CN201499137U - Power amplifier - Google Patents
Power amplifier Download PDFInfo
- Publication number
- CN201499137U CN201499137U CN2009202280162U CN200920228016U CN201499137U CN 201499137 U CN201499137 U CN 201499137U CN 2009202280162 U CN2009202280162 U CN 2009202280162U CN 200920228016 U CN200920228016 U CN 200920228016U CN 201499137 U CN201499137 U CN 201499137U
- Authority
- CN
- China
- Prior art keywords
- circuit
- links
- output
- input
- power
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
A power amplifier comprises a control circuit, a driving circuit and a main circuit, wherein the control circuit converts a control signal into a modulated PWM signal, the driving circuit transforms two PWM signals from the control circuit into four independent PWM signals, and the main circuit outputs high-frequency square waves from a main power source. The power amplifier is applicable for driving an energy transducer, and has the advantages of simple structure, convenient use, adaptability to load matching, and low energy consumption by using a switch mode.
Description
Technical field
The utility model relates to a kind of power amplification parts, particularly is applicable to the broadband signal power amplifier that drives transducer.
Background technology
At present, what the power amplifier application was more is the high-frequency amplifier of low-frequency signal amplifier and fixed frequency, mostly is linear model, and energy consumption is big, mainly is applicable to the audio signal power amplification.But at some special occasions, such as driving transducer, needing amplifying signal is broadband signal, and the impedance of load has specific (special) requirements, and so, common power amplifier is in bandwidth, and load impedance coupling aspect all can not satisfy the requirement of certain loads.
Summary of the invention
The purpose of this utility model is exactly in order to overcome above-mentioned the deficiencies in the prior art part, and a kind of power amplifier is provided, and it is that a kind of incoming frequency is 1K～5K broadband sine voltage signal, power output is 1KW, be fit to load matched, adopt switching mode, the power amplifier that energy consumption is low.
The purpose of this utility model realizes by following technical measures: power amplifier, it comprises the control circuit that control signal is converted to the pwm signal (pulse width modulating signal) after the modulation, to be transformed to 4 tunnel drive circuits of pwm signal independently from 2 road pwm signals of control circuit, and the main circuit that main power source is transformed to high frequency square wave, described control circuit, drive circuit, main circuit respectively with control power supply, driving power links to each other with main power source, the input of control circuit links to each other with control signal, the output of control circuit links to each other with the input of drive circuit, and the output of drive circuit links to each other with the input of main circuit.
In technique scheme, this power amplifier also comprises the protective circuit that is used to detect bus current signal and voltage signal.
In technique scheme, described control circuit comprises the UC3637 chip circuit, active band-pass filter, amplitude limiter circuit, dead-zone circuit, logic lockout circuit and PWM shaping circuit; Described UC3637 chip circuit comprises proportional amplifier, bipolarity pulse width modulator and triangular-wave generator; Described active band-pass filter links to each other with the input of UC3637 chip circuit after amplitude limiter circuit, the output of UC3637 chip circuit links to each other with the input of dead-zone circuit, the output of dead-zone circuit links to each other with the input of logic lockout circuit, the output of logic lockout circuit links to each other with the input of PWM shaping circuit, and the output of PWM shaping circuit links to each other with drive circuit.
In technique scheme, described drive circuit comprises optical coupling isolation circuit, secondary dead-zone circuit, logic power, 2 IR2110 circuit and bootstrap power supply thereof; The input of described optical coupling isolation circuit links to each other with control circuit, the output of optical coupling isolation circuit links to each other with the secondary dead-zone circuit, the input of logic power links to each other with driving power, the output of logic power links to each other with the secondary dead-zone circuit, the output of secondary dead-zone circuit links to each other with 2 IS2110 circuit respectively, 2 IS2110 circuit are by its bootstrap power supply power supply, and the output of 2 IS2110 circuit links to each other with main circuit.
In technique scheme, described main circuit constitutes full-bridge circuit by four MOSFET (metal-oxide layer-semiconductor-field-effect transistor), and each MOSFET is parallel with diode, main circuit output LOAD external load.
The utility model is simple in structure, and is easy to use, compared with prior art has the following advantages:
(1) behind the matched filter networks such as cooperation suitable transformer and inductance, can be certain loads voltage identical with voltage waveform signal, that voltage magnitude satisfies instructions for use is provided.By the special instructions for use design of certain loads, when input signal was the sine voltage signal of 1000Hz～5000Hz, its output voltage waveforms was the sinusoidal pulse width modulation ripple identical with the input voltage signal frequency.
(2) have protective circuit, detect bus current, voltage is guaranteed circuit safety.
(3) power consumption is little, and volume is little, and adaptability is strong, is convenient to embedded installation.
Description of drawings
Fig. 1 is the integrated circuit schematic diagram of the utility model power amplifier.
Fig. 2 is a control circuit schematic diagram among the utility model embodiment.
Fig. 3 is a UC3637 chip circuit connection layout in the utility model embodiment control circuit.
Fig. 4 is a drive circuit schematic diagram among the utility model embodiment.
Fig. 5 is a main circuit connection layout among the utility model embodiment.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of power amplifier, it comprises the control circuit that control signal is converted to the pwm signal after the modulation, to be transformed to 4 tunnel drive circuits of pwm signal independently from 2 road pwm signals of control circuit, and the main circuit that main power source is transformed to high frequency square wave, described control circuit, drive circuit, main circuit link to each other with main power source with control power supply, driving power respectively, the input of control circuit links to each other with control signal, the output of control circuit links to each other with the input of drive circuit, and the output of drive circuit links to each other with the input of main circuit.
During use, the DC200V main power source is transformed to high frequency square wave through main circuit, becomes the signal voltage of satisfying the demand behind matched filter network, offers load.
As shown in Figure 2, it is the bipolarity modulation circuit of core that described control circuit adopts with the UC3637 chip circuit, the UC3637 chip is the two PWM controllers that are applied to DC motor control that UNITRODE company produces, and has the output of two-way pwm signal totem, has good control performance.Adopt the UC3637 chip can constitute two edge, the bipolarity of function admirable, the sine pulse width modulator (SPWM) of synchronous modulation,, determine to control power supply employing ± 15V accessory power supply according to the power reguirements of UC3637 chip.The UC3637 chip circuit comprises the triangular-wave generator of proportional amplifier, 40kHZ, the bipolarity pulse width modulator.The signal of proportional amplifier output and the triangular signal of 40kHz are given the bipolarity pulse width modulator simultaneously, obtain the bipolarity modulation signal of 2 tunnel complementations after the modulation.
Comprise the UC3637 chip circuit in the described control circuit, active band-pass filter, amplitude limiter circuit, dead-zone circuit, logic lockout circuit and PWM shaping circuit; Enter the UC3637 chip circuit after control signal process active band-pass filter and the amplitude limiter circuit, the output of UC3637 chip circuit links to each other with the input of dead-zone circuit, the output of dead-zone circuit links to each other with the input of logic lockout circuit, the output of logic lockout circuit links to each other with the input of PWM shaping circuit, and the output of PWM shaping circuit is exported 2 road pwm signals.
Wherein the connected mode of UC3637 chip circuit as shown in Figure 3, the input port Vg of UC3637 chip circuit connects the input signal behind active band-pass filter, output port Vp connects amplitude limiter circuit, power port VDD and Vss connect positive-negative power respectively, and the signal that the bipolarity pulse width modulator produces is from port VAout and port VBout output.
Increase active band-pass filter at signal input part: low-end cut-off frequency is set in 800Hz, and high-end cut-off frequency is set in 7000Hz.Purpose is to prevent that the signal frequency that enters exceeds this frequency range because of the reason of signal source itself or the interference of transmission line.Because when signal frequency is lower than 600Hz, cause core sataration easily.When signal frequency is higher than the carrier frequency of controller setting, will cause the frequent switch of power MOSFET, switching loss increases, and heating is serious, influences the operate as normal of circuit.
The effect of amplitude limiter circuit is the output voltage of restriction active band-pass filter, cooperates the suitable proportionality coefficient of proportional amplifier, guarantees that the output waveform of control circuit keeps bipolar mode.
The effect of dead-zone circuit is to avoid bridge arm direct pass.The effect of PWM shaping circuit is voltage transformation, impedance matching.
As shown in Figure 4, described drive circuit is a core with the IR2110 chip, and drive circuit comprises optical coupling isolation circuit, secondary dead-zone circuit, logic power, 2 IR2110 circuit and bootstrap power supply thereof; 2 road pwm signals that the drive circuit input receives are input to the secondary dead-zone circuit behind optical coupling isolation circuit, the input of logic power links to each other with driving power, the output of logic power links to each other with the secondary dead-zone circuit, the output of secondary dead-zone circuit links to each other with 2 IS2110 circuit respectively, 2 IS2110 circuit are by its bootstrap power supply power supply, and the output of 2 IS2110 circuit is exported 4 road pwm signals.
Through the great mass of data inquiry, determining to select for use with the IR2110 chip is the drive circuit of core, and the IR2110 chip is that American I R company releases, is applicable to the bootstrap type integrated circuit that power MOSFET, IGBT drive.Select the quantity that can significantly reduce driving power behind this chip for use, when adopting IR2110 to drive, only need one road driving power to get final product.According to the power reguirements of IR2110, determine driving power employing+20V accessory power supply.
Just arrive the grid of power tube behind the multi-level pmultistage circuits such as the signal process logical conversion that consideration is exported from control circuit, comparator shaping, light-coupled isolation transmission, chip for driving,, influence the steady operation of circuit because the influence of transmission delay can lose the part dead band.For effectively addressing this problem, taked to be provided with the measure of secondary dead-zone circuit in the design: increase by one group of dead-zone circuit in drive circuit, the dead-zone circuit parallel operation in this group secondary dead-zone circuit and the control circuit is reliably avoided bridge arm direct pass.
The effect of logic power is the 15V power supply that the driving power of 20V is transformed into suitable dead-zone circuit use.The effect of bootstrap power supply provides driving (shutoff) and goes up the needed power supply of pipe.
As shown in Figure 5, described main circuit constitutes full-bridge circuit by four MOSFET, and each MOSFET is parallel with diode, output LOAD external load.
In fact the utility model power amplifier constitutes a single-phase inverter after adding matched filter networks such as transformer and inductance, takes all factors into consideration the economy of products characteristics and system etc., and circuit structure is selected full-bridge (H bridge) structure for use.Though full bridge structure power switch quantity has increased by 1 times, circuit structure is simple relatively.MOSFETV1, MOSFETV2, MOSFETV3, MOSFETV4 constitute the H bridge, will be PWM voltage from the direct voltage inversion of bus, and its output waveform is by G1, G2, G3, G4 decision.
In the present embodiment, described power amplifier also comprises and is used to detect bus current signal and voltage signal, blocks the protective circuit of control circuit output waveform when it surpasses setting.
In sum, every technical performance of the utility model power amplifier is as follows:
A) input signal: ± 10Vp-p, 1000Hz～5000Hz wideband random signal
B) input impedance:＞100k
C) output voltage root-mean-square value (output of band transformer): ≮ 600V
D) protection: possess overvoltage, overcurrent, short-circuit protection function
E) output maximum effective power: 1000W
F) main circuit power supply power supply: DC200V
Control and driving ring current: ± 15V and a tunnel be the 20V power supply independently
G) output self noise: be lower than rated output voltage 30dB.
Claims (5)
1. power amplifier, it is characterized in that: it comprises the control circuit that control signal is converted to the pwm signal after the modulation, to be transformed to 4 tunnel drive circuits of pwm signal independently from 2 road pwm signals of control circuit, and the main circuit that main power source is transformed to high frequency square wave, described control circuit, drive circuit, main circuit link to each other with main power source with control power supply, driving power respectively, the input of control circuit links to each other with control signal, the output of control circuit links to each other with the input of drive circuit, and the output of drive circuit links to each other with the input of main circuit.
2. power amplifier according to claim 1 is characterized in that: this power amplifier also comprises the protective circuit that is used to detect bus current signal and voltage signal.
3. power amplifier according to claim 1 is characterized in that: described control circuit comprises the UC3637 chip circuit, active band-pass filter, amplitude limiter circuit, dead-zone circuit, logic lockout circuit and PWM shaping circuit; Described UC3637 chip circuit comprises proportional amplifier, bipolarity pulse width modulator and triangular-wave generator; Described active band-pass filter links to each other with the input of UC3637 chip circuit after amplitude limiter circuit, the output of UC3637 chip circuit links to each other with the input of dead-zone circuit, the output of dead-zone circuit links to each other with the input of logic lockout circuit, the output of logic lockout circuit links to each other with the input of PWM shaping circuit, and the output of PWM shaping circuit links to each other with drive circuit.
4. power amplifier according to claim 1 is characterized in that: described drive circuit comprises optical coupling isolation circuit, secondary dead-zone circuit, logic power, 2 IR2110 circuit and bootstrap power supply thereof; The input of described optical coupling isolation circuit links to each other with control circuit, the output of optical coupling isolation circuit links to each other with the secondary dead-zone circuit, the input of logic power links to each other with driving power, the output of logic power links to each other with the secondary dead-zone circuit, the output of secondary dead-zone circuit links to each other with 2 IS2110 circuit respectively, 2 IS2110 circuit are by its bootstrap power supply power supply, and the output of 2 IS2110 circuit links to each other with main circuit.
5. power amplifier according to claim 1, it is characterized in that: described main circuit constitutes full-bridge circuit by four metal-oxide layer-semiconductor-field-effect transistors, each metal-oxide layer-semiconductor-field-effect transistor all is parallel with diode, main circuit output LOAD external load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202280162U CN201499137U (en) | 2009-09-09 | 2009-09-09 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202280162U CN201499137U (en) | 2009-09-09 | 2009-09-09 | Power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201499137U true CN201499137U (en) | 2010-06-02 |
Family
ID=42442333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202280162U Expired - Fee Related CN201499137U (en) | 2009-09-09 | 2009-09-09 | Power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201499137U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497145A (en) * | 2011-12-01 | 2012-06-13 | 北京交通大学 | H-bridge driving circuit |
| CN107044483A (en) * | 2016-10-18 | 2017-08-15 | 常州工学院 | The system that firm type is used for the intelligent power amplifier of active magnetic |
| CN109586676A (en) * | 2019-01-24 | 2019-04-05 | 江门市川琪科技有限公司 | A kind of full load automatic gain mesh power amplifier |
| CN110098813A (en) * | 2019-04-03 | 2019-08-06 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Low-power consumption pulse power amplifier |
| CN110649898A (en) * | 2019-10-21 | 2020-01-03 | 严添明 | Preamplifier of automatic bidirectional amplitude limiting broadband D-class audio power amplifier |
-
2009
- 2009-09-09 CN CN2009202280162U patent/CN201499137U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497145A (en) * | 2011-12-01 | 2012-06-13 | 北京交通大学 | H-bridge driving circuit |
| CN102497145B (en) * | 2011-12-01 | 2014-04-02 | 北京交通大学 | H-bridge driving circuit |
| CN107044483A (en) * | 2016-10-18 | 2017-08-15 | 常州工学院 | The system that firm type is used for the intelligent power amplifier of active magnetic |
| CN109586676A (en) * | 2019-01-24 | 2019-04-05 | 江门市川琪科技有限公司 | A kind of full load automatic gain mesh power amplifier |
| CN110098813A (en) * | 2019-04-03 | 2019-08-06 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Low-power consumption pulse power amplifier |
| CN110649898A (en) * | 2019-10-21 | 2020-01-03 | 严添明 | Preamplifier of automatic bidirectional amplitude limiting broadband D-class audio power amplifier |
| CN110649898B (en) * | 2019-10-21 | 2023-04-07 | 严添明 | Preamplifier of automatic bidirectional amplitude limiting broadband D-class audio power amplifier |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206180854U (en) | Three level power amplifier circuit of single -stage | |
| CN107465347B (en) | Energy double-direction control strategy suitable for LLC resonant converter | |
| CN202261070U (en) | H-bridge inverter circuit | |
| CN201499137U (en) | Power amplifier | |
| CN203151396U (en) | Multifunctional numerical-control pulse power supply | |
| CN203747686U (en) | Single-phase mixed three-level grid-connected inverter | |
| CN103746591A (en) | H6 one-phase non-isolated photovoltaic grid-connected inverter and modulation method thereof | |
| CN108988646B (en) | DAB (digital audio broadcasting) optimization control method with voltage transmission ratio larger than 1 under zero-voltage switch | |
| CN106787757A (en) | A kind of CLTCL resonance DCs converter | |
| CN201994871U (en) | Photovoltaic grid six-switch tube bridge inverter | |
| CN102104333A (en) | Three-level half-bridge voltage balance converter | |
| CN103715913B (en) | Mixing type current converting method suitable for two-stage matrix converter rectification stage | |
| CN1929278B (en) | Cascading multiple electrical level double decompression semi-bridge converter | |
| CN101783582A (en) | Single-input dual-output pulse-width modulation signal generating circuit with adjustable dead time | |
| CN103973153A (en) | High-power numerical control pulse frequency modulation power supply of electric arc cutting machine tool | |
| CN110048632B (en) | Linear variable frequency power supply based on high-efficiency high-capacity linear power amplifier | |
| CN206226317U (en) | The integrated three-level dual-buck half-bridge inverter of magnetic | |
| CN202759643U (en) | LED television and backlight driving circuit thereof | |
| CN106160480B (en) | Power transducer device | |
| CN104779807A (en) | LLC resonance transducer applied to distributed power source | |
| CN203775066U (en) | T-type three-level three-phase inverter driving system | |
| CN103647437A (en) | High-voltage high-current IGBT driving system | |
| CN104300780A (en) | Large power non-isolation DC/DC soft switching circuit | |
| CN106712470A (en) | Improved magnetic isolation type IGBT driving circuit | |
| CN201393178Y (en) | Z-source half-bridge inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20120909 |