CN2924914Y - Soft start circuit for micro-power power module - Google Patents
Soft start circuit for micro-power power module Download PDFInfo
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- CN2924914Y CN2924914Y CN 200620059480 CN200620059480U CN2924914Y CN 2924914 Y CN2924914 Y CN 2924914Y CN 200620059480 CN200620059480 CN 200620059480 CN 200620059480 U CN200620059480 U CN 200620059480U CN 2924914 Y CN2924914 Y CN 2924914Y
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Abstract
The utility model provides a soft-starting circuit with the function of low-voltage and lose-control protection, which is used in mircopower power source module. The circuit is comprises a coupling transfer T, a MOSFET TR1, a surging transistor TR2 and insulating feedback machine of photoelectric coupling OC1. A soft start loop with the function of low-voltage and lose-control protection is arranged between the input end of the circuit and the collector of the transistor TR2. Base biasing resistor R7 is connected between the input end of the circuit and the base electrode of the transistor TR2. Functional mode of the utility model is clear, when the input voltage is lower than the rated work voltage of the circuit, the module is switched off. The utility model has advantages of the function of low-voltage and lose-control protection, few components and reliable work of the module.
Description
Technical field
The utility model relates to a kind of soft starting circuit that the micropower power supply module has low pressure lost-control protection function that is used for.
Background technology
Be commonly used in the circuit in the micropower power supply module at present, mostly be the anti exciting converter that obtains by the conversion of buck-boost converter, circuit structure as shown in Figure 1, comprise coupling transformer T, field effect transistor TR1, brilliant utmost point pipe TR2 and the photoelectricity coupling of vibrating isolated feedback device OC1, circuit input end connects the source electrode of field effect transistor TR1 through the primary coil P1 of coupling transformer T, circuit input end is connected the collector electrode of brilliant utmost point pipe TR2 with resistance R 2 through resistance R 1, the grid of field effect transistor TR1 is connected with the collector electrode of brilliant utmost point pipe TR2, the drain electrode one tunnel of field effect transistor TR1 is through resistance R 4 ground connection, another road is connected the base stage of brilliant utmost point pipe TR2 through the doublet of resistance R 3 and capacitor C 2, the base stage of brilliant utmost point pipe TR2 connects the emitter of photoelectricity coupling isolated feedback device OC1, the collector electrode of photoelectricity coupling isolated feedback device OC1 connects winding P4 through resistance R 8, realizes the power supply to photoelectricity coupling isolated feedback device OC1.The control utmost point of photoelectricity coupling isolated feedback device OC1 connects the output of the secondary output winding P3 of coupling transformer T through regulating circuit; Serial connection point between described resistance R 1 and the resistance R 2 is through the secondary winding P2 of speed-up capacitor C1, coupling transformer T ground connection.
The operation principle of sort circuit is to have used a simple photoelectricity coupling isolated feedback loop to come the control input end in the circuit.After input adds voltage, electric current directly flows through resistance R 1, R2 makes transistor T R1 be tending towards conducting, primary coil P1 has electric current to flow through, coupling makes the further conducting of transistor T R1 by winding P2, the positive voltage of winding P2 begins to pass on the transistor T R1 by speed-up capacitor C1, resistance R 2, so the drive current waveform forward position of transistor T R1 is very steep, help its quick conducting.After the transistor T R2 conducting, make the grid of transistor T R1 shunt, transistor T R1 will turn-off.Transistor T R1 closes and has no progeny, and the electric current that flows through its drain electrode is zero, thereby the pressure drop on the resistance R 4 is zero, and transistor T R2 will close, transistor T R1 conducting again.So circulation, circuit will produce self-oscillation, and by transformer electric weight will be passed to output.
The major defect of sort circuit is: when being lower than rated voltage input or work, the operating state of power module is not clear.Its reason is: input directly is added on the phototriode OC1 by resistance R 8.When transistor T R1 closes by the feedback request transistor T R2 conducting of photoelectrical coupler, because the collector electrode of phototriode OC1 directly is connected input by resistance R 8, thereby its input voltage low (being that input current is very little), the conducting degree of phototriode OC1 is not enough, thereby the emitter output current is also not enough, also closing of the conducting of oxide-semiconductor control transistors TR2 and TR1 well just.Will occur the phenomenon that output voltage constantly rises like this, the out-of-control phenomenon of output voltage also occur.
The utility model content
In order to overcome present technical deficiency, the utility model provides the soft starting circuit that has low pressure lost-control protection function in a kind of micropower power supply module.
For realizing above purpose; the utility model is achieved by following technical proposals; a kind of soft starting circuit with low pressure lost-control protection function; comprise coupling transformer T, field effect transistor TR1, the brilliant utmost point pipe TR2 of vibration and photoelectricity coupling isolated feedback device OC1; be connected with the soft start loop that is used to realize low pressure lost-control protection function between the collector electrode of circuit input end and brilliant utmost point pipe TR2, be connected with base biasing resistor R7 between the base stage of circuit input end and brilliant utmost point pipe TR2.
Soft start described in the utility model loop comprises resistance R 5, resistance R 6, voltage detector IC1, the other end of resistance R 5 one end connecting circuit inputs, resistance R 5 is through resistance R 6 series connection ground connection, voltage detector IC1 detects voltage input end and is connected with serial connection point between R5, the R6, the collector electrode of the brilliant utmost point pipe of voltage detector IC1 output termination TR2, the ground end ground connection of voltage detector IC1.
Soft start described in the utility model loop comprises resistance R 5, resistance R 6, voltage detector IC1, capacitor C 3, the other end of resistance R 5 one end connecting circuit inputs, resistance R 5 is through resistance R 6 series connection ground connection, voltage detector IC1 detects voltage input end and is connected with serial connection point between R5, the R6, the collector electrode of the brilliant utmost point pipe of voltage detector IC1 output termination TR2, the ground end ground connection of voltage detector IC1; Capacitor C 3 is connected between the serial connection point and ground between R5, the R6.
The utility model compared with prior art mainly contains following advantage:
1, this circuit working state is clear and definite, and when input voltage was lower than the operating voltage of circuit design, module was in off state;
2, has the low pressure lost-control protection;
3, simplicity of design is easy to realize physical circuit;
4, components and parts are few, and the module functional reliability is higher;
Description of drawings
Fig. 1 is the circuit theory diagrams of existing anti exciting converter;
Fig. 2 is the circuit theory diagrams of the utility model embodiment one;
Fig. 3 the utility model embodiment two circuit theory diagrams;
Fig. 4 the utility model embodiment three-circuit schematic diagram.
Embodiment
As shown in Figure 2, this enforcement 1 comprises coupling transformer T, field effect transistor TR1, brilliant utmost point pipe TR2 and the photoelectricity coupling of vibrating isolated feedback device OC1, circuit input end connects the source electrode of field effect transistor TR1 through the primary coil P1 of coupling transformer T, circuit input end is connected the collector electrode of brilliant utmost point pipe TR2 with resistance R 2 through resistance R 1, the grid of field effect transistor TR1 is connected with the collector electrode of brilliant utmost point pipe TR2, the drain electrode one tunnel of field effect transistor TR1 is through resistance R 4 ground connection, another road is connected the base stage of brilliant utmost point pipe TR2 through the doublet of resistance R 3 and capacitor C 2, the base stage of brilliant utmost point pipe TR2 connects the emitter of photoelectricity coupling isolated feedback device OC1, the collector electrode of photoelectricity coupling isolated feedback device OC1 connects winding P4 through resistance R 8, realizes the power supply to photoelectricity coupling isolated feedback device OC1.The control utmost point of photoelectricity coupling isolated feedback device OC1 connects the output of the secondary output winding P3 of coupling transformer T through regulating circuit; Serial connection point between described resistance R 1 and the resistance R 2 is through the secondary winding P2 of speed-up capacitor C1, coupling transformer T ground connection.
Between the base stage of foregoing circuit input a and brilliant utmost point pipe TR2, be connected with base biasing resistor R7; Be connected with the soft start loop that is used to realize low pressure lost-control protection function between the collector electrode of circuit input end and brilliant utmost point pipe TR2; this soft start loop comprises resistance R 5, resistance R 6, voltage detector IC1; the other end of resistance R 5 one end connecting circuit inputs, resistance R 5 is through resistance R 6 series connection ground connection; voltage detector IC1 detects voltage input end and is connected with serial connection point between R5, the R6; the collector electrode of the brilliant utmost point pipe of voltage detector IC1 output termination TR2, the ground end ground connection of voltage detector IC1.
A adds voltage when circuit input end, and electric current flow to the collector electrode of transistor T R1 through resistance R 1, resistance R 2, voltage detector IC1; When magnitude of voltage was lower than the specified input voltage of power module, voltage detector turn-offed, and this branch current is 0, and transistor is in off state.Have only the input voltage of working as in the rated value scope, the voltage detector conducting, transistor is just worked, and is in the operating state of design.Transistorized conducting voltage is set the dividing potential drop of each resistance and is controlled by the size of design resistance R 5, R6.The steady operation of module is no longer realized the shutoff of circuit or the control of conducting state by transistorized turn-on threshold, but the input voltage value by voltage inspection device IC1 testing circuit, when measured value equals design load, value is for true, circuit is in conducting state, otherwise circuit is in off state, thereby has guaranteed the definition of components and parts operating states better.
As shown in Figure 3, present embodiment two is basic identical with composition and the operation principle of embodiment one, difference is the soft start loop, this soft start loop comprises that soft start draws together resistance R 5, resistance R 6, voltage detector IC1, capacitor C 3, resistance R 5, resistance R 6 polyphone ground connection, the voltage detecting input of voltage detector IC1 is connected with serial connection point between R5, the R6, and voltage detector IC1 exports the collector electrode of termination crystalline substance utmost point pipe TR2, serial connection point between capacitor C 3 one termination R5, the R6, an end ground connection.Capacitor C 3 ground connection branch roads of series connection make the circuit of present embodiment two have the delayed startup function in resistance R 5 branch roads.
As shown in Figure 4, present embodiment three is identical with composition and the operation principle of embodiment two, and difference is the connection of voltage detector IC1, and the operating voltage of voltage detector IC1 provides by detecting input in embodiment two.The operating voltage link connecting circuit input a of voltage detector IC1 provides its operating voltage by circuit input end in embodiment two.
Claims (3)
1, the soft starting circuit in a kind of micropower power supply module; comprise coupling transformer T, field effect transistor TR1, the brilliant utmost point pipe TR2 of vibration and photoelectricity coupling isolated feedback device OC1; it is characterized in that: be connected with the soft start loop that is used to realize low pressure lost-control protection function between the collector electrode of circuit input end and brilliant utmost point pipe TR2, be connected with base biasing resistor R7 between the base stage of circuit input end and brilliant utmost point pipe TR2.
2, soft starting circuit according to claim 1, it is characterized in that, described soft start loop comprises resistance R 5, resistance R 6, voltage detector IC1, the other end of resistance R 5 one end connecting circuit inputs, resistance R 5 is through resistance R 6 series connection ground connection, voltage detector IC1 detects voltage input end and is connected with serial connection point between R5, the R6, the collector electrode of the brilliant utmost point pipe of voltage detector IC1 output termination TR2, the ground end ground connection of voltage detector IC1.
3, soft starting circuit according to claim 1, it is characterized in that, described soft start loop comprises resistance R 5, resistance R 6, voltage detector IC1, capacitor C 3, the other end of resistance R 5 one end connecting circuit inputs, resistance R 5 is through resistance R 6 series connection ground connection, voltage detector IC1 detects voltage input end and is connected with serial connection point between R5, the R6, the collector electrode of the brilliant utmost point pipe of voltage detector IC1 output termination TR2, the ground end ground connection of voltage detector IC1; Capacitor C 3 is connected between the serial connection point and ground between R5, the R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620059480 CN2924914Y (en) | 2006-05-26 | 2006-05-26 | Soft start circuit for micro-power power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620059480 CN2924914Y (en) | 2006-05-26 | 2006-05-26 | Soft start circuit for micro-power power module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2924914Y true CN2924914Y (en) | 2007-07-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620059480 Expired - Lifetime CN2924914Y (en) | 2006-05-26 | 2006-05-26 | Soft start circuit for micro-power power module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2924914Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135146A (en) * | 2014-07-29 | 2014-11-05 | 广州金升阳科技有限公司 | Soft starting method and circuit |
| CN104184332A (en) * | 2014-09-10 | 2014-12-03 | 广州优联电气科技有限公司 | Wide-input stabilized-voltage-output Royal circuit with feedback loop |
| CN104426345A (en) * | 2013-08-22 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | External soft start circuit of Buck converter |
-
2006
- 2006-05-26 CN CN 200620059480 patent/CN2924914Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426345A (en) * | 2013-08-22 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | External soft start circuit of Buck converter |
| CN104135146A (en) * | 2014-07-29 | 2014-11-05 | 广州金升阳科技有限公司 | Soft starting method and circuit |
| WO2016015566A1 (en) * | 2014-07-29 | 2016-02-04 | 广州金升阳科技有限公司 | Soft start method and circuit |
| CN104135146B (en) * | 2014-07-29 | 2017-02-15 | 广州金升阳科技有限公司 | Soft starting method and circuit |
| CN104184332A (en) * | 2014-09-10 | 2014-12-03 | 广州优联电气科技有限公司 | Wide-input stabilized-voltage-output Royal circuit with feedback loop |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070718 |
|
| EXPY | Termination of patent right or utility model |