a bandwidth gain product of 1MHz, can convert an input voltage of 75mV into an output voltage of 75mV, and can output a current of 40mA or more.
Illustratively, a schematic diagram of the rail-to-rail operational amplifier 31 is shown in FIG. 5.
In the present embodiment, by providing the rail-to-rail operational amplifier 31, the rail-to-rail operational amplifier 31 is used as a voltage follower, and conversion of the standard voltage into the target voltage output is achieved.
In one embodiment, referring to fig. 4, the voltage follower circuit 30 further includes: a seventh current limiting resistor R9, a seventh filter capacitor C7, an eighth current limiting resistor R10, and an eighth filter capacitor C8, wherein:
the seventh current limiting resistor R9 is connected in series between the positive input of the rail-to-rail operational amplifier 31 and the output of the voltage reference circuit 20.
The first end of the seventh filter capacitor C7 is connected to the power supply end of the rail-to-rail operational amplifier 31, and the second end of the seventh filter capacitor C7 is equivalently connected to the second.
The eighth current limiting resistor R10 is connected in series between the output terminal of the rail-to-rail operational amplifier 31 and the output port of the target voltage.
The first end of the eighth filter capacitor C8 is connected to the output port of the target voltage, and the second end of the eighth filter capacitor C8 is equivalently connected to the second end.
In this embodiment, by setting the seventh current limiting resistor R9 and the eighth current limiting resistor R10, the current in the line can be limited, so as to improve the safety of the line, and by setting the eighth filter capacitor C8 and the seventh filter capacitor C7, the voltage signal can be filtered, noise in the voltage signal can be removed, and the accuracy of the voltage signal can be improved.
For example, referring to fig. 3 and 4, point B in fig. 3 and 4 is connected together, thereby realizing the connection of the voltage reference circuit 20 and the voltage follower circuit 30.
For example, as shown in fig. 6, a second jumper pad 40 may be provided, a second pin of the second jumper pad 40 being connected to the output terminal of the voltage follower circuit 30, and a first pin of the second jumper pad 40 being equivalently connected to a second. The second jumper pad 40 is used as a connector and as a pin header to facilitate connection between different circuits. A target voltage of 0.75V can be provided as a socket to a plurality of different charging piles.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A standard source device, comprising:
a voltage conversion circuit for converting an external power supply voltage into a driving voltage output;
the voltage reference circuit is connected with the voltage conversion circuit and is used for dividing the driving voltage to obtain standard voltage and outputting the standard voltage;
and the voltage follower circuit is connected with the voltage reference circuit and the voltage conversion circuit and is used for working under the drive of the driving voltage so as to convert the standard voltage into a target voltage to be output, wherein the load current of the target voltage output by the voltage follower circuit is larger than a preset value.
2. The standard source device of claim 1, wherein the voltage conversion circuit comprises:
the input end of the voltage conversion chip is used for receiving external power supply voltage, the grounding end of the voltage conversion chip is equivalently connected with the first power supply voltage, the negative output end of the voltage conversion chip is equivalently connected with the second power supply voltage, and the positive output end of the voltage conversion chip is connected with the voltage reference circuit and used for outputting the driving voltage, wherein the first equivalent voltage is equal in amplitude and opposite in phase with the external power supply voltage.
3. The standard source device of claim 2, wherein the voltage conversion circuit further comprises:
the first end of the first filter capacitor is used for being connected with an external power supply voltage, and the second end of the first filter capacitor is equivalently connected with the first filter capacitor;
the first end of the second filter capacitor is connected with the input end of the voltage conversion chip, and the second end of the second filter capacitor is connected with the grounding end of the voltage conversion chip.
4. The standard source device of claim 2, wherein the voltage conversion circuit further comprises:
the first end of the third filter capacitor is connected with the positive output end of the voltage conversion chip, and the second end of the third filter capacitor is connected with the negative output end of the voltage conversion chip;
the first end of the fourth filter capacitor is connected with the output port of the driving voltage, and the second end of the fourth filter capacitor is equivalently connected with the second end of the fourth filter capacitor;
and the first end of the first current limiting resistor is connected with the output port of the driving voltage, and the second end of the first current limiting resistor is equivalently connected with the second end of the first current limiting resistor.
5. The standard source device of claim 4, wherein the voltage conversion circuit further comprises:
the first end of the second current limiting resistor is connected with the output port of the driving voltage;
the anode of the light-emitting diode is connected with the second end of the second current-limiting resistor, and the cathode of the light-emitting diode is equivalently connected with the second end.
6. The standard source device of claim 1, wherein the voltage reference circuit comprises:
the first end of the third current limiting resistor is connected with the output end of the voltage conversion circuit;
the negative electrode of the rectifying diode is connected with the second end of the third current limiting resistor;
the first end of the first voltage dividing resistor is connected with the second end of the third current limiting resistor, and the second end of the first voltage dividing resistor is connected with the negative electrode of the rectifier diode;
the first end of the second voltage dividing resistor is connected with the cathode of the rectifying diode, and the second end of the second voltage dividing resistor is connected with the anode of the rectifying diode;
the first end of the first voltage dividing resistor is also used for receiving a reference voltage;
the second end of the second voltage dividing resistor is used for being connected with a second equivalent;
the first end of the fourth current limiting resistor is connected with the first end of the first voltage dividing resistor;
the first end of the third voltage dividing resistor is connected with the second end of the fourth current limiting resistor, and the second end of the third voltage dividing resistor is used for outputting the standard voltage;
a fourth voltage dividing resistor, wherein the first end of the fourth voltage dividing resistor is connected with the second end of the third voltage dividing resistor, and the second end of the fourth voltage dividing resistor is equivalently connected with the second end of the fourth voltage dividing resistor;
the third voltage dividing resistor and the fourth voltage dividing resistor are used for dividing the reference voltage to obtain the standard voltage, and the standard voltage is output from the second end of the third voltage dividing resistor.
7. The standard source device of claim 6, wherein the voltage reference circuit further comprises:
the first end of the fifth filter capacitor is connected with the first end of the first voltage dividing resistor, and the second end of the fifth filter capacitor is connected with the second end of the second voltage dividing resistor;
and the first end of the sixth filter capacitor is used for receiving the reference voltage, and the second end of the sixth filter capacitor is equivalently connected with the second end of the sixth filter capacitor.
8. The standard source device of claim 1, wherein the voltage follower circuit comprises:
the positive input end of the rail-to-rail operational amplifier is connected with the output end of the voltage reference circuit, the power end of the rail-to-rail operational amplifier is connected with the output end of the voltage conversion circuit, the negative input end of the rail-to-rail operational amplifier is connected with the output end of the rail-to-rail operational amplifier, and the output end of the rail-to-rail operational amplifier is used for outputting the target voltage.
9. The standard source device of claim 8, wherein the voltage follower circuit further comprises:
a seventh current limiting resistor connected in series between the positive input of the rail-to-rail operational amplifier and the output of the voltage reference circuit;
a seventh filter capacitor, wherein a first end of the seventh filter capacitor is connected with a power end of the rail-to-rail operational amplifier, and a second end of the seventh filter capacitor is equivalently connected with a second end of the seventh filter capacitor;
an eighth current limiting resistor connected in series between the output of the rail-to-rail operational amplifier and the output port of the target voltage;
and the first end of the eighth filter capacitor is connected with the output port of the target voltage, and the second end of the eighth filter capacitor is equivalently connected with the second end of the eighth filter capacitor.
10. The standard source device of claim 1, wherein the standard voltage has a magnitude equal to the magnitude of the target voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223577085.9U CN219247695U (en) | 2022-12-30 | 2022-12-30 | Standard source device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223577085.9U CN219247695U (en) | 2022-12-30 | 2022-12-30 | Standard source device |
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| CN219247695U true CN219247695U (en) | 2023-06-23 |
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| CN202223577085.9U Active CN219247695U (en) | 2022-12-30 | 2022-12-30 | Standard source device |
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