CN201623634U - Switch-type power supply circuit with constant-voltage and constant-current feedback - Google Patents
Switch-type power supply circuit with constant-voltage and constant-current feedback Download PDFInfo
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- CN201623634U CN201623634U CN2009202678733U CN200920267873U CN201623634U CN 201623634 U CN201623634 U CN 201623634U CN 2009202678733 U CN2009202678733 U CN 2009202678733U CN 200920267873 U CN200920267873 U CN 200920267873U CN 201623634 U CN201623634 U CN 201623634U
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Abstract
A switch-type power supply circuit with constant-voltage and constant-current feedback comprises a rectifying unit, a PWM pulse width modulation control unit, a transformer, a constant-voltage unit, a feedback component and a constant-current unit, wherein the rectifying unit is connected to an alternating-current power supply, the constant-voltage unit is connected to a secondary side of the transformer, the feedback component is connected to the constant-voltage unit and the PWM pulse width modulation control unit, and the constant-current unit is connected to the secondary side of the transformer. The constant-current unit is provided with a reference voltage circuit, a voltage division circuit, a second reference voltage component and a detecting resistor, wherein the reference voltage circuit is connected to the secondary side of the transformer, the voltage division circuit is connected to the reference voltage circuit, and the second reference voltage component is connected to the voltage division circuit and the feedback component. Accordingly, the switch-type power supply circuit can achieve the effect of constant-voltage and constant-current feedback by a simple circuit structure, thereby having the advantage of low cost.
Description
Technical field
The utility model is relevant with power supply circuit, be meant especially a kind of have decide the switch mode power supply circuit that voltage is decided current feedback.
Background technology
In the daily life, most electric product is considered facility, safety and the cost in the use, all operates with the pattern of deciding voltage traditionally.And the switch mode power that adopts only considers that also the stability of output voltage gets final product when doing the conversion of electrical characteristic usually.
For LED (light-emitting diode) lighting technology of new rise at present, because LED assembly itself forward voltage and forward current can influence the life-span of LED assembly and the light source of stable output to the relation of temperature characterisitic, therefore need to use and decide current and power supply and make LED can reach optimization also can to improve power-efficient in the illumination occasion.
The switch mode power supply circuit of standard as shown in Figure 3, its circuit knot only has Voltage Feedback (utilize resistance R 4, R5 and press reference component U1), but so as to regulated output voltage.Therefore but the fixedly output of its size of current is applicable to the multiloop occasion of using in parallel, and must not surpass the maximum current of circuit output when using.If want the illumination of cooperated with LED assembly, then need to increase again one group of current limit circuit and protect, burn so that temperature is too high to avoid the LED electrical component to flow through greatly.
And the switching regulator constant-current circuit because the influence of circuit unit proof voltage security feature, still needs the work loop of restriction maximum output voltage basically, so can Duo one group of work loop than fixed voltage circuit in essence.The assembly that each manufacturer uses on the market is had nothing in common with each other, but basic skills is all identical, it partly is identical the stop voltage feedback loop, but is deciding then to consider on the current circuit the different and difference to some extent of detection element consumed power, feedback signal size, circuit working efficient and use occasion.
Circuit as shown in Figure 4, the circuit that its use is simplified, its zener diode ZD1 restriction output services voltage, the Vbe voltage 0.6v/R9 of transistor Q1 limits the output services electric current, and the overall work circuit is simplified the most.But the Vbe voltage of Q1 can cause the detection signal assembly R9 heating under big current work, and then reduces whole work efficiency and circuit is stable, and in addition, the Vbe of Q1 is temperature influence and drift makes circuit output services electric current instability easily again.
Refer again to circuit shown in Figure 5, it considers the precise and stable of output voltage and output current, and be provided with a stable Vref reference voltage in the inside of chip IC 1, consider the consumed power and the operating efficiency of resistance R 9, IC1 inside has work amplifier (OP Amp) to amplify the operating current signal that resistance R 9 assemblies detect, reduce the heat that pressure drop produced of big operating current on resistance R 9, and then increase the efficient of circuit and avoid this resistance R 9 to produce excessive heats and destroy the stability of circuit overall work.Because this circuit uses OP Amp assembly,, allow the circuit can steady operation so need increase by one group of working power loop (diode D3, capacitor C 6) assembly again.And IC1 uses application-specific integrated circuit (ASIC) to have the limited problem of cost problem and source manufacturer, if use multiple general purpose module work in combination, then can increase integrated circuit complexity and circuit cost.
Summary of the invention
Main purpose of the present utility model be to provide a kind of have decide the switch mode power supply circuit that voltage is decided current feedback, the effect that it can use simple circuit configuration to reach to decide voltage and decide current feedback, and it has advantage cheaply.
In order to reach aforementioned purpose, according to provided by the utility model a kind of have decide the switch mode power supply circuit that voltage is decided current feedback, include: a rectification unit is connected in an AC power; One pwm pulse width modulation control unit is connected in this rectification unit; One transformer, its primary side are connected in this rectification unit and this pwm pulse width modulation control unit; The certain voltage unit is connected in the secondary side of this transformer, and is connected in an output and an earth terminal; One feedback component is connected in this and decides voltage cell and this pwm pulse width modulation control unit; An and constant current unit, be connected in the secondary side of this transformer, this constant current unit has a reference voltage circuit, a bleeder circuit, one second reference voltage assembly and a detecting resistance, this reference voltage circuit is connected in the secondary side of this transformer, this bleeder circuit is connected in this reference voltage circuit, and this second reference voltage assembly is connected in this bleeder circuit and this feedback component.Can reach whereby and use simple circuit configuration to reach to decide voltage and decide the effect of current feedback, and then have advantage cheaply.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model first preferred embodiment.
Fig. 2 is the circuit structure diagram of the utility model second preferred embodiment.
Fig. 3 is the structure chart of existing power supply circuit.
Fig. 4 is the structure chart of another existing power supply circuit.
Fig. 5 is the structure chart of another existing power supply circuit.
Embodiment
In order to describe structure of the present utility model and characteristics place in detail, lift following preferred embodiment now and cooperate graphic explanation as after, wherein:
As shown in Figure 1, the utility model first preferred embodiment is provided a kind of have decide voltage and decide the switch mode power supply circuit of current feedback (10), mainly formed by a rectification unit (11), a pwm pulse width modulation control unit (21), a transformer (T1), certain voltage unit (31), a feedback component (41) and a constant current unit (51), wherein:
This rectification unit (11) is a bridge rectifier, is connected in an AC power (12).
This pwm pulse width modulation control unit (21) is a known pwm pulse width modulation control integrated circuit, is connected in this rectification unit (11).
This transformer (T1), its primary side are connected in this rectification unit (11) and this pwm pulse width modulation control unit (21).
Above-mentioned this rectification unit (11), this pwm pulse width modulation control unit (21) and this transformer (T1) be because of belonging to prior art, and seen in the prior art of this specification, its detailed structure and make flowing mode and hold and do not give unnecessary details.
Should decide voltage cell (31), and be connected in the secondary side of this transformer (T1), and be connected in an output (V+) and an earth terminal (GND).Should decide voltage cell (31) mainly by two divider resistances (R4) (R5), one the 3rd reference voltage assembly (U3), an electric capacity (C5) and a resistance (R3) formed, wherein the 3rd reference voltage assembly (U3) is connected in this two divider resistance (R4) (R5), this electric capacity (C5) is connected in the 3rd reference voltage assembly (U3) and this two divider resistance (R4) (R5), and this resistance (R3) then is connected in this feedback component (41) and this divider resistance (R4).
This feedback component (41) is an optical coupling assembly, is connected in this and decides voltage cell (31) and this pwm pulse width modulation control unit (21).
This constant current unit (51) is connected in the secondary side of this transformer (T1), and this constant current unit (51) has a reference voltage circuit (52), a bleeder circuit (54), one second reference voltage assembly (U2) and a detecting resistance (R9).This reference voltage circuit (52) is in series by one first reference voltage assembly (U1) and a resistance (R6), and being connected in the secondary side of this transformer (T1) with its series connection.This bleeder circuit (54) (R8) is made up of two resistance (R7), is connected in this reference voltage circuit (52), and this second reference voltage assembly (U2) is connected in this bleeder circuit (54) and this feedback component (41).Wherein, this first reference voltage assembly (U1), this second reference voltage assembly (U2) and the 3rd reference voltage assembly (U3) are an accurate reference voltage integrated circuit.
Next the flowing mode of doing of this first embodiment is described.
Electric current that this AC power (12) enters through this rectification unit (11) rectification after, carry out adjustment on the power through this pwm pulse width modulation control unit (21) again, promptly pass through the transformation of this transformer (T1) and enter to secondary side.Be positioned at secondary side should decide voltage cell (31) promptly by this two divider resistance (R4) dividing potential drop and stable reference voltage of being had of the 3rd reference voltage assembly (U3) itself (R5), and qualification output services voltage.
This constant current unit (51) that is positioned at secondary side then produces a reference voltage of accurately setting by this reference voltage circuit (52), and carry out dividing potential drop via this bleeder circuit (54), voltage level so as to this second reference voltage assembly (U2) setting of translation, and then produce a precise current feedback control signal and be sent to this pwm pulse width modulation control unit (21) via this feedback component (41), and the accurate position of the operating voltage that reduces this detecting resistance (R9), just increase the voltage gain of this detecting resistance (R9) for this reason just as the work amplifier of need not, and then reduced the power consumption that this detecting resistance (R9) produced of flowing through of big operating current.
Above-mentioned circuit is comparatively simple and can reach the feedback function of deciding voltage and deciding electric current, and does not use amplifier, therefore has advantage cheaply.
Please consult Fig. 2 again, the utility model second preferred embodiment is provided a kind of have decide voltage and decide the switch mode power supply circuit of current feedback (60), take off first embodiment before mainly generally being same as, difference is:
Should decide voltage cell (31 ') mainly by a zener diode (ZD1 ') and a resistance (R3 ') form.
This second embodiment and first embodiment only are that also this decides voltage cell (31 ') doing different on the flowing mode, mainly are to utilize this zener diode (ZD1 ') to come voltage is formed the effect that limits.This second embodiment has used simpler assembly to form to reach the effect of deciding voltage, the collocation of this kind zener diode and resistance, mainly can use under the situation of the stability of not considering circuit output voltage, this moment is with the circuit structure of this second embodiment, promptly had structure is more simple and cost is lower effect.
All the other of this second embodiment are done to take off first embodiment before flowing mode all generally is same as, and hold no longer to give and give unnecessary details.
As from the foregoing, the effect that the utility model can be reached is: circuit is comparatively simple and can reach the feedback function of deciding voltage and deciding electric current, and does not use amplifier, therefore has cheaply advantage.
Claims (7)
1. one kind has and decides the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that, includes:
One rectification unit is connected in an AC power;
One pwm pulse width modulation control unit is connected in this rectification unit;
One transformer, its primary side are connected in this rectification unit and this pwm pulse width modulation control unit;
The certain voltage unit is connected in the secondary side of this transformer, and is connected in an output and an earth terminal;
One feedback component is connected in this and decides voltage cell and this pwm pulse width modulation control unit; And
One constant current unit, be connected in the secondary side of this transformer, this constant current unit has a reference voltage circuit, a bleeder circuit, one second reference voltage assembly and a detecting resistance, this reference voltage circuit is connected in the secondary side of this transformer, this bleeder circuit is connected in this reference voltage circuit, and this second reference voltage assembly is connected in this bleeder circuit and this feedback component.
2. according to claim 1 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this reference voltage circuit is to be in series by one first reference voltage assembly and a resistance.
3. according to claim 2 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this first reference voltage assembly and this second reference voltage assembly are an accurate reference voltage integrated circuit.
4. according to claim 1 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this bleeder circuit is made up of two resistance.
5. according to claim 1 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this is decided voltage cell and mainly is made up of two divider resistances, one the 3rd reference voltage assembly, an electric capacity and a resistance, wherein the 3rd reference voltage assembly is connected in this two divider resistance, this electric capacity is connected in the 3rd reference voltage assembly and this two divider resistance, and this resistance then is connected in this feedback component and this divider resistance.
6. according to claim 1 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this is decided voltage cell and is made up of a zener diode and a resistance.
7. according to claim 1 have decide the switch mode power supply circuit that voltage is decided current feedback, it is characterized in that: this feedback component is an optical coupling assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202678733U CN201623634U (en) | 2009-10-15 | 2009-10-15 | Switch-type power supply circuit with constant-voltage and constant-current feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202678733U CN201623634U (en) | 2009-10-15 | 2009-10-15 | Switch-type power supply circuit with constant-voltage and constant-current feedback |
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| Publication Number | Publication Date |
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| CN201623634U true CN201623634U (en) | 2010-11-03 |
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| CN2009202678733U Expired - Fee Related CN201623634U (en) | 2009-10-15 | 2009-10-15 | Switch-type power supply circuit with constant-voltage and constant-current feedback |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986344A (en) * | 2014-05-30 | 2014-08-13 | 山东大学 | System and method for controlling unit power factor single-level AC-DC converter |
| CN107404791A (en) * | 2016-05-18 | 2017-11-28 | 立锜科技股份有限公司 | Multi-load control device and its slave circuit and control method |
| CN108063555A (en) * | 2016-11-07 | 2018-05-22 | 台达电子工业股份有限公司 | Multi-stage power source converter and its control method |
-
2009
- 2009-10-15 CN CN2009202678733U patent/CN201623634U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986344A (en) * | 2014-05-30 | 2014-08-13 | 山东大学 | System and method for controlling unit power factor single-level AC-DC converter |
| CN103986344B (en) * | 2014-05-30 | 2017-03-08 | 山东大学 | The control system of unity power factor single-stage AC DC isolated converter and control method |
| CN107404791A (en) * | 2016-05-18 | 2017-11-28 | 立锜科技股份有限公司 | Multi-load control device and its slave circuit and control method |
| CN107404791B (en) * | 2016-05-18 | 2019-08-30 | 立锜科技股份有限公司 | Multi-load control device and its slave circuit and control method |
| CN108063555A (en) * | 2016-11-07 | 2018-05-22 | 台达电子工业股份有限公司 | Multi-stage power source converter and its control method |
| CN108063555B (en) * | 2016-11-07 | 2020-04-03 | 台达电子工业股份有限公司 | Multi-stage power converter and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20111015 |