CN107896053A - A kind of switch power module delay control method based on optocoupler - Google Patents
A kind of switch power module delay control method based on optocoupler Download PDFInfo
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- CN107896053A CN107896053A CN201711155213.1A CN201711155213A CN107896053A CN 107896053 A CN107896053 A CN 107896053A CN 201711155213 A CN201711155213 A CN 201711155213A CN 107896053 A CN107896053 A CN 107896053A
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- Prior art keywords
- optocoupler
- pin
- power module
- input
- capacitance
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Abstract
The present invention provides a kind of switch power module delay control method based on optocoupler, is combined using optocoupler and RC circuits, provides OC outputs by two-way optocoupler, power-on time is controlled by RC circuits；RC circuits are made up of the pull-up resistor inside a variable capacitance and switch power module, and variable capacitance one terminates circuit common, the input pin of a termination switch power module；By change can the capacitance of power transformation realize delays time to control, the more big upper electricity of capacitor's capacity is slower, and the switch order determined according to systemic-function selects suitable capacitance, realizes that the delayed of Switching Power Supply controls.
Description
Technical field
The invention belongs to Switching Power Supply electric sequence control technology, is related to a kind of switch power module delay control method,
By the Enable Pin level of controlling switch power supply, determine whether Switching Power Supply exports, by controlling Enable Pin power-on time to control
Each intermodule electric sequence.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio that controlling switch pipe turns on and off, and remains steady
Determine a kind of power supply of output voltage.Whether Switching Power Supply exports is controlled by its Enable Pin level height, Switching Power Supply Enable Pin
Inside is connected to VIN by 10K pull-up resistor, and the Enable Pin high level is effective, and Enable Pin requires external OC doors output control.
When outside is hanging or adds OC doors (being off state), the Enable Pin is high level, and module normally exports.In control system
In, different electrical power module requires to electric sequence, in order to meet disparate modules power-on time requirement, controls such power module
The chip with delays time to control need to be used.Such switch power module delays time to control typically uses chip inlet ADM1085 at present,
Cost is higher.
The content of the invention
It is an object of the invention to propose a kind of switch power module delay control method, realized using ball bearing made
ADM1085 delayed enables control function, import device ADM1085 can be substituted, to reduce cost.
Technical scheme is as follows：
A kind of switch power module delay control method based on optocoupler, it is characterised in that：Using optocoupler and RC circuit knots
Close, provide OC outputs by optocoupler, power-on time is controlled by RC circuits, realize the delayed control of Switching Power Supply；
The optocoupler includes two-way, and upper electric control positive pole is connected to the pin of input 1 of first via optocoupler by resistance R1, the
The upper electric control negative pole of the pin of input 2 connection of optocoupler all the way, it is defeated that the pin of output 8 of first via optocoupler by resistance R2 is connected to system power supply
Enter end, and the pin of input 3 of the second road optocoupler is connected to by resistance R3；The upper electric control of the pin of input 4 connection of second road optocoupler
Negative pole, the pin of output 6 and 5 pin of the second road optocoupler export as OC, respectively with the input pin and Switching Power Supply of switch power module
Negative pole connects；
RC circuits are made up of the pull-up resistor R0 inside a variable capacitance and switch power module, the termination of variable capacitance one system
System power cathode, the input pin of a termination switch power module；Pull-up resistor R0 resistances are constant, and delays time to control can by changing
The capacitance of power transformation realizes that the more big upper electricity of capacitance is slower, and the switch order determined according to circuit function is from suitable
Capacitance.
Switching Power Supply delayed control of the present invention based on optocoupler, power-on time can be calculated by RC charge formulas,
Control the electrifying timing sequence between power module.According to different capacitor's capacities is chosen, reach power-on time difference, meet disparate modules
Between electric sequence control.This method circuit is simple, enables and delay feature is complete.By repeatedly upper electric control, its conduct is verified
Control circuit is safe and reliable, is contrasted from function and performance, can substitute import device ADM1085.
The circuit of the present invention is easily understood, multiple functional, and it is small to take board area.This method is also applied for needing essence
The really Switching Power Supply application circuit of control power-on time.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the present invention.
Embodiment
By studying ADM1085 chip functions, it is known that it is mainly by two functions.On the one hand OC outputs, the opposing party are provided
There is delays time to control inside face, different switch power module electric sequences can be controlled.In order to realize the two functions, the present invention adopts
Combined with optocoupler and RC circuits, realize the delayed control of switch power module, circuit diagram is as shown in figure 1, its principle is as follows：
1st, optocoupler provides OC outputs：
From the operation principle of optocoupler, the break-make of optocoupler can be used as switch to use, and this is also the common usage of optocoupler.
Because the Enable Pin of Switching Power Supply is high level control, so in order to ensure input high level, output is still high level, it is necessary to logical
To cross two-way optocoupler could realize Gao-high control, the present invention upper electric control ability of optocoupler by experimental verification.
2nd, RC circuits control power-on time：
Shown in RC Charging equations such as following formula (1)：
Wherein, VcTo appoint a flashy electric capacity both end voltage, i.e. INHT3 voltages in Fig. 1；
VSFor the source voltage of charging, i.e. Fig. 1 28V；
RC is capacitor charging/discharging time constant, and C is Fig. 1 C3, and R is the pull-up resistor R0 inside Switching Power Supply.
T is time span in seconds；
From formula (1), the charging interval of RC circuits is determined by capacitor's capacity and resistance value, because R is made by Switching Power Supply
Energy end pull-up resistor R0 determines that resistance is constant, then power-on time is determined by capacitor's capacity.It is required that upper electric fast circuit can be adopted
It is on the contrary opposite with small capacitances.Work as VcWhen reaching the high voltage of Switching Power Supply Enable Pin, Switching Power Supply output, so VcBy switch electricity
Source enables terminal voltage and determined.
As shown in figure 1, N1 is two-way optocoupler, upper electric control signal positive pole TTL+ is connected to first via optocoupler by resistance R1
The pin of input 1, the pin of another input 2 of first via optocoupler connects electric control signal positive pole TTL-, and the pin of output 8 of first via optocoupler leads to
Cross pull-up resistor R2 and be connected to system power supply input 28V, and the pin of input 3 of the second road optocoupler is connected to by resistance R3；The
The upper electric control negative pole of the pin of input 4 connection of two road optocouplers, the pin of output 6 and 5 pin of the second road optocoupler export as OC, respectively with opening
The input pin INH of powered-down source module connects with Switching Power Supply negative pole IN COM pin.
RC circuits are made up of the pull-up resistor R0 inside a variable capacitance C3 and switch power module, variable capacitance C3 one end
Welding system power cathode, the input pin INH pin of a termination switch power module.
In circuit shown in Fig. 1, when upper electric control signal TTL+ is powered up, the two-way output state of optocoupler is respectively first
Road turns on, the cut-off of the second tunnel so that output is hanging, internal for pull-up, institute because INHT3 is connected in the Enable Pin of Switching Power Supply
Using INHT3 as high level, Switching Power Supply is set normally to export.On the contrary, when control signal is 0V, first via cut-off, the second tunnel is led
It is logical so as to export as low level, directly drag down Switching Power Supply Enable Pin, Switching Power Supply is closed.
Delays time to control realizes that the more big upper electricity of capacitance is slower by changing C3 capacitance, it is possible to determines to open according to system
The switching sequence of powered-down source module selects suitable capacitance.
Claims (1)
- A kind of 1. switch power module delay control method based on optocoupler, it is characterised in that：Combined using optocoupler and RC circuits, OC outputs are provided by optocoupler, power-on time is controlled by RC circuits, realize the delayed control of Switching Power Supply；The optocoupler includes two-way, and upper electric control positive pole is connected to the pin of input 1 of first via optocoupler, the first via by resistance R1 The upper electric control negative pole of the pin of input 2 connection of optocoupler, the pin of output 8 of first via optocoupler are connected to system power supply by resistance R2 and inputted Hold, and the pin of input 3 of the second road optocoupler is connected to by resistance R3；The upper electric control of the pin of input 4 connection of second road optocoupler is born Pole, the pin of output 6 and 5 pin of the second road optocoupler are exported as OC, and the input pin and Switching Power Supply with switch power module are born respectively Pole connects；RC circuits are made up of the pull-up resistor R0 inside a variable capacitance and switch power module, the terminating systems of variable capacitance one electricity Source negative pole, the input pin of a termination switch power module；Pull-up resistor R0 resistances are constant, and delays time to control can power transformation by changing Capacitance realize, the more big upper electricity of capacitance is slower, according to circuit function determine switch order selection suitable capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711155213.1A CN107896053A (en) | 2017-11-17 | 2017-11-17 | A kind of switch power module delay control method based on optocoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711155213.1A CN107896053A (en) | 2017-11-17 | 2017-11-17 | A kind of switch power module delay control method based on optocoupler |
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| CN107896053A true CN107896053A (en) | 2018-04-10 |
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| CN201711155213.1A Pending CN107896053A (en) | 2017-11-17 | 2017-11-17 | A kind of switch power module delay control method based on optocoupler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494236A (en) * | 2018-04-13 | 2018-09-04 | 广州金升阳科技有限公司 | A kind of multiple-channel output sequential start-up circuit |
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| CN101509960A (en) * | 2008-11-20 | 2009-08-19 | 奇瑞汽车股份有限公司 | Battery voltage and temperature monitoring device |
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN102522887A (en) * | 2011-12-15 | 2012-06-27 | 苏州合欣美电子科技有限公司 | Bidirectional communication circuit of dry cleaning machine |
| CN104714579A (en) * | 2015-03-09 | 2015-06-17 | 中国科学院长春光学精密机械与物理研究所 | Spaceborne camera power supply system based on RLC oscillating discharge |
| CN104714581A (en) * | 2015-03-09 | 2015-06-17 | 中国科学院长春光学精密机械与物理研究所 | spaceborne camera power supply system based on transformer |
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2017
- 2017-11-17 CN CN201711155213.1A patent/CN107896053A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509960A (en) * | 2008-11-20 | 2009-08-19 | 奇瑞汽车股份有限公司 | Battery voltage and temperature monitoring device |
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN102522887A (en) * | 2011-12-15 | 2012-06-27 | 苏州合欣美电子科技有限公司 | Bidirectional communication circuit of dry cleaning machine |
| CN104714579A (en) * | 2015-03-09 | 2015-06-17 | 中国科学院长春光学精密机械与物理研究所 | Spaceborne camera power supply system based on RLC oscillating discharge |
| CN104714581A (en) * | 2015-03-09 | 2015-06-17 | 中国科学院长春光学精密机械与物理研究所 | spaceborne camera power supply system based on transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494236A (en) * | 2018-04-13 | 2018-09-04 | 广州金升阳科技有限公司 | A kind of multiple-channel output sequential start-up circuit |
| CN108494236B (en) * | 2018-04-13 | 2024-02-13 | 广州金升阳科技有限公司 | Multi-output time sequence starting circuit |
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Application publication date: 20180410 |