CN213243828U - Transformation unit based on power transmission system - Google Patents
Transformation unit based on power transmission system Download PDFInfo
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- CN213243828U CN213243828U CN202021664922.XU CN202021664922U CN213243828U CN 213243828 U CN213243828 U CN 213243828U CN 202021664922 U CN202021664922 U CN 202021664922U CN 213243828 U CN213243828 U CN 213243828U
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Abstract
The utility model relates to an electric power measurement technical field especially relates to a vary voltage unit based on power transmission system, include: the rectifying circuit is used for converting alternating current into direct current and outputting the direct current; the filter circuit is connected with the rectifying circuit and is used for filtering the direct current to form a filter signal; the voltage reduction circuit is used for receiving the filtering signal and reducing the voltage of the filtering signal to a preset signal for output; wherein, the step-down circuit includes: a first integrated device; a fourth diode, a forward end of which is grounded and a reverse end of which is connected to the source of the first integrated device; and the input end of the second inductor is connected with the source electrode of the first integrated device, and the output end of the second inductor is connected with the output end of the voltage transformation unit.
Description
Technical Field
The utility model relates to an electric power measurement technical field especially relates to a vary voltage unit based on power transmission system.
Background
In the internet era, more and more electronic products tend to be more functional and intelligent, and a socket with on-off timing power consumption measurement becomes standard configuration of intelligent equipment. Generally, in the product design for realizing the above functions, the device for measuring the electric energy generally comprises a voltage reduction unit, most of the existing voltage reduction units adopt a transformer for reducing the voltage, but the volume of the transformer is relatively large, so that the following problems generally exist in the integration process: firstly, the volume or area of the power is relatively large due to the volume of the transformer, especially, the layout of the circuit device is difficult to be compact, and meanwhile, the design of the product structure and appearance is inconvenient. In addition, the transformer is adopted for voltage reduction, the transformer in a working state and external noise are relatively large, the influence on voltage sampling and current sampling is large, the accuracy of sampling data is low, the voltage output based on the sampling data is usually in an unstable state, and the working precision of the metering device is reduced.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to solve the shortcoming that exists among the prior art, and the one that proposes is used for a vary voltage unit based on power transmission system.
The utility model provides a vary voltage unit based on power transmission system, wherein, include:
the rectifying circuit is used for converting alternating current into direct current and outputting the direct current;
the filter circuit is connected with the rectifying circuit and is used for filtering the direct current to form a filter signal;
the voltage reduction circuit is used for receiving the filtering signal and reducing the voltage of the filtering signal to a preset signal for output; wherein the content of the first and second substances,
the step-down circuit includes:
a first integrated device;
a fourth diode, a forward end of which is grounded and a reverse end of which is connected to the source of the first integrated device;
and the input end of the second inductor is connected with the source electrode of the first integrated device, and the output end of the second inductor is connected with the output end of the voltage transformation unit.
Preferably, the above voltage transformation unit based on the power transmission system further includes a feedback unit, and specifically includes:
one end of the first resistor is connected with the output end of the voltage transformation unit,
one end of the third resistor is connected with the output end of the voltage transformation unit, the other end of the third resistor is connected with the other end of the first resistor to form a feedback connecting end, and the feedback connecting end is connected with the feedback input end of the first integrated device.
Preferably, in the transformation unit based on the power transmission system, a resistance value of the first resistor is 5.6K Ω, and a resistance value of the third resistor is 4.99K Ω.
Preferably, in the above voltage transformation unit based on the power transmission system, the filter circuit is formed by a first inductor, a fourth capacitor, and a fifth capacitor, a positive terminal of the fourth capacitor is connected to one end of the first inductor, a negative terminal of the fourth capacitor is connected to a negative terminal of the fifth capacitor, and a positive terminal of the fifth capacitor is connected to the other end of the first inductor.
Preferably, in the above voltage transformation unit based on the power transmission system, a capacitance value of the fourth capacitor is 2.2uf, and a capacitance value of the fifth capacitor is 4.7 uf.
Preferably, in the above voltage transformation unit based on the power transmission system, a capacitance value of the fourth capacitor is 4.7uf, and a capacitance value of the fifth capacitor is 4.7 uf.
Preferably, the above voltage transformation unit based on the power transmission system further includes a fifth resistor, and the fifth resistor is disposed between the negative terminal of the fourth capacitor and the negative terminal of the fifth capacitor.
Preferably, the above voltage transformation unit based on the power transmission system further includes an electrostatic protection circuit, and the electrostatic protection circuit is connected to the power input end.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses in, form linear non-isolated AD step-down circuit through first integrated device, first integrated device size is less, and first integrated device's pin is also relatively less simultaneously, and peripheral circuit is simple. In addition, the current overload capacity of the first integrated device is strong, and the selection range of the internal resistance input into the first integrated device is wide. The PCB has larger layout space, the design of the power supply is greatly improved in size compared with the design of the isolated power supply, and convenience is brought to the reduction of the structural space.
Drawings
Fig. 1 is a circuit diagram of a voltage transformation unit based on a power transmission system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
As shown in fig. 1, the utility model provides a vary voltage unit based on power transmission system, wherein, include:
the rectifying circuit is used for converting alternating current into direct current and outputting the direct current; further, the rectifier circuit is formed by a diode, the reverse end of the diode is connected with the electric energy input end, the forward end of the diode is connected with the filter circuit, and the diode is single-side rectification. The front end of the diode further comprises an overload protection device.
The filter circuit is connected with the rectifying circuit and is used for filtering the direct current to form a filter signal; further, the filter circuit is formed by a first inductor, a fourth capacitor and a fifth capacitor, wherein the positive terminal of the fourth capacitor is connected with one end of the first inductor, the negative terminal of the fourth capacitor is connected with the negative terminal of the fifth capacitor, and the positive terminal of the fifth capacitor is connected with the other end of the first inductor.
Further, in the above voltage transformation unit based on the power transmission system, a capacitance value of the fourth capacitor is 4.7uf, and a capacitance value of the fifth capacitor is 4.7 uf. Under the condition that the capacitance values of the fourth capacitor and the fifth capacitor are the same, a symmetrical circuit based on the first inductor is formed, wherein the resistance value of the first inductor is 1 mH.
When the fourth capacitor is a capacitor of 4.7uf, the volume of the capacitor is large, and based on this, further, the voltage transformation unit based on the power transmission system is described above, wherein a capacitance value of the fourth capacitor is 2.2uf, and a capacitance value of the fifth capacitor is 4.7 uf. A small volume capacitance of 2.2uf is used to facilitate circuit layout.
The voltage reduction circuit is used for receiving the filtering signal and reducing the voltage of the filtering signal to a preset signal for output; wherein the content of the first and second substances,
the step-down circuit includes:
a first integrated device; the first integrated device may be formed from a chip. The first integrated device current overload capability reaches 350 ma.
A fourth diode, a forward end of which is grounded and a reverse end of which is connected to the source of the first integrated device;
and the input end of the second inductor is connected with the source electrode of the first integrated device, and the output end of the second inductor is connected with the output end of the voltage transformation unit.
The working principle of the utility model is that, 220V voltage passes through overload protection device and inputs to rectifier circuit, and rectifier circuit turns into 99V's direct current signal output with 220V's alternating voltage information, and direct current signal is through filter circuit and is filtered processing in order to form the stable direct current signal of voltage, is transmitted direct current signal to step-down circuit, and the inside component of step-down circuit is right to the PWM ripples that combines the inside formation of first integrated device with fourth diode, second inductance direct current signal step-down processing.
The utility model discloses in, form linear non-isolated AD step-down circuit through first integrated device, first integrated device size is less, and first integrated device's pin is also relatively less simultaneously, and peripheral circuit is simple. In addition, the current overload capacity of the first integrated device is strong, and the selection range of the internal resistance input into the first integrated device is wide. The PCB has larger layout space, the design of the power supply is greatly improved in size compared with the design of the isolated power supply, and convenience is brought to the reduction of the structural space.
As a further preferred embodiment, the above voltage transformation unit based on a power transmission system further includes a feedback unit, specifically including:
one end of the first resistor is connected with the output end of the voltage transformation unit,
one end of the third resistor is connected with the output end of the voltage transformation unit, the other end of the third resistor is connected with the other end of the first resistor to form a feedback connecting end, and the feedback connecting end is connected with the feedback input end of the first integrated device. And a third capacitor is connected between the feedback connection end and the source electrode, and the capacitance value of the third capacitor is 470 pf. In a simulation circuit, the third capacitor is not generally needed, but in actual use, the resistance of the first integrated device itself cannot be ignored, and in order to reduce the influence of the first integrated device itself on the circuit, the influence is eliminated by the third capacitor.
The resistance value of the first resistor is 5.6K omega, and the resistance value of the third resistor is 4.99K omega.
The capacitance value of the first capacitor is 220nf, one end of the first capacitor is connected with one end of the first resistor, the other end of the first capacitor is connected with one end of the third resistor, the first capacitor is connected with the first resistor and the third resistor in parallel to form an RC filter circuit, the value of the first capacitor is generally matched with the first resistor and the third resistor, and the first resistor and the third resistor are matched with the feedback connection end. The first capacitor is used for filtering the resistors at the two ends of the first resistor and the third resistor again so as to further filter the alternating current harmonic waves of the output voltage.
In use, the N terminal of the 220V voltage is connected to the ground terminal, which generates much noise. As a further preferred embodiment, the above-mentioned transformer unit based on a power transmission system further includes a fifth resistor, and the fifth resistor is disposed between the negative terminal of the fourth capacitor and the negative terminal of the fifth capacitor. The fifth resistor is a zero-ohm resistor, the electric energy stored in the fourth capacitor and the fifth capacitor can be rapidly released through the fifth resistor in the discharging process of the fourth capacitor and the fifth capacitor, and in addition, the N end is separated from the grounding end through the fifth resistor, so that the influence of noise on each functional circuit can be effectively reduced.
As a further preferred embodiment, the above-mentioned voltage transformation unit based on a power transmission system further includes an electrostatic protection circuit, and the electrostatic protection circuit is connected to the power input terminal.
The electrostatic protection circuit comprises an L-end electrostatic protection branch circuit and an N-end electrostatic protection branch circuit, wherein the L-end electrostatic protection branch circuit is formed by connecting a pair of diodes, one diode is connected between the L output end and the ground in parallel in the forward direction, the other diode is connected between the L output end and the ground in parallel in the reverse direction, four 510K omega resistors are arranged between the L output end and the diodes, and the four 510K omega resistors are used for carrying out voltage division processing on L voltage. When the static electricity of KV is input from the input end, the diode is broken down in the reverse direction, and meanwhile, the charges are discharged to the ground or the power supply rapidly. The positive static electricity is mostly discharged to the power source, and the negative static electricity is mostly discharged to the ground. The purposes of reducing signal noise and protecting the circuit are achieved.
Similarly, the N-terminal electrostatic protection branch at least includes an N-terminal electrostatic protection input branch and an N-terminal electrostatic protection output branch, and the N-terminal electrostatic protection input/output branch is formed by connecting a pair of diodes.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. A transformation unit based on a power transmission system, comprising:
the rectifying circuit is used for converting alternating current into direct current and outputting the direct current;
the filter circuit is connected with the rectifying circuit and is used for filtering the direct current to form a filter signal;
the voltage reduction circuit is used for receiving the filtering signal and reducing the voltage of the filtering signal to a preset signal for output; wherein the content of the first and second substances,
the step-down circuit includes:
a first integrated device;
a fourth diode, a forward end of which is grounded and a reverse end of which is connected to the source of the first integrated device;
and the input end of the second inductor is connected with the source electrode of the first integrated device, and the output end of the second inductor is connected with the output end of the voltage transformation unit.
2. The transformation unit based on the power transmission system according to claim 1, further comprising a feedback unit, specifically comprising:
one end of the first resistor is connected with the output end of the voltage transformation unit,
one end of the third resistor is connected with the output end of the voltage transformation unit, the other end of the third resistor is connected with the other end of the first resistor to form a feedback connecting end, and the feedback connecting end is connected with the feedback input end of the first integrated device.
3. The transformation unit based on the power transmission system as claimed in claim 2, wherein the resistance of the first resistor is 5.6K Ω, and the resistance of the third resistor is 4.99K Ω.
4. The power transmission system-based transformation unit according to claim 1, wherein the filter circuit is formed by a first inductor, a fourth capacitor and a fifth capacitor, a positive terminal of the fourth capacitor is connected to one end of the first inductor, a negative terminal of the fourth capacitor is connected to a negative terminal of the fifth capacitor, and a positive terminal of the fifth capacitor is connected to the other end of the first inductor.
5. The power transmission system-based voltage transformation unit according to claim 4, wherein the capacitance value of the fourth capacitor is 2.2uf, and the capacitance value of the fifth capacitor is 4.7 uf.
6. The power transmission system-based voltage transformation unit according to claim 4, wherein the capacitance value of the fourth capacitor is 4.7uf, and the capacitance value of the fifth capacitor is 4.7 uf.
7. The transformation unit based on the power transmission system according to claim 4, further comprising a fifth resistor, wherein the fifth resistor is disposed between the negative terminal of the fourth capacitor and the negative terminal of the fifth capacitor.
8. The transformation unit based on the power transmission system of claim 1, further comprising an electrostatic protection circuit, wherein the electrostatic protection circuit is connected to a power input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021664922.XU CN213243828U (en) | 2020-08-12 | 2020-08-12 | Transformation unit based on power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021664922.XU CN213243828U (en) | 2020-08-12 | 2020-08-12 | Transformation unit based on power transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213243828U true CN213243828U (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021664922.XU Active CN213243828U (en) | 2020-08-12 | 2020-08-12 | Transformation unit based on power transmission system |
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|---|---|
| CN (1) | CN213243828U (en) |
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2020
- 2020-08-12 CN CN202021664922.XU patent/CN213243828U/en active Active
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