Push-pull circuit with high harmonic suppression
By introducing Barron 1 and Barron 2 into the push-pull circuit to generate signals with opposite phases, and using amplifiers and π attenuators to optimize harmonic rejection, the impact of harmonics on the power system is solved, achieving efficient harmonic rejection and signal optimization.
Patent Information
- Application Number
- CN202422945521.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-12-02
AI Technical Summary
In the prior art, harmonics have a serious impact on the stability and reliability of the power system, resulting in problems such as signal distortion, increased power loss and threats to electrical equipment.
A harmonic suppression circuit including Barron 1 and Barron 2 is used to generate two signals with opposite phases, and optimize harmonic suppression using amplifiers and π attenuators, combining NPN and PNP transistors in the push-pull circuit to achieve high harmonic suppression of signals.
It realizes efficient harmonic rejection, reduces power loss, improves circuit reliability and signal quality, and has the advantages of simple structure, easy to implement and low cost.
Smart Images
Figure CN223141891U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of microwave, and particularly relates to a push-pull circuit with high harmonic suppression. Background Art
[0002] With the development of electronic countermeasure and active phased array radar, a large number of nonlinear loads have emerged in the circuit system, such as converter devices for high-voltage DC transmission, high-power rectification, etc. These loads generate various non-sinusoidal currents under the action of sinusoidal voltage, namely harmonics. Harmonics have a serious impact on the stability and reliability of the power system, such as causing signal distortion, increasing power loss, endangering electrical equipment, interfering with communication, etc. Therefore, suppressing harmonics has become one of the important problems urgently needed to be solved in the modern electronic field. Content of the Utility Model
[0003] To solve the above technical problems, the utility model proposes a push-pull circuit with high harmonic suppression, which has high reliability, low power loss and good harmonic suppression.
[0004] To achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A push-pull circuit with high harmonic suppression, characterized in that: it includes a radio frequency input, a radio frequency output, a harmonic suppression circuit and a push-pull circuit. The radio frequency input is connected to the input end of the harmonic suppression circuit, the output end of the harmonic suppression circuit is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the radio frequency output.
[0006] The harmonic suppression circuit includes a balun and an amplifier. The balun includes balun 1 and balun 2. The radio frequency input is connected to balun 1 and inputs a radio frequency signal to balun 1. Balun 1 is connected to the amplifier, the amplifier is connected to balun 2, and π attenuations are respectively arranged between balun 1 and the amplifier and between the amplifier and balun 2.
[0007] When a radio frequency signal is input to balun 1, two signals with opposite phases are generated by balun 1. Since the two signals entering balun 2 have opposite phases, when the harmonic is an even harmonic, the two harmonic signals cancel each other out. When the harmonic suppression is poor, the harmonic suppression is optimized by adjusting the attenuation value of the π attenuation.
[0008] The input end of the balun 2 is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the RF output. The push-pull circuit includes resistors R4, R7, R12, R13, NPN transistor Q1, PNP transistor Q2, and capacitor C8. The resistors R7 and R12 are serially connected to transistors Q1 and Q2. The balun 2 is connected between resistors R7 and R12. The resistor R4 is connected in parallel across both ends of resistor R7. The resistor R13 is connected in parallel across both ends of resistor R12. The pin 1 of the NPN transistor Q1 is connected to the resistor R7. The pin 2 of the NPN transistor Q1 is connected to the pin 3 of the transistor Q2. The pin 3 of the NPN transistor Q1 is connected to the power supply. The pin 1 of the PNP transistor Q2 is connected to the resistor R12. The pin 2 of the PNP transistor Q2 is grounded. The capacitor C8 is connected in parallel across both ends of the PNP transistor Q2.
[0009] The low level of the square wave signal entering the push-pull circuit through the balun 2 is 0, the high level is 5V, and there are rising and falling slopes. When the square wave signal rises to 0.7V, Q1 conducts and Q2 does not conduct, and the capacitor C8 is charged to 4.3V. When the square wave signal converts from the high level to the low level, at this time, the capacitor C8 starts to discharge, Q1 does not conduct, and Q2 conducts, and so on in a cycle.
[0010] Further: The balun 1 is provided with pins 1, 2, 3, 4, and 5. The RF input is connected to pin 1. The pins 2 and 3 are respectively connected to the amplifier. The pins 4 and 5 are respectively grounded.
[0011] Further: The balun 2 is provided with pins 1, 2, 3, 4, and 5. The amplifier is respectively connected to pins 1 and 4. The pins 3 and 5 are respectively grounded. The pin 2 is connected to the input end of the push-pull circuit.
[0012] Further: The NPN transistor Q1 is an MMBT2222A type transistor, and the PNP transistor Q2 is an MMBT3906 type transistor.
[0013] Further: Both the balun 1 and the balun 2 are TTC1-682W+ type baluns, the coil turn ratio is 1:1, and the operating frequency is 800 MHz - 6800 MHz.
[0014] Further: The amplifier is an ABA-53563 type amplifier, the gain is 21.5 dB, and the operating bandwidth is 0 - 3.5 GHz.
[0015] In the above structure: A push-pull circuit with high harmonic suppression proposed by the present utility model includes a radio frequency input, a radio frequency output, a harmonic suppression circuit, and a push-pull circuit. Among them, the radio frequency input is connected to the input end of the harmonic suppression circuit, the output end of the harmonic suppression circuit is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the radio frequency output.
[0016] In this application, two signals with opposite phases are generated by the balun 1, and the amplifier amplifies the signals to achieve the amplification function. Harmonic suppression is achieved through the balun 2. Specifically: The radio frequency signal generates two signals with opposite phases through the balun 1, and then two amplifiers with the same specifications and models amplify the two signals with opposite phases respectively. The amplified signals are then input into the balun 2, thereby generating a high harmonic suppression signal. The high harmonic suppression signal enters the push-pull circuit, thereby generating the final push-pull signal with high harmonic suppression.
[0017] In this application, the harmonic suppression circuit includes a balun 1, a balun 2, and two amplifiers. The balun uses the TTC1-682W+ type balun of Mini-Circuits Company. The turns ratio of the balun coil is 1:1, and the operating frequency is 800 MHz - 6800 MHz. The radio frequency signal generates two signals with opposite phases through the balun 1. Since the two signals entering the balun 2 have opposite phases, when the harmonic is an even harmonic, the two harmonic signals cancel each other out, thereby achieving high suppression of the harmonic signal. The amplifier uses the ABA-53563 type amplifier of BROADCOM, with a gain of 21.5 dB and an operating bandwidth of 0 - 3.5 GHz. There is a π attenuation at each of the front and rear sections of the amplifier ABA-53563 to better control its amplification effect. When the harmonic suppression is poor, the harmonic suppression can be further optimized by adjusting the π attenuation value. In addition, there are three filter capacitors from the VCC power supply pin of the amplifier to ground to reduce the influence of the power supply on the circuit harmonics.
[0018] The NPN transistor Q1 of the push-pull circuit uses the MMBT2222A type transistor of Diodes Company, and the PNP transistor Q2 also uses the MMBT3906 type transistor of Diodes Company. The voltage drop between the base and the emitter of the MMBT2222A type transistor is between 0.6 V and 1.2 V. Assuming the voltage drop is 0.7 V, the low level of the square wave signal entering the push-pull circuit is 0, the high level is 5 V, and there are rising and falling slopes. When the square wave signal rises to 0.7 V, Q1 conducts, Q2 does not conduct, and the capacitor C8 is charged to 4.3 V; when the square wave signal changes from the high level to the low level, at this time the capacitor C8 starts to discharge, Q1 does not conduct, and Q2 conducts. This cycle repeats, thereby achieving the push-pull effect on the signal.
[0019] Compared with the prior art, the beneficial effects of the present utility model are:
[0020] The utility model generates two signals in opposite directions through the balun 1, thereby realizing the phase inversion of the signal, amplifies the signal through the amplifier to achieve the amplification function, and the balun 2 filters the amplified signal to generate a high harmonic suppression signal, realizing high harmonic suppression. The utility model has the advantages of simple structure, easy implementation, low cost, etc., and has broad application prospects. Description of the Drawings
[0021] Figure 1 is the principle block diagram of the utility model.
[0022] Figure 2 is the circuit block diagram of the amplifier in the utility model.
[0023] Figure 3 is the schematic diagram of the utility model. Detailed Embodiment
[0024] The following further describes the utility model in detail in conjunction with the drawings and the detailed embodiment:
[0025] As Figures 1-3 shown, a push-pull circuit for high harmonic suppression proposed by the utility model includes a radio frequency input, a radio frequency output, a harmonic suppression circuit, and a push-pull circuit. The radio frequency input is connected to the input end of the harmonic suppression circuit, the output end of the harmonic suppression circuit is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the radio frequency output.
[0026] The harmonic suppression circuit includes a balun and an amplifier. The balun includes balun 1 and balun 2. The radio frequency input is connected to balun 1 and inputs a radio frequency signal to balun 1. Balun 1 is connected to the amplifier, and the amplifier is connected to balun 2. Pi attenuations are respectively arranged between balun 1 and the amplifier, and between the amplifier and balun 2.
[0027] When a radio frequency signal is input to balun 1, two signals with opposite phases are generated through balun 1. Since the two signals entering balun 2 have opposite phases, when the harmonic is an even harmonic, the harmonic signals of the two cancel each other out. When the harmonic suppression is poor, the harmonic suppression is optimized by adjusting the attenuation value of the pi attenuation.
[0028] The input end of the balun 2 is connected to the input end of the push-pull circuit, and the output end of the push-pull circuit is connected to the RF output. The push-pull circuit includes resistors R4, R7, R12, R13, NPN transistor Q1, PNP transistor Q2, and capacitor C8. The resistors R7 and R12 are connected in series with transistors Q1 and Q2. The balun 2 is connected between resistors R7 and R12. The resistor R4 is connected in parallel across the two ends of resistor R7. The resistor R13 is connected in parallel across the two ends of resistor R12. The pin 1 of the NPN transistor Q1 is connected to the resistor R7. The pin 2 of the NPN transistor Q1 is connected to the pin 3 of the transistor Q2. The pin 3 of the NPN transistor Q1 is connected to the power supply. The pin 1 of the PNP transistor Q2 is connected to the resistor R12. The pin 2 of the PNP transistor Q2 is grounded. The capacitor C8 is connected in parallel across the PNP transistor Q2.
[0029] The low level of the square wave signal entering the push-pull circuit through the balun 2 is 0, the high level is 5V, and there are rising and falling slopes. When the square wave signal rises to 0.7V, Q1 conducts and Q2 does not conduct, and the capacitor C8 is charged to 4.3V. When the square wave signal transitions from the high level to the low level, at this time the capacitor C8 starts to discharge, Q1 does not conduct, and Q2 conducts, and so on in a cycle.
[0030] The balun 1 is provided with pins 1, 2, 3, 4, and 5. The RF input is connected to pin 1. The pins 2 and 3 are respectively connected to the amplifier. The pins 4 and 5 are respectively grounded. The balun 2 is provided with pins 1, 2, 3, 4, and 5. The amplifier is respectively connected to pins 1 and 4. The pins 3 and 5 are respectively grounded. The pin 2 is connected to the input end of the push-pull circuit. The NPN transistor Q1 is an MMBT2222A type transistor. The PNP transistor Q2 is an MMBT3906 type transistor. Both the balun 1 and the balun 2 are TTC1-682W+ type baluns, with a coil turn ratio of 1:1 and an operating frequency of 800 MHz - 6800 MHz. The amplifier is an ABA-53563 type amplifier with a gain of 21.5 dB and an operating bandwidth of 0 - 3.5 GHz.
[0031] A push-pull circuit with high harmonic suppression proposed by the present utility model includes an RF input, an RF output, a harmonic suppression circuit, and a push-pull circuit. Among them, the RF input is connected to the input end of the harmonic suppression circuit. The output end of the harmonic suppression circuit is connected to the input end of the push-pull circuit. The output end of the push-pull circuit is connected to the RF output.
[0032] In this application, a balun 1 is used to generate two signals with opposite phases. The amplifier amplifies the signals to achieve the amplification function. Harmonic suppression is achieved through balun 2. Specifically, the RF signal passes through balun 1 to generate two signals with opposite phases, which are then amplified by two amplifiers of the same specification and model for the two signals with opposite phases. The amplified signals are then input into balun 2 to generate a high harmonic suppression signal, and the high harmonic suppression signal enters the push-pull circuit to generate the final push-pull signal with high harmonic suppression.
[0033] In this application, the harmonic suppression circuit includes balun 1, balun 2 and two amplifiers. The balun uses the TTC1-682W+ type balun of Mini-Circuits company. The turns ratio of the balun coil is 1:1, and the operating frequency is 800 MHz - 6800 MHz. The RF signal generates two signals with opposite phases through balun 1. Since the two signals entering balun 2 have opposite phases, when the harmonic is an even harmonic, the two harmonic signals cancel each other out, thus achieving high suppression of the harmonic signal. The amplifier uses the ABA-53563 type amplifier of BROADCOM, with a gain of 21.5 dB and an operating bandwidth of 0 - 3.5 GHz. There is a π attenuation at both the front and rear sections of the amplifier ABA-53563 to better control its amplification effect. When the harmonic suppression is poor, the harmonic suppression can be further optimized by adjusting the π attenuation value. In addition, there are three filter capacitors from the VCC power supply pin of the amplifier to ground to reduce the influence of the power supply on the circuit harmonics.
[0034] The NPN transistor Q1 of the push-pull circuit uses the MMBT2222A type transistor of Diodes company, and the PNP transistor Q2 also uses the MMBT3906 type transistor of Diodes company. The voltage drop between the base and emitter of the MMBT2222A type transistor is between 0.6 V and 1.2 V. Assuming the voltage drop is 0.7 V, the low level of the square wave signal entering the push-pull circuit is 0, the high level is 5 V, and there are rising and falling slopes. When the square wave signal rises to 0.7 V, Q1 conducts, Q2 does not conduct, and the capacitor C8 is charged to 4.3 V; when the square wave signal transitions from the high level to the low level, the capacitor C8 starts to discharge at this time, Q1 does not conduct, and Q2 conducts. This cycle repeats, thus achieving the push-pull effect on the signal.
[0035] This utility model generates two signals in opposite directions through balun 1, thus achieving signal inversion. The amplifier amplifies the signal to achieve the amplification function. Balun 2 then filters the amplified signal to generate a high harmonic suppression signal, achieving high harmonic suppression. This utility model has the advantages of simple structure, easy implementation, low cost, etc., and has broad application prospects.
[0036] The above are only the preferred embodiments of the present utility model, and do not constitute any other form of limitation to the present utility model. Any modification or equivalent change made according to the technical essence of the present utility model still falls within the scope protected by the present utility model.
Claims
1. A push-pull circuit with high harmonic suppression, characterized in that: It includes a radio frequency input, a radio frequency output, a harmonic suppression circuit, and a push-pull circuit. The radio frequency input is connected to the input end of the harmonic suppression circuit. The output end of the harmonic suppression circuit is connected to the input end of the push-pull circuit. The output end of the push-pull circuit is connected to the radio frequency output. The harmonic suppression circuit includes a balun and an amplifier. The balun includes balun 1 and balun 2. The radio frequency input is connected to balun 1 and inputs a radio frequency signal to balun 1. Balun 1 is connected to the amplifier. The amplifier is connected to balun 2. Pi attenuations are respectively provided between balun 1 and the amplifier, and between the amplifier and balun 2. When a radio frequency signal is input to balun 1, two signals with opposite phases are generated by balun 1. Since the two signals entering balun 2 have opposite phases, when the harmonic is an even harmonic, the harmonic signals of the two cancel each other out. When the harmonic suppression is poor, the harmonic suppression is optimized by adjusting the attenuation value of the pi attenuation. Balun 2 is connected to the input end of the push-pull circuit. The output end of the push-pull circuit is connected to the radio frequency output. The push-pull circuit includes resistors R4, R7, R12, R13, NPN transistor Q1, PNP transistor Q2, and capacitor C8. Resistors R7 and R12 are connected in series with transistors Q1 and Q2. Balun 2 is connected between resistors R7 and R12. Resistor R4 is connected in parallel across the two ends of resistor R7. Resistor R13 is connected in parallel across the two ends of resistor R12. The pin 1 of NPN transistor Q1 is connected to resistor R7. The pin 2 of NPN transistor Q1 is connected to the pin 3 of transistor Q2. The pin 3 of NPN transistor Q1 is connected to the power supply. The pin 1 of PNP transistor Q2 is connected to resistor R12. The pin 2 of PNP transistor Q2 is grounded. Capacitor C8 is connected in parallel across PNP transistor Q2. The low level of the square wave signal entering the push-pull circuit through balun 2 is 0, the high level is 5V, and there are rising and falling slopes. When the square wave signal rises to 0.7V, Q1 conducts and Q2 does not conduct, and capacitor C8 is charged to 4.3V. When the square wave signal converts from the high level to the low level, at this time capacitor C8 starts to discharge, Q1 does not conduct, and Q2 conducts, and so on in a cycle.
2. The push-pull circuit with high harmonic suppression according to claim 1, wherein: There are pins 1, 2, 3, 4, and 5 provided on balun 1. The radio frequency input is connected to pin 1. Pins 2 and 3 are respectively connected to the amplifier. Pins 4 and 5 are respectively grounded.
3. The push-pull circuit with high harmonic suppression according to claim 1, characterized in that: There are pins 1, 2, 3, 4, and 5 provided on balun 2. The amplifier is respectively connected to pins 1 and 4. Pins 3 and 5 are respectively grounded. Pin 2 is connected to the input end of the push-pull circuit.
4. A push-pull circuit for high harmonic suppression according to claim 1, characterized in that: The NPN transistor Q1 is an MMBT2222A type transistor. The PNP transistor Q2 is an MMBT3906 type transistor.
5. A push-pull circuit with high harmonic suppression according to claim 1, characterized in that: Both balun 1 and balun 2 are TTC1-682W+ type baluns, the coil turn ratio is 1:1, and the operating frequency is 800 MHz - 6800 MHz.
6. The push-pull circuit with high harmonic suppression according to claim 1, wherein: The amplifier is an ABA-53563 type amplifier, the gain is 21.5 dB, and the operating bandwidth is 0 - 3.5 GHz.