CN207896864U - A kind of control circuit and power supply reducing constant-current supply short-circuit power - Google Patents
A kind of control circuit and power supply reducing constant-current supply short-circuit power Download PDFInfo
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- CN207896864U CN207896864U CN201820039326.9U CN201820039326U CN207896864U CN 207896864 U CN207896864 U CN 207896864U CN 201820039326 U CN201820039326 U CN 201820039326U CN 207896864 U CN207896864 U CN 207896864U
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Abstract
The utility model is related to a kind of control circuit and power supply reducing constant-current supply short-circuit power, which includes：Master control IC for adjusting output power of power supply；The drop power circuit being connect respectively with the feeder ear of the frequency adjustable side of master control IC and master control IC；It is connect with drop power circuit, the power supply circuit for providing operating voltage to drop power circuit；Drop power circuit is turned off when power supply works normally, and the impedance of the frequency adjustable side of master control IC is connected and reduces in the output terminal shortcircuit of power supply, to reduce the output power of power supply.The utility model is in the output terminal shortcircuit for detecting power supply, the impedance for reducing the frequency adjustable side of master control IC by dropping power circuit, and then improve the working frequency of master control IC, so that the output load capacity of complete machine reduces, reduce the output power of power supply, so that secondary diode is operated in the state of a safety and stability, improves power supply global reliability, stability and safety, extend the service life of power supply.
Description
Technical field
The utility model is related to the technical fields of power supply, more specifically to a kind of reduction constant-current supply short-circuit power
Control circuit and power supply.
Background technology
With the popularization of LED light, the universal and people of LED illumination pursue the higher of future life quality, high-performance
The LED power of high reliability more and more obtains the attention of society, to push the continuous innovation and development of technology, occurs
Many better Power Management Design technologies of update, and continuous mature.
For traditional constant-current supply in power output end short circuit, the current loop of power source internal can allow current control being arranged
1-1.5 times of follow current.The diode of output end is in a kind of hard service, if switched at this time in input
Impact, the voltage and current stress risk of diode will be multiplied.
It can be seen that when short trouble occurs for output end, it is lasting defeated usually to will appear electric current for conventional constant current power circuit
Go out, prodigious Wen Sheng and voltage, current stress pressure are caused to secondary diode, switch input is electric repeatedly before failure does not exclude
Source easilys lead to machine failure.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, it is permanent to provide a kind of reduction
The control circuit and power supply of galvanic electricity source short-circuit power.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of reduction constant-current supply short circuit work(
The control circuit of rate, including：
Master control IC for adjusting output power of power supply；
The drop power circuit being connect respectively with the feeder ear of the frequency adjustable side of the master control IC and the master control IC；
It is connect with the drop power circuit, the power supply circuit for providing operating voltage to the drop power circuit；
The drop power circuit is turned off when power supply works normally, and is connected and is reduced in the output terminal shortcircuit of the power supply
The impedance of the frequency adjustable side of the master control IC, to reduce the output power of power supply.
Preferably, the power supply circuit includes auxiliary winding, rectifier diode, current-limiting resistance and the energy storage electricity of transformer
Hold；
The auxiliary winding of the transformer includes first end and second end, the first end of the auxiliary winding of the transformer with
The anode of the rectifier diode connects, the second end ground connection of the auxiliary winding of the transformer, the moon of the rectifier diode
Pole is connect by the current-limiting resistance with the drop power circuit, the first end of the storage capacitor and the rectifier diode
Cathode connects, and the second end of the storage capacitor is connect with the second end of the auxiliary winding of the transformer, and energy storage electricity
The second end of appearance and the connecting node of the second end of the auxiliary winding of the transformer are grounded.
Preferably, the drop power circuit includes turning circuit, bleeder circuit, first switch and resistance R2；
The input terminal of the turning circuit is connect with the current-limiting resistance, the first output end of the turning circuit with it is described
The first end of bleeder circuit connects, and the second output terminal of the turning circuit is connect with the feeder ear of the master control IC；
The second end of the bleeder circuit is grounded, and the third end of the bleeder circuit connects with the first end of the first switch
It connects, the second end of the first switch is connect with the frequency adjustable side of the master control IC, and the third end of the first switch passes through
The resistance R2 ground connection；
The turning circuit receives the operating voltage and generates first voltage and second voltage based on the operating voltage；
The master control IC receives the second voltage and is worked according to the second voltage；The bleeder circuit receives the first voltage
And the on or off that voltage division signal controls the first switch to the first switch is generated based on the first voltage.
Preferably, the turning circuit includes diode D1 and diode D2；
The anode of the diode D1 is connect with the current-limiting resistance, cathode and the bleeder circuit of the diode D1
Connection, the anode of the diode D2 are connect with the anode of the diode D1, cathode and the master control of the diode D2
The feeder ear of IC connects；
The anode of the anode of the diode D1 and the diode D2 are the input terminal of the turning circuit, two pole
The cathode of pipe D1 is the first output end of the turning circuit, and the cathode of the diode D2 is the second defeated of the turning circuit
Outlet.
Preferably, the bleeder circuit includes divider resistance R1 and divider resistance R3；
The first end of the divider resistance R1 is connect with the cathode of the diode D1, the second end of the divider resistance R1
Connect with the first end of the divider resistance R3, the second end of divider resistance R3 ground connection, the divider resistance R1 with it is described
Connecting node between divider resistance R3 is also connect with the first end of the first switch；
The first end of the divider resistance R1 is the first end of the bleeder circuit, and the second end of the divider resistance R3 is
The second end of the bleeder circuit, the connecting node between the divider resistance R1 and the divider resistance R3 are partial pressure electricity
The third end on road.
Preferably, the first switch includes triode Q1, the base stage of the triode Q1 and the divider resistance R1 with
Connecting node connection between the divider resistance R3, the frequency adjustable side of the emitter of the triode Q1 and the master control IC
Connection, the collector of the triode Q1 are grounded by the resistance R2；
The base stage of the triode Q1 is the first end of the first switch, the transmitting of the triode Q1 extremely described the
The second end of one switch, the third end of the extremely described first switch of current collection of the triode Q1.
Preferably, further include parallel resistance R104, the frequency of the first end of the parallel resistance R104 and the master control IC
Adjustable side connects, the second end ground connection of the parallel resistance R104.
Preferably, further include the feedback being connect respectively with the output end of the frequency adjustable side of the master control IC and the power supply
Adjust circuit.
Preferably, the feedback regulating circuit includes feedback circuit and current loop；
The current loop difference feedback circuit is connect with the output end of the power supply, the output current for acquiring power supply
And generate current regulating signal；
The feedback circuit is connect with the frequency adjustable side of the master control IC, is received and is produced according to the current regulating signal
Raw feedback signal, and it is sent to the frequency adjustable side of the master control IC.
The present invention provides a kind of power supply, including the above-described control circuit for reducing constant-current supply short-circuit power.
The control circuit for implementing the reduction constant-current supply short-circuit power of the utility model, has the advantages that：This reality
With novel in the output terminal shortcircuit for detecting power supply, the impedance for reducing the frequency adjustable side of master control IC by dropping power circuit, into
And the working frequency of master control IC is improved, so that the output load capacity of complete machine reduces, the output power of power supply is reduced, makes secondary two
Pole pipe is operated in the state of a safety and stability, is improved power supply global reliability, stability and safety, is extended the longevity of power supply
Life.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is a kind of structure of control circuit embodiment one reducing constant-current supply short-circuit power provided by the utility model
Schematic diagram；
Fig. 2 is a kind of circuit diagram of control circuit reducing constant-current supply short-circuit power provided by the utility model.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing carries out
It is described in detail.
Refering to fig. 1, Fig. 1 is a kind of control circuit embodiment reducing constant-current supply short-circuit power provided by the utility model
One structural schematic diagram.The control circuit of the reduction constant-current supply short-circuit power of the present embodiment can be applied to the LED of constant current output
Power supply.
As shown in Figure 1, the control circuit of the reduction constant-current supply short-circuit power of the present embodiment may include：For adjusting electricity
The master control IC 30 of source output power；The drop being connect respectively with the feeder ear of the frequency adjustable side of master control IC 30 and master control IC 30
Power circuit 20；It is connect with drop power circuit 20, the power supply circuit 10 for providing operating voltage to drop power circuit 20；Work(drops
Rate circuit 20 is turned off when power supply works normally, and is connected and reduces the frequency tune of master control IC 30 in the output terminal shortcircuit of power supply
The impedance for saving end, to reduce the output power of power supply.
It should be noted that when power supply works normally, drop power circuit 20 is off state, to the work of power supply
Make and export several sections not have an impact.
Power supply circuit 10 may include auxiliary winding 101, rectifier diode, current-limiting resistance and the energy storage electricity of transformer
Hold.
The auxiliary winding 101 of transformer include first end and second end, the first end of the auxiliary winding 101 of transformer with it is whole
The anode connection of diode is flowed, the cathode of the second end ground connection of the auxiliary winding 101 of transformer, rectifier diode passes through current limliting electricity
Resistance is connect with drop power circuit 20, and the first end of storage capacitor and the cathode of rectifier diode connect, the second end of storage capacitor
It is connect with the second end of the auxiliary winding 101 of transformer, and the of the second end of storage capacitor and the auxiliary winding of transformer 101
The connecting node at two ends is grounded.
It is to be appreciated that when power supply works normally, mainly carried to master control IC 30 by the auxiliary winding of transformer 101
For the voltage needed for its work.When the output terminal shortcircuit of power supply, equally master control IC 30 is given by the auxiliary winding of transformer 101
Voltage needed for its work is provided.It should be noted that the master that the auxiliary winding 101 of transformer is provided when power supply works normally
The voltage that the is there is provided when voltage of control IC 30 is more than the output terminal shortcircuit of power supply, generally can reach more than ten to tens times or with
On.
When power supply works normally, after the first end output services voltage by the auxiliary winding 101 of transformer, rectifier diode
It is exported again after carrying out rectification.When the output terminal shortcircuit of power supply, 101 output voltage of auxiliary winding of transformer is very low, energy storage electricity
Hold both end voltage drastically to decline.
Power circuit 20 is dropped, may include turning circuit 201, bleeder circuit 202, first switch 203 and resistance R2.Its
In, the input terminal of turning circuit 201 is connect with current-limiting resistance, and the of the first output end of turning circuit 201 and bleeder circuit 202
One end connects, and the second output terminal of turning circuit 201 is connect with the feeder ear of master control IC 30.
The second end of bleeder circuit 202 is grounded, and the third end of bleeder circuit 202 is connect with the first end of first switch 203,
The second end of first switch 203 is connect with the frequency adjustable side of master control IC 30, and the third end of first switch 203 passes through resistance R2
Ground connection；Turning circuit 201 receives operating voltage and generates first voltage and second voltage based on operating voltage；Master control IC 30 connects
It receives second voltage and is worked according to second voltage；Bleeder circuit 202 receives first voltage and generates partial pressure letter based on first voltage
Number to first switch 203 to control the on or off of first switch 203.
Optionally, turning circuit 201 may include diode D1 and diode D2.
The anode of diode D1 is connect with current-limiting resistance, and the cathode of diode D1 is connect with bleeder circuit 202, diode D2
Anode connect with the anode of diode D1, the cathode of diode D2 is connect with the feeder ear of master control IC30；The sun of diode D1
The anode of pole and diode D2 are the input terminal of turning circuit 201, and the cathode of diode D1 is the first output of turning circuit 201
End, the cathode of diode D2 are the second output terminal of turning circuit 201.
Alternatively, bleeder circuit 202 may include divider resistance R1 and divider resistance R3.
The first end of divider resistance R1 is connect with the cathode of diode D1, second end and the divider resistance R3 of divider resistance R1
First end connection, the second end ground connection of divider resistance R3, connecting node between divider resistance R1 and divider resistance R3 also with
The first end of first switch 203 connects；The first end of divider resistance R1 is the first end of bleeder circuit 202, divider resistance R3's
Second end is the second end of bleeder circuit 202, and the connecting node between divider resistance R1 and divider resistance R3 is bleeder circuit 202
Third end.
It is to be appreciated that the node voltage between divider resistance R1 and divider resistance R3 is produced by bleeder circuit 202
Voltage division signal.When power supply works normally, the node voltage between divider resistance R1 and divider resistance R3 is high voltage, at this point,
The cut-off of first switch 203 (turns off), is not influenced on the normal work of master control IC 30；When the output terminal shortcircuit of power supply, partial pressure
Node voltage between resistance R1 and divider resistance R3 is low-voltage, and first switch 203 is connected, and then drags down master control IC's 30
The impedance of frequency adjustable side makes the working frequency of master control IC 30 increase, when the working frequency of master control IC 30 increases, power supply
Load capacity declines, and thereby reduces the output power of power supply.
First switch 203, may include triode Q1, the base stage and divider resistance R1 and divider resistance R3 of triode Q1 it
Between connecting node connection, the emitter of triode Q1 connect with the frequency adjustable side of master control IC 30, the collector of triode Q1
It is grounded by resistance R2.
The base stage of triode Q1 is the first end of first switch 203, the of the transmitting extremely first switch 203 of triode Q1
Two ends, the third end of the current collection extremely first switch 203 of triode Q1.
Alternatively, in the present embodiment, triode Q1 is PNP type triode, can by the on state characteristic of PNP type triode
Know, when its base voltage is low-voltage, triode can just be connected, and when its base voltage is high voltage, triode is in
Cut-off state (off state).Therefore, when the node voltage of divider resistance R1 and divider resistance R2 are low-voltage, triode Q1
Conducting；When the node voltage of divider resistance R1 and divider resistance R2 are high voltage, triode Q1 cut-offs (shutdown).
Further, the control circuit of the reduction constant-current supply short-circuit power of the present embodiment, which is characterized in that further include simultaneously
Joining resistance R104, the first end of parallel resistance R104 is connect with the frequency adjustable side of master control IC 30, and the second of parallel resistance R104
End ground connection.
It is to be appreciated that when short circuit occurs in the output end of power supply, triode Q1 is connected, at this time the emitter of triode Q1
With collector short circuit, resistance R2 is in parallel with parallel resistance R104, and then the impedance of the frequency adjustable side of master control IC 30 is made to decline,
Due to master control IC 30 working frequency and its frequency adjustable side impedance inversely, when the frequency of master control IC 30
When the impedance of adjustable side declines, working frequency improves, and the working frequency of master control IC 30 is to carry energy for adjusting the band of power supply
Power (i.e. output power), so, after the working frequency raising of master control IC 30, the load capacity of power supply accordingly declines, i.e. power supply
Output power decline.
Herein, it should be noted that the resistance value of resistance R2 can select to determine according to the working frequency of master control IC 30, pass through
The resistance R2 of the corresponding resistance value of selection can be obtained, in the working frequency of required master control IC 30, keeping the output end of power supply short
Lu Shi allows the output power of power supply preferably to be controlled, and the secondary diode of power supply is avoided to work overloadingly, and mitigates secondary
The stress pressure of grade diode.
Further, the control circuit of the short-circuit power of the permanent note power supply of the reduction of the present embodiment can also include respectively with master
The feedback regulating circuit 40 that the frequency adjustable side of control IC 30 is connected with the output end of power supply.
Feedback regulating circuit 40 may include feedback circuit 401 and current loop 402, wherein current loop 402 is anti-respectively
Current feed circuit 401 is connect with the output end of power supply, and the output current for acquiring power supply simultaneously generates current regulating signal.Feedback circuit
401 connect with the frequency adjustable side of master control IC 30, receive and generate feedback signal according to current regulating signal, and are sent to master
Control the frequency adjustable side of IC 30.
Monitoring in real time and current signal acquisition can be carried out to the electric current of the output end of power supply by the way that current loop 402 is arranged,
And current regulating signal is generated to feedback circuit 401 according to the current signal acquired, feedback signal is generated by feedback circuit 401
To master control IC 30, master control IC 30 adjusts the working frequency of its output according to the feedback signal received.
Optionally, the working frequency that master control IC 30 is exported is PWM working frequencies, the output power for adjusting power supply.
Referring to Fig.2, Fig. 2 is a kind of circuit of control circuit reducing permanent note power supply short circuit power provided by the utility model
Schematic diagram.
Wherein, power supply circuit 10 includes the auxiliary winding T1-B of transformer, rectifier diode D12, current-limiting resistance R13 and storage
Energy capacitance C1, drop power circuit 20 include diode D1, diode D2, divider resistance R1, divider resistance R3, triode Q1 and electricity
R2 is hindered, current loop 402 includes comparator U3-B, resistance R61, resistance R62, resistance R63, resistance R65, resistance R66, capacitance
C31, resistance R52 and diode D16, feedback circuit 401 include optocoupler U2 and resistance R37, wherein including U2 include U2-A and
U2-B.In the present embodiment, triode Q1 is PNP type triode.
As shown in Fig. 2, the first end of the auxiliary winding T1-B of transformer is connect with the anode of rectifier diode D12, rectification
The cathode of diode D12 is connect with the anode of the anode of diode D1 and diode D2 respectively by current-limiting resistance R93, energy storage electricity
The first end for holding C1 is connected between the cathode of rectifier diode D12 and current-limiting resistance R93, the second end of storage capacitor C1 and change
The second end of the auxiliary winding T1-B of depressor is connected and is connected to the ground.
The anode of diode D1 is connect with the anode of diode D2, the first end of the cathode and divider resistance R1 of diode D1
Connection, the second end of divider resistance R1 are connect with the first end of divider resistance R3, the second end ground connection of divider resistance R3, partial pressure electricity
The second end of resistance R1 is also connect with the base stage of triode Q1 with the connecting node of the first end of divider resistance R3, the moon of diode D2
Pole is connect with the feeder ear (VCC) of master control IC 30 (U1).The emitter of triode Q1 is adjusted with the frequency of master control IC 30 (U1)
(9 pins of PIN) connection, the collector of triode Q1 is held to be grounded by resistance R2.
The frequency adjustable side of master control IC 30 (U1) is also grounded by parallel resistance R104, the frequency tune of master control IC 30 (U1)
It saves end also to connect by the output end of resistance R37 and U2-B, the ground terminal ground connection of U2-B；U2-A power supply termination high level (+
8V), the input terminal of U2-A is connect with the anode of diode D16, and the cathode of diode D16 passes through resistance R52 and comparator U3-B
Output end connection, the positive input terminal of comparator U3-B connects reference voltage (2V5) by passing sequentially through resistance R62 and resistance R61,
The positive input terminal for comparing the U3-B that cries also is grounded by resistance R63.The negative input end of comparator U3-B passes through resistance R65 and power supply
Output end (being specially the negative output terminal of power supply) connection, the first end of resistance R66 are connect with the output end of comparator U3-B, resistance
The second end of R66 is connect by capacitance C31 with the negative input end of comparator U3-B.
As shown in Figure 2, the concrete operating principle of the control circuit of the permanent note power supply short circuit power of the reduction of the present embodiment is as follows：
Due to being provided with diode D2, high-tension resistive, which starts voltage (i.e. HV+), will not be transmitted to drop power circuit
20, the operating voltage for dropping power circuit 20 is provided by the auxiliary winding T1-B of transformer.
When power supply works normally, since the operating voltage that the auxiliary winding T1-B of transformer is provided is higher, work electricity
Pressure is after divider resistance R1 and divider resistance R3 partial pressures, obtained higher (the unlatching electricity higher than triode Q1 of node voltage
Pressure), the base stage of triode Q1 is high level, therefore, triode Q1 cut-offs (shutdown), to the normal work hardly shadow of power supply
It rings.
When the output terminal shortcircuit of power supply, storage capacitor C1 both end voltages drastically decline, through divider resistance R1 and divider resistance
After R2 partial pressures, obtained node voltage is relatively low, and the base stage of triode Q1 is low level, and triode Q1 is connected, and triode Q1 is led
After logical, resistance R2 and parallel resistance R104 are in parallel, and the impedance of the frequency adjustable side of master control IC30 (U1) declines, master control IC's 30
PWM working frequencies improve, and the load capacity of power supply can be made to decline after the PWM working frequencies raising of master control IC 30, and then reduce electricity
The output power in source makes secondary diode be operated in the state of a safety and stability, improves power supply global reliability, stability
And safety, extend the service life of power supply.
The utility model also provides a kind of power supply, including the above-described control electricity for reducing constant-current supply short-circuit power
Road.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should all belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of control circuit reducing constant-current supply short-circuit power, which is characterized in that including：
Master control IC for adjusting output power of power supply；
The drop power circuit being connect respectively with the feeder ear of the frequency adjustable side of the master control IC and the master control IC；
It is connect with the drop power circuit, the power supply circuit for providing operating voltage to the drop power circuit；
The drop power circuit is turned off when power supply works normally, and is connected and is reduced described in the output terminal shortcircuit of the power supply
The impedance of the frequency adjustable side of master control IC, to reduce the output power of power supply.
2. the control circuit according to claim 1 for reducing constant-current supply short-circuit power, which is characterized in that the power supply electricity
Road includes auxiliary winding, rectifier diode, current-limiting resistance and the storage capacitor of transformer；
The auxiliary winding of the transformer includes first end and second end, the first end of the auxiliary winding of the transformer with it is described
The anode of rectifier diode connects, the second end ground connection of the auxiliary winding of the transformer, and the cathode of the rectifier diode is logical
It crosses the current-limiting resistance to connect with the drop power circuit, the cathode of the first end of the storage capacitor and the rectifier diode
Connection, the second end of the storage capacitor are connect with the second end of the auxiliary winding of the transformer, and the storage capacitor
The connecting node of second end and the second end of the auxiliary winding of the transformer is grounded.
3. the control circuit according to claim 2 for reducing constant-current supply short-circuit power, which is characterized in that the drop power
Circuit includes turning circuit, bleeder circuit, first switch and resistance R2；
The input terminal of the turning circuit is connect with the current-limiting resistance, the first output end and the partial pressure of the turning circuit
The first end of circuit connects, and the second output terminal of the turning circuit is connect with the feeder ear of the master control IC；
The second end of the bleeder circuit is grounded, and the third end of the bleeder circuit is connect with the first end of the first switch,
The second end of the first switch is connect with the frequency adjustable side of the master control IC, and the third end of the first switch is described in
Resistance R2 ground connection；
The turning circuit receives the operating voltage and generates first voltage and second voltage based on the operating voltage；It is described
Master control IC receives the second voltage and is worked according to the second voltage；The bleeder circuit receives the first voltage and base
The on or off that voltage division signal controls the first switch to the first switch is generated in the first voltage.
4. the control circuit according to claim 3 for reducing constant-current supply short-circuit power, which is characterized in that the electric conduction
Road includes diode D1 and diode D2；
The anode of the diode D1 is connect with the current-limiting resistance, and cathode and the bleeder circuit of the diode D1 connect
It connects, the anode of the diode D2 is connect with the anode of the diode D1, the cathode of the diode D2 and the master control IC
Feeder ear connection；
The anode of the anode of the diode D1 and the diode D2 are the input terminal of the turning circuit, the diode D1
Cathode be the turning circuit the first output end, the cathode of the diode D2 is the second output of the turning circuit
End.
5. the control circuit according to claim 4 for reducing constant-current supply short-circuit power, which is characterized in that the partial pressure electricity
Road includes divider resistance R1 and divider resistance R3；
The first end of the divider resistance R1 is connect with the cathode of the diode D1, the second end of the divider resistance R1 and institute
State the first end connection of divider resistance R3, the second end ground connection of the divider resistance R3, the divider resistance R1 and the partial pressure
Connecting node between resistance R3 is also connect with the first end of the first switch；
The first end of the divider resistance R1 is the first end of the bleeder circuit, and the second end of the divider resistance R3 is described
The second end of bleeder circuit, the connecting node between the divider resistance R1 and the divider resistance R3 are the bleeder circuit
Third end.
6. the control circuit according to claim 5 for reducing constant-current supply short-circuit power, which is characterized in that described first opens
Pass includes triode Q1, the connection section between the base stage of the triode Q1 and the divider resistance R1 and the divider resistance R3
Point connection, the emitter of the triode Q1 are connect with the frequency adjustable side of the master control IC, the collector of the triode Q1
It is grounded by the resistance R2；
The base stage of the triode Q1 is the first end of the first switch, and the transmitting extremely described first of the triode Q1 is opened
The second end of pass, the third end of the extremely described first switch of current collection of the triode Q1.
7. the control circuit according to claim 6 for reducing constant-current supply short-circuit power, which is characterized in that further include parallel connection
Resistance R104, the first end of the parallel resistance R104 are connect with the frequency adjustable side of the master control IC, the parallel resistance
The second end of R104 is grounded.
8. the control circuit according to claim 1 for reducing constant-current supply short-circuit power, which is characterized in that further include difference
The feedback regulating circuit being connect with the output end of the frequency adjustable side of the master control IC and the power supply.
9. the control circuit according to claim 8 for reducing constant-current supply short-circuit power, which is characterized in that the feedback is adjusted
Economize on electricity road includes feedback circuit and current loop；
The current loop difference feedback circuit is connect with the output end of the power supply, the output current for acquiring power supply and production
Raw current regulating signal；
The feedback circuit is connect with the frequency adjustable side of the master control IC, is received and is generated according to the current regulating signal anti-
Feedback signal, and it is sent to the frequency adjustable side of the master control IC.
10. a kind of power supply, which is characterized in that reduce constant-current supply short-circuit power including claim 1-9 any one of them
Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820039326.9U CN207896864U (en) | 2018-01-10 | 2018-01-10 | A kind of control circuit and power supply reducing constant-current supply short-circuit power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820039326.9U CN207896864U (en) | 2018-01-10 | 2018-01-10 | A kind of control circuit and power supply reducing constant-current supply short-circuit power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207896864U true CN207896864U (en) | 2018-09-21 |
Family
ID=63551805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820039326.9U Active CN207896864U (en) | 2018-01-10 | 2018-01-10 | A kind of control circuit and power supply reducing constant-current supply short-circuit power |
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| Country | Link |
|---|---|
| CN (1) | CN207896864U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156195A1 (en) * | 2021-01-25 | 2022-07-28 | 长鑫存储技术有限公司 | Test board |
-
2018
- 2018-01-10 CN CN201820039326.9U patent/CN207896864U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156195A1 (en) * | 2021-01-25 | 2022-07-28 | 长鑫存储技术有限公司 | Test board |
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