CN107918429B - A kind of checking of great current feedback control circuit and control method - Google Patents
A kind of checking of great current feedback control circuit and control method Download PDFInfo
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- CN107918429B CN107918429B CN201711229172.6A CN201711229172A CN107918429B CN 107918429 B CN107918429 B CN 107918429B CN 201711229172 A CN201711229172 A CN 201711229172A CN 107918429 B CN107918429 B CN 107918429B
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
A kind of checking of great current feedback control circuit, including detection circuit, feed circuit and control circuit；The input terminal of the detection circuit is connected with the output end of power supply, and the output end of detection circuit is connected with the input terminal of feed circuit, and the output end of feed circuit is connected with the input terminal of control circuit, and the output end of control circuit is connected with the control terminal of power supply.It further include a kind of checking of great current feedback.Increase feed circuit in the level-one amplifying circuit and second amplifying circuit of checking of great current circuit, effect prevents power supply from protecting influence to use because electric current is excessive in beginning moment when power module output current is excessive.
Description
Technical field
The present invention relates to checking of great current technical field, specifically a kind of checking of great current feedback control circuit and control
Method processed.
Background technique
Existing current detection scheme can effectively examine current value, but more machines are simultaneously when electric current is larger
When powering on booting due to power supply single synchronous startup be unable to reach it is completely the same, then the power supply being preferentially switched on is likely to touch
OCP protection is sent out, there are risks.
Summary of the invention
The purpose of the present invention is to provide a kind of checking of great current feedback control circuit and control methods, for solving at present
The problem of triggering OCP protection is easy in checking of great current.
The technical scheme adopted by the invention to solve the technical problem is that:
A kind of checking of great current feedback control circuit, including detection circuit, feed circuit and control circuit；The detection
The input terminal of circuit is connected with the output end of power supply, and the output end of detection circuit is connected with the input terminal of feed circuit, feedback electricity
The output end on road is connected with the input terminal of control circuit, and the output end of control circuit is connected with the control terminal of power supply.
Further, the detection circuit includes filtering input circuit, level-one amplifying circuit, second amplifying circuit, leads to
Deenergizing, filtering output circuit；The input terminal of the filtering input circuit accesses DC power supply, filters the output of input circuit
End is connected with the input terminal of level-one amplifying circuit；The output end of level-one amplifying circuit and the input terminal of second amplifying circuit and on-off
The input terminal of circuit is connected；The output end of second amplifying circuit is connected with the input terminal of filtering output circuit；
The filtering input circuit includes resistance R75D, and one end of resistance R75D is connected with+12V_CS power supply, resistance
The other end of R75D is grounded；
The level-one amplifying circuit includes capacitor C34D, capacitor C35D, capacitor C36D, capacitor C37D, resistance R81D, electricity
Hinder R83D, resistance R84D, resistance R87D, amplifier IC4DC, mutual inductor T1；One end of capacitor C34D respectively with+12V power supply, mutually
One end of No. 5 pins, No. 2 pins of sensor T1, resistance R81D is connected；The other end of capacitor C34D and No. 4 of mutual inductor T1 are drawn
Foot, No. 1 pin are grounded；The other end of resistance R81D is connected with No. 10 pins of one end of capacitor C35D, amplifier IC4DC；
The other end of capacitor C35D is grounded；No. 9 pins of amplifier IC4DC respectively with one end of resistance R87D, resistance R84D one end,
One end of capacitor C36D is connected；No. 11 pins of amplifier IC4DC are grounded；No. 4 pins of amplifier IC4DC respectively with resistance
One end of R83D is connected with one end of capacitor C37D, the other end ground connection of another termination+12VS of resistance R83D, capacitor C37D；
The on-off circuit includes resistance R88D, resistance R77D, resistance R79D, resistance R89D, diode D9D, capacitor
C73D, capacitor C74D；One end of resistance R88D respectively with No. 8 pins, the other end of resistance R87D, capacitor of amplifier IC4DC
The other end of C36D, one end of resistance R77D, one end of resistance R89D are connected, the other end ground connection of resistance R88D；Resistance R77D
The other end respectively with one end of resistance R79D, one end of capacitor C73D, one end of capacitor C74D, diode D9D positive phase
Even；Cathode output+the 12VFB of diode D9D, the other end of resistance R79D, the other end of capacitor C73D, capacitor C74D it is another
End ground connection；
The second amplifying circuit include resistance R91D, resistance R92D, resistance R93D, resistance R96D, resistance R168D,
Potentiometer VR2D, potentiometer VR3D, capacitor C38D, capacitor C39D, amplifier IC4DD；One end of the resistance R91D and current potential
No. 3 pins of device VR2D are connected, and the other end of resistance R91D exports 2.5VREF；No. 2 pins and resistance R92D of potentiometer VR2D
One end be connected, the other end of resistance R92D respectively with one end of resistance R168D, one end of capacitor C39D, potentiometer VR3D 3
Number pin and No. 1 pin, No. 13 pins of amplifier IC4DD, resistance R94D one end be connected；No. 1 pin of potentiometer VR2D
Be connected with one end of resistance R93D, the other end of resistance R93D respectively with the other end of resistance R89D, No. 12 of amplifier IC4DD
Pin, one end of capacitor C38D are connected, the other end ground connection of capacitor C38D, the other end ground connection of resistance R94D；Potentiometer VR3D
No. 2 pins be connected with one end of resistance R96D；
The filtering output circuit includes resistance R97D, resistance R98D, capacitor C40D；Described one end resistance R97D point
Not with the other end of resistance R168D, the other end of capacitor C39D, the other end of resistance R96D, amplifier IC4DD No. 14 pins
It is connected and exports+12V_ISENSE；The resistance R97D other end is connected with one end of one end of resistance R98D and capacitor C40D respectively
And export+12V_IMON；The other end of resistance R98D and the other end ground connection of capacitor C40D.
Further, the feed circuit includes resistance R152D, resistance R153D, resistance R154D, resistance R29D, electricity
Hinder R30D, resistance R32D, resistance R34 D, resistance R35D, resistance R36D, resistance R39D, resistance R41D, resistance R61D, resistance
R44D, resistance R43D, resistance R177D, resistance R48D, resistance R178D, resistance R52D, resistance R45D, resistance R49D；Capacitor
C70D, capacitor C17D, capacitor C18D, capacitor C21D, amplifier IC4DA, amplifier IC4DB, potentiometer VR1D, diode
D21D, diode D4D；One end of resistance R153D is connected with one end of resistance R152D, the other end of resistance R153D respectively with electricity
One end of resistance R154D is connected with one end of capacitor C70D, and the other end of capacitor C70D is connected and divides with the other end of resistance R152D
It is not connected with one end of No. 1 pin of potentiometer VR1D, resistance R30D, the other end and diode D21D of resistance R154D is just
Extremely it is connected, the cathode of diode D21D draws with one end of resistance R35D, one end of resistance R29D, No. 3 of amplifier IC4DA respectively
Foot, one end of resistance R30D, one end of resistance R32D are connected；The other end of resistance R29D draws with No. 3 of potentiometer VR1D respectively
Foot and No. 2 pins are connected；No. 2 pins, No. 1 pin of amplifier IC4DA is connected and exports+12V_FB；Resistance R32D's is another
End is connected with one end of one end of resistance R36D, resistance R34 D respectively；Other end output+the 12V_ADJ of resistance R34 D；Resistance
The other end of R36D is connected with one end of No. 7 pins of amplifier IC4DB, one end of capacitor C17D, resistance R39D respectively, amplification
No. 5 pins of device IC4DB are connected with one end of one end of capacitor C21D, one end of resistance R41D, resistance R61D respectively；Amplifier
No. 6 pins of IC4DB are connected with one end of the other end of capacitor C17D, the other end of resistance R39D, resistance R44D respectively；Capacitor
The other end of C21D, the other end of resistance R41D are connected and are grounded；The other end of resistance R61D respectively with one end of resistance R43D,
The anode of diode D4D is connected；The other end of resistance R43D respectively with one end of resistance R177D, one end of resistance R48D, resistance
One end of R178D is connected；The cathode of diode D4D is connected with one end of one end of resistance R52D, resistance R45D respectively；Resistance
One end of R44D is connected with one end of resistance R49D and exports+12V_RS-；The other end of resistance R45D is another with resistance R49D's
End is connected and is grounded；The other end of resistance R52D be connected with one end of the other end of resistance R177D and capacitor C18D and exports+
12V_F；Other end output+the 12V of resistance R48D；Other end output+the 12V_RS+ of resistance R178D；The other end of capacitor C18D
It is connected with the other end of resistance R35D；One end input+12VFB of resistance R29.
Further, the control circuit includes CM6901 chip, resistance R11D, capacitor C6D；CM6901 chip it is defeated
Enter end to be connected with+12V_FB signal；The output end of CM6901 chip one end phase with one end of resistance R11D and capacitor C6D respectively
Even, the other end ground connection of capacitor C6D；Another termination+12VS power supply of resistance R11D.
A kind of checking of great current feedback, using the circuit, specifically includes the following steps:
The voltage signal of real-time monitoring input；
When voltage signal is more than voltage threshold, on-off circuit is connected；
The excessive signal of voltage is fed back to feed circuit by on-off circuit；
Feed circuit sends a signal to control circuit；
The output of control circuit control DC power supply.
Further, the concrete mode of on-off circuit is connected are as follows:
When voltage is excessive, diode D9D is connected, output+12VFB signal.
Further, the size of the voltage threshold depends on divider resistance R77D and R79D.
Further, the method that feed circuit sends a signal to control circuit specifically includes:
By amplifier IC4DA by voltage output to+12V_FB after the input of+12VFB signal ,+12V_FB feeds back to control
Circuit.
What the above summary of the invention provided is only the statement of the embodiment of the present invention, rather than invents itself.
The effect provided in summary of the invention is only the effect of embodiment, rather than invents all whole effects, above-mentioned
A technical solution in technical solution have the following advantages that or the utility model has the advantages that
Increase feed circuit in the level-one amplifying circuit and second amplifying circuit of checking of great current circuit, works as power module
Effect prevents power supply from protecting influence to use because electric current is excessive in beginning moment when output electric current is excessive.
Detailed description of the invention
Attached drawing described herein is used to provide that of the invention is explained further, and constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the composite structural diagram of current checking of great current circuit；
Fig. 2 is current checking of great current circuit；
Fig. 3 is the detection circuit of the embodiment of the present invention；
Fig. 4 is the feed circuit of the embodiment of the present invention；
Fig. 5 is the control circuit of the embodiment of the present invention；
Fig. 6 is the method flow schematic diagram of the embodiment of the present invention.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its attached drawing is combined, to this
Invention is described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
For a clearer understanding of the present invention, Fig. 1 and Fig. 2 are the explanations done to the prior art of the present invention.
As depicted in figs. 1 and 2, current rectifying and wave filtering circuit 1 is hindered the electric signal of Switching Power Supply by current transformer TA
Anti- isolation simultaneously exports；It can determine that electric current is mutual by adjusting the secondary coil of current transformer TA and the turn ratio of primary coil
The voltage swing of sensor TA output.
The rectification circuit being made up of diode carries out full-wave rectification to the electric signal that current transformer TA is exported, same with this
When, the current signal after full-wave rectification is converted to by voltage signal using resistance R1；In turn, electricity of the low-pass filter circuit to direct current
It presses signal to carry out low-pass filtering, the DC signal after low-pass filtering is exported from the output end of current rectifying and wave filtering circuit 1 to level-one
The input terminal of amplifying circuit 2.
The voltage value of the electric signal of power supply VCC1 output and the voltage value of the power supply VCC2 electric signal exported are different.Such as:
The voltage value of the electric signal of first power supply VCC1 output is 12V, and the voltage value of the electric signal of second source VCC2 output is 2.5V.
The electric signal inputted from the input terminal of level-one amplifying circuit 2 is amplified by the first amplifier chip U1；With
This can adjust amplification factor (for the first amplifier chip U1 output by adjusting the resistance value ratio of resistance R6 and resistance R7 simultaneously
Electric signal with from the input terminal of level-one amplifying circuit 2 input electric signal ratio).In turn, after resistance R9, from output
The end output amplified electric signal of level-one amplifying circuit 2.
Similarly with level-one amplifying circuit 2, it is amplified by the second amplifier chip U2 that second amplifying circuit 3 includes,
By adjusting the resistance value ratio of potentiometer VR2 and resistance R13, amplification factor is adjusted.
It is worth noting that current detecting is carried out to the high current of Switching Power Supply output to meet, by adjusting second
Potentiometer VR2 is corrected with the amplification factor to second amplifying circuit 3, and by adjusting the first potentiometer VR1 to two
The bias voltage of grade amplifying circuit 3 is corrected.To guarantee the voltage and switch electricity of the node IOUT after low-pass filtering
The electric current of source output is linear.
The first potentiometer VR1 is adjusted when the electric current of Switching Power Supply output is 20% fully loaded electric current；Multimeter to be used
Measure egress IOUT place voltage be the first predeterminated voltage (such as: 0.25V), and Switching Power Supply output electric current be 100%
When fully loaded electric current, the second potentiometer VR2 is adjusted；Voltage at multimeter measurement egress IOUT to be used is the second default electricity
Pressure (such as: 2V), and when the electric current of Switching Power Supply output is 20% fully loaded electric current, the first potentiometer VR1 is readjusted, so that
Multimeter measure the voltage at node IOUT be the first predeterminated voltage (such as: 0.25V)；This way it is secured that switch electricity
The electric current and node IOUT of source output are linear.
Can not cope in the prior art booting it is asynchronous when super-high-current to power supply bring OCP problem.It is of the invention thus
Provide a kind of checking of great current feedback control circuit, including detection circuit, feed circuit and control circuit；The detection electricity
The input terminal on road is connected with the output end of power supply, and the output end of detection circuit is connected with the input terminal of feed circuit, feed circuit
Output end be connected with the input terminal of control circuit, the output end of control circuit is connected with the control terminal of power supply.
As shown in figure 3, detection circuit includes filtering input circuit, level-one amplifying circuit, second amplifying circuit, power on/off
Road, filtering output circuit；The input terminal of the described filtering input circuit accesses DC power supply, filter the output end of input circuit with
The input terminal of level-one amplifying circuit is connected；The output end of level-one amplifying circuit and the input terminal of second amplifying circuit and on-off circuit
Input terminal be connected；The output end of second amplifying circuit is connected with the input terminal of filtering output circuit.
Filtering input circuit includes resistance R75D, and one end of resistance R75D is connected with+12V_CS power supply, and resistance R75D's is another
One end ground connection；
Level-one amplifying circuit includes capacitor C34D, capacitor C35D, capacitor C36D, capacitor C37D, resistance R81D, resistance
R83D, resistance R84D, resistance R87D, amplifier IC4DC, mutual inductor T1；One end of capacitor C34D respectively with+12V power supply, mutual inductance
One end of No. 5 pins, No. 2 pins of device T1, resistance R81D is connected；No. 4 pins of the other end of capacitor C34D and mutual inductor T1,
No. 1 pin is grounded；The other end of resistance R81D is connected with No. 10 pins of one end of capacitor C35D, amplifier IC4DC；Capacitor
The other end of C35D is grounded；No. 9 pins of amplifier IC4DC respectively with one end of resistance R87D, one end of resistance R84D, capacitor
One end of C36D is connected；No. 11 pins of amplifier IC4DC are grounded；No. 4 pins of amplifier IC4DC are respectively with resistance R83D's
One end is connected with one end of capacitor C37D, the other end ground connection of another termination+12VS of resistance R83D, capacitor C37D；
On-off circuit includes resistance R88D, resistance R77D, resistance R79D, resistance R89D, diode D9D, capacitor C73D, electricity
Hold C74D；One end of resistance R88D respectively with No. 8 pins of amplifier IC4DC, the other end of resistance R87D, capacitor C36D it is another
One end, one end of resistance R77D, one end of resistance R89D are connected, the other end ground connection of resistance R88D；The other end of resistance R77D
It is connected respectively with the anode of one end of resistance R79D, one end of capacitor C73D, one end of capacitor C74D, diode D9D；Diode
Cathode output+the 12VFB of D9D, the other end ground connection of the other end of resistance R79D, the other end of capacitor C73D, capacitor C74D；
Second amplifying circuit includes resistance R91D, resistance R92D, resistance R93D, resistance R96D, resistance R168D, potentiometer
VR2D, potentiometer VR3D, capacitor C38D, capacitor C39D, amplifier IC4DD；One end of the resistance R91D and potentiometer VR2D
No. 3 pins be connected, the other end of resistance R91D exports 2.5VREF；One end of No. 2 pins and resistance R92D of potentiometer VR2D
Be connected, the other end of resistance R92D respectively with one end of resistance R168D, one end of capacitor C39D, potentiometer VR3D No. 3 pins
It is connected with one end of No. 1 pin, No. 13 pins of amplifier IC4DD, resistance R94D；No. 1 pin and resistance of potentiometer VR2D
One end of R93D is connected, the other end of resistance R93D respectively with the other end of resistance R89D, amplifier IC4DD No. 12 pins,
One end of capacitor C38D is connected, the other end ground connection of capacitor C38D, the other end ground connection of resistance R94D；No. 2 of potentiometer VR3D
Pin is connected with one end of resistance R96D；
Filtering output circuit includes resistance R97D, resistance R98D, capacitor C40D；The one end resistance R97D respectively with resistance
The other end of R168D, the other end of capacitor C39D, the other end of resistance R96D, No. 14 pins of amplifier IC4DD are connected and defeated
+ 12V_ISENSE out；The resistance R97D other end be connected respectively with one end of one end of resistance R98D and capacitor C40D and exports+
12V_IMON；The other end of resistance R98D and the other end ground connection of capacitor C40D.
As shown in figure 4, feed circuit includes resistance R152D, resistance R153D, resistance R154D, resistance R29D, resistance
R30D, resistance R32D, resistance R34 D, resistance R35D, resistance R36D, resistance R39D, resistance R41D, resistance R61D, resistance R44D,
Resistance R43D, resistance R177D, resistance R48D, resistance R178D, resistance R52D, resistance R45D, resistance R49D；Capacitor C70D, electricity
Hold C17D, capacitor C18D, capacitor C21D, amplifier IC4DA, amplifier IC4DB, potentiometer VR1D, diode D21D, diode
D4D；One end of resistance R153D is connected with one end of resistance R152D, the other end of resistance R153D respectively with resistance R154D one
End is connected with one end of capacitor C70D, the other end of the other end of capacitor C70D and resistance R152D it is connected and respectively with potentiometer
No. 1 pin of VR1D, one end of resistance R30D are connected, and the other end of resistance R154D is connected with the anode of diode D21D, two poles
The cathode of pipe D21D respectively with one end of resistance R35D, one end of resistance R29D, amplifier IC4DA No. 3 pins, resistance R30D
One end, resistance R32D one end be connected；The other end of resistance R29D respectively with No. 3 pins of potentiometer VR1D and No. 2 pins
It is connected；No. 2 pins, No. 1 pin of amplifier IC4DA is connected and exports+12V_FB；The other end of resistance R32D respectively with resistance
One end of R36D, one end of resistance R34 D are connected；Other end output+the 12V_ADJ of resistance R34 D；The other end of resistance R36D point
It is not connected with one end of No. 7 pins of amplifier IC4DB, one end of capacitor C17D, resistance R39D, No. 5 of amplifier IC4DB are drawn
Foot is connected with one end of one end of capacitor C21D, one end of resistance R41D, resistance R61D respectively；No. 6 pins of amplifier IC4DB
It is connected respectively with one end of the other end of capacitor C17D, the other end of resistance R39D, resistance R44D；The other end of capacitor C21D,
The other end of resistance R41D is connected and is grounded；The other end of resistance R61D respectively with one end of resistance R43D, diode D4D just
Extremely it is connected；The other end of resistance R43D respectively with one end of resistance R177D, one end of resistance R48D, resistance R178D one end phase
Even；The cathode of diode D4D is connected with one end of one end of resistance R52D, resistance R45D respectively；One end of resistance R44D and electricity
One end of resistance R49D is connected and exports+12V_RS-；The other end of resistance R45D is connected and is grounded with the other end of resistance R49D；
The other end of resistance R52D is connected with one end of the other end of resistance R177D and capacitor C18D and exports+12V_F；Resistance R48D
Other end output+12V；Other end output+the 12V_RS+ of resistance R178D；The other end of capacitor C18D is another with resistance R35D's
One end is connected；One end input+12VFB of resistance R29.
As shown in figure 5, control circuit includes CM6901 chip, resistance R11D, capacitor C6D；The input terminal of CM6901 chip
It is connected with+12V_FB signal；The output end of CM6901 chip is connected with one end of one end of resistance R11D and capacitor C6D respectively,
The other end of capacitor C6D is grounded；Another termination+12VS power supply of resistance R11D.
As shown in fig. 6, a kind of checking of great current feedback, utilizes foregoing circuit, characterized in that specifically include with
Lower step:
The voltage signal of step 1) real-time monitoring input；
On-off circuit is connected when voltage signal is more than voltage threshold in step 2)；
The excessive signal of voltage is fed back to feed circuit by step 3) on-off circuit；
Step 4) feed circuit sends a signal to control circuit；
The output of step 5) control circuit control DC power supply.
The concrete mode of on-off circuit is connected are as follows:
When voltage is excessive, diode D9D is connected, output+12VFB signal.
The size of voltage threshold depends on divider resistance R77D and R79D.
The method that feed circuit sends a signal to control circuit specifically includes:
By amplifier IC4DA by voltage output to+12V_FB after the input of+12VFB signal ,+12V_FB feeds back to control
Circuit.
Control circuit judges whether to need to adjust 12V output voltage according to the signal value of input；If electric current is excessive ,+
12VFB is excessive, then reduces 12V voltage, limits the 12V electric current output of power module, while power supply being allowed to enter similar invariable power
Output mode waits power supply in parallel to adjust output and output voltage.It can control power supply and OCP do not occur in booting high current
Protect phenomenon.
The above is the preferred embodiment of the present invention, for those skilled in the art, In
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection scope.
Claims (7)
1. a kind of checking of great current feedback control circuit, characterized in that including detection circuit, feed circuit and control circuit；Institute
The input terminal for the detection circuit stated is connected with the output end of power supply, the input terminal phase of the output end and feed circuit of detection circuit
Even, the output end of feed circuit is connected with the input terminal of control circuit, and the output end of control circuit is connected with the control terminal of power supply；
The detection circuit is defeated including filtering input circuit, level-one amplifying circuit, second amplifying circuit, on-off circuit, filtering
Circuit out；The input terminal of the filtering input circuit accesses DC power supply, and the output end and level-one for filtering input circuit amplify
The input terminal of circuit is connected；The input terminal of the output end of level-one amplifying circuit and the input terminal of second amplifying circuit and on-off circuit
It is connected；The output end of second amplifying circuit is connected with the input terminal of filtering output circuit；
The filtering input circuit includes resistance R75D, and one end of resistance R75D is connected with+12V_CS power supply, resistance R75D's
Other end ground connection；
The level-one amplifying circuit includes capacitor C34D, capacitor C35D, capacitor C36D, capacitor C37D, resistance R81D, resistance
R83D, resistance R84D, resistance R87D, amplifier IC4DC, mutual inductor T1；One end of capacitor C34D respectively with+12V power supply, mutual inductance
One end of No. 5 pins, No. 2 pins of device T1, resistance R81D is connected；No. 4 pins of the other end of capacitor C34D and mutual inductor T1,
No. 1 pin is grounded；The other end of resistance R81D is connected with No. 10 pins of one end of capacitor C35D, amplifier IC4DC；Capacitor
The other end of C35D is grounded；No. 9 pins of amplifier IC4DC respectively with one end of resistance R87D, one end of resistance R84D, capacitor
One end of C36D is connected；No. 11 pins of amplifier IC4DC are grounded；No. 4 pins of amplifier IC4DC are respectively with resistance R83D's
One end is connected with one end of capacitor C37D, the other end ground connection of another termination+12VS of resistance R83D, capacitor C37D；
The on-off circuit include resistance R88D, resistance R77D, resistance R79D, resistance R89D, diode D9D, capacitor C73D,
Capacitor C74D；One end of resistance R88D respectively with No. 8 pins of amplifier IC4DC, the other end of resistance R87D, capacitor C36D
The other end, one end of resistance R77D, one end of resistance R89D are connected, the other end ground connection of resistance R88D；Resistance R77D's is another
End is connected with the anode of one end of resistance R79D, one end of capacitor C73D, one end of capacitor C74D, diode D9D respectively；Two poles
Cathode output+the 12VFB of pipe D9D, the other end ground connection of the other end of resistance R79D, the other end of capacitor C73D, capacitor C74D；
The second amplifying circuit includes resistance R91D, resistance R92D, resistance R93D, resistance R96D, resistance R168D, current potential
Device VR2D, potentiometer VR3D, capacitor C38D, capacitor C39D, amplifier IC4DD；One end of the resistance R91D and potentiometer
No. 3 pins of VR2D are connected, and the other end of resistance R91D exports 2.5VREF；No. 2 pins of potentiometer VR2D are with resistance R92D's
One end is connected, the other end of resistance R92D respectively with one end of resistance R168D, one end of capacitor C39D, No. 3 of potentiometer VR3D
Pin and No. 1 pin, No. 13 pins of amplifier IC4DD, resistance R94D one end be connected；No. 1 pin of potentiometer VR2D with
One end of resistance R93D is connected, and the other end of resistance R93D draws with the other end of resistance R89D, No. 12 of amplifier IC4DD respectively
Foot, one end of capacitor C38D are connected, the other end ground connection of capacitor C38D, the other end ground connection of resistance R94D；The 2 of potentiometer VR3D
Number pin is connected with one end of resistance R96D；
The filtering output circuit includes resistance R97D, resistance R98D, capacitor C40D；Described one end resistance R97D respectively with
The other end of resistance R168D, the other end of capacitor C39D, the other end of resistance R96D, No. 14 pins of amplifier IC4DD are connected
And export+12V_ISENSE；The resistance R97D other end is connected with one end of one end of resistance R98D and capacitor C40D and defeated respectively
+ 12V_IMON out；The other end of resistance R98D and the other end ground connection of capacitor C40D.
2. circuit according to claim 1, characterized in that the feed circuit include resistance R152D, resistance R153D,
Resistance R154D, resistance R29D, resistance R30D, resistance R32D, resistance R34 D, resistance R35D, resistance R36D, resistance R39D, resistance
R41D, resistance R61D, resistance R44D, resistance R43D, resistance R177D, resistance R48D, resistance R178D, resistance R52D, resistance
R45D, resistance R49D；Capacitor C70D, capacitor C17D, capacitor C18D, capacitor C21D, amplifier IC4DA, amplifier IC4DB, electricity
Position device VR1D, diode D21D, diode D4D；One end of resistance R153D is connected with one end of resistance R152D, resistance R153D
The other end be connected respectively with one end of one end of resistance R154D and capacitor C70D, the other end and resistance R152D of capacitor C70D
The other end be connected and be connected respectively with one end of No. 1 pin of potentiometer VR1D, resistance R30D, the other end of resistance R154D
Be connected with the anode of diode D21D, the cathode of diode D21D respectively with one end of resistance R35D, resistance R29D one end, put
No. 3 pins of big device IC4DA, one end of resistance R30D, one end of resistance R32D are connected；The other end of resistance R29D respectively with electricity
No. 3 pins of position device VR1D and No. 2 pins are connected；No. 2 pins, No. 1 pin of amplifier IC4DA is connected and exports+12V_FB；
The other end of resistance R32D is connected with one end of one end of resistance R36D, resistance R34 D respectively；The other end output of resistance R34 D+
12V_ADJ；The other end of resistance R36D respectively with No. 7 pins of amplifier IC4DB, one end of capacitor C17D, resistance R39D
One end be connected, No. 5 pins of amplifier IC4DB respectively with one end of capacitor C21D, one end of resistance R41D, resistance R61D one
End is connected；No. 6 pins of amplifier IC4DB respectively with the other end of capacitor C17D, the other end of resistance R39D, resistance R44D
One end is connected；The other end of capacitor C21D, the other end of resistance R41D are connected and are grounded；The other end of resistance R61D respectively with electricity
The anode of one end, diode D4D for hindering R43D is connected；The other end of resistance R43D respectively with one end of resistance R177D, resistance
One end of R48D, one end of resistance R178D are connected；The cathode of diode D4D respectively with one end of resistance R52D, resistance R45D
One end is connected；One end of resistance R44D is connected with one end of resistance R49D and exports+12V_RS-；The other end of resistance R45D with
The other end of resistance R49D is connected and is grounded；The one of the other end of resistance R52D and the other end of resistance R177D and capacitor C18D
End is connected and exports+12V_F；Other end output+the 12V of resistance R48D；Other end output+the 12V_RS+ of resistance R178D；Electricity
The other end for holding C18D is connected with the other end of resistance R35D；One end input+12VFB of resistance R29.
3. circuit according to claim 2, characterized in that the control circuit include CM6901 chip, resistance R11D,
Capacitor C6D；The input terminal of CM6901 chip is connected with+12V_FB signal；The output end of CM6901 chip respectively with resistance R11D
One end be connected with one end of capacitor C6D, the other end of capacitor C6D ground connection；Another termination+12VS power supply of resistance R11D.
4. a kind of checking of great current feedback utilizes circuit described in claim 1-3 any one, characterized in that
Specifically includes the following steps:
The voltage signal of real-time monitoring input；
When voltage signal is more than voltage threshold, on-off circuit is connected；
The excessive signal of voltage is fed back to feed circuit by on-off circuit；
Feed circuit sends a signal to control circuit；
The output of control circuit control DC power supply.
5. according to the method described in claim 4, it is characterized in that, the concrete mode of on-off circuit is connected are as follows:
When voltage is excessive, diode D9D is connected, output+12VFB signal.
6. according to the method described in claim 4, it is characterized in that, the size of the voltage threshold depends on divider resistance R77D
And R79D.
7. according to the method described in claim 4, it is characterized in that, the method that feed circuit sends a signal to control circuit is specific
Include:
By amplifier IC4DA by voltage output to+12V_FB after the input of+12VFB signal ,+12V_FB feeds back to control circuit.
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| CN104682676A (en) * | 2013-11-28 | 2015-06-03 | 北车大连电力牵引研发中心有限公司 | IGBT (Insulated Gate Bipolar Translator) driving protection circuit |
| CN206077221U (en) * | 2016-08-30 | 2017-04-05 | 北京精密机电控制设备研究所 | A kind of power supply electrifying current peak control circuit |
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| US9831768B2 (en) * | 2014-07-17 | 2017-11-28 | Crane Electronics, Inc. | Dynamic maneuvering configuration for multiple control modes in a unified servo system |
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|---|---|---|---|---|
| CN103475217A (en) * | 2013-09-06 | 2013-12-25 | 深圳Tcl新技术有限公司 | DC-DC circuit and overcurrent protection method thereof |
| CN104682676A (en) * | 2013-11-28 | 2015-06-03 | 北车大连电力牵引研发中心有限公司 | IGBT (Insulated Gate Bipolar Translator) driving protection circuit |
| CN203800802U (en) * | 2014-01-17 | 2014-08-27 | 中国长城计算机深圳股份有限公司 | Large current detection circuit and power source circuit |
| CN204156500U (en) * | 2014-10-10 | 2015-02-11 | 深圳市英威腾电气股份有限公司 | Overcurrent-overvoltage protecting circuit |
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| CN107918429A (en) | 2018-04-17 |
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