CN100345361C - Isolation voltage regulation circuit regulated by pulse wide of single-chip machine - Google Patents
Isolation voltage regulation circuit regulated by pulse wide of single-chip machine Download PDFInfo
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- CN100345361C CN100345361C CNB200510024282XA CN200510024282A CN100345361C CN 100345361 C CN100345361 C CN 100345361C CN B200510024282X A CNB200510024282X A CN B200510024282XA CN 200510024282 A CN200510024282 A CN 200510024282A CN 100345361 C CN100345361 C CN 100345361C
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Abstract
The present invention relates to an isolation voltage regulation circuit modulated by the pulse width of a single-chip machine. A power supply of a single-chip machine is added on an anode of an isolation optical coupling luminous diode by a current limit resistor; the cathode of the isolation optical coupling luminous diode is connected with a collecting electrode of an optical coupling drive triode; the output of a pulse width modulation waveform of the single-chip machine is connected with a base resistor of the optical coupling drive triode; an emitting electrode of the optical coupling drive triode is connected with the power supply ground of the single-chip machine; the collecting electrode of an isolation optical coupling secondary edge is connected with a drive power supply of a constant current module thyristor by a voltage separating resistor; after being connected with a filtering circuit, the emitting electrode of the optical coupling secondary edge is outputted. After optical coupling isolation is carried out on the pulse width modulation waveform emitted by the single-chip machine of the present invention, the pulse width modulation waveform is filtered. Consequently, changed direct current voltage isolated from a single-chip machine system is obtained; the changed direct current voltage is used for controlling the constant current thyristor. Thereby, the present invention ensures the working stability of the single-chip machine.
Description
Technical field
The present invention relates to a kind of isolation voltage regulating circuit based on single-chip microcomputer pulse width modulation, send PWM (pulse width modulation) voltage signal of change in duty cycle by single-chip microcomputer, the direct voltage that utilizes filtering technique to obtain changing is again controlled the thyristor angle of flow.Belong to thyristor and trigger the control technology field.
Background technology
In thyristor conducting control method, the method for going to change the trigger angle of thyristor adopt for the direct voltage of a variation of thyristor gating circuit is often used.Thyristor gating circuit is isolated through high-frequency pulse transformer the triggering of thyristor, like this, make the electronic circuit and the residing high pressure strong power part of thyristor of the weak current part of control thyristor trigger angle realize electrical isolation, guaranteed the safety of control system.
When Single-chip Controlling thyristor trigger angle changes, also usually adopt the method for the PWM function direct voltage that filtering obtains changing through the RC change thyristor trigger angle of single-chip microcomputer.
Typical circuit is exactly the end that the pwm signal that sends of single-chip microcomputer at first enters resistance, and the other end of resistance connects an end of electric capacity, and the public ground of the other end connection circuit of electric capacity.Like this, obtain filtered direct voltage at resistance and electric capacity link.When the change in duty cycle of the pwm signal of single-chip microcomputer, just obtained the direct voltage of filtered variation.
For the triggering control of constant flow module thyristor and without pulse isolation transformer, but add the size of current that a variable DC voltage control constant flow module thyristor flows through, in this case, the main circuit of variable DC voltage and high pressure forceful electric power is contacted directly.Main circuit in the course of the work, existing strong electromagnetic interference also has the fluctuation of voltage.
But, single-chip microcomputer to keep working properly, to guarantee that not only single-chip microcomputer is not subjected to the damage of high pressure forceful electric power, and will guarantee the stability of single-chip microcomputer supply power voltage.Therefore, single-chip microcomputer sends the circuit that the PWM waveform obtains changing direct voltage needs redesign.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, propose a kind of isolation voltage regulating circuit based on single-chip microcomputer pulse width modulation, work does not exert an influence the high pressure forceful electric power in the time of making thyristor work to single-chip microcomputer, and the safety that guarantees system is with stable.
For realizing such purpose, in the technical scheme of the present invention, the PWM waveform that single-chip microcomputer is sent carries out filtering again through after the light-coupled isolation, thereby obtain the direct voltage of the variation isolated with Single Chip Microcomputer (SCM) system, with the direct voltage of this variation the constant current thyristor is controlled again, guaranteed the stability of single-chip microcomputer work thus.
Isolation voltage regulating circuit based on Single Chip Microcomputer (SCM) PWM of the present invention is included as the optocoupler of realizing isolating and adopting, the former limit of optocoupler power supply VCC is provided, the driving triode Q1 of former limit drive current is provided, isolate optocoupler O1, with the secondary power supply VB that former limit power supply VCC isolates, filter circuit RC.The PWM waveform that single-chip microcomputer sends makes the former limit of optocoupler have electric current to flow through, and at the secondary generation PWM of optocoupler waveform, wave circuit obtains the direct voltage that changes with the Single Chip Microcomputer (SCM) PWM waveform duty cycle after filtration.
The concrete structure of isolation voltage regulating circuit that the present invention is based on Single Chip Microcomputer (SCM) PWM is as follows:
The power supply of single-chip microcomputer is added to the anode of the light-emitting diode of isolating optocoupler through resistance, the light-emitting diodes tube cathode of optocoupler connects the collector electrode of base stage by the triode of Micro Controller Unit (MCU) driving, the collector electrode of optical coupling secondary edges connects constant flow module thyristor driver power supply through resistance, the emitter of optical coupling secondary edges at first passes through grounding through resistance, secondly receive on the electric capacity through resistance, and the other end ground connection of electric capacity.Export the direct voltage that the PWM waveform duty cycle changes in resistance, the output of electric capacity tie point with single-chip microcomputer.
Base stage when the Micro Controller Unit (MCU) driving triode, the collector electrode of triode makes isolates the former limit generation of optocoupler electric current, isolate the optical coupling secondary edges conducting thereby make, connect the resistance of isolating the optocoupler collector electrode with through the resistance of isolating the optocoupler grounded emitter to constant flow module thyristor power source voltage dividing potential drop, obtain according to the magnitude of voltage behind the electric resistance partial pressure at the emitter of isolating optocoupler; When single-chip microcomputer did not have drive signal, the emitter of isolating optocoupler did not have voltage output yet.Single-chip microcomputer sends pwm signal, and the emitter of isolating optocoupler just obtains the PWM voltage waveform, passes through the RC filter circuit again, obtains the direct voltage of corresponding PWM duty ratio, and this direct voltage control constant flow module thyristor is operated in the state of expection.
The present invention is simple in structure, has realized the function of single-chip microcomputer isolated controlling constant flow module thuristor working state, and work causes interference to single-chip microcomputer to have avoided high pressure forceful electric power and voltage fluctuation, has guaranteed the stability of whole system work.
Description of drawings
Fig. 1 is the isolation voltage regulating circuit schematic diagram that the present invention is based on Single Chip Microcomputer (SCM) PWM.
Among Fig. 1, O1 is for isolating optocoupler, and R1 is for isolating the current-limiting resistance on the former limit of optocoupler, and Q1 is that optocoupler drives triode, and R2 is a transistor base resistance, and R3, R4 are divider resistance, and resistance R 5, capacitor C 1 are formed filter circuit.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is further described.
The present invention design based on the isolation voltage regulating circuit schematic diagram of Single Chip Microcomputer (SCM) PWM as shown in Figure 1, the power supply VCC of single-chip microcomputer is added to the anode of the light-emitting diode of isolating optocoupler O1 through current-limiting resistance R1, the light-emitting diodes tube cathode of isolating optocoupler connects the collector electrode that optocoupler drives triode Q1, the PWM waveform output of single-chip microcomputer meets the base resistance R2 that optocoupler drives triode Q1, and optocoupler drives the dynamo-electric seedbed GND of emitter order sheet of triode Q1; The collector electrode of isolating optocoupler O1 secondary meets constant flow module thyristor driver power supply VB through resistance R 3, and the emitter of optical coupling secondary edges is received on the capacitor C 1 through resistance R 5 again simultaneously by resistance R 4 ground connection GND1, and the other end ground connection GND1 of capacitor C 1.Export the direct voltage that changes with the Single Chip Microcomputer (SCM) PWM waveform duty cycle at resistance R 5, capacitor C 1 tie point place.
When the Single Chip Microcomputer (SCM) PWM waveform drives the base stage injection current of triode Q1 by 2 pairs of optocouplers of resistance R, the collector electrode that optocoupler drives triode Q1 makes the former limit of isolation optocoupler O1 produce electric current, isolate the conducting of optocoupler O1 secondary thereby make, connect the resistance R 3 of isolation optocoupler collector electrode and 4 pairs of constant flow module thyristor power sources of resistance R voltage dividing potential drop of process isolation optocoupler grounded emitter, the magnitude of voltage after the emitter of isolating optocoupler 01 obtains according to resistance R 3, R4 dividing potential drop on the R4; And when single-chip microcomputer did not have the PWM drive signal, the voltage of isolating the emitter place of optocoupler O1 was zero.Like this, single-chip microcomputer sends pwm signal, the emitter of isolating optocoupler O1 just obtains the PWM voltage waveform, pass through the RC filter circuit of forming by resistance R 5, capacitor C 1 again, just obtain the direct voltage of corresponding PWM duty ratio, this direct voltage control constant flow module thyristor is operated in the state of expection, has realized the isolation voltage regulating circuit of single-chip microcomputer.
In one embodiment of the invention, employing circuit diagram as shown in Figure 1.
Wherein:
Isolating optocoupler O1 is TLP521-1, and Q1 is 9013/30V/500mA, R2=10k/0.25W, R1=820/0.25W, R3=2K/0.25W, R4=1k/0.25W, R5=100k/0.25W, C1=0.1uf, VB=12V, VCC=5V.
Claims (1)
1, a kind of isolation voltage regulating circuit based on single-chip microcomputer pulse width modulation, it is characterized in that the power supply (VCC) of single-chip microcomputer is added to the anode of the light-emitting diode of isolating optocoupler (O1) through current-limiting resistance (R1), the light-emitting diodes tube cathode of isolating optocoupler connects the collector electrode that optocoupler drives triode (Q1), the pulse width modulated waveform output of single-chip microcomputer connects the base resistance (R2) that optocoupler drives triode (Q1), and optocoupler drives the dynamo-electric seedbed (GND) of emitter order sheet of triode (Q1); The collector electrode of isolating optocoupler (O1) secondary connects constant flow module thyristor driver power supply (VB) through divider resistance (R3), the emitter of optical coupling secondary edges is through another divider resistance (R4) ground connection (GND1), resistance in filter circuit (R5) is received on the electric capacity (C1) again simultaneously, and the other end ground connection (GND1) of electric capacity (C1), the direct voltage that the resistance in filter circuit (R5), the output of electric capacity (C1) tie point place change with single-chip microcomputer pulse width modulated waveform change in duty cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510024282XA CN100345361C (en) | 2005-03-10 | 2005-03-10 | Isolation voltage regulation circuit regulated by pulse wide of single-chip machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510024282XA CN100345361C (en) | 2005-03-10 | 2005-03-10 | Isolation voltage regulation circuit regulated by pulse wide of single-chip machine |
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| CN1658483A CN1658483A (en) | 2005-08-24 |
| CN100345361C true CN100345361C (en) | 2007-10-24 |
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| CNB200510024282XA Expired - Fee Related CN100345361C (en) | 2005-03-10 | 2005-03-10 | Isolation voltage regulation circuit regulated by pulse wide of single-chip machine |
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| CN105171212A (en) * | 2015-08-27 | 2015-12-23 | 江苏扬子鑫福造船有限公司 | Non-contact switch for thermal cutting equipment |
| CN105337478A (en) * | 2015-11-16 | 2016-02-17 | 北京机械设备研究所 | Anti-parallel thyristor drive circuit for pulse width modulation voltage |
| CN105656468A (en) | 2016-01-18 | 2016-06-08 | 京东方科技集团股份有限公司 | Switch control device and method for electronic device, and electronic device |
| CN107660028B (en) * | 2017-11-03 | 2023-10-20 | 成都前锋电子仪器有限责任公司 | Single I/O double-lamp control circuit |
| CN112242128A (en) * | 2020-10-16 | 2021-01-19 | 临沂安迪电气有限公司 | Method for adjusting LCD contrast by key |
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2005
- 2005-03-10 CN CNB200510024282XA patent/CN100345361C/en not_active Expired - Fee Related
Patent Citations (7)
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| US4709320A (en) * | 1986-10-23 | 1987-11-24 | Zenith Electronics Corporation | Low voltage shutdown circuit |
| JPH01183925A (en) * | 1988-01-19 | 1989-07-21 | Mitsubishi Electric Corp | Analog signal insulating transmitting device |
| US5434694A (en) * | 1992-03-31 | 1995-07-18 | Yokogawa Electric Corporation | Signal isolating device |
| US5475579A (en) * | 1993-12-20 | 1995-12-12 | At&T Corp. | Pulse width modulator for switching power supply |
| CN1182306A (en) * | 1996-11-09 | 1998-05-20 | 三星电子株式会社 | Inverter driving circuit for brushless D. C. motor |
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| CN1658483A (en) | 2005-08-24 |
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Granted publication date: 20071024 Termination date: 20100310 |