CN213243810U - Efficient harmonic filtering circuit - Google Patents
Efficient harmonic filtering circuit Download PDFInfo
- Publication number
- CN213243810U CN213243810U CN202022407857.9U CN202022407857U CN213243810U CN 213243810 U CN213243810 U CN 213243810U CN 202022407857 U CN202022407857 U CN 202022407857U CN 213243810 U CN213243810 U CN 213243810U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- common mode
- pin
- node
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses a high-efficiency harmonic filtering circuit, which comprises an input protection circuit, a common mode interference filtering circuit, a rectifying circuit and a harmonic current interference reducing circuit which are electrically connected in sequence, the circuit for reducing harmonic current interference is provided with a plurality of power resistors, the input protection circuit of the technical scheme clamps the input voltage to a relatively fixed voltage value, thereby realizing the protection of the post-stage circuit, the common mode interference filtering circuit plays the role of EMI filtering, used for inhibiting the generated electromagnetic wave from radiating and emitting outwards, the rectifying circuit plays a role of rectification, outputs stable direct current, reduces harmonic current interference by the harmonic current interference circuit, compared with the prior art, the power resistor of the technical scheme can effectively reduce harmonic current interference of a power grid, so that the product regulation requirements are met, and meanwhile, the circuit is simple and the cost is optimal.
Description
Technical Field
The utility model relates to a harmonic filtering circuit, especially an efficient harmonic filtering circuit.
Background
When the power of a power adapter product is larger than 75W, the product needs to be subjected to current harmonic test evaluation, the conventional method is to add a PFC power factor correction circuit to solve the problem, and the defects are high cost and complex circuit.
Disclosure of Invention
In order to overcome the not enough of prior art, the utility model provides an efficient harmonic filtering circuit.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides an efficient harmonic filtering circuit, includes electric connection's input protection circuit, common mode interference filtering circuit, rectifier circuit and reduction harmonic current interference circuit in proper order, it is provided with a plurality of power resistance to reduce harmonic current interference circuit.
Input protection circuit includes fuse F1, piezo-resistor MOV1, thermistor NTC1 and electric capacity CX1, fuse F1's one end line L that connects, another termination of fuse F1 the positive input end of common mode interference filtering circuit, zero line N pass through thermistor NTC1 connects the negative pole input end of common mode interference filtering circuit, the one end of piezo-resistor MOV1 and an end of electric capacity CX1 connect the node between the other end of fuse F1 and the positive pole input end of common mode interference filtering circuit, another termination of piezo-resistor MOV1 the node between zero line N and the thermistor NTC1, another termination of electric capacity CX1 the node between the negative pole input end of thermistor NTC1 and common mode interference filtering circuit.
The common-mode interference filtering circuit comprises a resistor RX1, a resistor RX2, a resistor RX3, a resistor RX4 and a common-mode inductor LF1, wherein a pin 1 of the common-mode inductor LF1 is connected with a node between the other end of the fuse F1 and one end of a capacitor CX1, a pin 2 of the common-mode inductor LF1 is connected with one input end of the rectifying circuit, a pin 3 of the common-mode inductor LF1 is connected with a node between the other end of the capacitor CX1 and a thermistor NTC1, a pin 4 of the common-mode inductor LF1 is connected with the other end of the rectifying circuit, a node between a pin 1 of the common-mode inductor LF1 and the other end of the fuse F1 is connected with a node between a pin 3 of the thermistor NTC1 and a pin 3 of the common-mode inductor NTC1 sequentially through the resistor RX1 and the resistor RX2, a node between a pin 1 of the common-mode inductor LF1 and the other end of the fuse F1 is connected with a node between the thermistor RX 86 1 and the LF 36 4, the node between the resistor RX1 and the resistor RX2 is connected with the node between the resistor RX3 and the resistor RX 4.
The rectifying circuit comprises a rectifying bridge BD1, one input end of the rectifying bridge BD1 is connected with 2 pins of the common-mode inductor LF1, the other input end of the rectifying bridge BD1 is connected with 4 pins of the common-mode inductor LF1, the positive output end of the rectifying bridge BD1 is connected with the positive input end of the harmonic current interference reducing circuit, and the negative output end of the rectifying bridge BD1 is connected with the negative input end of the harmonic current interference reducing circuit.
Reduce harmonic current interference circuit includes power resistance R1, power resistance R2, electric capacity EC1 and PWM transform module, electric capacity EC 1's one end is divided two the tunnel, connect all the way 1 pin of PWM transform module, another way loops through power resistance R1 and power resistance R2 connect rectifier bridge BD 1's positive pole output, electric capacity EC 1's the other end is divided two the tunnel, connect all the way 2 pins of PWM transform module, another way connects rectifier bridge BD 1's negative pole output, 3 pins of PWM transform module are as harmonic filtering circuit's positive pole output, 3 pins of PWM transform module are as harmonic filtering circuit's negative pole output.
The utility model has the advantages that: the utility model discloses an input protection circuit clamps input voltage to a relatively fixed voltage value to the realization is to the protection of back stage circuit, and common mode interference filtering circuit performance EMI filtering's effect is used for restraining the electromagnetic wave external radiation emission that produces, and rectifier circuit performance rectification's effect, the stable direct current of output reduces harmonic current interference of harmonic current interference circuit, compares with prior art, the utility model discloses a power resistance can effectively reduce the harmonic current interference of electric wire netting to satisfy the product regulation demand, the circuit is simple simultaneously, the cost is optimal.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a block diagram of the system of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
Referring to fig. 1 and 2, an efficient harmonic filtering circuit includes an input protection circuit, a common mode interference filtering circuit, a rectification circuit and a harmonic current interference reducing circuit, which are electrically connected in sequence, wherein the harmonic current interference reducing circuit is provided with a plurality of power resistors.
The input protection circuit of the technical scheme clamps the input voltage to a relatively fixed voltage value, thereby realizing the protection of a rear-stage circuit, the common-mode interference filtering circuit plays a role in EMI filtering and is used for inhibiting the generated electromagnetic waves from radiating and emitting outwards, the rectifying circuit plays a role in rectification, stable direct current is output, the harmonic current interference circuit is reduced, and the harmonic current interference is reduced.
Input protection circuit includes fuse F1, piezo-resistor MOV1, thermistor NTC1 and electric capacity CX1, fuse F1's one end line L that connects, another termination of fuse F1 the positive input end of common mode interference filtering circuit, zero line N pass through thermistor NTC1 connects the negative pole input end of common mode interference filtering circuit, the one end of piezo-resistor MOV1 and an end of electric capacity CX1 connect the node between the other end of fuse F1 and the positive pole input end of common mode interference filtering circuit, another termination of piezo-resistor MOV1 the node between zero line N and the thermistor NTC1, another termination of electric capacity CX1 the node between the negative pole input end of thermistor NTC1 and common mode interference filtering circuit.
The voltage dependent resistor MOV1 is a voltage limiting type protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when an overvoltage appears between two electrodes of the voltage dependent resistor, the voltage can be clamped to a relatively fixed voltage value, so that the protection of a post-stage circuit is realized.
When the current is too large, the thermistor NTC1 rapidly heats up, and the fuse F1 fuses, so that the whole circuit is in a short-circuit state, and the effect of protecting the circuit is achieved.
The common-mode interference filtering circuit comprises a resistor RX1, a resistor RX2, a resistor RX3, a resistor RX4 and a common-mode inductor LF1, wherein a pin 1 of the common-mode inductor LF1 is connected with a node between the other end of the fuse F1 and one end of a capacitor CX1, a pin 2 of the common-mode inductor LF1 is connected with one input end of the rectifying circuit, a pin 3 of the common-mode inductor LF1 is connected with a node between the other end of the capacitor CX1 and a thermistor NTC1, a pin 4 of the common-mode inductor LF1 is connected with the other end of the rectifying circuit, a node between a pin 1 of the common-mode inductor LF1 and the other end of the fuse F1 is connected with a node between a pin 3 of the thermistor NTC1 and a pin 3 of the common-mode inductor NTC1 sequentially through the resistor RX1 and the resistor RX2, a node between a pin 1 of the common-mode inductor LF1 and the other end of the fuse F1 is connected with a node between the thermistor RX 86 1 and the LF 36 4, the node between the resistor RX1 and the resistor RX2 is connected with the node between the resistor RX3 and the resistor RX 4.
The common mode inductor LF1 functions as an EMI filter for suppressing the electromagnetic waves generated by the high speed signal lines from being radiated outward.
The rectifying circuit comprises a rectifying bridge BD1, one input end of the rectifying bridge BD1 is connected with 2 pins of the common-mode inductor LF1, the other input end of the rectifying bridge BD1 is connected with 4 pins of the common-mode inductor LF1, the positive output end of the rectifying bridge BD1 is connected with the positive input end of the harmonic current interference reducing circuit, and the negative output end of the rectifying bridge BD1 is connected with the negative input end of the harmonic current interference reducing circuit.
The rectifier bridge BD1 is composed of four diodes, and outputs stable direct current after being rectified by the rectifier bridge BD1, so that the safety of a circuit and an electric appliance is protected.
Reduce harmonic current interference circuit includes power resistance R1, power resistance R2, electric capacity EC1 and PWM transform module, electric capacity EC 1's one end is divided two the tunnel, connect all the way 1 pin of PWM transform module, another way loops through power resistance R1 and power resistance R2 connect rectifier bridge BD 1's positive pole output, electric capacity EC 1's the other end is divided two the tunnel, connect all the way 2 pins of PWM transform module, another way connects rectifier bridge BD 1's negative pole output, 3 pins of PWM transform module are as harmonic filtering circuit's positive pole output, 3 pins of PWM transform module are as harmonic filtering circuit's negative pole output.
The power resistor R1, the power resistor R2 and the PWM conversion module have the function of filtering harmonic waves.
The PWM conversion module belongs to the prior art, and the model can select one from the prior art.
After the power resistor R1 and the power resistor R2 select proper parameters, harmonic current interference of a power grid can be effectively reduced, so that the requirements of product regulations are met, and meanwhile, the circuit is simple and the cost is optimal.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (5)
1. The utility model provides an efficient harmonic filtering circuit which characterized in that includes input protection circuit, common mode interference filtering circuit, rectifier circuit and the reduction harmonic current interference circuit of electric connection in proper order, it is provided with a plurality of power resistance to reduce harmonic current interference circuit.
2. The efficient harmonic filtering circuit according to claim 1, wherein the input protection circuit comprises a fuse F1, a varistor MOV1, a thermistor NTC1 and a capacitor CX1, one end of the fuse F1 is connected to the live line L, the other end of the fuse F1 is connected to the positive input end of the common mode interference filtering circuit, the neutral line N is connected to the negative input end of the common mode interference filtering circuit through the thermistor NTC1, one end of the varistor MOV1 and one end of the capacitor CX1 are connected to the node between the other end of the fuse F1 and the positive input end of the common mode interference filtering circuit, the other end of the varistor MOV1 is connected to the node between the neutral line N and the thermistor NTC1, and the other end of the capacitor CX1 is connected to the node between the thermistor NTC1 and the negative input end of the common mode interference filtering circuit.
3. The efficient harmonic filtering circuit according to claim 2, wherein the common mode interference filtering circuit comprises a resistor RX1, a resistor RX2, a resistor RX3, a resistor RX4 and a common mode inductor LF1, wherein pin 1 of the common mode inductor LF1 is connected to a node between the other end of the fuse F1 and one end of a capacitor CX1, pin 2 of the common mode inductor LF1 is connected to one input terminal of the rectifying circuit, pin 3 of the common mode inductor LF1 is connected to a node between the other end of the capacitor CX1 and a thermistor NTC1, pin 4 of the common mode inductor LF1 is connected to the other input terminal of the rectifying circuit, a node between pin 1 of the common mode inductor LF1 and the other end of the fuse F1 is connected to a node between the resistor RX1 and a resistor RX2 between the thermistor NTC1 and a pin 3 of the common mode inductor LF1, and a node between pin 1 of the common mode inductor LF1 and the other end of the fuse F1 is sequentially connected to the resistor RX3 and the thermistor 4 and the thermistor 868427 in turn And a node between 3 pins of the common mode inductor LF1, a node between the resistor RX1 and the resistor RX2 being connected to a node between the resistor RX3 and the resistor RX 4.
4. The efficient harmonic filtering circuit according to claim 3, wherein the rectifier circuit comprises a rectifier bridge BD1, one input terminal of the rectifier bridge BD1 is connected to the 2 pin of the common mode inductor LF1, the other input terminal of the rectifier bridge BD1 is connected to the 4 pin of the common mode inductor LF1, the positive output terminal of the rectifier bridge BD1 is connected to the positive input terminal of the harmonic current interference reduction circuit, and the negative output terminal of the rectifier bridge BD1 is connected to the negative input terminal of the harmonic current interference reduction circuit.
5. The efficient harmonic filtering circuit according to claim 4, wherein the circuit for reducing harmonic current interference includes a power resistor R1, a power resistor R2, a capacitor EC1 and a PWM conversion module, one end of the capacitor EC1 is divided into two paths, one path is connected to pin 1 of the PWM conversion module, the other path is connected to the positive output terminal of the rectifier bridge BD1 sequentially through the power resistor R1 and the power resistor R2, the other end of the capacitor EC1 is divided into two paths, one path is connected to pin 2 of the PWM conversion module, the other path is connected to the negative output terminal of the rectifier bridge BD1, pin 3 of the PWM conversion module serves as the positive output terminal of the harmonic filtering circuit, and pin 3 of the PWM conversion module serves as the negative output terminal of the harmonic filtering circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407857.9U CN213243810U (en) | 2020-10-26 | 2020-10-26 | Efficient harmonic filtering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022407857.9U CN213243810U (en) | 2020-10-26 | 2020-10-26 | Efficient harmonic filtering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213243810U true CN213243810U (en) | 2021-05-18 |
Family
ID=75880966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022407857.9U Active CN213243810U (en) | 2020-10-26 | 2020-10-26 | Efficient harmonic filtering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213243810U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123741A (en) * | 2021-11-12 | 2022-03-01 | 江西吉安奥海科技有限公司 | Harmonic suppression circuit of flyback power supply |
-
2020
- 2020-10-26 CN CN202022407857.9U patent/CN213243810U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123741A (en) * | 2021-11-12 | 2022-03-01 | 江西吉安奥海科技有限公司 | Harmonic suppression circuit of flyback power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204205552U (en) | The under-voltage over-voltage detection circuit of a kind of AC | |
| CN213243810U (en) | Efficient harmonic filtering circuit | |
| CN202076941U (en) | Power supply with lightning stroke protecting circuit | |
| CN104080221B (en) | A kind of LED drive circuit and LED light | |
| CN203086328U (en) | Intelligent power grid terminal power input surge suppression circuit | |
| CN216252552U (en) | Switching power supply circuit | |
| CN113381593B (en) | Front-end auxiliary circuit of high-power capacitive load instrument | |
| CN114400907A (en) | Radiation-resistant three-phase diode series dual-protection rectifying circuit | |
| CN213027803U (en) | Power supply circuit and power supply device | |
| CN203911564U (en) | An electric bus charging machine module | |
| CN215990558U (en) | Main chip protection circuit, control system and air conditioner | |
| CN219041622U (en) | Surge protection circuit is prevented to power | |
| CN213693212U (en) | Intelligent quick-charging circuit of lithium battery pack | |
| CN217388224U (en) | Low residual voltage high reliability lightning protection circuit | |
| CN216215893U (en) | Protection circuit | |
| CN219576858U (en) | Power module and electronic equipment | |
| CN212367144U (en) | Circuit with functions of preventing surge and reducing power consumption and switching power supply | |
| CN216437052U (en) | Switching power supply protection circuit | |
| CN220775660U (en) | Electric energy meter and power supply thereof | |
| CN215990205U (en) | Strong current filter circuit, control system and air conditioner | |
| CN216672851U (en) | Voltage stabilization output circuit | |
| CN213990249U (en) | 30KV ESD resistant charger power supply | |
| CN219802166U (en) | EC fan control drive circuit | |
| CN220915165U (en) | Isolated DCDC conversion power supply for fuel cell | |
| CN218648724U (en) | Safe and reliable power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An Efficient Harmonic Filtering Circuit Effective date of registration: 20230927 Granted publication date: 20210518 Pledgee: Shanghai Pudong Development Bank Limited by Share Ltd. Zhongshan branch Pledgor: ZHONGSHAN BAOLIJIN ELECTRONIC Co.,Ltd. Registration number: Y2023980059564 |