CN111884611B - Dual-isolation power amplifier circuit - Google Patents
Dual-isolation power amplifier circuit Download PDFInfo
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- CN111884611B CN111884611B CN202010795632.7A CN202010795632A CN111884611B CN 111884611 B CN111884611 B CN 111884611B CN 202010795632 A CN202010795632 A CN 202010795632A CN 111884611 B CN111884611 B CN 111884611B
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- 238000002955 isolation Methods 0.000 title claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000003973 irrigation Methods 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 5
- 230000002265 prevention Effects 0.000 claims 4
- 230000006641 stabilisation Effects 0.000 abstract description 5
- 238000011105 stabilization Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
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Abstract
The utility model discloses a double-isolation power amplifier circuit, which comprises an optical coupler isolation circuit, a logic control circuit, an H-bridge driving circuit, an H-bridge circuit, a power supply circuit and an overvoltage and overcurrent protection circuit, wherein the optical coupler isolation circuit is connected with the logic control circuit; the optical coupling isolation circuit is connected with the input end of the H bridge driving circuit through the logic control circuit; the output end of the H-bridge driving circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge driving circuit and the H-bridge circuit respectively; and the output end of the H bridge circuit is connected with the overvoltage and overcurrent protection circuit. According to the H-bridge circuit, the positive end and the negative end of the motor adopt two freewheeling modes of upward freewheeling of the diode and downward freewheeling of the diode at the same time, so that the motor voltage can be prevented from exceeding the power supply voltage; in the H bridge circuit, the capacitor and the resistor are connected in series to realize follow current voltage stabilization, so that the influence of power supply fluctuation and an external magnetic field on the operation index of the motor can be prevented, and the reliability and the stability of the circuit are improved.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a double-isolation power amplifier circuit.
Background
At present, a motor driving circuit for a missile pulling head control system generally adopts input optocoupler isolation, pulse width modulation signals are changed into two complementary pulse width modulation signals through a resistor and a NOT circuit, the two complementary pulse signals are used for controlling an H bridge, and the circuit has the following defects:
(1) The working voltage range is narrow;
(2) The protection to surge voltage is very small;
(3) The anti-interference capability is low;
(4) The power supply voltage interference resistance is low;
(5) The adaptability to electromagnetic compatibility is low;
the technical requirements of the modern military electric control system are not met.
Disclosure of Invention
The utility model aims to solve the problems and provide a double-isolation power amplifier circuit which comprises an optocoupler isolation circuit, a logic control circuit, an H-bridge driving circuit, an H-bridge circuit, a power supply circuit and an overvoltage and overcurrent protection circuit; the optical coupling isolation circuit is connected with the input end of the H bridge driving circuit through the logic control circuit; the output end of the H-bridge driving circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge driving circuit and the H-bridge circuit respectively; and the output end of the H bridge circuit is connected with the overvoltage and overcurrent protection circuit.
The utility model has the beneficial effects that:
1) The input and output are isolated by an optical coupler, so that the anti-interference capability of the circuit is enhanced; the method comprises the steps of carrying out a first treatment on the surface of the
2) The circuit is provided with an upward freewheeling diode and has the capability of eliminating the reverse voltage of the motor;
3) The circuit is provided with a downward freewheeling diode and has the capability of eliminating the reverse voltage of the motor;
4) The circuit has the functions of capacitor resistance follow current voltage stabilization and motor counter voltage and voltage surge elimination;
5) The circuit has an overvoltage protection function;
6) The circuit has an overcurrent protection function;
7) The circuit has a surge voltage protection function;
8) The circuit has the protection function of preventing power supply interference;
9) The circuit has a power supply noise protection function;
10 A circuit having an enable protection function.
Drawings
FIG. 1 is a system diagram of the present utility model;
FIG. 2 is a circuit diagram of a logic control circuit;
FIG. 3 is a circuit diagram of an H-bridge drive circuit;
FIG. 4 is a circuit diagram of an H-bridge circuit;
FIG. 5 is a circuit diagram of an over-voltage and over-current protection circuit;
fig. 6 is a circuit diagram of a power supply circuit.
In the figure: RT 1-a first current limiting resistor; RT 2-a second current limiting resistor; RT 3-third current limiting resistor; RT 4-fourth current limiting resistor; QT 1-first transistor; QT 2-second transistor; QT 3-third transistor; QT 4-fourth triode; U0-H bridge driving circuit; U1-H bridge circuit; u2-a first operational amplifier; u3-a second operational amplifier; u4-a third operational amplifier; q1-a first MOS tube; q2-a second MOS tube; q3-a third MOS tube; q4-a fourth MOS tube; q5-a fifth MOS tube; q6-a sixth MOS tube; q7-a seventh MOS tube; q8-eighth MOS tube; r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7-seventh resistor; r8-eighth resistor; r9-ninth resistance; r10-tenth resistor; r11-eleventh resistor; r12-twelfth resistor; r13-thirteenth resistance; r14-fourteenth resistors; r15-fifteenth resistor; r16-sixteenth resistance; r17-seventeenth resistance; r18-eighteenth resistor; r19-nineteenth resistance; r20-twentieth resistance; r21-twenty-first resistance; r22-a twenty-second resistor; r23-twenty-third resistors; r24-twenty-fourth resistors; c1-a first capacitance; c2-a second capacitance; a C3-third capacitor; c4-fourth capacitance; c5-fifth capacitance; c6-sixth capacitance; c7-seventh capacitance; c8-eighth capacitance; c9_ninth capacitance; d1-a first diode; d2—a second diode; d3-a third diode; d4—fourth diode; d5—fifth diode; d6-sixth diode; d7-seventh diode; d8-eighth diode; d9—ninth diode; d10—twelfth pole tube.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
as shown in figure 1, the double-isolation power amplifier circuit comprises an optical coupling isolation circuit, a logic control circuit, an H-bridge driving circuit, an H-bridge circuit, a power supply circuit and an overvoltage and overcurrent protection circuit; the optical coupling isolation circuit is connected with the input end of the H bridge driving circuit through the logic control circuit; the output end of the H-bridge driving circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge driving circuit and the H-bridge circuit respectively; and the output end of the H bridge circuit is connected with the overvoltage and overcurrent protection circuit.
As shown in fig. 2, specifically, the logic control circuit includes a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a fourth current limiting resistor, a first triode, a second triode, a third triode, a fourth triode, a first anti-reverse-irrigation power supply circuit, a second anti-reverse-irrigation power supply circuit, a third anti-reverse-irrigation power supply circuit, and a fourth anti-reverse-irrigation power supply circuit;
the first output end of the optocoupler isolation circuit is connected with the base electrode of the first triode through a first current limiting resistor; the second output end of the optocoupler isolation circuit is connected with the base electrode of the second triode through a second current limiting resistor; the collector electrode of the second triode is connected with the base electrode of the third triode through a third current limiting resistor; the second output end of the optocoupler isolation circuit is connected with the base electrode of the fourth triode through a fourth current limiting resistor; the second output end of the optical coupling isolation circuit is connected with the third input end of the H bridge driving circuit; the collector electrode of the first triode is connected with the first output end of the first anti-reverse-filling power supply circuit, the first output end of the second anti-reverse-filling power supply circuit and one end of the fourth current limiting resistor far away from the base electrode of the fourth diode; the collector electrode of the second triode is connected with the second output end of the first anti-reverse-filling power supply circuit, the second output end of the second anti-reverse-filling power supply circuit and one end of the third resistor far away from the base electrode of the third triode;
the third output end of the first anti-reverse-filling power supply circuit is connected with the first input end of the H-bridge driving circuit; the third output end of the second anti-reverse-filling power supply circuit is connected with the first input end of the H-bridge driving circuit; the third output end of the third anti-reverse-filling power supply circuit is connected with the third input end of the H-bridge driving circuit; the third output end of the fourth anti-reverse-filling power supply circuit is connected with the fourth input end of the H-bridge driving circuit.
The first anti-reverse-irrigation power supply circuit, the second anti-reverse-irrigation power supply circuit, the third anti-reverse-irrigation power supply circuit and the fourth anti-reverse-irrigation power supply circuit comprise a +5V low-voltage direct current power supply, a divider resistor and two diodes; the +5V low-voltage direct current power supply is connected with the anodes of the two diodes through a voltage dividing resistor.
As shown in fig. 3, specifically, the H-bridge driving circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor; the output end of the power circuit is connected with the grid electrode of the first MOS tube and the output end of the isolation amplifying circuit through the first resistor; the output end of the power circuit is connected with the grid electrode of the second MOS tube and the output end of the isolation amplifying circuit through the second resistor; the output end of the power circuit is connected with the grid electrode of the third MOS tube and the output end of the isolation amplifying circuit through a seventh resistor; the output end of the power supply circuit is connected with the grid electrode of the fourth MOS tube and the output end of the isolation amplifying circuit through an eighth resistor; the output end of the power circuit is connected with the source electrode of the first MOS tube and the first input end of the H bridge circuit through a third resistor; the output end of the power circuit is connected with the source electrode of the second MOS tube and the second input end of the H bridge circuit through a fourth resistor; the output end of the power circuit is connected with the source electrode of the third MOS tube and the third input end of the H bridge circuit through a fifth resistor; the output end of the power supply circuit is connected with the grid electrode of the fourth MOS tube through a sixth resistor; the drains of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube are grounded.
As shown in fig. 4, specifically, the H-bridge circuit includes a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; the first input end of the H bridge circuit is connected with the grid electrode of the fifth MOS tube through a ninth resistor; the second input end of the H bridge circuit is connected with the grid electrode of the sixth MOS tube through a tenth resistor; the third input end of the H bridge circuit is connected with the grid electrode of the seventh MOS tube through an eleventh resistor; the fourth input end of the H bridge circuit is connected with the grid electrode of the eighth MOS tube through a twelfth resistor; the output end of the power supply circuit is connected with the sources of the fifth MOS tube, the sixth MOS tube, the seventh MOS tube and the eighth MOS tube, the first diode, the second diode, the third diode, the cathode of the fourth diode, the first end of the thirteenth resistor, the first end of the second capacitor, the first end of the fifteenth resistor and the first end of the fourth capacitor; the second end of the thirteenth resistor is connected with the drain electrode of the fifth MOS tube, the anode of the first diode, the first end of the seventeenth resistor and the first output end of the H bridge circuit through the first capacitor; the second end of the second capacitor is connected with the drain electrode of the sixth MOS tube, the anode of the second diode, the first end of the eighteenth resistor and the first output end of the H bridge circuit through the second capacitor; the second end of the fifteenth resistor is connected with the drain electrode of the seventh MOS tube, the anode of the third diode, the cathode of the fifth diode and the second output end of the H bridge circuit through a third capacitor; the second end of the fourth capacitor is connected with the drain electrode of the seventh MOS tube, the anode of the third diode, the anode of the sixth diode and the second output end of the H bridge circuit through the fourth capacitor; the anode of the fifth diode is connected with the second end of the seventeenth resistor; the negative electrode of the sixth diode is connected with the second end of the eighteenth resistor.
In an H-bridge circuit, the upward freewheeling of the diode serves to prevent the load voltage from being higher than the supply voltage, and the downward freewheeling of the diode serves to prevent the load voltage from being lower than the supply ground voltage. The capacitor resistor flywheel voltage stabilizing circuit can prevent the load voltage from generating instant spike voltage, and simultaneously prevent the load voltage from being higher than the power supply voltage and lower than the power supply ground voltage.
As shown in fig. 5, specifically, the over-voltage and over-current protection circuit includes a ninth MOS transistor, a first operational amplifier, a second operational amplifier, a seventh diode of a third operational amplifier, an eighth diode, a ninth diode, a +5v dc power supply circuit, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a twenty-fourth resistor; the +5V direct current power supply circuit comprises a +5V direct current power supply, a nineteenth resistor and a twentieth resistor; the +5V direct current power supply is connected with the first end of the nineteenth resistor; the nineteenth resistor is connected with the output end of the +5V direct current power supply circuit and the first end of the twentieth resistor; the second end of the twentieth resistor is grounded; the output end of the H bridge circuit is connected with the source electrode of the ninth MOS tube; the +5V direct current power supply is connected with the grid electrode of the ninth MOS tube, the anode of the seventh diode, the anode of the eighth diode and the anode of the ninth diode through a twenty-third resistor; the drain electrode of the ninth MOS tube is connected with the reverse input end of the first operational amplifier; the homodromous input end of the first operational amplifier is connected with the output end of the +5V direct current power supply circuit; the output end of the first operational amplifier is connected with the cathode of the seventh diode; the output end of the second operational amplifier is connected with the cathode of the eighth diode; the output end of the third operational amplifier is connected with the cathode of the ninth diode; the output end of the +5V direct current power supply circuit is connected with the reverse input end of the second operational amplifier and the same-direction input end of the third operational amplifier; the +5V direct current power supply is connected with the homodromous input end of the second operational amplifier and the first end of the twenty-first resistor through the twenty-fourth resistor; the second end of the twenty-first resistor is connected with the reverse input end of the third operational amplifier and the first end of the twenty-second resistor; the second end of the twenty-second resistor is grounded.
The overvoltage protection circuit can enable the load when the power supply voltage is greater than a predetermined voltage. The overvoltage protection circuit consists of two comparators and a plurality of resistors; the overcurrent protection circuit can enable the load when the load current is greater than a prescribed current. The overcurrent protection circuit is composed of a comparator and an AND gate circuit.
As shown in fig. 6, specifically, the power supply circuit includes an input power supply, a power supply reverse connection protection circuit, a surge voltage protection circuit and a power supply noise protection circuit; the power supply reverse connection protection circuit comprises a twelfth pole tube; the surge voltage protection circuit comprises a first direct current power supply, a fifth capacitor, a sixth capacitor, a TVS tube and an inductor; the power supply noise protection circuit comprises a seventh capacitor, an eighth capacitor and a ninth capacitor; the input power supply is connected with the second end of the fifth capacitor, the first end of the sixth capacitor, the second end of the ninth capacitor, the first end of the TVS tube and the first end of the inductor through a twelfth electrode; the second direct current power supply is connected with the second end of the inductor; the second end of the TVS tube is grounded; the output end of the direct current power supply is connected with the first end of the fifth capacitor; the second end of the sixth capacitor, the first end of the seventh capacitor and the first end of the eighth capacitor are grounded; the second end of the seventh capacitor is connected with the first end of the ninth capacitor.
The surge voltage protection circuit can ensure that the H-bridge driving voltage is stable when the power supply voltage has irregular waveform voltage and peak voltage, and mainly comprises an inductor, a bidirectional TVS (transient voltage suppression) tube, a pull-up capacitor and a pull-down capacitor. The power supply connection reverse protection circuit can prevent damage caused by the power supply connection reverse to the circuit. The power supply noise protection circuit can prevent power supply noise and environmental space electromagnetic waves from damaging the circuit.
Specifically, the optocoupler isolation circuit includes an optocoupler chip HCPL2630.
The working process of the utility model is as follows: the external pulse width modulation signal is changed into an A1 signal through an input optical coupler isolation circuit, and the optical coupler isolation circuit has the functions of signal isolation and anti-interference capability increase. The A1 signal is then passed through an AND gate and a NOT gate to change the A1 signal into the A2 signal and the B1 signal. The A2 signal and the B1 signal are respectively sent into two MOS tube driving circuits, the A2 signal is changed into an HH signal and an HL signal, the B1 signal is changed into an LH signal and an LL signal, wherein the HH signal and the HL signal are opposite in phase, and the LH signal and the LL signal are opposite in phase.
The working process is as follows: the external pulse width modulation signal is changed into an A1 signal through an input optical coupler circuit, and the optical coupler circuit has the functions of signal isolation and anti-interference capability increase; the A1 signal is changed into an A2 signal and a B1 signal through an AND gate and a NOT gate; the A2 signal and the B1 signal are respectively sent into two MOS tube driving circuits, the A2 signal is changed into an HH signal and an HL signal, the B1 signal is changed into an LH signal and an LL signal, wherein the HH signal and the HL signal are opposite in phase, and the LH signal and the LL signal are opposite in phase.
The back pressure can occur in the running process of the motor, the motor voltage can exceed the power supply voltage, and the positive end and the negative end of the motor of the H-bridge circuit adopt two follow current modes of upward follow current of a diode and downward follow current of the diode at the same time, so that the motor voltage can be prevented from exceeding the power supply voltage; in the H bridge circuit, the capacitor and the resistor are connected in series to realize follow current voltage stabilization, so that the influence of power supply fluctuation and an external magnetic field on the operation index of the motor can be prevented.
The utility model realizes the above purpose through the following technical scheme:
the positive end and the negative end of the H-bridge circuit motor adopt two freewheel modes of upward freewheel and downward freewheel of a diode at the same time, so that the motor voltage can be prevented from exceeding the power supply voltage; in the H bridge circuit, the capacitor and the resistor are connected in series to realize follow current voltage stabilization, so that the influence of power supply fluctuation and an external magnetic field on the operation index of the motor can be prevented.
In the circuit, the overvoltage and overcurrent protection circuit and the surge voltage protection circuit are arranged in the circuit, so that the reliability and the stability of the circuit are improved; the power supply noise protection circuit improves the anti-interference capability of the power supply noise, and the power supply anti-interference circuit is provided with the power supply anti-interference circuit, so that the power supply anti-interference can be prevented; the motor enabling circuit is arranged, so that abnormal working conditions of the motor can be processed.
The utility model has the advantages that:
1) The input and output are isolated by an optical coupler, so that the anti-interference capability of the circuit is enhanced; the method comprises the steps of carrying out a first treatment on the surface of the
2) The circuit is provided with an upward freewheeling diode and has the capability of eliminating the reverse voltage of the motor;
3) The circuit is provided with a downward freewheeling diode and has the capability of eliminating the reverse voltage of the motor;
4) The circuit has the functions of capacitor resistance follow current voltage stabilization and motor counter voltage and voltage surge elimination;
5) The circuit has an overvoltage protection function;
6) The circuit has an overcurrent protection function;
7) The circuit has a surge voltage protection function;
8) The circuit has the protection function of preventing power supply interference;
9) The circuit has a power supply noise protection function;
10 A circuit having an enable protection function.
The technical scheme of the utility model is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the utility model fall within the protection scope of the utility model.
Claims (7)
1. The double-isolation power amplifier circuit is characterized by comprising an optical coupling isolation circuit, a logic control circuit, an H-bridge driving circuit, an H-bridge circuit, a power supply circuit and an overvoltage and overcurrent protection circuit; the optical coupling isolation circuit is connected with the input end of the H bridge driving circuit through the logic control circuit; the output end of the H-bridge driving circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge driving circuit and the H-bridge circuit respectively; the output end of the H bridge circuit is connected with the overvoltage and overcurrent protection circuit;
the logic control circuit comprises a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a fourth current limiting resistor, a first triode, a second triode, a third triode, a fourth triode, a first reverse-irrigation prevention power supply circuit, a second reverse-irrigation prevention power supply circuit, a third reverse-irrigation prevention power supply circuit and a fourth reverse-irrigation prevention power supply circuit;
the first output end of the optocoupler isolation circuit is connected with the base electrode of the first triode through a first current limiting resistor; the second output end of the optocoupler isolation circuit is connected with the base electrode of the second triode through a second current limiting resistor; the collector electrode of the second triode is connected with the base electrode of the third triode through a third current limiting resistor; the second output end of the optocoupler isolation circuit is connected with the base electrode of the fourth triode through a fourth current limiting resistor; the second output end of the optical coupling isolation circuit is connected with the third input end of the H bridge driving circuit; the collector electrode of the first triode is connected with the first output end of the first anti-reverse-filling power supply circuit, the first output end of the second anti-reverse-filling power supply circuit and one end of the fourth current limiting resistor far away from the base electrode of the fourth diode; the collector electrode of the second triode is connected with the second output end of the first anti-reverse-filling power supply circuit, the second output end of the second anti-reverse-filling power supply circuit and one end of the third resistor far away from the base electrode of the third triode;
the third output end of the first anti-reverse-filling power supply circuit is connected with the first input end of the H-bridge driving circuit; the third output end of the second anti-reverse-filling power supply circuit is connected with the first input end of the H-bridge driving circuit; the third output end of the third anti-reverse-filling power supply circuit is connected with the third input end of the H-bridge driving circuit; the third output end of the fourth anti-reverse-filling power supply circuit is connected with the fourth input end of the H-bridge driving circuit.
2. The dual isolation power amplifier circuit of claim 1, wherein the first anti-reverse-filling power supply circuit, the second anti-reverse-filling power supply circuit, the third anti-reverse-filling power supply circuit and the fourth anti-reverse-filling power supply circuit each comprise a +5v low voltage direct current power supply, a voltage dividing resistor and two diodes; the +5V low-voltage direct current power supply is connected with the anodes of the two diodes through a voltage dividing resistor.
3. The dual-isolation power amplifier circuit of claim 1, wherein the H-bridge driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor; the output end of the power circuit is connected with the grid electrode of the first MOS tube and the output end of the isolation amplifying circuit through the first resistor; the output end of the power circuit is connected with the grid electrode of the second MOS tube and the output end of the isolation amplifying circuit through the second resistor; the output end of the power circuit is connected with the grid electrode of the third MOS tube and the output end of the isolation amplifying circuit through a seventh resistor; the output end of the power supply circuit is connected with the grid electrode of the fourth MOS tube and the output end of the isolation amplifying circuit through an eighth resistor; the output end of the power circuit is connected with the source electrode of the first MOS tube and the first input end of the H bridge circuit through a third resistor; the output end of the power circuit is connected with the source electrode of the second MOS tube and the second input end of the H bridge circuit through a fourth resistor; the output end of the power circuit is connected with the source electrode of the third MOS tube and the third input end of the H bridge circuit through a fifth resistor; the output end of the power supply circuit is connected with the grid electrode of the fourth MOS tube through a sixth resistor; the drains of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube are grounded.
4. The dual isolated power amplifier circuit of claim 1, wherein the H-bridge circuit comprises a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor; the first input end of the H bridge circuit is connected with the grid electrode of the fifth MOS tube through a ninth resistor; the second input end of the H bridge circuit is connected with the grid electrode of the sixth MOS tube through a tenth resistor; the third input end of the H bridge circuit is connected with the grid electrode of the seventh MOS tube through an eleventh resistor; the fourth input end of the H bridge circuit is connected with the grid electrode of the eighth MOS tube through a twelfth resistor; the output end of the power supply circuit is connected with the sources of the fifth MOS tube, the sixth MOS tube, the seventh MOS tube and the eighth MOS tube, the first diode, the second diode, the third diode, the cathode of the fourth diode, the first end of the thirteenth resistor, the first end of the second capacitor, the first end of the fifteenth resistor and the first end of the fourth capacitor; the second end of the thirteenth resistor is connected with the drain electrode of the fifth MOS tube, the anode of the first diode, the first end of the seventeenth resistor and the first output end of the H bridge circuit through the first capacitor; the second end of the second capacitor is connected with the drain electrode of the sixth MOS tube, the anode of the second diode, the first end of the eighteenth resistor and the first output end of the H bridge circuit through the second capacitor; the second end of the fifteenth resistor is connected with the drain electrode of the seventh MOS tube, the anode of the third diode, the cathode of the fifth diode and the second output end of the H bridge circuit through a third capacitor; the second end of the fourth capacitor is connected with the drain electrode of the seventh MOS tube, the anode of the third diode, the anode of the sixth diode and the second output end of the H bridge circuit through the fourth capacitor; the anode of the fifth diode is connected with the second end of the seventeenth resistor; the negative electrode of the sixth diode is connected with the second end of the eighteenth resistor.
5. The dual isolated power amplifier circuit of claim 1, wherein the over-voltage and over-current protection circuit comprises a ninth MOS transistor, a first operational amplifier, a second operational amplifier, a seventh diode, an eighth diode, a ninth diode, a +5v dc power supply circuit, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a twenty-fourth resistor; the +5V direct current power supply circuit comprises a +5V direct current power supply, a nineteenth resistor and a twentieth resistor; the +5V direct current power supply is connected with the first end of the nineteenth resistor; the nineteenth resistor is connected with the output end of the +5V direct current power supply circuit and the first end of the twentieth resistor; the second end of the twentieth resistor is grounded; the output end of the H bridge circuit is connected with the source electrode of the ninth MOS tube; the +5V direct current power supply is connected with the grid electrode of the ninth MOS tube, the anode of the seventh diode, the anode of the eighth diode and the anode of the ninth diode through a twenty-third resistor; the drain electrode of the ninth MOS tube is connected with the reverse input end of the first operational amplifier; the homodromous input end of the first operational amplifier is connected with the output end of the +5V direct current power supply circuit; the output end of the first operational amplifier is connected with the cathode of the seventh diode; the output end of the second operational amplifier is connected with the cathode of the eighth diode; the output end of the third operational amplifier is connected with the cathode of the ninth diode; the output end of the +5V direct current power supply circuit is connected with the reverse input end of the second operational amplifier and the same-direction input end of the third operational amplifier; the +5V direct current power supply is connected with the homodromous input end of the second operational amplifier and the first end of the twenty-first resistor through the twenty-fourth resistor; the second end of the twenty-first resistor is connected with the reverse input end of the third operational amplifier and the first end of the twenty-second resistor; the second end of the twenty-second resistor is grounded.
6. The dual isolation power amplifier circuit of claim 1, wherein said power supply circuit comprises an input power supply, a power supply reverse connection protection circuit, a surge voltage protection circuit and a power supply noise protection circuit; the power supply reverse connection protection circuit comprises a twelfth pole tube; the surge voltage protection circuit comprises a first direct current power supply, a fifth capacitor, a sixth capacitor, a zener diode and an inductor; the power supply noise protection circuit comprises a seventh capacitor, an eighth capacitor and a ninth capacitor; the input power supply is connected with the second end of the fifth capacitor, the first end of the sixth capacitor, the second end of the ninth capacitor, the first end of the zener diode and the first end of the inductor through a twelfth electrode; the second direct current power supply is connected with the second end of the inductor; the second end of the voltage stabilizing diode is grounded; the output end of the direct current power supply is connected with the first end of the fifth capacitor; the second end of the sixth capacitor, the first end of the seventh capacitor and the first end of the eighth capacitor are grounded; the second end of the seventh capacitor is connected with the first end of the ninth capacitor.
7. The dual isolation power amplifier circuit of claim 1, wherein the optocoupler isolation circuit comprises an optocoupler chip HCPL2630.
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| CN201393196Y (en) * | 2009-04-03 | 2010-01-27 | 华南理工大学 | Drive module for controlling industrial direct current motor by using an airplane model remote controller |
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