CN212723017U - Voltage power amplification module for relay protection tester - Google Patents
Voltage power amplification module for relay protection tester Download PDFInfo
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- CN212723017U CN212723017U CN202021224371.5U CN202021224371U CN212723017U CN 212723017 U CN212723017 U CN 212723017U CN 202021224371 U CN202021224371 U CN 202021224371U CN 212723017 U CN212723017 U CN 212723017U
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- 230000003321 amplification Effects 0.000 title claims abstract description 26
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 26
- 230000000295 complement effect Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model provides a voltage power amplification module for relay protection tester, including leading input stage, complementary intermediate level and power output level, power output level includes MOS pipe T1, MOS pipe T2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R8, triode Q1, triode Q2 and comparator U1. The utility model discloses a power output level is on traditional hot cut-off protection circuit's basis, converts the slow voltage signal of change speed that sampling current generated on resistance R3 into the fast voltage signal of change speed through the mirror image source, exports for comparator U1, makes comparator work in the small signal mode, has reduced the time delay, and hot cut-off protection is more timely.
Description
Technical Field
The utility model relates to a relay protection tester technical field especially relates to a voltage power amplification module for relay protection tester.
Background
The relay protection tester is an intelligent power device, can identify various relays (such as current, impedance and differential) and microcomputer protection, and can simulate various complex transient and permanent faults for testing. The tester can generate various voltage, current, phase and frequency signals required by protection according to experimental requirements. The relay protection tester mainly comprises a host communication unit, a digital signal generation unit, a logic control unit, a D/A conversion unit, a power amplification unit, an input/output unit and the like. The power amplification unit comprises a voltage power amplification part and a current power amplification part, and the voltage power amplification part and the current power amplification part respectively amplify the analog small signals further to obtain various alternating current/direct current voltage/current signals required by the relay protection test.
The voltage power amplification part of the relay protection tester generally comprises a pre-input stage, a complementary intermediate stage and a power output stage, wherein the power output stage is generally formed by MOS (metal oxide semiconductor) tubes, and the MOS tubes are required to be subjected to thermal cut-off protection because a voltage output short circuit can occur in a circuit under certain environments. In the traditional thermal cut-off protection, a resistor is connected in series with a drain electrode or a source electrode of an MOS (metal oxide semiconductor) tube, if the output voltage of the MOS tube is overlarge, voltage drops generated on the resistor by positive or negative half-cycle current are respectively sent to two comparators to output a trigger signal, and a control transistor drives a solid-state relay to cut off a power supply and drives a buzzer to give an alarm. Because the voltage changes slowly on the resistor, the time delay of the comparator is larger, and the thermal cut-off protection of the MOS tube is not timely.
SUMMERY OF THE UTILITY MODEL
In view of this the utility model provides a voltage power amplification module for relay protection tester to solve traditional voltage power amplification module for relay protection tester hot cut-off protection untimely problem.
The technical scheme of the utility model is realized like this: a voltage power amplification module for a relay protection tester comprises a preposed input stage, a complementary intermediate stage and a power output stage, wherein the power output stage comprises an MOS tube T1, an MOS tube T2, a resistor R1 and a resistor R2, a power supply + Vcc is connected with a drain electrode of the MOS tube T1, a source electrode of the MOS tube T1 is connected with a drain electrode of the MOS tube T2 through the resistor R1 and the resistor R2 in sequence, and the power supply-Vcc is connected with a source electrode of the MOS tube T2;
the power output stage further comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a triode Q1, a triode Q2 and a comparator U1;
a resistor R3 is connected in series between a resistor R1 and a resistor R2, the common end of the resistor R2 and the resistor R3 is connected with a load, a power supply + Vcc is connected with the collector of a triode Q1 through a resistor R4, the emitter of a triode Q1 is grounded through a resistor R5, the common end of a resistor R1 and a resistor R3 is connected with the emitter of a triode Q1, the collector of the triode Q1 is also connected with the base of a triode Q1, and the base of the triode Q1 is also connected with the base of a triode Q2;
the power supply + Vcc is connected with the collector of the triode Q2 through a resistor R6, the emitter of the triode Q2 is grounded, the collector of the triode Q2 is also connected with the inverting input end of a comparator U1 through a resistor R8, the non-inverting input end of the comparator U1 is connected with reference voltage, and the output end of the comparator U1 is connected with the solid-state relay drive of the relay protection tester.
Optionally, the power output stage further includes a diode D1, the diode D1 is connected between the common end of the resistors R1 and R3 and the emitter of the transistor Q1, and the common end of the resistors R1 and R3 is connected to the emitter of the transistor Q1 through the anode of the diode D1 and the cathode of the diode D1 in sequence.
Optionally, the power output stage further includes a resistor R7, the resistor R7 is connected between the resistor R6 and the collector of the transistor Q2, and a common end of the resistor R6 and the resistor R7 is connected to the inverting input terminal of the comparator U1 through a resistor R8.
Optionally, the pre-input stage includes an operational amplifier U2, a resistor R9, a resistor R10, a resistor R11, and a resistor R12;
the common end of the resistor R2 and the resistor R3 is also connected with the inverting input end of the operational amplifier U2 through a resistor R11, the common end of the resistor R11 and the inverting input end of the operational amplifier U2 is grounded through a resistor R12, the non-inverting input end of the operational amplifier U2 is grounded through a resistor R10 and a resistor R9 in sequence, the common end of the resistor R10 and the resistor R9 is connected with an analog small signal generated in a relay protection tester, and the output end of the operational amplifier U2 is connected with the input end of a complementary middle stage.
Optionally, the pre-input stage further includes a capacitor C1, and the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the capacitor C1.
Optionally, the pre-input stage further includes a voltage follower U3, and the voltage follower U3 is connected between the common terminal of the resistors R2 and R3 and the resistor R11.
The utility model discloses a voltage power amplification module has following beneficial effect for prior art:
(1) the utility model discloses a power output stage is on the basis of traditional hot protective circuit that cuts off, and the voltage signal that the change rate that will sample the electric current and generate on resistance R3 through the mirror image source is slow converts the voltage signal that the change rate is fast into, exports to comparator U1, makes comparator work in the small signal mode, has reduced the time delay, and hot cut-off protection is more timely;
(2) the utility model discloses a leading input stage is at parallelly connected leading phase compensation electric capacity C1 in feedback resistance R11 both ends, can prevent that the circuit from producing the oscillation and suppressing the total harmonic volume of signal, and voltage follower U3 can enlarge the electric current of leading input stage input, improves the ability of triode in the complementary intermediate level of drive.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a voltage power amplifier module according to the present invention;
fig. 2 is a circuit diagram of the voltage power amplifying module of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the voltage power amplification module for the relay protection tester of this embodiment includes a pre-input stage, a complementary intermediate stage, and a power output stage, as shown in fig. 2, the power output stage includes a MOS transistor T1, a MOS transistor T2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a diode D1, an NPN triode Q1, an NPN triode Q2, and a comparator U1, a power supply + Vcc is connected to a drain of the MOS transistor T1, a source of the MOS transistor T1 is connected to a drain of the MOS transistor T2 through the resistor R1 and the resistor R2 in sequence, and the power supply-Vcc is connected to a source of the MOS transistor T2; a resistor R3 is connected in series between a resistor R1 and a resistor R2, the common end of the resistor R2 and the resistor R3 is connected with a load, a power supply + Vcc is connected with the collector of a triode Q1 through a resistor R4, the emitter of the triode Q1 is grounded through a resistor R5, the common end of a resistor R1 and the resistor R3 is sequentially connected with the emitter of a triode Q1 through the anode of a diode D1 and the cathode of the diode D1, the collector of the triode Q1 is also connected with the base of a triode Q1, and the base of the triode Q1 is also connected with the base of a triode Q2; the power supply + Vcc is also connected with the collector of the triode Q2 through a resistor R6 and a resistor R7 in sequence, the emitter of the triode Q2 is grounded, the common end of the resistor R6 and the resistor R7 is connected with the inverting input end of the comparator U1 through a resistor R8, the non-inverting input end of the comparator U1 is connected with reference voltage, and the output end of the comparator U1 is connected with the solid-state relay drive of the relay protection tester.
MOS transistor T1, MOS transistor T2, resistor R1 and resistor R2 constitute a traditional power output stage. In this embodiment, in a normal state, the transistor Q2 is in a cut-off state, if a voltage output short circuit occurs in the power output stage, the power supply voltage is directly applied to the MOS transistor T1 or the MOS transistor T2, taking the MOS transistor T1 as an example, at this time, the current flowing through the resistor R3 becomes large, the voltage at both ends of the resistor R3 rises, that is, the voltage at the point a in fig. 1 rises to the point b through the diode D1, the potential at the point b rises, the base potentials of the transistor Q1 and the transistor Q2 rise, as the potential of the base rises, the transistor Q2 rapidly enters a saturation state from the cut-off state through the amplification state from the cut-off state, the transistor Q2 is almost completely turned on, the potential at the point c rapidly drops to be less than the reference voltage, the comparator U1 outputs a high level control transistor to drive the solid-state relay to cut off the power supply and drive the buzzer to alarm, so that the thermal cut-off protection of, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the NPN triode Q1 and the NPN triode Q2 form a mirror source circuit, a voltage signal with low change speed generated by sampling current on the resistor R3 is converted into a voltage signal with high change speed, and the voltage signal is output to the comparator U1, so that the comparator works in a small signal mode, time delay is reduced, and thermal cut-off protection is more timely. The diode D1 is used for ensuring unidirectional current flow, the resistor R7 is used for accelerating the transistor Q2 to enter a saturation region, the voltage dropping speed at the point c is improved, and the resistor R8 is used for limiting current.
In this embodiment, the above hot-switching protection circuit may be further added to the source of the MOS transistor T2, and the structure and principle thereof are basically the same, so that the hot-switching protection circuit is used for performing hot-switching protection on the MOS transistor T2, and a specific circuit is not given here.
Further, as shown in fig. 2, the pre-input stage includes an operational amplifier U2, a voltage follower U3, a capacitor C1, a resistor R9, a resistor R10, a resistor R11, and a resistor R12; the common end of the resistor R2 and the resistor R3 is also connected with the inverting input end of an operational amplifier U2 through a voltage follower U3 and a resistor R11 in sequence, the common end of the resistor R11 and the inverting input end of the operational amplifier U2 is grounded through a resistor R12, the non-inverting input end of the operational amplifier U2 is grounded through a resistor R10 and a resistor R9 in sequence, the common end of the resistor R10 and the resistor R9 is connected with an analog small signal generated in a relay protection tester, the output end of the operational amplifier U2 is connected with the input end of a complementary intermediate stage, and the output end of the operational amplifier U2 is also connected with the inverting input end of the operational amplifier U2 through a capacitor C1.
The pre-input stage has a buffering effect on input analog small signals, the output of the whole voltage power amplification module is led to the inverting input end of an operational amplifier U2 through voltage series negative feedback, the voltage amplification factor of the pre-input stage is 1+ R11/R12, the voltage output is controlled to be proportional to the voltage input, and the open loop gain of the operational amplifier can compensate the non-ideality on the load. In this embodiment, two ends of the feedback resistor R11 are connected in parallel with a leading phase compensation capacitor C1, which can prevent the circuit from generating oscillation and suppress the total harmonic amount of the signal, and the voltage follower U3 can amplify the current input by the pre-input stage, thereby improving the ability of driving the transistor in the complementary intermediate stage.
As shown in FIG. 2, the complementary intermediate stage comprises an NPN triode Q, a PNP triode Q, an NPN triode Q, a diode D and a resistor R-R, wherein the power supply + Vcc is sequentially connected with the power supply-Vcc through the resistor R, the anode of the diode D, the cathode of the diode D and the resistor R, the power supply + Vcc is also sequentially connected with the power supply-Vcc through the resistor R, the collector of the triode Q, the emitter of the triode Q, the resistor R, the emitter of the resistor R, the collector of the triode Q and the resistor R, the emitter of the triode Q and the resistor R, the collector of the triode Q, the resistor R, the collector of the triode Q, the emitter of the triode Q and the resistor R are sequentially connected with the power supply-Vcc through the resistor R, the base of the triode Q is connected with the common end of the anode of the diode D, the base of the, the collector of the triode Q3 is further connected with the base of the triode Q5 through a resistor R19, the collector of the triode Q4 is further connected with the base of the triode Q6 through a resistor R20, the common end of the resistor R16 and the resistor R17 is connected with the common end of the resistor R23 and the resistor R24 through a resistor R21, the common end of the resistor R2 and the resistor R3, the collector of the triode Q5 is further connected with the gate of the MOS transistor T1 through a resistor R26, and the emitter of the triode Q6 is further connected with the gate of the MOS transistor T2 through a resistor R27.
In the voltage power amplification module, when an input signal is in a positive half cycle, a triode Q3, a triode Q5 and an MOS (metal oxide semiconductor) tube T1 are switched on, and a triode Q4, a triode Q6 and an MOS tube T2 are switched off; when the input signal is in the negative half cycle, the triode Q3, the triode Q5 and the MOS tube T1 are cut off, and the triode Q4, the triode Q6 and the MOS tube T2 are conducted. The upper and lower circuits are conducted in turn and work complementarily to form a push-pull complementary symmetrical amplifying circuit, and a complete waveform is synthesized at the output end.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a relay protection is voltage power amplification module for tester, including leading input stage, complementary intermediate level and power output level, power output level includes MOS pipe T1, MOS pipe T2, resistance R1 and resistance R2, MOS pipe T1's drain electrode is connected to power + Vcc, MOS pipe T1's source electrode is in proper order through resistance R1, resistance R2 connection MOS pipe T2's drain electrode, MOS pipe T2's source electrode is connected to power-Vcc, a serial communication port, its characterized in that:
the power output stage further comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a triode Q1, a triode Q2 and a comparator U1;
a resistor R3 is connected in series between a resistor R1 and a resistor R2, the common end of the resistor R2 and the resistor R3 is connected with a load, a power supply + Vcc is connected with the collector of a triode Q1 through a resistor R4, the emitter of a triode Q1 is grounded through a resistor R5, the common end of a resistor R1 and a resistor R3 is connected with the emitter of a triode Q1, the collector of the triode Q1 is also connected with the base of a triode Q1, and the base of the triode Q1 is also connected with the base of a triode Q2;
the power supply + Vcc is connected with the collector of the triode Q2 through a resistor R6, the emitter of the triode Q2 is grounded, the collector of the triode Q2 is also connected with the inverting input end of a comparator U1 through a resistor R8, the non-inverting input end of the comparator U1 is connected with reference voltage, and the output end of the comparator U1 is connected with the solid-state relay drive of the relay protection tester.
2. The voltage power amplification module for the relay protection tester as claimed in claim 1, wherein the power output stage further comprises a diode D1, the diode D1 is connected between the common terminal of the resistors R1 and R3 and the emitter of the transistor Q1, and the common terminal of the resistors R1 and R3 is connected to the emitter of the transistor Q1 through the anode of the diode D1 and the cathode of the diode D1 in sequence.
3. The voltage power amplification module for the relay protection tester as claimed in claim 1, wherein the power output stage further comprises a resistor R7, the resistor R7 is connected between the resistor R6 and the collector of the transistor Q2, and a common terminal of the resistor R6 and the resistor R7 is connected to the inverting input terminal of the comparator U1 through a resistor R8.
4. The voltage power amplification module for the relay protection tester as claimed in claim 1, wherein the pre-input stage comprises an operational amplifier U2, a resistor R9, a resistor R10, a resistor R11 and a resistor R12;
the common end of the resistor R2 and the resistor R3 is also connected with the inverting input end of the operational amplifier U2 through a resistor R11, the common end of the resistor R11 and the inverting input end of the operational amplifier U2 is grounded through a resistor R12, the non-inverting input end of the operational amplifier U2 is grounded through a resistor R10 and a resistor R9 in sequence, the common end of the resistor R10 and the resistor R9 is connected with an analog small signal generated in a relay protection tester, and the output end of the operational amplifier U2 is connected with the input end of a complementary middle stage.
5. The voltage power amplification module for relay protection tester as claimed in claim 4, wherein the pre-input stage further comprises a capacitor C1, and the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 via the capacitor C1.
6. The voltage power amplification module for the relay protection tester as claimed in claim 4, wherein the pre-input stage further comprises a voltage follower U3, and the voltage follower U3 is connected between the common terminal of the resistors R2 and R3 and the resistor R11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021224371.5U CN212723017U (en) | 2020-06-29 | 2020-06-29 | Voltage power amplification module for relay protection tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021224371.5U CN212723017U (en) | 2020-06-29 | 2020-06-29 | Voltage power amplification module for relay protection tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212723017U true CN212723017U (en) | 2021-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021224371.5U Expired - Fee Related CN212723017U (en) | 2020-06-29 | 2020-06-29 | Voltage power amplification module for relay protection tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212723017U (en) |
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2020
- 2020-06-29 CN CN202021224371.5U patent/CN212723017U/en not_active Expired - Fee Related
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Granted publication date: 20210316 |
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| CF01 | Termination of patent right due to non-payment of annual fee |