CN202907293U - Flyback constant-current driving circuit and flyback constant-current driving control system containing same - Google Patents
Flyback constant-current driving circuit and flyback constant-current driving control system containing same Download PDFInfo
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- CN202907293U CN202907293U CN2012205685815U CN201220568581U CN202907293U CN 202907293 U CN202907293 U CN 202907293U CN 2012205685815 U CN2012205685815 U CN 2012205685815U CN 201220568581 U CN201220568581 U CN 201220568581U CN 202907293 U CN202907293 U CN 202907293U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a flyback constant-current driving circuit and a flyback constant-current driving control system containing the same. The driving circuit comprises a voltage regulator tube, a PWM control circuit and a first switch, wherein an anode of the voltage regulator tube is connected with a power supply port and a cathode of the voltage regulator tube is connected with a ground port; the PWM control circuit is connected with the power supply port, the ground port, a feedback port and a sampling port; a driving signal is generated according to a power supply signal received from the power supply port, a feedback signal received from the feedback port and a sampling signal received from the sampling port; and a control end of the first switch receives the driving signal, an input end of the first switch is connected with the feedback port and an output end of the first switch is connected with the sampling port. According to the flyback constant-current driving circuit and the flyback constant-current driving control system containing the same, the starting time can be shortened effectively, peripheral elements can reduced, and the system cost can be lowered.
Description
Technical field
The utility model relates to a kind of inverse-excitation type constant-current drive circuit and comprises its inverse-excitation type constant current driving control system.
Background technology
Fig. 1 shows traditional inverse-excitation type constant current driving control system, comprise: resistance R 1, capacitor C 1, diode D1, resistance R 2, resistance R 3, transformer T1(comprise former limit, secondary and auxiliary winding), metal-oxide-semiconductor M1, resistance R 4, diode D2, output capacitance C2, load LED lamp string and pulse-width modulation (PWM) control circuit 10.Wherein, a termination of resistance R 1 is received input voltage vin, and the other end of resistance R 1 connects an end, the negative pole of diode D1 and the power pin VCC of pwm control circuit 10 of capacitor C 1.The other end ground connection of capacitor C 1, the Same Name of Ends of the auxiliary winding of the cathode connecting transformer T1 of diode D1 and an end of resistance R 2, the different name end ground connection of the auxiliary winding of transformer T1, the feedback pin FB of another termination pwm control circuit 10 of resistance R 2, and link to each other the other end ground connection of resistance R 3 with an end of resistance R 3.The different name termination of the former limit winding of transformer T1 is received Vin, the drain terminal of termination MOS transistor M1 of the same name, the grid of MOS transistor M1 meets the driving pin DRV of pwm control circuit 10, the source electrode of MOS transistor M1 meets the sampling pin CS of pwm control circuit 10, and link to each other the other end ground connection of resistance R 4 with an end of resistance R 4.The positive pole of the terminating diode D2 of the same name of the secondary winding of transformer T1, the negative pole of diode D2 connect the end of output capacitance C2, and link to each other with an end of load LED lamp string, and the negative terminal of the other end of output capacitance C2 and load LED lamp string is connected together, altogether.Need to prove that for more directly perceived, Fig. 1 is illustrated in the auxiliary winding of transformer T1 near diode D1, is not in the same place and illustrate with auxiliary winding with former limit winding.
In conjunction with Fig. 1 and Fig. 2, the operation principle of inverse-excitation type constant current driving control system shown in Figure 1 is as follows: when this traditional constant current driving control system is working properly, drive pin DRV output high level, MOS transistor M1 conducting, the primary current of transformer T1 begins to rise by zero, the voltage of sampling pin CS rises, the voltage of feedback pin FB is low level, pwm control circuit 10 receives the signal of sampling pin CS and feedback pin FB input, Ton is after the time, and the voltage that drives pin DRV becomes low level, and the voltage of sampling pin CS becomes low level, the voltage of feedback pin FB uprises, and the auxiliary winding of transformer T1 charges to capacitor C 1 by diode D1 simultaneously.Pwm control circuit 10 receives the signal of sampling pin CS and feedback pin FB input, Toff1 is after the time, secondary current discharges into zero, the voltage of feedback pin FB begins to occur parasitic oscillation, the voltage of feedback pin FB is vibrating Toff2 after the time, the voltage of the driving pin DRV output of pwm control circuit 10 becomes high level, thereby enters next cycle.
In the constant current driving control system shown in Figure 1, what pwm control circuit 10 was exported is pulse signal, need to provide larger drive current to MOS transistor (being generally high-voltage tube) M1, therefore capacitor C 1 will be chosen higher value just can provide corresponding energy, thereby causes system longer required start-up time when starting.In addition, system shown in Figure 1 needs the auxiliary winding power supply of transformer, and also needing in addition has diode D1, causes the peripheral circuit cost higher.
The utility model content
The technical problems to be solved in the utility model provides a kind of inverse-excitation type constant-current drive circuit and comprises its inverse-excitation type constant current driving control system, can be by improving way to take power and drive pattern effectively reduces start-up time, and be conducive to reduce peripheral component, reduce system cost.
For solving the problems of the technologies described above, the utility model provides a kind of inverse-excitation type constant-current drive circuit, have power port, port, feedback port and sample port, comprising:
Voltage stabilizing module is connected between described power port and the ground port;
Pwm control circuit, with described power port, port, feedback port and sample port link to each other the feedback signal that receives according to the power supply signal that receives from described power port, from described feedback port and produce from the sampled signal that described sample port receives and to drive signal;
The first switch, its control end receive described driving signal, and its input connects described feedback port, and its output connects described sample port.
According to an embodiment of the present utility model, this inverse-excitation type constant-current drive circuit also comprises:
Comparator, its positive input terminal connects described power port, and its negative input end connects described feedback port;
Second switch, its control end connects the output of described comparator, and its input connects described feedback port, and its output connects the positive input terminal of described comparator.
According to the embodiment of the utility model embodiment, described second switch is MOS transistor, and its grid connects the output of described comparator, and its drain electrode connects described feedback port, and its source electrode connects the positive input terminal of described comparator.
According to an embodiment of the present utility model, described the first switch is MOS transistor, and its grid receives described driving signal, and its drain electrode connects described feedback port, and its source electrode connects described sample port.
According to an embodiment of the present utility model, described Voltage stabilizing module comprises voltage-stabiliser tube, its anodal described power port, its described ground of negative pole connection port of connecting.
The utility model also provides a kind of inverse-excitation type constant current driving control system, comprises above each described inverse-excitation type constant-current drive circuit, also comprises:
Starting resistance, its first end receives input voltage;
Start-up capacitance, its first end connect the second end of described starting resistance and the power port of described inverse-excitation type constant-current drive circuit, its second end ground connection;
Transformer, the different name termination of its former limit winding is received described input voltage;
The 3rd switch, its control end connect the second end of described starting resistance, and its input connects the Same Name of Ends of the former limit winding of described transformer, are connected the feedback port of described inverse-excitation type constant-current drive circuit with its output;
Sampling resistor, its first end connects the sample port of described inverse-excitation type constant-current drive circuit, and its second end connects ground port and the ground connection of described inverse-excitation type constant-current drive circuit;
Output diode, its anodal Same Name of Ends that connects the secondary winding of described transformer;
Output capacitance, its first end connects the negative pole of described output diode, and its second end connects different name end and the ground connection of the secondary winding of described transformer, and described output capacitance is configured in parallel with load.
According to an embodiment of the present utility model, described the 3rd switch is MOS transistor, its grid connects the second end of starting resistance, and its drain electrode connects the Same Name of Ends of the former limit winding of described transformer, and its output connects the feedback port of described inverse-excitation type constant-current drive circuit.
Compared with prior art, the utlity model has following advantage:
In the inverse-excitation type constant current driving control system of the utility model embodiment, the control end of the 3rd switch connects power port, for example the grid of MOS transistor connects power port, the power port power consumption is less, therefore start-up capacitance can use less capacitor element, is conducive to reduce system start-up time.
Further, can comprise comparator and second switch in the inverse-excitation type constant-current drive circuit of the utility model embodiment, thereby charge to power port in the time of can being higher than power port voltage at the voltage of feedback port, so that drive circuit does not need all from the input voltage power taking, utilize the parasitic energy of the 3rd switch to charge to power port, be conducive to raise the efficiency.
In addition, the transformer in the inverse-excitation type constant current driving control system of the utility model embodiment need not to possess auxiliary winding power supply, thereby has saved secondary main winding and corresponding diode, has reduced the components and parts cost of peripheral circuit.
Description of drawings
Fig. 1 is the circuit diagram of a kind of inverse-excitation type constant current driving control system in the prior art;
Fig. 2 is the signal waveforms of inverse-excitation type constant current driving control system shown in Figure 1;
Fig. 3 is the circuit diagram of the inverse-excitation type constant current driving control system of the utility model embodiment;
Fig. 4 is the signal waveforms of inverse-excitation type constant current driving control system shown in Figure 3;
Fig. 5 is the signal waveforms of inverse-excitation type constant current driving control system when not comprising comparator shown in Figure 3.
Embodiment
The utility model is described in further detail below in conjunction with specific embodiments and the drawings, but should not limit protection range of the present utility model with this.
With reference to figure 3, the inverse-excitation type constant current driving control system of present embodiment comprises: inverse-excitation type constant-current drive circuit 30, starting resistance R1, start-up capacitance C1, transformer T1, the 3rd switch M1, sampling resistor R2, output capacitance C2, load LED.
Wherein, the first end of starting resistance R1 receives input voltage vin, and the second end connects first end, the power port VCC of inverse-excitation type constant-current drive circuit 30 and the control end of the 3rd switch M1 of start-up capacitance C1.The second end ground connection of start-up capacitance C1.Starting resistance R1 and start-up capacitance C1 are used for doing startup usefulness to inverse-excitation type constant-current drive circuit 30, and give the inverse-excitation type constant-current drive circuit 30 power supplies.
The control end of the 3rd switch M1 connects the second end of starting resistance R1, the Same Name of Ends of the former limit winding of input connection transformer T1, and its output connects the feedback port FB of inverse-excitation type constant-current drive circuit 30.As a nonrestrictive example, the 3rd switch M1 can adopt MOS transistor to realize, it is the second end of the grid connection starting resistance R1 of MOS transistor M1, the Same Name of Ends of the former limit winding of its drain electrode connection transformer T1, its output connects the feedback port FB of inverse-excitation type constant-current drive circuit 30.
The different name termination of the former limit winding of transformer T1 is received input voltage vin, and the Same Name of Ends of primary coil connects the drain electrode of MOS transistor M1, and the Same Name of Ends of secondary winding connects the positive pole of output diode D2, the different name end ground connection of secondary winding.The negative pole of output diode D2 connects the first end of output capacitance C2, the second end ground connection of output capacitance C2, and output capacitance C2 can be configured in parallel with load LED.
The first end of sampling resistor connects the sample port CS of inverse-excitation type constant-current drive circuit 30, and the second end connects ground port GND and the ground connection of inverse-excitation type constant-current drive circuit 30.
Inverse-excitation type constant-current drive circuit 30 can comprise Voltage stabilizing module, pwm control circuit 32, the first switch M2, comparator 31, second switch M3.
Wherein, Voltage stabilizing module can be the voltage-stabiliser tube of a voltage-stabiliser tube or a plurality of series connection, and perhaps other have the suitable circuit structure of voltage stabilizing function.In the present embodiment, that Voltage stabilizing module specifically adopts is voltage-stabiliser tube D3, and the positive pole of this voltage-stabiliser tube D3 connects power port VCC, and negative pole connects ground port GND.Voltage-stabiliser tube D3 is used for the voltage of clamp supply port VCC.
Pwm control circuit 32 and power port VCC, port GND link to each other with sample port CS, the feedback signal that receives according to the power supply signal that receives from power port VCC, from feedback port FB and produce from the sampled signal that sample port CS receives and to drive signal, this drivings signal transfers to the control end of the first switch M2 via driving port DRV.
The control end of the first switch M2 receives the driving signal of the driving port DRV output of pwm control circuit 32, and input connects feedback port FB, and output connects sample port CS.The first switch M2 switches on off state under the control that drives signal, as a nonrestrictive example, the first switch M2 can adopt MOS transistor M2 to realize, the grid of MOS transistor M2 receives described driving signal, drain electrode connects feedback port FB, and its source electrode connects sample port CS.
The positive input terminal of comparator 31 connects power port VCC, and negative input end connects feedback port FB, and output connects the control end of second switch M3.The input of second switch M3 connects feedback port FB, and output connects the positive input terminal of comparator 31.As a nonrestrictive example, second switch M3 can adopt MOS transistor M3 to realize, the grid of MOS transistor M3 connects the output of comparator 31, and drain electrode connects feedback port FB, and source electrode connects the positive input terminal of comparator 31.
In conjunction with Fig. 3 and Fig. 4, the operation principle of the inverse-excitation type constant current driving control system of present embodiment is: when 30 normal operation of inverse-excitation type constant-current drive circuit, drive the driving signal high level of port DRV output, MOS transistor M2 conducting, the drain electrode of MOS transistor M2 is low level, because the voltage clamping of power port VCC is at the clamp voltage of voltage stabilizing didoe D3, be the direct current high level, MOS transistor M1 conducting, the primary current of transformer T1 begins to rise by zero, the voltage of sample port CS rises, the voltage of 31 couples of power port VCC of comparator and feedback port FB compares, the output high level, not conducting of MOS transistor M3, pwm control circuit 32 receives the signal of sample port CS and feedback port FB input, after the first ON time Ton, the voltage that drives port DRV becomes low level, and the voltage of feedback port FB is elevated to power port VCC and approaches at this moment, and the voltage of sample port CS becomes low level.The voltage of 31 couples of power port VCC of comparator and feedback port FB compares, the output high level, not conducting of MOS transistor M3, pwm control circuit 32 receives the signal of sample port CS and feedback port FB input, after the first turn-off time Toff1, the current discharge of secondary winding is to zero, feedback port FB begins to occur parasitic oscillation, within the half period of parasitic oscillation when the voltage of feedback port FB exceeds the voltage of power port VCC, the voltage of comparator 31 outputs overturns, MOS transistor M3 conducting, feedback port FB is to power port VCC charging, and feedback port FB is pulled low to the voltage of power port VCC approaching simultaneously.After vibration the second turn-off time Toff2, the driving signal of the driving port DRV output of pwm control circuit 32 becomes high level, thereby enters next cycle.
Need to prove that comparator 31 and MOS transistor M3 among Fig. 3 in the inverse-excitation type constant-current drive circuit 30 are optional.Fig. 5 shows the working signal waveform of inverse-excitation type constant current driving control system when not comprising comparator 31 and MOS transistor M3 shown in Figure 3, as seen from Figure 5, shake Toff2 in the time at parasitism, the voltage that can exceed power port VCC at the voltage of some time feedbacking port FB, after adding comparator 31 and MOS transistor M3, because the energy during MOS transistor M3 conducting on the feedback port FB can charge to power port VCC by MOS transistor M3, thereby so that system can self-powered, do not need to dispose auxiliary winding and power.
Still with reference to figure 3, in the driving control system in the present embodiment, power port VCC connects the grid of MOS transistor M1, and power port VCC power consumption is less, so input capacitance C1 can use less electric capacity, is conducive to reduce system start-up time.And, because the effect of comparator 31, utilize feedback port FB to charge to power port VCC in the time of can being higher than at the voltage of feedback port FB the voltage of power port VCC, so that drive circuit 30 does not need all from the high pressure power taking, utilize the parasitic energy of MOS transistor M1 to power port VCC power supply, thereby be conducive to raise the efficiency.In addition, the circuit structure of present embodiment does not need to use the auxiliary winding power supply of transformer, thereby has saved auxiliary winding and a corresponding diode, has reduced peripheral components and parts cost.
Although the utility model with preferred embodiment openly as above; but it is not to limit the utility model; any those skilled in the art are not within breaking away from spirit and scope of the present utility model; can make possible change and modification, therefore protection range of the present utility model should be as the criterion with the scope that the utility model claim is defined.
Claims (7)
1. inverse-excitation type constant-current drive circuit, have power port, port, feedback port and sample port, it is characterized in that, comprising:
Voltage stabilizing module is connected between described power port and the ground port;
Pwm control circuit, with described power port, port, feedback port and sample port link to each other the feedback signal that receives according to the power supply signal that receives from described power port, from described feedback port and produce from the sampled signal that described sample port receives and to drive signal;
The first switch, its control end receive described driving signal, and its input connects described feedback port, and its output connects described sample port.
2. inverse-excitation type constant-current drive circuit according to claim 1 is characterized in that, also comprises:
Comparator, its positive input terminal connects described power port, and its negative input end connects described feedback port;
Second switch, its control end connects the output of described comparator, and its input connects described feedback port, and its output connects the positive input terminal of described comparator.
3. inverse-excitation type constant-current drive circuit according to claim 2 is characterized in that, described second switch is MOS transistor, and its grid connects the output of described comparator, and its drain electrode connects described feedback port, and its source electrode connects the positive input terminal of described comparator.
4. inverse-excitation type constant-current drive circuit according to claim 1 is characterized in that, described the first switch is MOS transistor, and its grid receives described driving signal, and its drain electrode connects described feedback port, and its source electrode connects described sample port.
5. inverse-excitation type constant-current drive circuit according to claim 1 is characterized in that, described Voltage stabilizing module comprises voltage-stabiliser tube, its anodal described power port, its described ground of negative pole connection port of connecting.
6. an inverse-excitation type constant current driving control system is characterized in that, comprises each described inverse-excitation type constant-current drive circuit in the claim 1 to 5, also comprises:
Starting resistance, its first end receives input voltage;
Start-up capacitance, its first end connect the second end of described starting resistance and the power port of described inverse-excitation type constant-current drive circuit, its second end ground connection;
Transformer, the different name termination of its former limit winding is received described input voltage;
The 3rd switch, its control end connect the second end of described starting resistance, and its input connects the Same Name of Ends of the former limit winding of described transformer, are connected the feedback port of described inverse-excitation type constant-current drive circuit with its output;
Sampling resistor, its first end connects the sample port of described inverse-excitation type constant-current drive circuit, and its second end connects ground port and the ground connection of described inverse-excitation type constant-current drive circuit;
Output diode, its anodal Same Name of Ends that connects the secondary winding of described transformer;
Output capacitance, its first end connects the negative pole of described output diode, and its second end connects different name end and the ground connection of the secondary winding of described transformer, and described output capacitance is configured in parallel with load.
7. inverse-excitation type constant current driving control system according to claim 6, it is characterized in that, described the 3rd switch is MOS transistor, its grid connects the second end of described starting resistance, its drain electrode connects the Same Name of Ends of the former limit winding of described transformer, and its output connects the feedback port of described inverse-excitation type constant-current drive circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205685815U CN202907293U (en) | 2012-10-31 | 2012-10-31 | Flyback constant-current driving circuit and flyback constant-current driving control system containing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205685815U CN202907293U (en) | 2012-10-31 | 2012-10-31 | Flyback constant-current driving circuit and flyback constant-current driving control system containing same |
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| CN202907293U true CN202907293U (en) | 2013-04-24 |
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| CN2012205685815U Withdrawn - After Issue CN202907293U (en) | 2012-10-31 | 2012-10-31 | Flyback constant-current driving circuit and flyback constant-current driving control system containing same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892239A (en) * | 2012-10-31 | 2013-01-23 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
-
2012
- 2012-10-31 CN CN2012205685815U patent/CN202907293U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892239A (en) * | 2012-10-31 | 2013-01-23 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit |
| CN102892239B (en) * | 2012-10-31 | 2014-11-26 | 杭州士兰微电子股份有限公司 | Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN103354690B (en) * | 2013-08-07 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
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Granted publication date: 20130424 Effective date of abandoning: 20141126 |
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