CN209030096U - A kind of constant pressure and flow power-supplying circuit - Google Patents
A kind of constant pressure and flow power-supplying circuit Download PDFInfo
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- CN209030096U CN209030096U CN201821774022.3U CN201821774022U CN209030096U CN 209030096 U CN209030096 U CN 209030096U CN 201821774022 U CN201821774022 U CN 201821774022U CN 209030096 U CN209030096 U CN 209030096U
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Abstract
A kind of constant pressure and flow power-supplying circuit, for controlling the power supply of IC, including a voltage regulator circuit, one normal shock winding circuit, one flyback winding circuit, one sample circuit and a control circuit, the normal shock winding circuit and the flyback winding circuit provide two kinds of power supply modes for control IC, voltage regulator circuit for realizing normal shock winding circuit output pressure stabilizing, the sample circuit is used for sampling system output voltage, and a sampled voltage is exported to the control circuit, a threshold voltage is arranged in the control circuit, the sampled voltage is compared with the threshold voltage and exports the signal for being used to control that flyback winding circuit and normal shock winding circuit to be connected and disconnect by the control circuit.When system work is in constant voltage mode, circuit is powered by flyback winding circuit, can so improve the control power consumption and efficiency of system, and circuit is simple, easy to implement.
Description
Technical field
The utility model relates to field of power supplies, especially a kind of constant pressure and flow power-supplying circuit.
Background technique
In Switching Power Supply product of today, the product of constant current output occupies larger share, especially LED electricity in the industry
Source, charge power supply etc.；In order to meet the various demands of client, some products are in addition to should also have constant pressure with constant current mode
Mode can ensure that product being capable of steady operation under constant voltage mode.
Supply voltage Vcc about interiors of products control IC generally uses normal shock winding power, its advantage is that supply voltage
Vcc can be exported with transformer turns ratio, not changed with the change of output voltage, when there is output overcurrent, the shapes such as short circuit is abnormal
State all will not influence supply voltage Vcc, can guarantee that product works normally and protects product, but be the shortcomings that the method, when
When inputting high pressure, supply voltage will be excessively high to damage IC, therefore this just needs to solve the problems, such as this using voltage regulator circuit, however
Voltage regulator circuit meeting larger production loss, causes product no-load power consumption larger, efficiency is lower.If product I C is supplied using flyback operated type
Electricity, product no-load power consumption is lower, and efficiency is higher, but product will be unable to work in constant current mode, so few currently on the market
Have using flyback winding power, be all made of normal shock winding power mode, the problem of no-load power consumption and efficiency does not also obtain root
This solution.
Utility model content
In view of the above problems, the utility model provides a kind of constant pressure and flow power-supplying circuit, product normality is not influenced
Can, while improving the no-load power consumption and efficiency of product.
The technical solution adopted in the utility model are as follows:
A kind of constant pressure and flow power-supplying circuit, for the power supply for controlling IC, including a voltage regulator circuit, a normal shock around
Group circuit, a flyback winding circuit, a sample circuit and a control circuit, the sample circuit input terminal connection system voltage are defeated
Outlet, the sample circuit output end connect one input terminal of control circuit, described in one control terminal of the control circuit connection
Flyback winding circuit output end, another control terminal of control circuit connect the circuit output end of pressure-stabilizing, the voltage regulator circuit
Input terminal connects the normal shock winding circuit output end, the control circuit output end connection control IC feeder ear；
The normal shock winding circuit and the flyback winding circuit provide two kinds of power supply modes for control IC, and voltage regulator circuit is used
In the output pressure stabilizing for realizing normal shock winding circuit, the sample circuit is used for sampling system output voltage, and exports a sampling electricity
It is depressed into the control circuit, the control circuit is arranged a threshold voltage, and the control circuit is by the sampled voltage and the threshold value
Voltage is compared and exports the signal for controlling flyback winding circuit and normal shock winding circuit conducting and disconnection.
Preferably, the sample circuit includes resistance R1 and resistance R2, and the one end the resistance R1 is that the sample circuit is defeated
Enter end, the resistance R1 other end connects the one end the resistance R2, and the series connection point of the resistance R1 and resistance R2, which is used as, to be adopted
Sample circuit output end, resistance R2 other end connection ground.
Preferably, the control circuit includes comparator U1A, triode Q1, triode Q2 and a threshold voltage Vref, institute
Stating comparator U1A normal phase input end is the control circuit input terminal, and the comparator U1A inverting input terminal connects threshold voltage
Vref, the comparator U1A output end connect the triode Q1 base stage, the triode Q2 base stage, the triode simultaneously
Extremely described one control terminal of control circuit of Q1 current collection, the triode Q2 emit extremely described another control terminal of control circuit, institute
It states triode Q1 emitter and connects the triode Q2 collector, this tie point is the control circuit output end.
Preferably, the normal shock winding circuit includes a normal shock winding, diode D2, capacitor C2, and the normal shock winding is same
Name end connects the diode D2 anode, and the diode D2 cathode connects the one end the capacitor C2, this tie point be it is described just
Swash winding circuit output end, the capacitor C2 other end connects the normal shock Motor Winding Same Name of Ends and ground.
Preferably, the flyback winding circuit includes a flyback winding, diode D1, capacitor C1, and the flyback winding is same
Name end connects the diode D1 anode, and the diode D1 cathode connects the one end the capacitor C1, this tie point is described anti-
Swash winding circuit output end, the capacitor C1 other end connects the normal shock winding different name end and ground.
The design of the utility model are as follows:
System work is in two kinds of circuit-modes of constant pressure and constant current, the positive winding circuit and flyback winding electricity of the utility model
Road controls IC for system and provides normal shock and flyback two kinds of power supply modes, using sample circuit detection system output voltage, and passes through
Control circuit implements the control of two kinds of power supply modes according to the voltage signal of sampling, when system work is in constant voltage mode, by anti-
Swash winding circuit power supply, when system work in constant current mode, powered by normal shock winding circuit, so improvement product efficiency, sky
Carry power consumption.
Compared with prior art, the utility model has the following beneficial effects:
1) the utility model is simple, and number of devices is few, easily designed, at low cost convenient for debugging；
2) the utility model reduces product no-load power consumption, improves product efficiency；
3) the utility model power supply circuit does not influence the reliability of defencive function.
Detailed description of the invention
Fig. 1 is the functional block diagram of the utility model constant pressure and flow power-supplying circuit；
Fig. 2 is the circuit diagram of the real example of constant pressure and flow power-supplying circuit first of the utility model.
Specific embodiment
Fig. 1 is the functional block diagram of the utility model constant pressure and flow power-supplying circuit, a kind of constant pressure and flow power supply control electricity
Road, for controlling the power supply of IC, including a voltage regulator circuit, a normal shock winding, a flyback winding, a sample circuit and a control electricity
Road, the sample circuit input terminal connect system voltage output end, and the sample circuit output end connects the control circuit one
Input terminal, one control terminal of control circuit connect the flyback winding circuit output end, another control terminal of control circuit
The circuit output end of pressure-stabilizing is connected, the voltage regulator circuit input terminal connects the normal shock winding circuit output end, the control
Circuit output end connection control IC feeder ear；
The normal shock winding circuit and the flyback winding circuit provide two kinds of power supply modes for control IC, and voltage regulator circuit is used
In the output pressure stabilizing for realizing normal shock winding circuit, the sample circuit is used for sampling system output voltage, and exports a sampling electricity
It is depressed into the control circuit, the control circuit is arranged a threshold voltage, and the control circuit is by the sampled voltage and the threshold value
Voltage is compared and exports the signal for controlling flyback winding circuit and normal shock winding circuit conducting and disconnection.
In order to be better understood by the utility model, below with reference to specific embodiments and the drawings, to the utility model into one
Step is described in detail.
First embodiment
As shown in Fig. 2, being the circuit diagram of the utility model.
Sample circuit: including resistance R1, resistance R2；
Control circuit: including comparator U1A, triode Q1, triode Q2, output end GT, threshold voltage Vref；
Normal shock winding circuit: including normal shock winding, diode D2, capacitor C2；
Flyback winding circuit: including flyback winding, diode D1, capacitor C1；
IC power voltage supply end: VCC；
Ground terminal: SGND；
System voltage output end: Vo+
The connection relationship of each circuit are as follows:
The one end resistance R1 connection system voltage output end vo+, the resistance R1 other end connects the one end resistance R2, this tie point connects
Meet comparator U1A positive input, resistance R2 other end connection ground SGND.Resistance R1 and resistance R2 is divider resistance, for adopting
Sample system voltage output end voltage, and send sampled voltage to comparator U1A non-inverting input terminal, comparator reverse input end connects
Meet threshold voltage Vref, which is compared by comparator U1A with the threshold voltage, its output end GT export to
The base stage of triode Q1 and the base stage of triode Q2, for controlling the on-off of Q1 and triode Q2 before three-level.Triode Q1 transmitting
Pole and triode Q2 collector are connected to simultaneously controls IC power voltage supply end VCC, triode Q1 collector connection one end capacitor C1,
Diode D1 cathode, diode D1 anode connection flyback Motor Winding Same Name of Ends, the flyback winding different name end connection capacitor C1 other end,
Hold SGND.Triode Q2 emitter connects circuit output end of pressure-stabilizing, and voltage regulator circuit input terminal connects the one end capacitor C2, diode D2
Cathode, diode D2 anode connect normal shock winding different name end, normal shock Motor Winding Same Name of Ends connect the capacitor C2 other end, ground terminal SGND and
Voltage regulator circuit.
It should be noted that the voltage regulator circuit of the present embodiment is that the prior art often uses voltage regulator circuit, for realizing normal shock electricity
The pressure stabilizing on road exports, this example does not limit the particular circuit configurations of voltage regulator circuit.
The working principle of the present embodiment:
When system is in constant voltage mode work, system output voltage is higher, and the sampled voltage of output is given to by sample circuit
The positive input of comparator U1A in control circuit, comparator U1A normal phase input end voltage will be greater than its inverting input terminal electricity
It presses (as threshold voltage Vref), the output of comparator output at this time is high level (i.e. 2 in figure in the end GT be high level), so that three
Pole pipe Q1 conducting, triode Q2 cut-off, the supply voltage Vcc for controlling IC at this time are provided by flyback winding circuit, normal shock winding electricity
Road does not work, and product steady operation can be made in constant voltage mode, reduce product loss.
When product is in constant current mode or output voltage is lower (such as when overcurrent, short-circuit protection), system is defeated
Voltage is lower out, and the sampled voltage of sample circuit output is input to the positive input of the comparator in control circuit, comparator
Positive input voltage will be less than comparator inverting input terminal voltage (as threshold voltage), and comparator output terminal output at this time is
Low level, so that triode Q1 ends, triode Q2 conducting controls IC by normal shock winding circuit at this time and obtains supply voltage Vcc,
Flyback power supply circuit does not work at this time, and product steady operation can be made in constant current mode.
The present embodiment can work in constant voltage mode in system by the selection to two kinds of power supply modes, select flyback
Formula power supply, can be effectively reduced the no-load consumption of product, improve product systems efficiency.
Above are merely preferred embodiments of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For the limitation of the utility model, on the basis of the utility model Fig. 1 functional block diagram, for the ordinary skill people of the art
For member, without departing from the spirit and scope of the utility model, alternatively improved and retouching can also be made, such as will control
The circuit substitution of circuit amplifier and triode composition, is still able to achieve identical function, these are improved and retouching is also practical new at this
The protection scope of type, is no longer repeated with embodiment here, and the protection scope of the utility model should be defined by claim
Subject to range.
Claims (5)
1. a kind of constant pressure and flow power-supplying circuit, for controlling the power supply of IC, it is characterised in that: including a voltage regulator circuit, one
Normal shock winding circuit, a flyback winding circuit, a sample circuit and a control circuit, the sample circuit input terminal connect system
Voltage output end, the sample circuit output end connect one input terminal of control circuit, and one control terminal of control circuit connects
The flyback winding circuit output end is connect, another control terminal of control circuit connects the circuit output end of pressure-stabilizing, described steady
Volt circuit input terminal connects the normal shock winding circuit output end, the control circuit output end connection control IC feeder ear；
The normal shock winding circuit and the flyback winding circuit provide two kinds of power supply modes for control IC, and voltage regulator circuit is for real
The output pressure stabilizing of existing normal shock winding circuit, the sample circuit is used for sampling system output voltage, and exports a sampled voltage extremely
The control circuit, the control circuit are arranged a threshold voltage, and the control circuit is by the sampled voltage and the threshold voltage
It is compared and exports the signal for controlling flyback winding circuit and normal shock winding circuit conducting and disconnection.
2. constant pressure and flow power-supplying circuit according to claim 1, it is characterised in that: the sample circuit includes resistance
R1 and resistance R2, the one end the resistance R1 are the sample circuit input terminal, and the resistance R1 other end connects the resistance R2
The series connection point of one end, the resistance R1 and the resistance R2 are as sample circuit output end, resistance R2 other end connection ground.
3. constant pressure and flow power-supplying circuit according to claim 1, it is characterised in that: the control circuit includes comparing
Device U1A, triode Q1, triode Q2 and a threshold voltage Vref, the comparator U1A normal phase input end are the control circuit
Input terminal, the comparator U1A inverting input terminal connect threshold voltage Vref, and the comparator U1A output end connects institute simultaneously
Triode Q1 base stage, the triode Q2 base stage are stated, extremely described one control terminal of control circuit of the triode Q1 current collection is described
Triode Q2 emits extremely described another control terminal of control circuit, and the triode Q1 emitter connects the triode Q2 current collection
Pole, this tie point are the control circuit output end.
4. constant pressure and flow power-supplying circuit according to claim 1, it is characterised in that: the normal shock winding circuit includes
One normal shock winding, diode D2, capacitor C2, the normal shock Motor Winding Same Name of Ends connect the diode D2 anode, the diode
D2 cathode connects the one end the capacitor C2, this tie point is the normal shock winding circuit output end, and the capacitor C2 other end connects
Connect the normal shock Motor Winding Same Name of Ends and ground.
5. constant pressure and flow power-supplying circuit according to claim 1, it is characterised in that: the flyback winding circuit includes
One flyback winding, diode D1, capacitor C1, the flyback Motor Winding Same Name of Ends connect the diode D1 anode, the diode
D1 cathode connects the one end the capacitor C1, this tie point is the flyback winding circuit output end, and the capacitor C1 other end connects
Connect the normal shock winding different name end and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821774022.3U CN209030096U (en) | 2018-10-30 | 2018-10-30 | A kind of constant pressure and flow power-supplying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821774022.3U CN209030096U (en) | 2018-10-30 | 2018-10-30 | A kind of constant pressure and flow power-supplying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209030096U true CN209030096U (en) | 2019-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821774022.3U Active CN209030096U (en) | 2018-10-30 | 2018-10-30 | A kind of constant pressure and flow power-supplying circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417270A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of simplex winding Forward- flyback auxiliary power supply circuit |
| CN111082640A (en) * | 2019-12-13 | 2020-04-28 | 广州金升阳科技有限公司 | Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit |
| CN116488433A (en) * | 2023-06-21 | 2023-07-25 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
-
2018
- 2018-10-30 CN CN201821774022.3U patent/CN209030096U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417270A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of simplex winding Forward- flyback auxiliary power supply circuit |
| CN111082640A (en) * | 2019-12-13 | 2020-04-28 | 广州金升阳科技有限公司 | Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit |
| CN116488433A (en) * | 2023-06-21 | 2023-07-25 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
| CN116488433B (en) * | 2023-06-21 | 2023-09-12 | 成都智融微电子有限公司 | Auxiliary power supply circuit of switching power supply and control method thereof |
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