CN208675104U - A kind of multiple-channel output is under-voltage and short-circuit protection circuit - Google Patents
A kind of multiple-channel output is under-voltage and short-circuit protection circuit Download PDFInfo
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- CN208675104U CN208675104U CN201821327514.8U CN201821327514U CN208675104U CN 208675104 U CN208675104 U CN 208675104U CN 201821327514 U CN201821327514 U CN 201821327514U CN 208675104 U CN208675104 U CN 208675104U
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Abstract
The utility model provides that a kind of multiple-channel output is under-voltage and short-circuit protection circuit; applied in the Switching Power Supply with multiple-channel output; with in Switching Power Supply wherein the current rectifying and wave filtering circuit of output module is connect all the way; including threshold circuit, sample circuit, comparison circuit, control circuit and switching circuit; the input terminal of threshold circuit connects the Same Name of Ends of transformer secondary winding in the road output module, the first input end of the output end connection comparison circuit of threshold circuit；The input terminal of sample circuit is connecting the output of the road output module just, the second input terminal of the output end connection comparison circuit of sample circuit；The input terminal of the output end connection control circuit of comparison circuit, the input terminal of the output end connection switch circuit of control circuit, control switch circuit turns on and off, and the output that the output end of switching circuit connects the road output module is negative, controls turning on and off for the road output module.The utility model circuit is simple, at low cost, and mutually indepedent between each road output, output voltage is through excessively high.
Description
Technical field
The utility model relates to the under-voltage of field of power supplies, especially multiple-output electric power and protection circuit.
Background technique
Nowadays power supply has been applied in various environment, and reliability requirement is also higher and higher, and power supply is integrated with various
Defencive function guarantees its reliability, and short-circuit protection and overcurrent protection are exactly one of important defencive function, at present power supply
Internal integrated circuit has all integrated short-circuit protection and overcurrent protection, and the over-current protection point of most of power supply design is all bigger,
Before power supply enters overcurrent protection, output voltage can be reduced, and power supply and not enter protected mode at this time, with super rated power
Work, there are the hidden danger of explosion, while output voltage low precision is easily damaged and sets if power supply is applied in high-accuracy equipment
It is standby；The voltage and current that power supply is exported by detection, once integrated circuit judges whether short circuit perhaps overcurrent short circuit or overcurrent,
Integrated circuit enters short circuit protection mode, and shutdown output avoids power supply from being unlikely to overheat and explode, and then protection power source is damaged
It is bad, as long as so the output of power supply single channel perhaps multiple-channel output wherein exports under-voltage and short-circuit or overcurrent all the way, power supply all can be into
Enter protected mode, if multiple-output electric power, once wherein short circuit or overcurrent, power supply enter protected mode all the way, other are defeated
It can also close out, influence to export, other equipment are damaged, there are great security risks, reduce the reliability of power supply.
Utility model content
In view of this, the present invention provides a kind of multiple-channel output is under-voltage and short-circuit protection circuit, it is applied to that there is multichannel
In the Switching Power Supply of output, in Switching Power Supply wherein the current rectifying and wave filtering circuit of output module is connect all the way, it is defeated to control the road
Module turns on and off out, effectively solves the above problems.
The purpose of this utility model is achieved through the following technical solutions:
A kind of multiple-channel output is under-voltage and short-circuit protection circuit, applied in the Switching Power Supply with multiple-channel output, with switch
The wherein current rectifying and wave filtering circuit connection of output module all the way in power supply, the multiple-channel output is under-voltage and short-circuit protection circuit packet
Threshold circuit, sample circuit, comparison circuit, control circuit and switching circuit are included, the input terminal of threshold circuit connects road output
The Same Name of Ends of transformer secondary winding in module, the first input end of the output end connection comparison circuit of threshold circuit；Sampling electricity
The input terminal on road is connecting the output of the road output module just, the second input terminal of the output end connection comparison circuit of sample circuit；
The input terminal of the output end connection control circuit of comparison circuit, the input terminal of the output end connection switch circuit of control circuit, control
Switching circuit processed turns on and off, and the output that the output end of switching circuit connects the road output module is negative, controls road output
Module turns on and off.
Preferably, the threshold circuit includes resistance R3, resistance R4, capacitor C3, one end conduct of the resistance R3
The input terminal of threshold circuit, one end of the other end connection resistance R4 of resistance R3, the other end ground connection of resistance R4, capacitor C3 are in parallel
At the both ends of resistance R4；Output end of the tie point of resistance R3 and resistance R4 as threshold circuit.
Preferably, described includes resistance R5, resistance R6, capacitor C4, one end conduct of the resistance R5 using circuit
The input terminal of sample circuit, one end of the other end connection resistance R6 of resistance R5, the other end ground connection of resistance R6, capacitor C4 are in parallel
At the both ends of resistance R6；Output end of the tie point of resistance R5 and resistance R6 as sample circuit.
Preferably, the comparison circuit includes comparator, the normal phase input end of comparator as comparison circuit first
Input terminal, second input terminal of the inverting input terminal of comparator as comparison circuit, the output end of comparator is as comparison circuit
Output end.
Preferably, the control circuit includes resistance R7 and triode Q2, and the base stage of triode Q2 is as control circuit
Input terminal, the emitter ground connection of triode Q2, one end of the collector connection resistance R7 of triode Q2, and as control circuit
Output end, resistance R7 the other end connection threshold circuit input terminal.
Preferably, the switching circuit includes relay K1, resistance R8, resistance R9, triode Q1, one end of resistance R9
Emitter as the input terminal of switching circuit, the base stage of the other end connecting triode Q1 of resistance R9, triode Q1 is grounded, and three
One end of the collector connection resistance R8 of pole pipe Q1, the input terminal of the other end connection threshold circuit of resistance R8；The two of resistance R8
End is connected between two normally closed ports of relay K1；Two normally opened ports of relay K1 are connected to road bypass output mould
The output of block is negative, and control the road bypass output module exports negative turn on and off.
The working principle of the utility model is as follows:
It includes diode D2 and defeated that the current rectifying and wave filtering circuit of input undervoltage and short-circuit protection circuit is connected in the utility model
The Same Name of Ends of transformer secondary winding in the anode connection switch power supply of filter capacitor C2 out, D2, the one of the cathode connection C2 of D2
End, and the output as the road output module is just；The different name end of the other end connection transformer secondary winding of C2, and as the road
The output of output module is negative.
Threshold circuit adopts rectifier diode D2 cathode voltage, and it is defeated to form threshold voltage (R4 both end voltage) by electric resistance partial pressure
The normal phase input end of comparator U1A is arrived out, and sample circuit adopts rectifier diode D2 cathode voltage (i.e. output voltage Vo1+), passes through
Electric resistance partial pressure forms sampled voltage (R6 both end voltage) and is output to the inverting input terminal of comparator U1A, when power initiation output,
When comparator U1A inverting input terminal voltage (R6 both end voltage) is greater than normal phase input end voltage (R4 both end voltage), comparator
U1A output cut-off, triode Q2 cut-off, the base stage of Q1 are high level, and Q1 is connected, and relay K1 conducting, switch is attracted, and power supply is just
Often output；
When bypass output is under-voltage, comparator U1A inverting input terminal voltage (R6 both end voltage) is less than normal phase input end electricity
When pressing (R4 both end voltage), comparator U1A exports high level, triode Q2 conducting, by the base stage of Q1 down for low level, Q1
Cut-off, relay K1 cut-off, switch disconnect, bypass short circuit output, and main road continues normal output, ensure that main road continues normally
Output；
When bypass output is under-voltage and short-circuit, it is defeated that comparator U1A inverting input terminal voltage (R6 both end voltage) is less than positive
When entering to hold voltage (R4 both end voltage), comparator U1A exports high level, triode Q2 conducting, by the base stage of Q1 down for low electricity
It is flat, Q1 cut-off, relay K1 cut-off, switch disconnection, bypass short circuit output, and main road continues normal output, ensure that main road is held
Continuous normal output；
Compared with prior art, the utility model has the following beneficial effects:
1) the utility model is simple, and number of devices is few, easily designed, and convenient for debugging, PCB miniaturization is at low cost, more real
With；
2) the utility model high reliablity；
3) output cross regulation rate of the utility model is good, does not influence each output voltage precision；
4) the utility model is low in energy consumption, hardly the increase loss of power.
Detailed description of the invention
Fig. 1 is that a kind of multiple-channel output of the utility model is under-voltage and the functional block diagram of short-circuit protection circuit；
Fig. 2 is that a kind of multiple-channel output of the utility model is under-voltage and the functional block diagram of the application of short-circuit protection circuit；
Fig. 3 is that a kind of multiple-channel output of the utility model is under-voltage and the schematic diagram of short-circuit protection circuit.
Specific embodiment
First embodiment
The utility model is described in detail so that two-way exports as an example.As depicted in figs. 1 and 2, more for the utility model
Road exports under-voltage and short-circuit protection circuit functional block diagram and application block diagram.Multiple-channel output is under-voltage and short-circuit protection circuit and switch
The wherein current rectifying and wave filtering circuit connection of output module all the way in power supply, individually controls turning on and off for the road output module.
The current rectifying and wave filtering circuit that input undervoltage and short-circuit protection circuit are connected in the utility model includes diode D2 and output filtered electrical
Hold C2, the Same Name of Ends of transformer secondary winding in the anode connection switch power supply of D2, one end of the cathode connection C2 of D2, and conduct
The output of the road output module is just；The different name end of the other end connection transformer secondary winding of C2, and as the road output module
Output it is negative.
A kind of multiple-channel output is under-voltage and short-circuit protection circuit includes threshold circuit, sample circuit, comparison circuit, control circuit
And switching circuit, the input terminal of threshold circuit connect the Same Name of Ends of transformer secondary winding in the road output module, threshold circuit
Output end connection comparison circuit first input end；The input terminal of sample circuit is connecting the output of the road output module just, adopts
Second input terminal of the output end connection comparison circuit of sample circuit；The input terminal of the output end connection control circuit of comparison circuit,
The input terminal of the output end connection switch circuit of control circuit, control switch circuit turn on and off, the output of switching circuit
The output that end connects the road output module is negative, controls turning on and off for the road output module.
As shown in figure 3, being the circuit diagram of the utility model, threshold circuit includes resistance R3, resistance R4, capacitor C3,
Input terminal of the one end of the resistance R3 as threshold circuit, one end of the other end connection resistance R4 of resistance R3, resistance R4
Other end ground connection, capacitor C3 is connected in parallel on the both ends of resistance R4；The tie point of resistance R3 and resistance R4 is as the defeated of threshold circuit
Outlet.
It include resistance R5, resistance R6, capacitor C4, input of the one end of the resistance R5 as sample circuit using circuit
End, one end of the other end connection resistance R6 of resistance R5, the other end ground connection of resistance R6, capacitor C4 are connected in parallel on the two of resistance R6
End；Output end of the tie point of resistance R5 and resistance R6 as sample circuit.
Comparison circuit includes comparator, first input end of the normal phase input end of comparator as comparison circuit, comparator
Second input terminal of the inverting input terminal as comparison circuit, output end of the output end of comparator as comparison circuit.
The switching circuit includes relay K1, resistance R8, resistance R9, triode Q1, and one end of resistance R9, which is used as, opens
The input terminal on powered-down road, the base stage of the other end connecting triode Q1 of resistance R9, the emitter ground connection of triode Q1, triode
One end of the collector connection resistance R8 of Q1, the input terminal of the other end connection threshold circuit of resistance R8；The both ends of resistance R8 connect
It connects between two normally closed ports of relay K1；Two normally opened ports of relay K1 are connected to the road bypass output module
Output is negative, and control the road bypass output module exports negative turn on and off.
It is as follows using utility model works principle:
Illustrate the working principle of the circuit by taking two-way as an example:
Threshold circuit adopts rectifier diode D2 cathode voltage, and it is defeated to form threshold voltage (R4 both end voltage) by electric resistance partial pressure
The normal phase input end of comparator U1A is arrived out, and sample circuit adopts rectifier diode D2 cathode voltage (i.e. output voltage Vo1+), passes through
Electric resistance partial pressure forms sampled voltage (R6 both end voltage) and is output to the inverting input terminal of comparator U1A；When power initiation output,
When comparator U1A inverting input terminal voltage (R4 both end voltage) is greater than normal phase input end voltage (R6 both end voltage), comparator
U1A output cut-off, triode Q2 cut-off, the input terminal of Q1 are high level, and Q1 is connected, and relay K1 conducting, switch is attracted, power supply
Normal output；
When bypass output is under-voltage, comparator U1A inverting input terminal voltage (R4 both end voltage) is less than normal phase input end electricity
When pressing (R6 both end voltage), comparator U1A exports high level, triode Q2 conducting, by the input terminal of Q1 down for low level,
Q1 cut-off, relay K1 cut-off, switch disconnect, bypass short circuit output, and main road continues normal output, ensure that main road continues
Normal output；
When bypass output short-circuit, comparator U1A inverting input terminal voltage (R4 both end voltage) is less than normal phase input end electricity
When pressing (R6 both end voltage), comparator U1A exports high level, triode Q2 conducting, by the input terminal of Q1 down for low level,
Q1 cut-off, relay K1 cut-off, switch disconnect, bypass short circuit output, and main road continues normal output, ensure that main road continues
Normal output；
The utility model can also be used in three tunnels and export the above power supply, and realization principle is also identical with above embodiments.
The embodiments of the present invention is without being limited thereto, according to the above content of the utility model, utilizes the general of this field
Logical technological know-how and customary means have in the utility model under the premise of not departing from the utility model above-mentioned basic fundamental thought
Body implementing circuit can also make the modification, replacement or change of other diversified forms, all fall within the utility model rights protection model
Within enclosing.
Claims (6)
1. a kind of multiple-channel output is under-voltage and short-circuit protection circuit, applied in the Switching Power Supply with multiple-channel output, with switch electricity
The wherein current rectifying and wave filtering circuit connection of output module all the way in source, it is characterised in that: the multiple-channel output is under-voltage and short-circuit
Protection circuit includes threshold circuit, sample circuit, comparison circuit, control circuit and switching circuit, and the input terminal of threshold circuit connects
The Same Name of Ends of transformer secondary winding in the output module of the road Jie Gai, the first input of the output end connection comparison circuit of threshold circuit
End；The input terminal of sample circuit is connecting the output of the road output module just, and the of the output end of sample circuit connection comparison circuit
Two input terminals；The input terminal of the output end connection control circuit of comparison circuit, the output end connection switch circuit of control circuit
Input terminal, control switch circuit turn on and off, and the output that the output end of switching circuit connects the road output module is negative, control
The road output module turns on and off.
2. a kind of multiple-channel output according to claim 1 is under-voltage and short-circuit protection circuit, it is characterised in that: the threshold value
Circuit includes resistance R3, resistance R4, capacitor C3, input terminal of the one end of the resistance R3 as threshold circuit, resistance R3's
The other end connects one end of resistance R4, the other end ground connection of resistance R4, and capacitor C3 is connected in parallel on the both ends of resistance R4；Resistance R3 and electricity
Hinder output end of the tie point of R4 as threshold circuit.
3. a kind of multiple-channel output according to claim 1 is under-voltage and short-circuit protection circuit, it is characterised in that: the use
Circuit includes resistance R5, resistance R6, capacitor C4, input terminal of the one end of the resistance R5 as sample circuit, resistance R5's
The other end connects one end of resistance R6, the other end ground connection of resistance R6, and capacitor C4 is connected in parallel on the both ends of resistance R6；Resistance R5 and electricity
Hinder output end of the tie point of R6 as sample circuit.
4. a kind of multiple-channel output according to claim 1 is under-voltage and short-circuit protection circuit, it is characterised in that: the comparison
Circuit includes comparator, first input end of the normal phase input end of comparator as comparison circuit, the inverting input terminal of comparator
As the second input terminal of comparison circuit, output end of the output end of comparator as comparison circuit.
5. a kind of multiple-channel output according to claim 1 is under-voltage and short-circuit protection circuit, it is characterised in that: the control
Circuit includes resistance R7 and triode Q2, input terminal of the base stage of triode Q2 as control circuit, the emitter of triode Q2
Ground connection, one end of the collector connection resistance R7 of triode Q2, and the output end as control circuit, the other end of resistance R7 connect
Connect the input terminal of threshold circuit.
6. a kind of multiple-channel output according to claim 5 is under-voltage and short-circuit protection circuit, it is characterised in that: the switch
Circuit includes relay K1, resistance R8, resistance R9, triode Q1, input terminal of the one end of resistance R9 as switching circuit, resistance
The base stage of the other end connecting triode Q1 of R9, the emitter ground connection of triode Q1, the collector of triode Q1 connect resistance R8
One end, resistance R8 the other end connection threshold circuit input terminal；The both ends of resistance R8 are connected to two of relay K1 often
Between closed end mouth；The output that two normally opened ports of relay K1 are connected to the road bypass output module is negative, controls the road bypass
The output of output module is negative to be turned on and off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821327514.8U CN208675104U (en) | 2018-08-17 | 2018-08-17 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821327514.8U CN208675104U (en) | 2018-08-17 | 2018-08-17 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
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| CN208675104U true CN208675104U (en) | 2019-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696111A (en) * | 2018-08-17 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
-
2018
- 2018-08-17 CN CN201821327514.8U patent/CN208675104U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696111A (en) * | 2018-08-17 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
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