CN213399339U - High-precision direct-current voltage source - Google Patents
High-precision direct-current voltage source Download PDFInfo
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- CN213399339U CN213399339U CN202021961823.8U CN202021961823U CN213399339U CN 213399339 U CN213399339 U CN 213399339U CN 202021961823 U CN202021961823 U CN 202021961823U CN 213399339 U CN213399339 U CN 213399339U
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Abstract
The utility model provides a high accuracy direct current voltage source, including accurate steady voltage control circuit, accurate steady voltage control circuit including the low-voltage control circuit who has feedback input, reference input and control output, the reference input connect in reference circuit, the control output pass through isolation circuit and connect in the high pressure that has high-pressure input and accurate output and be controlled the circuit, accurate output be connected with the sampling return circuit, the output in sampling return circuit connect in the feedback input. The utility model can provide high-precision and high-stability high-voltage direct-current voltage source, and improve the calibration precision of the high-precision electric energy meter; the temperature drift coefficient is extremely low in a common temperature range, the requirement on the use environment is not harsh, and the method is suitable for more use scenes; the voltage can be adjusted in a wide range, and stable output voltage can be provided under each output voltage.
Description
Technical Field
The utility model belongs to the technical field of the voltage source, especially, relate to a high accuracy direct current voltage source.
Background
With the development of integrated circuits, computer science technologies and emerging meter technologies, the field of electric meters has changed greatly, and the electric energy meter technology has also developed to a great extent. From an electrician type electric energy meter calibration device to an electronic type program control type electric energy meter calibration device and an intelligent type electric energy meter calibration device which appear later, the electric energy meter calibration modes are more and more, the meter calibration precision is higher and more, the influence of human factors on calibration is reduced, meanwhile, data can be effectively processed, transmitted and displayed, and the efficiency of energy meter calibration is improved to a great extent.
In order to ensure high meter calibration precision, expensive meter calibration equipment needs to be used, the investment on the equipment in the production process of the electric energy meter is increased, and the product cost is indirectly increased. Through years of research, the applicant finds that a voltage source capable of providing a voltage with high enough stability is crucial in the meter calibration process, and even the source can greatly reduce the requirement on meter calibration equipment and the requirement on expensive equipment, so that the investment on equipment in the production process is reduced, and the cost of products is indirectly reduced. The voltage source in the prior art generally has the problems of over-high temperature drift coefficient, unstable output voltage, complex circuit structure, harsh requirements on the use environment and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide a high accuracy direct current voltage source.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides a high accuracy direct current voltage source, includes accurate steady voltage control circuit, accurate steady voltage control circuit including the low-voltage control circuit who has feedback input, reference input and control output, reference input connect in reference circuit, the control output connect in the high pressure that has high-voltage input and accurate output and be controlled the circuit through isolation circuit, accurate output be connected with the sampling return circuit, the output in sampling return circuit connect in feedback input, isolation circuit including the isolation opto-coupler that has luminescent device and photosensitive semiconductor, low-voltage control circuit and high pressure are controlled the circuit and are supplied power by low-voltage power supply circuit power supply and high-voltage power supply circuit respectively.
In the high-precision direct current voltage source, the low-voltage control circuit comprises an operational amplifier, the output end of the operational amplifier is connected to the light-emitting device of the isolation optocoupler, and two ends of the photosensitive semiconductor are respectively connected to the high-voltage input end and the precision output end.
In the high-precision direct-current voltage source, the input end of the photosensitive semiconductor is connected to the high-voltage input end through a resistor R8, a resistor R2 and a resistor R1, the output end of the photosensitive semiconductor is simultaneously connected to the anode of a diode D1, the base of a triode Q1 and one end of a resistor R14, the cathode of a diode D1 is connected between a resistor R8 and a resistor R2, one end of a resistor R14, which is far away from the photosensitive semiconductor, is connected to the precise output end, the collector of the triode Q1 is connected to the cathode of a diode D1, and the emitter is connected to the precise output end through a resistor R16;
the resistor R1 is a current-limiting resistor;
the sampling loop is connected to one end of the resistor R14 close to the accurate output end.
In the high-precision direct current voltage source, the precision output end is connected to the isolation circuit through the filter circuit, and the sampling loop is connected to one end of the filter circuit, which is far away from the precision output end.
In the above high-precision dc voltage source, the sampling loop includes a resistor R21, a resistor R53, and a resistor R45, one end of the resistor R21 is connected to the precise output terminal, the other end of the resistor R53 is connected to the resistor R53, one end of the resistor R53 far away from the resistor R21 is connected to the ground terminal, one end of the resistor R45 is connected to the common terminal of the resistor R21 and the resistor R53, the other end of the resistor R45 is connected to the feedback input terminal, and two ends of the resistor R45 are connected to the ground terminal through a capacitor C9 and a capacitor C10, respectively.
In the above-mentioned high-precision dc voltage source, the reference input terminal is connected to a switch U2 having at least two switching terminals, and the reference circuit is connected to the reference input terminal through one of the switching terminals, and the other switching terminal is connected to the reference voltage adjusting circuit.
In the above high-precision dc voltage source, the reference voltage adjusting circuit includes a DAC chip, an input terminal of the DAC chip is connected to the reference circuit, a reference output terminal of the DAC chip is connected to one switching terminal of the switch U2, and a control terminal of the DAC chip is connected to the main control chip.
In the high-precision dc voltage source, the input terminal of the DAC chip is connected to the reference circuit through a resistor R3, and the DAC chip is also connected to ground through a resistor R5.
In the high-precision direct-current voltage source, a sampling point VFB-a of the sampling loop is connected to a feedback adjusting circuit, and the feedback adjusting circuit is connected to a feedback adjusting control circuit.
In the high-precision direct-current voltage source, the feedback adjusting circuit comprises a plurality of voltage dividing circuits with conduction paths connected in parallel, each voltage dividing circuit comprises a voltage dividing resistor and a switching tube which are connected in series, a control electrode of the switching tube is connected to the feedback adjusting control circuit, and a common point of the voltage dividing circuits is connected to the sampling point VFB-a;
the feedback regulation control circuit comprises a dial switch U3 with a plurality of selection paths, and the control electrode of each switch tube is connected with one selection path;
or, the feedback adjustment control circuit comprises a main control chip, and the control electrode of each switching tube is respectively connected to eight IO ends of the main control chip.
The utility model has the advantages that: the high-voltage direct-current voltage source with high precision and high stability can be provided, and the calibration precision of the high-precision electric energy meter is improved; the temperature drift coefficient is extremely low in a common temperature range, the requirement on the use environment is not harsh, and the method is suitable for more use scenes; the voltage can be adjusted in a wide range, and stable output voltage can be provided under each output voltage.
Drawings
Fig. 1 is a block diagram of the circuit structure of the high-precision dc voltage source of the present invention;
fig. 2 is a high voltage power supply circuit diagram of the high precision dc voltage source of the present invention;
fig. 3 is a low voltage power supply circuit diagram of the high precision dc voltage source of the present invention;
fig. 4 is a reference circuit diagram of the high-precision dc voltage source of the present invention;
fig. 5 is a circuit diagram of the reference voltage adjusting circuit of the high-precision dc voltage source of the present invention;
fig. 6 is a circuit diagram of the accurate voltage stabilization control circuit of the high-precision dc voltage source of the present invention;
fig. 7 is a circuit diagram of the feedback adjustment of the high-precision dc voltage source of the present invention;
fig. 8 is a circuit diagram of the feedback adjustment control of the high-precision dc voltage source of the present invention;
fig. 9 is a graph of the output voltage stability experiment result of the high-precision dc voltage source of the present invention in the common temperature range;
fig. 10 is a temperature profile of the high-precision dc voltage source of the present invention at a voltage of 23.9V;
fig. 11 is a temperature profile of the high-precision dc voltage source of the present invention at 106.56V;
fig. 12 is a temperature profile of the high-precision dc voltage source of the present invention at 222.8V.
Reference numerals: a precise voltage stabilization control circuit 1; a low-voltage control circuit 11; a high-voltage controlled circuit 12; a sampling loop 13; an isolation circuit 14; a reference circuit 2; a reference voltage adjusting circuit 3; a feedback adjustment circuit 4; a feedback adjustment control circuit 5; a high-voltage power supply circuit 6; a low voltage supply circuit 7.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiment discloses a high-precision direct-current voltage source, which uses a high-precision reference source as a voltage reference, mainly controls the output of a high-voltage circuit by a low-voltage circuit in an optical coupling isolation driving mode, obtains a feedback voltage through a sampling loop, compares the feedback voltage with a reference voltage, and compensates to obtain the high-precision and high-stability direct-current voltage source. In addition, the output voltage is adjusted by adopting the feedback adjusting circuit and the reference voltage adjusting circuit, so that the voltage in a larger range can be adjusted.
As shown in fig. 1-8, the specific scheme is as follows:
the high-precision direct-current voltage source of the embodiment comprises a high-voltage power supply circuit 6, a low-voltage power supply circuit 7, a precise voltage stabilization control circuit 1, a reference circuit 2, a reference voltage adjusting circuit 3, a feedback adjusting circuit 4 and a feedback adjusting control circuit 5.
As shown in fig. 2, the high voltage power supply circuit 6 is used to provide a power supply for the high voltage end of the accurate voltage regulation control circuit 1, i.e. to provide power for the system output voltage, here 311V. The capacitor C20, the resistor R35 and the resistor R36 in fig. 2 are current limiting circuits, and can be protected in case of a subsequent circuit failure. The BD2 is a rectifier bridge and can convert 220V alternating current into 311V direct current, and the inductor L1, the capacitor C12, the capacitor C16, the capacitor C17, the capacitor C18, the capacitor C21, the resistor R38, the resistor R40, the resistor R43 and the resistor R44 are low-frequency filter circuits and have the function of providing primary stable voltage.
As shown in fig. 3, the low voltage supply circuit 7 is a circuit that generates a voltage of 12V for supplying the operating voltage to the reference circuit 2 and the accurate voltage stabilization control circuit 1. The BD1 is a rectifier bridge and can rectify 12v alternating current into direct current, and the inductor L2, the capacitor C13, the capacitor C14 and the resistor R39 jointly form a low-frequency filter network, so that subsequent power supply voltage is stabilized, and power supply ripples can be reduced. The IC3 is a 12V three-terminal voltage stabilization chip, and the IC3, the capacitor C19, the capacitor C15 and the capacitor C23 form a 12V power supply circuit.
As shown in fig. 4, the reference circuit 2 is used to provide a high stability 6.95V voltage, where 6.95V is the voltage generated by the reference voltage device IC2, and other voltages can be obtained by replacing IC2 with other devices. The reference circuit 2 supplies a reference voltage to the output of the precise voltage stabilization control circuit 1.
As shown in FIG. 5, the reference voltage adjusting circuit 3 is a circuit for converting the 6.95V voltage generated by the reference circuit 2 into 0-3.475V voltage. The further large-range accurate control of the power supply output voltage is facilitated. The IC4, the capacitor C5, the capacitor C24, the capacitor C25 and the capacitor C26 are circuits for converting 12V to 5V, and are mainly used for supplying power to the high-precision DAC chip IC 5. IC5, resistance R3, resistance R5 are DAC converting circuit, can carry out accurate adjustment to 6.95V reference power supply, output the adjustable voltage of 0 ~ 3.475V, can change wantonly in this scope, and the precision is 12 bits. The input end of the high-precision DAC chip IC5 is connected to the reference circuit 2 through a resistor R3, and is connected to the ground end through a resistor R5; the reference output end of the high-precision DAC chip IC5 is connected to the reference input end of the precise voltage stabilization control circuit 1 through the change-over switch U2 and the reference circuit 2, and a fixed 6.95V voltage source or an adjustable voltage source of 0-3.475V is freely selected through the change-over switch U2; the control ends DAC-DIN, DAC-SCLK and DAC-SYNC of the high-precision DAC chip IC5 are connected to the main control chip, and the main control chip controls the high-precision DAC chip IC5 to change an output value so as to adjust the output reference voltage (0-3.475V) of the high-precision DAC chip IC5 and further adjust the output voltage of the whole circuit. For example, assuming that the output voltage of the accurate voltage regulation control circuit 1 is 200V at this time, a 300V voltage is desired, and the voltage at the point V3.475-0 in fig. 5 is 2V at this time, a 300V output voltage can be obtained by adjusting the IC5 to output a 3V voltage. A wider range of voltage regulation is achieved.
As shown in fig. 6, the precise voltage stabilization control circuit 1 includes a low voltage control circuit 11 having a feedback input terminal, a reference input terminal and a control output terminal, wherein the reference input terminal is connected to a switch U2 having at least two switching terminals, the reference circuit 2 is connected to the reference input terminal through one of the switching terminals, and the other switching terminal is connected to the reference voltage adjusting circuit 3; the control output end is connected to a high-voltage controlled circuit 12 with a high-voltage input end and an accurate output end through an isolation circuit 14, the accurate output end is connected with a sampling loop 13, and the output end of the sampling loop 13 is connected to the feedback input end.
The accurate voltage stabilization control circuit 1 is a circuit for accurately stabilizing a stabilized voltage of about 311V, and can accurately control an output voltage at a preset voltage point, such as 250V, 200V, 150V, and the like, wherein the voltage accuracy can reach 0.005%, and the temperature drift is as low as 5 ppm. The IC1 is a high-precision operational amplifier, the voltage of the feedback part is compared with the 6.95V voltage generated by the reference circuit or the 0-3.475V adjustable voltage generated by the reference voltage adjusting circuit, the voltage is output to the isolation optocoupler 14 through the resistor R9 and the resistor R11, and the isolation optocoupler 14 is a device for connecting the low-voltage part and the high-voltage part, so that the whole circuit is simplified, and the reliability is improved. U2 is a change-over switch, can freely select fixed 6.95V and can be at the adjustable voltage source of 0 ~ 3.475V adjustment. The output circuit is an execution part of output voltage, and is composed of U1, R1, R2, R8, R14, R16, D1, Q1 and the like, wherein the resistor R1 plays a role of current limiting, and when the current is more than 20mA, the resistor R1 enters a high-resistance state, so that the circuit is disconnected, and the safety of equipment and personnel is protected. R21, R45, R53, C9 and C10 form a feedback loop, and output voltage is transmitted to IC1 to be processed, so that the effect of stabilizing output voltage is achieved. The output filter circuit is composed of C6, C11, C7, C8 and R29, and contributes to the stability of the output voltage.
As shown in fig. 7, the feedback adjusting circuit 4 is a circuit for directly adjusting the feedback loop, and is connected to the sampling point VFB-a of the sampling loop, so that the voltage adjustment scale is subdivided, and the voltage precision is effectively improved. The voltage dividing circuit specifically comprises a plurality of voltage dividing circuits with conduction paths connected in parallel, as shown in fig. 7, each voltage dividing circuit comprises a voltage dividing resistor R6, R7, R13, R15, R17, R19 and a switching tube-MOS tube Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9 which are connected in series, the gate of each MOS tube is respectively connected to the feedback adjustment control circuit 5, the drain of each MOS tube is connected to the sampling point VFB-a through a corresponding resistor, and the source is connected to the ground. Eight groups of adjusting circuits are formed by eight voltage dividing circuits in fig. 7, and 256 collocation schemes can be obtained by permutation and combination, and the feedback adjusting control circuit 5 controls the combination mode of the feedback adjusting circuit 4.
As shown in fig. 8, the feedback adjustment control circuit 5 may use a toggle switch U3 having a plurality of selection paths, wherein the gate of each MOS transistor is connected to one selection path, as shown in fig. 7, the gates a-H of the first to eighth MOS transistors are respectively connected to the corresponding positions a-H of eight selection paths, and the toggle switch U3 obtains 256 arrangements by eight selection and single switches: such as 00000000, 00000001, 00000010, 00000011, 00000100, 00000101 … … 11111111. If the switch at point a is closed, the MOGQ2 is turned on, which is equivalent to adjusting the resistance of the feedback loop, thereby changing the divided voltage at point VFB-a, and further changing the output voltage at the OUT terminal of the high-voltage controlled circuit 12.
The mode of the dial switch is adopted, when the device is put into use, the device can also be controlled by using the main control chip, the grid electrode of each MOS tube is respectively connected with eight IO ports of the main control chip, and other devices capable of applying voltage to each MOS tube can also be adopted.
The high-precision direct current voltage source provided by the utility model can realize high stability and high precision,
the high-precision direct current voltage source provided by the scheme simplifies the circuit of the product by adopting a low-voltage control high-voltage mode through optical coupling isolation, improves the reliability, and realizes the technical effects of lower cost, better output performance, more stable control output and the like by using a shorter feedback loop and more stably transferred test voltage;
in addition, the high-precision direct-current voltage source has an extremely low temperature coefficient in a normal temperature range, is not harsh on the requirements of the use environment, and has stronger anti-interference performance and more applicable scenes. As can be seen in fig. 9 in particular, this scheme exhibits excellent stability in the range of-12 ℃ to 70 ℃.
In addition, the scheme of reference voltage and feedback circuit male adjustment is adopted, so that the adjustable range is greatly widened, the requirement on a single device is lowered, the requirement and the use of expensive devices are reduced, and the cost and the performance are both achieved. Fig. 10, 11, and 12 are graphs showing results of voltage stability experiments at random points.
The specific embodiments described herein are merely illustrative of the spirit of the invention. The connection of the present invention includes direct connection and indirect connection. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the precise voltage regulation control circuit 1 is used more herein; a low-voltage control circuit 11; a high-voltage controlled circuit 12; a sampling loop 13; an isolation circuit 14; a reference circuit 2; a reference voltage adjusting circuit 3; a feedback adjustment circuit 4; a feedback adjustment control circuit 5; a high-voltage power supply circuit 6; low voltage supply circuit 7, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. A high-precision direct-current voltage source is characterized by comprising a precise voltage-stabilizing control circuit (1), the precise voltage stabilization control circuit (1) comprises a low-voltage control circuit (11) with a feedback input end, a reference input end and a control output end, the reference input end is connected with a reference circuit (2), the control output end is connected with a high-voltage controlled circuit (12) with a high-voltage input end and an accurate output end through an isolation circuit (14), the accurate output end is connected with a sampling loop (13), the output end of the sampling loop (13) is connected with the feedback input end, the isolation circuit (14) comprises an isolation optocoupler with a light emitting device and a photosensitive semiconductor, and the low-voltage control circuit (11) and the high-voltage controlled circuit (12) are respectively supplied with power by the low-voltage power supply circuit (7) and the high-voltage power supply circuit (6).
2. A high accuracy dc voltage source according to claim 1, wherein the low voltage control circuit (11) comprises an operational amplifier, the output terminal of the operational amplifier is connected to the light emitting device of the isolation optocoupler, and the two terminals of the photosensitive semiconductor are connected to the high voltage input terminal and the accurate output terminal, respectively.
3. The high-precision direct-current voltage source according to claim 2, wherein the input terminal of the photosensitive semiconductor is connected to the high-voltage input terminal through a resistor R8, a resistor R2 and a resistor R1, the output terminal of the photosensitive semiconductor is simultaneously connected to the anode of a diode D1, the base of a transistor Q1 and one end of a resistor R14, the cathode of a diode D1 is connected between the resistor R8 and the resistor R2, the end of the resistor R14 away from the photosensitive semiconductor is connected to the precision output terminal, the collector of the transistor Q1 is connected to the cathode of a diode D1, and the emitter is connected to the precision output terminal through a resistor R16;
the resistor R1 is a current-limiting resistor;
the sampling loop (13) is connected to one end of the resistor R14 close to the accurate output end.
4. A source of high accuracy dc voltage according to claim 1, characterized in that the accurate output is connected to the isolation circuit (14) via a filter circuit, and the sampling loop (13) is connected to the filter circuit at the end remote from the accurate output.
5. The high-precision direct-current voltage source according to claim 1, wherein the sampling loop (13) comprises a resistor R21, a resistor R53 and a resistor R45, one end of the resistor R21 is connected to the accurate output end, the other end of the resistor R21 is connected to the resistor R53, one end of the resistor R53 far away from the resistor R21 is connected to the ground, one end of the resistor R45 is connected to the common end of the resistor R21 and the resistor R53, the other end of the resistor R45 is connected to the feedback input end, and two ends of the resistor R45 are connected to the ground through a capacitor C9 and a capacitor C10, respectively.
6. A high accuracy dc voltage source according to claim 1, wherein the reference input terminal is connected to a switch U2 having at least two switching terminals, and the reference circuit (2) is connected to the reference input terminal through one of the switching terminals, and the other switching terminal is connected to the reference voltage adjusting circuit (3).
7. A high accuracy DC voltage source according to claim 6, characterized in that the reference voltage adjusting circuit (3) comprises a DAC chip, the input terminal of the DAC chip is connected to the reference circuit (2), the reference output terminal of the DAC chip is connected to a switching terminal of a switch U2, and the control terminal of the DAC chip is connected to the main control chip.
8. A high accuracy DC voltage source according to claim 7, characterized in that the input terminal of the DAC chip is connected to the reference circuit (2) through a resistor R3, and the DAC chip is connected to ground through a resistor R5.
9. A high accuracy dc voltage source according to claim 1, wherein the sampling point VFB-a of the sampling loop (13) is connected to a feedback regulation circuit (4), and the feedback regulation circuit (4) is connected to a feedback regulation control circuit (5).
10. The high-precision direct-current voltage source according to claim 9, wherein the feedback regulation circuit (4) comprises a plurality of voltage division circuits with conduction paths connected in parallel, each voltage division circuit comprises a voltage division resistor and a switching tube connected in series, a control electrode of the switching tube is connected to the feedback regulation control circuit (5), and a common point of the plurality of voltage division circuits is connected to the sampling point VFB-a;
the feedback regulation control circuit (5) comprises a dial switch U3 with a plurality of selection paths, and the control electrode of each switch tube is connected with one selection path;
or the feedback adjustment control circuit (5) comprises a main control chip, and the control electrode of each switching tube is respectively connected to eight IO ends of the main control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021961823.8U CN213399339U (en) | 2020-09-09 | 2020-09-09 | High-precision direct-current voltage source |
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| CN202021961823.8U CN213399339U (en) | 2020-09-09 | 2020-09-09 | High-precision direct-current voltage source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147564A (en) * | 2020-09-09 | 2020-12-29 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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2020
- 2020-09-09 CN CN202021961823.8U patent/CN213399339U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147564A (en) * | 2020-09-09 | 2020-12-29 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| CN112147564B (en) * | 2020-09-09 | 2023-11-10 | 浙江永泰隆电子股份有限公司 | High-precision direct-current voltage source |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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