CN203911741U - Protection circuit of module power supply - Google Patents
Protection circuit of module power supply Download PDFInfo
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- CN203911741U CN203911741U CN201420172803.0U CN201420172803U CN203911741U CN 203911741 U CN203911741 U CN 203911741U CN 201420172803 U CN201420172803 U CN 201420172803U CN 203911741 U CN203911741 U CN 203911741U
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- circuit
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- protection
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Abstract
A protection circuit of a module power supply. According to the protection circuit, a protection function cannot be affected by input voltage and a capacitive load, protection time delay of the circuit can be freely adjusted, and the capability of the capacitive load of the power supply can be adjusted, so that the capability of the capacitive load within a full input voltage range can be improved, and power consumption is small as a load is short-circuit for a long period. The protect circuit is simple in structure, low in cost, and convenient to debug. The short-circuit protection circuit cooperates with a current-type PWM control chip application circuit, so that long-time short-circuit protection of a load as the module power supply has different input voltages can be achieved, and the protection circuit is particularly suitable for a low-voltage isolation-type module power supply.
Description
Technical field
The utility model relates to modular power source technical field, is specifically related to a kind of protective circuit of modular power source.
Background technology
Short-circuit protection is the key factor of weighing modular power source reliability.Along with modular power source is in the extensive use of all trades and professions, user also requires higher to its reliability.This just requires modular power source under various abnormal conditions, can protect the safety of self and equipment.In the various protections of modular power source, short-circuit protection is particularly important.When modular power source short circuit, on each power device, can flow through very large electric current, the power device that is produces a large amount of heats and even damages power device, causes whole modular power source paralysis.So, design a kind of circuit that can protect self and device security under short-circuit conditions, be the key of head it off.
Present modular power source generally adopts PWM(pulse-width modulation) control technology, wherein UCC2800 is as popular current mode pwm chip, has that precision is high, an advantage such as working stability, peripheral circuit are simple, in modular power source, is widely used.The overcurrent of 2800 chips, short-circuit protection function are to utilize resistance or current transformer to detect transformer primary side electric current; the current sampling signal of obtaining is delivered to 2800 3 pin; in the time of power supply overcurrent or short circuit; transformer primary side electric current increases makes 3 pin current sampling signal voltages higher than 1.5V, and chip overcurrent protection action, reduces the duty ratio that 6 pin are exported; and then reduce the ON time of power MOS pipe; reduce output voltage, reduce power consumption, realize protection.Although this protected mode fast response time; can realize the protection in cycle one by one; but average power consumption is still very large in the time of long-time overcurrent or short circuit; particularly in the wider modular power source of input voltage range; the in the situation that of the higher long term overloading of input voltage or short circuit; still be easy to make the power device of module to damage, can not realize long load short circuits protection.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art; the purpose of this utility model is to provide a kind of protective circuit of modular power source; this short-circuit protection circuit coordinates current mode pwm chip application circuit; efficiently solve the problem of modular power source long-time short-circuit protection of load under different input voltages, be especially applicable to the modular power source of low pressure isolated form.
In order to achieve the above object, the technical scheme that the utility model is taked is:
A kind of protective circuit of modular power source, comprise amplifier U3,1 pin of amplifier U3 is connected with one end of resistance R 8, resistance R 9,2 pin of amplifier U3 are connected with one end of resistance R 10, capacitor C 8, capacitor C 9 and direct ground connection, 3 pin of amplifier U3 are connected with the other end of capacitor C 8, resistance R 10,4 pin of amplifier U3 are connected with the negative electrode of diode D4, diode D6, and 5,6 pin of amplifier U3 are connected with 8 pin of pwm chip U1; The anode of diode D4 is connected with 1 pin of amplifier U3, and the negative electrode of diode D5 is connected with one end of resistance R 10, and the anode of diode D6 is connected with 1 pin of pwm chip U1; Capacitor C 9 one end are connected with 5 pin of amplifier U3, the direct ground connection of the other end; The anode of one terminating diode D5 of resistance R 11, the anode of a terminating diode D6; The other end of resistance R 8 is connected with 8 pin of pwm chip U1; The direct ground connection of the other end of resistance R 9.
Described pwm chip U1 adopts control chip 2800 or 2803.
Described amplifier U3 adopts TLV341.
Described diode D4, diode D5, diode D6 are Schottky diode.
A kind of short-circuit protection circuit that the utility model provides is simple in structure; with low cost; be convenient to debugging; defencive function is not subject to input voltage and the impact with capacitive load; the value of resistance R 11 and capacitor C 8 can free setting, the protection time delay of regulating circuit, thus adjust power supply with capacitance load capability; not only improve the band capacitance load capability of full input voltage range, but also the little feature of power consumption while thering is long-time load short circuits.
Brief description of the drawings
Accompanying drawing is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
A kind of short-circuit protection circuit that the utility model provides is mainly for adopting current mode pwm chip 2800 series module Power Management Designs, the physical circuit of this short-circuit protection connects as shown in dotted line frame in accompanying drawing, a kind of protective circuit of modular power source, comprise amplifier U3, 1 pin of amplifier U3 and resistance R 8, one end of resistance R 9 connects, 2 pin of amplifier U3 and resistance R 10, capacitor C 8, one end of capacitor C 9 connects and direct ground connection, 3 pin of amplifier U3 and capacitor C 8, the other end of resistance R 10 connects, 4 pin of amplifier U3 and diode D4, the negative electrode of diode D6 connects, 5 of amplifier U3, 6 pin are connected with 8 pin of pwm chip U1, the anode of diode D4 is connected with 1 pin of amplifier U3, and the negative electrode of diode D5 is connected with one end of resistance R 10, and the anode of diode D6 is connected with 1 pin of pwm chip U1, capacitor C 9 one end are connected with 5 pin of amplifier U3, the direct ground connection of the other end, the anode of one terminating diode D5 of resistance R 11, the anode of a terminating diode D6, the other end of resistance R 8 is connected with 8 pin of pwm chip U1, the direct ground connection of the other end of resistance R 9.
Described pwm chip U1 adopts control chip 2800 or 2803.
Described amplifier U3 adopts TLV341.
Described diode D4, diode D5, diode D6 are Schottky diode.
Operation principle of the present utility model is:
In the time of load generation overcurrent or short circuit, feedback optical coupling isolator primary current reduces, secondary current also reduces thereupon, pwm chip 1 pin voltage is raise, in the time being elevated to a certain degree, amplifier U3 action, the 4 pin output electronegative potentials (being approximately 0.2V) of amplifier U3, diode D4, diode D6 conducting, the 1 pin current potential of amplifier U3 by diode D4 clamper in about 0.5V, the 1 pin current potential of pwm chip U1 by diode D6 clamper in about 0.5V, make 6 pin of pwm chip U1 reduce rapidly the output of duty ratio, thereby reduction output voltage, realize protection.Because there is the existence of capacitor C 8, make the 3 pin voltage ratio amplifier U3 of amplifier U3 1 pin voltage drop slowly, the electronegative potential that 4 pin of amplifier U3 just can continue for some time like this, makes the 1 pin current potential of pwm chip U1 be continued to drag down thereby diode D6 also continues conducting a period of time.When the energy storing in capacitor C 8 is discharged into a certain degree, the 3 pin current potentials of amplifier U3 are during lower than the 1 pin current potential of amplifier U3, the 4 pin output high potentials of amplifier U3 approach 5V, diode D4, diode D6 cut-off, the 1 pin current potential of pwm chip U1 rises, the 6 pin duty ratios of pwm chip U1 become large, module recovery output.If now overcurrent, short-circuit condition are not removed, the 1 pin voltage of pwm chip U1 raises again, diode D6 conducting again, the 1 pin current potential of pwm chip U1 is pulled low to again earth potential, reduce the output of duty ratio, reduce output voltage, again realize protection; After overcurrent, short-circuit state are removed, it is the former limit of optical coupling isolator and secondary current increase in feedback circuit that output voltage is set up, thereby the 1 pin current potential of pwm chip U1 is dragged down, amplifier U3 is failure to actuate, diode D6 cut-off, 6 pin of pwm chip U1 recover normal duty ratio output, thereby module recovery is normally worked.
The utility model is not only applicable to adopt 2800 modular power source, to adopting other similar current mode pwm chips as applicable equally in 2803 grades.
The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the utility model; the work that can expect without creative work or replacement, within all should being encompassed in protection range of the present utility model.
Claims (4)
1. the protective circuit of a modular power source, comprise amplifier U3, it is characterized in that: 1 pin of amplifier U3 is connected with one end of resistance R 8, resistance R 9,2 pin of amplifier U3 are connected with one end of resistance R 10, capacitor C 8, capacitor C 9 and direct ground connection, 3 pin of amplifier U3 are connected with the other end of capacitor C 8, resistance R 10,4 pin of amplifier U3 are connected with the negative electrode of diode D4, diode D6, and 5,6 pin of amplifier U3 are connected with 8 pin of pwm chip U1; The anode of diode D4 is connected with 1 pin of amplifier U3, and the negative electrode of diode D5 is connected with one end of resistance R 10, and the anode of diode D6 is connected with 1 pin of pwm chip U1; Capacitor C 9 one end are connected with 5 pin of amplifier U3, the direct ground connection of the other end; The anode of one terminating diode D5 of resistance R 11, the anode of a terminating diode D6; The other end of resistance R 8 is connected with 8 pin of pwm chip U1; The direct ground connection of the other end of resistance R 9.
2. the protective circuit of a kind of modular power source according to claim 1, is characterized in that: described pwm chip U1 adopts control chip 2800 or 2803.
3. the protective circuit of a kind of modular power source according to claim 1, is characterized in that: described amplifier U3 adopts TLV341.
4. the protective circuit of a kind of modular power source according to claim 1, is characterized in that: described diode D4, diode D5, diode D6 are Schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172803.0U CN203911741U (en) | 2014-04-10 | 2014-04-10 | Protection circuit of module power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172803.0U CN203911741U (en) | 2014-04-10 | 2014-04-10 | Protection circuit of module power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911741U true CN203911741U (en) | 2014-10-29 |
Family
ID=51785987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420172803.0U Expired - Fee Related CN203911741U (en) | 2014-04-10 | 2014-04-10 | Protection circuit of module power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203911741U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809069A (en) * | 2018-07-30 | 2018-11-13 | 广州金升阳科技有限公司 | A kind of monocycle peak current limit circuit |
-
2014
- 2014-04-10 CN CN201420172803.0U patent/CN203911741U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809069A (en) * | 2018-07-30 | 2018-11-13 | 广州金升阳科技有限公司 | A kind of monocycle peak current limit circuit |
| CN108809069B (en) * | 2018-07-30 | 2023-09-08 | 广州金升阳科技有限公司 | Single-period peak current limiting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20170410 |