CN209134296U - A kind of started with high voltage and constant current circuit with soft start - Google Patents
A kind of started with high voltage and constant current circuit with soft start Download PDFInfo
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- CN209134296U CN209134296U CN201821795889.7U CN201821795889U CN209134296U CN 209134296 U CN209134296 U CN 209134296U CN 201821795889 U CN201821795889 U CN 201821795889U CN 209134296 U CN209134296 U CN 209134296U
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Abstract
The problem of the utility model discloses a kind of started with high voltage and constant current circuit with soft start solved in available circuit in the moment of circuit start, and the output electric current moment of start-up circuit increases, biggish dash current switch tube is caused to damage.The utility model by connecting a soft starting circuit in switch tube grid over the ground, in starting moment, the grid source voltage of switching tube slowly rises, the output circuit of start-up circuit is allowed to be slowly increased, to make constant-current source circuit have the enough reaction time, to control, electric current is stable to be exported, switching tube is damaged to avoid output dash current excessive, improves the reliability of product.
Description
Technical field
The utility model relates to a kind of start-up circuits applied to Switching Power Supply, more particularly to a kind of high voltage, wide model
Enclose the start-up circuit of input switch power supply.
Background technique
In recent years, with the rapid development of the power industries such as photovoltaic power generation, EHV transmission, the input electricity of distribution system
Press range very wide, down to one liang of hectovolt, up to several kilovolts, so system accessory power supply is difficult to design, especially high voltage startup
The design of circuit is extremely difficult.
In the prior art, as shown in Figure 1, being powered by a kind of started with high voltage and constant current circuit to power initiation, comprising: N grades
Equalizer circuit, voltage regulator circuit, N grade bleeder circuit, constant-current source circuit, switch protecting circuit, input source anode VIN+, input source are negative
Hold VIN- and output voltage terminal VCC, the natural number that N is >=2；Wherein:
N grades of equalizer circuits are as follows: resistance R1, R2 ... and Rn；Voltage regulator circuit are as follows: zener diode ZD1；N grades of bleeder circuits
Are as follows: metal-oxide-semiconductor Q1, zener diode ZD11, metal-oxide-semiconductor Q2, zener diode ZD12 ... and metal-oxide-semiconductor Qn, zener diode ZD1n；
Switch protecting circuit are as follows: triode Q21, resistance R21, resistance R31；
Constant-current source circuit are as follows: triode Q22, resistance R22, diode D1；N grades of equalizer circuits are for dividing equally input source voltage
Generate equal component voltage, N grades of bleeder circuits are used for the starting voltage that output switch power source needs, and voltage regulator circuit is used for so that output
Start voltage to keep stablizing, constant-current source circuit is used for so that output voltage terminal VCC is constant current output.
It is special in long-term reliability experiment although the circuit can be good at powering to high voltage power supply start-up circuit
It is not in long-term switching on and shutting down experiment, it has been found that in the moment of circuit start, the grid voltage between source electrodes moment of switching tube Qn reaches
The output electric current moment of the voltage relatively high to one, start-up circuit increases, and constant-current source circuit has little time to drag down switching tube at this time
The grid voltage of Qn has biggish dash current in the moment of starting so as to cause existing started with high voltage and constant current circuit, actual measurement
As shown in Fig. 2, switching tube is caused to damage failure because of overpower, when high temperature, is particularly acute wave mode, is unable to satisfy the reliable of product
Property demand.
Therefore, it is necessary to be improved to the prior art.
Utility model content
In view of this, the technical problems to be solved in the utility model is to provide a kind of higher Switching Power Supply starting of reliability
Circuit.
In order to solve the above technical problems, the utility model is realized by following technical measures:
A kind of started with high voltage and constant current circuit with soft start, including N grades of equalizer circuits, voltage regulator circuit, N grades of bleeder circuits,
Constant-current source circuit, switch protecting circuit, input source anode VIN+, input source negative terminal VIN- and output voltage terminal VCC, N are >=2
Natural number, input source anode VIN+ is successively through the 1st grade to N grades of equalizer circuits, the output end of pressure-stabilizing of voltage regulator circuit, voltage regulator circuit
Pressure stabilizing input terminal after be connected to input source negative terminal VIN-, input source anode VIN+ is also successively through the 1st grade to N grades of bleeder circuits
It is connected to the control terminal of constant-current source circuit afterwards, the 1st grade to N-1 grades of bleeder circuits of control terminal is connected to corresponding equalizer circuit
Equal pressure point, the control terminal of N grades of bleeder circuits are connected to the output end of pressure-stabilizing of voltage regulator circuit, the input terminal of switch protecting circuit and
The input terminal of constant-current source circuit is connected to the control terminal of N grades of bleeder circuits, and the output end of switch protecting circuit connects input source
Negative terminal VIN-, the output end of constant-current source circuit are output voltage terminal VCC；The circuit further includes soft starting circuit, soft starting circuit
One end connection voltage regulator circuit output end of pressure-stabilizing, the other end of soft starting circuit connects input source negative terminal VIN-.
Preferably, soft starting circuit is a capacitor.
Preferably, soft starting circuit further includes a diode, the output end of pressure-stabilizing of the anode of diode and voltage regulator circuit,
The control terminal of N grades of equalizer circuits is connected, and the cathode of diode is connected with one end of capacitor, and another termination input source of capacitor is negative
Hold VIN-.
As the same alternative of above scheme, a kind of started with high voltage and constant current circuit with soft start, including N grades pressed
Circuit, voltage regulator circuit, N grade bleeder circuit, constant-current source circuit, switch protecting circuit, input source anode VIN+, input source negative terminal
The natural number that VIN- and output voltage terminal VCC, N are >=2, input source anode VIN+ successively through the 1st grade to N grades of equalizer circuits,
Input source negative terminal VIN-, input source anode VIN are connected to after the output end of pressure-stabilizing of voltage regulator circuit, the pressure stabilizing input terminal of voltage regulator circuit
+ also successively it is connected to the control terminal of constant-current source circuit after the 1st grade to N grades of bleeder circuits, the 1st grade to N-1 grades of equal piezoelectricity
The control terminal on road is connected to the equal pressure point of corresponding equalizer circuit, and the control terminal of N grades of bleeder circuits is connected to the steady of voltage regulator circuit
Output end is pressed, the input terminal of switch protecting circuit and the input terminal of constant-current source circuit are connected to the control terminal of N grades of bleeder circuits,
The output end of switch protecting circuit connects input source negative terminal VIN-, and the output end of constant-current source circuit is output voltage terminal VCC；The electricity
Road further includes soft starting circuit, and one end of soft starting circuit connects the control terminal of N grades of bleeder circuits, soft starting circuit it is another
End connection output voltage terminal VCC.
Preferably, soft starting circuit is a capacitor.
Preferably, the capacitance of capacitor is 0.1uF grades to 1uF grades.
The utility model of the application is conceived: on the basis of existing started with high voltage and constant current circuit shown in Fig. 1, in switching tube
The grid of Qn connects a soft starting circuit over the ground, and in the moment of starting, the grid voltage between source electrodes of switching tube Qn slowly rise, and opens
The output electric current of dynamic circuit slowly increases, so that constant-current source circuit has the enough reaction time to control electric current and stablize output,
Switching tube is damaged to avoid output dash current excessive.
Compared with prior art, the utility model has the following beneficial effects:
1, this programme very good solution existing scheme opens the problem of machine immediate current overshoot；
2, the utility model increase device is seldom, and at low cost, easily designed, reliability is higher.
Detailed description of the invention
Fig. 1 is existing started with high voltage and constant current circuit diagram；
Fig. 2 is that the actual measurement of existing started with high voltage and constant current circuit overshoot exports current waveforms；
Fig. 3 is the circuit diagram of the utility model specific embodiment one；
Fig. 4 is the circuit actual measurement output current waveforms of the utility model specific embodiment one；
Fig. 5 is the circuit diagram of the utility model specific embodiment two；
Fig. 6 is the circuit diagram of the utility model specific embodiment three.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, further to the utility model in order to which the utility model is more clearly understood
It is described in detail.It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
Specific embodiment one
It is illustrated in figure 3 the circuit diagram of the utility model specific embodiment one, circuit is based on Fig. 1 circuit and is changed
Into Fig. 1 particular circuit configurations illustrate in the background technology, physical circuit connection relationship are as follows:
Input source anode VIN+ is successively through the 1st grade to N grades of equalizer circuits, the output end of pressure-stabilizing of voltage regulator circuit, pressure stabilizing electricity
Input source negative terminal VIN- is connected to after the pressure stabilizing input terminal on road, input source anode VIN+ is also successively through the 1st grade to N fraction piezoelectricity
The control terminal of constant-current source circuit is connected to behind road, the 1st grade to N-1 grades of bleeder circuits of control terminal is connected to corresponding equalizer circuit
Equal pressure point, the control terminal of N grades of bleeder circuits is connected to the output end of pressure-stabilizing of voltage regulator circuit, the input terminal of switch protecting circuit
The control terminal of N grades of bleeder circuits is connected to the input terminal of constant-current source circuit, the output end of switch protecting circuit connects input
Source negative terminal VIN-, the output end of constant-current source circuit are output voltage terminal VCC.
The present embodiment and Fig. 1 difference are as follows:
The circuit further include: soft starting circuit, soft starting circuit are made of a capacitor C1, one end connection figure of capacitor C1
The cathode of zener diode ZD1 in 1 available circuit, the other end connect input source negative terminal VIN-；
The capacitance of above-mentioned capacitor C1 is between 0.1uF to 1uF；
Working principle: as described in Figure 3, in the moment of starting, input source voltage VIN through resistance R1, R2 ..., Rn-1, Rn give
Soft start capacitor C1 slowly charges, and slowly increase the voltage on C1, that is, allow the grid voltage of switching tube Qn it is slow on
It rises, allows the output electric current of start-up circuit slowly to increase, measured waveform is as shown in figure 4, make constant-current source circuit Q22, R22 have foot
The enough reaction time controls electric current and stablizes output, thus avoid output dash current excessive and damage switching tube, start completion
Afterwards, soft start capacitor C1 discharges the energy of capacitor C1 by the Q21 of switch protecting circuit, in case realizing soft open when starting next time
It is dynamic.
Specific embodiment two
It is illustrated in figure 5 the circuit diagram of the utility model specific embodiment two, circuit composition and Fig. 3 difference
It is as follows:
Soft starting circuit is made of capacitor C1 and diode D2, the cathode of the anode of diode D2 and zener diode ZD1,
The control terminal of metal-oxide-semiconductor Qn is connected, and the cathode of diode D2 is connected with one end of capacitor C1, and another termination input source of capacitor C1 is negative
Hold VIN-；
The working principle with first embodiment of circuit are essentially the same after adjustment, and only constant-current source circuit drags down switch in control
When pipe Qn grid voltage exports electric current to stablize, do not influenced by soft start capacitor, this will not be repeated here.
Specific embodiment three
It is illustrated in figure 6 the circuit diagram of the utility model specific embodiment three, circuit composition and Fig. 3 difference
As follows: soft starting circuit is made of a capacitor C1, and the control terminal of one end connection metal-oxide-semiconductor Qn of capacitor C1, capacitor C1's is another
End connection output voltage terminal VCC；
The working principle of circuit is as first embodiment, it can be achieved that equivalent efficacy, this will not be repeated here after adjustment.
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 (7)
1. a kind of started with high voltage and constant current circuit with soft start, including N grades of equalizer circuits, voltage regulator circuit, N grades of bleeder circuits, perseverances
Current source circuit, switch protecting circuit, input source anode VIN+, input source negative terminal VIN- and output voltage terminal VCC, N are oneself of >=2
So number, input source anode VIN+ is successively through the 1st grade to N grades of equalizer circuits, the output end of pressure-stabilizing of voltage regulator circuit, voltage regulator circuit
Input source negative terminal VIN- is connected to after pressure stabilizing input terminal, input source anode VIN+ is also successively after the 1st grade to N grades of bleeder circuits
It is connected to the control terminal of constant-current source circuit, the 1st grade to N-1 grades of bleeder circuits of control terminal is connected to the equal of corresponding equalizer circuit
Pressure point, the control terminal of N grades of bleeder circuits are connected to the output end of pressure-stabilizing of voltage regulator circuit, the input terminal and perseverance of switch protecting circuit
The input terminal of current source circuit is connected to the control terminal of N grades of bleeder circuits, and the output end connection input source of switch protecting circuit is negative
VIN- is held, the output end of constant-current source circuit is output voltage terminal VCC；It is characterized by also including soft starting circuit, soft start electricity
The output end of pressure-stabilizing of one end connection voltage regulator circuit on road, the other end of soft starting circuit connect input source negative terminal VIN-.
2. the started with high voltage and constant current circuit according to claim 1 with soft start, it is characterised in that: soft starting circuit one
Capacitor.
3. the started with high voltage and constant current circuit according to claim 2 with soft start, it is characterised in that: the capacitance of capacitor is
0.1uF grades to 1uF grades.
4. the started with high voltage and constant current circuit according to claim 3 with soft start, it is characterised in that: soft starting circuit also wraps
A diode is included, the anode of diode is connected with the control terminal of the output end of pressure-stabilizing of voltage regulator circuit, N grades of equalizer circuits, and two
The cathode of pole pipe is connected with one end of capacitor, another termination input source negative terminal VIN- of capacitor.
5. a kind of started with high voltage and constant current circuit with soft start, including N grades of equalizer circuits, voltage regulator circuit, N grades of bleeder circuits, perseverances
Current source circuit, switch protecting circuit, input source anode VIN+, input source negative terminal VIN- and output voltage terminal VCC, N are oneself of >=2
So number, input source anode VIN+ is successively through the 1st grade to N grades of equalizer circuits, the output end of pressure-stabilizing of voltage regulator circuit, voltage regulator circuit
Input source negative terminal VIN- is connected to after pressure stabilizing input terminal, input source anode VIN+ is also successively after the 1st grade to N grades of bleeder circuits
It is connected to the control terminal of constant-current source circuit, the 1st grade to N-1 grades of equalizer circuits of control terminal is connected to the equal of corresponding equalizer circuit
Pressure point, the control terminal of N grades of bleeder circuits are connected to the output end of pressure-stabilizing of voltage regulator circuit, the input terminal and perseverance of switch protecting circuit
The input terminal of current source circuit is connected to the control terminal of N grades of bleeder circuits, and the output end connection input source of switch protecting circuit is negative
VIN- is held, the output end of constant-current source circuit is output voltage terminal VCC；It is characterized by also including soft starting circuit, soft start electricity
The one end on road connects the control terminal of N grades of bleeder circuits, and the other end of soft starting circuit connects output voltage terminal VCC.
6. the started with high voltage and constant current circuit according to claim 5 with soft start, it is characterised in that: soft starting circuit one
Capacitor.
7. the started with high voltage and constant current circuit according to claim 6 with soft start, it is characterised in that: the capacitance of capacitor is
0.1uF grades to 1uF grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821795889.7U CN209134296U (en) | 2018-11-02 | 2018-11-02 | A kind of started with high voltage and constant current circuit with soft start |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821795889.7U CN209134296U (en) | 2018-11-02 | 2018-11-02 | A kind of started with high voltage and constant current circuit with soft start |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209134296U true CN209134296U (en) | 2019-07-19 |
Family
ID=67233761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821795889.7U Active CN209134296U (en) | 2018-11-02 | 2018-11-02 | A kind of started with high voltage and constant current circuit with soft start |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209134296U (en) |
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2018
- 2018-11-02 CN CN201821795889.7U patent/CN209134296U/en active Active
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