CN208572059U - A kind of isolated drive circuit - Google Patents
A kind of isolated drive circuit Download PDFInfo
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- CN208572059U CN208572059U CN201821273535.6U CN201821273535U CN208572059U CN 208572059 U CN208572059 U CN 208572059U CN 201821273535 U CN201821273535 U CN 201821273535U CN 208572059 U CN208572059 U CN 208572059U
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- resistance
- optocoupler
- triode
- driving
- voltage
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Abstract
The utility model discloses a kind of isolated drive circuit, the circuit including optocoupler U1, resistance R1, resistance R2, triode Q1 and triode Q2 composition is isolated drive circuit；The circuit that optocoupler U2, comparator U3A, comparator U3B, voltage-stabiliser tube D1, voltage-stabiliser tube D2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12 are formed is driving under-voltage protecting circuit；This product using light-coupled isolation drive, drive waveforms can 0-100% duty ratio it is adjustable, waveform is not easy to be distorted.Driving circuit is powered using isolated power supply, and driving power is big, can drive multiple switch pipe or high power module.When driving signal is under-voltage, it can be achieved that driving under-voltage protection, effectively prevents driving and under-voltage switching tube is caused to generate heat or bombing.
Description
Technical field
The utility model relates to power circuit technical field, specifically a kind of isolated drive circuit.
Background technique
Existing isolated drive circuit uses transformer isolation, and when duty ratio is greater than 50%, transformer needs magnetic reset,
Drive waveforms are easily distorted.Meanwhile existing isolated drive circuit does not have independent driving power, driving power is limited, can not drive
Dynamic multiple switch pipe or high power module.And existing isolated drive circuit cannot realize driving when driving signal is under-voltage
Under-voltage protection, can be because driving is under-voltage to cause switching tube fever or bombing.
Utility model content
The utility model aim is overcome the deficiencies in the prior art, adapts to realistic development, provides a kind of isolation drive electricity
Road.
In order to achieve the above objectives, the technical solution adopted in the utility model is as follows:
A kind of isolated drive circuit described in the utility model, including optocoupler U1, optocoupler U2, comparator U3A, comparator
U3B, voltage-stabiliser tube D1, voltage-stabiliser tube D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance
R8, resistance R9, resistance R10, resistance R11, resistance R12, triode Q1 and triode Q2；
The circuit that the optocoupler U1, resistance R1, resistance R2, triode Q1 and triode Q2 are formed is isolated drive circuit；
2 feet of the optocoupler U1 connect driving signal, and 3 feet of the optocoupler U1 connect the ground of driving input circuit power supply, described
8 feet of optocoupler U1 meet the power supply+15V of driving output circuit, and 5 feet of the optocoupler U1 meet the power supply -15V of driving output circuit,
6 feet of the optocoupler U1 connect one end of the resistance R1, the other end of the resistance R1 simultaneously respectively with the triode Q1 and
The base stage of the triode Q2 connects, and the collector of the triode Q1 meets+15V, and the collector of the triode Q2 meets -15V,
The emitter of the triode Q1, the triode Q2 emitter simultaneously connected with one end of the resistance R2, the resistance
The other end of R2 is exported as final driving, connection switch pipe or power module；
The optocoupler U2, comparator U3A, comparator U3B, voltage-stabiliser tube D1, voltage-stabiliser tube D2, resistance R3, resistance R4, resistance
The circuit that R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12 are formed is to drive under-voltage guarantor
Protection circuit；
A termination+15V of the resistance R3, the other end connect the cathode and the comparator of the voltage-stabiliser tube D1 simultaneously
2 feet of U3A, a termination+15V of the resistance R4, the other end connect the 3 of the resistance R5, resistance R6 and comparator U3A simultaneously
The anode of foot, the other end of the resistance R5 and the voltage-stabiliser tube D1 connect the ground of driving power, another termination of the resistance R6
The resistance R7, resistance R12,1 foot of comparator U3A and comparator U3B 7 feet, another termination light of the resistance R7
2 feet of coupling U2,1 foot of the optocoupler U2 meet the resistance R8, another termination+15V of the resistance R8；
A termination -15V of the resistance R11, another 5 feet for terminating the resistance R12, resistance R10 and comparator U3B,
The ground of another termination driving power of the resistance R10, the anode of the voltage-stabiliser tube D2 connect -15V, the cathode of the voltage-stabiliser tube D2
Meet 6 feet of the resistance R9 and the comparator U3B, the ground of another termination driving power of the resistance R9, the optocoupler U2
3 feet connect the ground of driving input power, the output of 4 feet of the optocoupler U2 as the under-voltage signal of driving.
Further, the triode Q1 is NPN type, and the triode Q2 is positive-negative-positive.
The advantages of the utility model and good effect:
This product using light-coupled isolation drive, drive waveforms can 0-100% duty ratio it is adjustable, waveform is not easy to be distorted.Driving
Circuit is powered using isolated power supply, and driving power is big, can drive multiple switch pipe or high power module.It is under-voltage in driving signal
When, it can be achieved that driving under-voltage protection, effectively prevent driving and under-voltage switching tube caused to generate heat or bombing.
Detailed description of the invention
Fig. 1 is isolation drive and power amplification circuit figure；
Fig. 2 drives undervoltage detection circuit figure.
Specific embodiment
It is necessary to understand that, "upper", "lower", "top", "bottom", "inner", "outside" etc. refer in the description of the present invention,
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings, target only the utility model for ease of description
It is described with simplifying, is not that indication or suggestion institute finger must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it should not be understood as limiting the present invention.
It elaborates with reference to the accompanying drawing to specific embodiment of the utility model.
A kind of isolated drive circuit, as shown in Figs. 1-2, including it is optocoupler U1, optocoupler U2, comparator U3A, comparator U3B, steady
Pressure pipe D1, voltage-stabiliser tube D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance
R9, resistance R10, resistance R11, resistance R12, NPN type triode Q1 and PNP type triode Q2；
The circuit that the optocoupler U1, resistance R1, resistance R2, triode Q1 and triode Q2 are formed is isolated drive circuit；
2 feet of the optocoupler U1 connect driving signal, and 3 feet of the optocoupler U1 connect the ground of driving input circuit power supply, described
8 feet of optocoupler U1 meet the power supply+15V of driving output circuit, and 5 feet of the optocoupler U1 meet the power supply -15V of driving output circuit,
6 feet of the optocoupler U1 connect one end of the resistance R1, the other end of the resistance R1 simultaneously respectively with the triode Q1 and
The base stage of the triode Q2 connects, and the collector of the triode Q1 meets+15V, and the collector of the triode Q2 meets -15V,
The emitter of the triode Q1, the triode Q2 emitter simultaneously connected with one end of the resistance R2, the resistance
The other end of R2 is exported as final driving, connection switch pipe or power module；
Driving signal is inputted from 2 feet of the optocoupler U1, Phototube Coupling is realized by the optocoupler U1, from the optocoupler U1
6 feet output, by the power amplification of the resistance R1, triode Q1, triode Q2, finally from the resistance R2 output driving
Switching tube or power module.
Since the input circuit power supply of the optocoupler U1 and the optocoupler U1 output circuit power supply are completely isolated,
It is achieved that driving is completely isolated.
The optocoupler U2, comparator U3A, comparator U3B, voltage-stabiliser tube D1, voltage-stabiliser tube D2, resistance R3, resistance R4, resistance
The circuit that R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12 are formed is to drive under-voltage guarantor
Protection circuit；
A termination+15V of the resistance R3, the other end connect the cathode and the comparator of the voltage-stabiliser tube D1 simultaneously
2 feet of U3A, a termination+15V of the resistance R4, the other end connect the 3 of the resistance R5, resistance R6 and comparator U3A simultaneously
The anode of foot, the other end of the resistance R5 and the voltage-stabiliser tube D1 connect the ground of driving power, another termination of the resistance R6
The resistance R7, resistance R12,1 foot of comparator U3A and comparator U3B 7 feet, another termination light of the resistance R7
2 feet of coupling U2,1 foot of the optocoupler U2 meet the resistance R8, another termination+15V of the resistance R8；
A termination -15V of the resistance R11, another 5 feet for terminating the resistance R12, resistance R10 and comparator U3B,
The ground of another termination driving power of the resistance R10, the anode of the voltage-stabiliser tube D2 connect -15V, the cathode of the voltage-stabiliser tube D2
Meet 6 feet of the resistance R9 and the comparator U3B, the ground of another termination driving power of the resistance R9, the optocoupler U2
3 feet connect the ground of driving input power, the output of 4 feet of the optocoupler U2 as the under-voltage signal of driving.
When+the 15V of driving power it is relatively low to certain value when, the voltage after the resistance R4, resistance R5 partial pressure can be inclined
Low, so the 3 foot voltages of comparator U3A can be lower than the 2 foot voltages of comparator U3A, therefore 1 foot of comparator U3A exports low electricity
It is flat, the LEDs ON of the optocoupler U2 is triggered, so that control circuit be transmitted to after under-voltage signal isolation will be driven, is controlled
Circuit closes driving, realizes driving under-voltage protection.
When driving power -15V it is relatively low to certain value when, the voltage after the resistance R11, resistance R10 partial pressure can be inclined
Low, so the 5 foot voltages of comparator U3B can be lower than the 6 foot voltages of comparator U3B, therefore 7 feet of comparator U3B export low electricity
It is flat, the LEDs ON of the optocoupler U2 is triggered, so that control circuit be transmitted to after under-voltage signal isolation will be driven, is controlled
Circuit closes driving, realizes driving under-voltage protection.
Above-described embodiment is only the more excellent embodiment of the utility model, all according to the technical essence of the utility model pair
Any simple modification, modification and alternate variation made for any of the above embodiments, are all within the scope of the technical scheme of the utility model.
Claims (2)
1. a kind of isolated drive circuit, it is characterised in that: including optocoupler U1, optocoupler U2, comparator U3A, comparator U3B, pressure stabilizing
Pipe D1, voltage-stabiliser tube D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9,
Resistance R10, resistance R11, resistance R12, triode Q1 and triode Q2；
The circuit that the optocoupler U1, resistance R1, resistance R2, triode Q1 and triode Q2 are formed is isolated drive circuit；
2 feet of the optocoupler U1 connect driving signal, and 3 feet of the optocoupler U1 connect the ground of driving input circuit power supply, the optocoupler
8 feet of U1 meet the power supply+15V of driving output circuit, and 5 feet of the optocoupler U1 meet the power supply -15V of driving output circuit, described
6 feet of optocoupler U1 connect one end of the resistance R1, the other end of the resistance R1 simultaneously respectively with the triode Q1 and described
The base stage of triode Q2 connects, and the collector of the triode Q1 meets+15V, and the collector of the triode Q2 meets -15V, described
The emitter of triode Q1, the triode Q2 emitter simultaneously connected with one end of the resistance R2, the resistance R2's
The other end is exported as final driving, connection switch pipe or power module；
The optocoupler U2, comparator U3A, comparator U3B, voltage-stabiliser tube D1, voltage-stabiliser tube D2, resistance R3, resistance R4, resistance R5, electricity
It is electric for driving under-voltage protection to hinder R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, the circuit of resistance R12 composition
Road；
A termination+15V of the resistance R3, the other end simultaneously connect the voltage-stabiliser tube D1 cathode and the comparator U3A 2
Foot, a termination+15V of the resistance R4, the other end connect 3 feet of the resistance R5, resistance R6 and comparator U3A, institute simultaneously
The anode of the other end and the voltage-stabiliser tube D1 of stating resistance R5 connects the ground of driving power, another termination electricity of the resistance R6
Hinder R7, resistance R12,1 foot of comparator U3A and comparator U3B 7 feet, the 2 of another termination of resistance R7 optocoupler U2
Foot, 1 foot of the optocoupler U2 meet the resistance R8, another termination+15V of the resistance R8；
A termination -15V of the resistance R11, another 5 feet for terminating the resistance R12, resistance R10 and comparator U3B are described
The ground of another termination driving power of resistance R10, the anode of the voltage-stabiliser tube D2 meet -15V, and the cathode of the voltage-stabiliser tube D2 meets institute
State 6 feet of resistance R9 and the comparator U3B, the ground of another termination driving power of the resistance R9,3 feet of the optocoupler U2
The ground of driving input power is connect, 4 feet of the optocoupler U2 are as the output for driving under-voltage signal.
2. a kind of isolated drive circuit according to claim 1, it is characterised in that: the triode Q1 is NPN type, described
Triode Q2 is positive-negative-positive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821273535.6U CN208572059U (en) | 2018-08-08 | 2018-08-08 | A kind of isolated drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821273535.6U CN208572059U (en) | 2018-08-08 | 2018-08-08 | A kind of isolated drive circuit |
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| Publication Number | Publication Date |
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| CN208572059U true CN208572059U (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821273535.6U Active CN208572059U (en) | 2018-08-08 | 2018-08-08 | A kind of isolated drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024114096A1 (en) * | 2022-11-29 | 2024-06-06 | 浙江迪谱诊断技术有限公司 | Self-recovery high-voltage pulse driver |
-
2018
- 2018-08-08 CN CN201821273535.6U patent/CN208572059U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024114096A1 (en) * | 2022-11-29 | 2024-06-06 | 浙江迪谱诊断技术有限公司 | Self-recovery high-voltage pulse driver |
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