CN102843812A - Switch power supply - Google Patents
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- CN102843812A CN102843812A CN2011101713638A CN201110171363A CN102843812A CN 102843812 A CN102843812 A CN 102843812A CN 2011101713638 A CN2011101713638 A CN 2011101713638A CN 201110171363 A CN201110171363 A CN 201110171363A CN 102843812 A CN102843812 A CN 102843812A
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Abstract
The invention discloses a switch power supply, comprising an input module, a switching device, a filtering output circuit and a high-brightness LED (Light-Emitting Diode) lamp which are connected in sequence, wherein the high-brightness LED lamp, a voltage feedback circuit, a PWM (Pulse-Width Modulation) control chip and a driving circuit are connected in sequence; the high-brightness LED lamp, a current amplifying circuit, a constant-current circuit, the PWM control chip and the driving circuit are connected in sequence; the input module is connected with an auxiliary power supply circuit; an output end of the auxiliary power supply circuit is respectively connected with the PWM control chip, the driving circuit, the constant-current circuit and the current amplifying circuit; and the PWM control chip and the driving circuit are connected with the switching device. With the adoption of the technical scheme disclosed by the invention, not only accurate constant-current driving of the high-brightness LED lamp be realized, but also the energy transmission can be finished by the switching device and an energy storing device.
Description
Technical field
The present invention relates to LED lamp lighting technical field, relate in particular to a kind of Switching Power Supply.
Background technology
Light-emitting diode (being LED) was invented the sixties in 20th century, and LED has advantages such as volume is little, the life-span is long, power consumption is low, reaction rate is fast, vibration strength is good, was widely used in fields such as signal indication, digital demonstration.Along with improving constantly of LED luminescent material technology, the development of high bright LED has obtained success, and especially succeeding in developing of the high bright LED of white light makes it use indoor and outdoor decoration even fields such as city street lamp illumination and domestic lighting widely.But the driving of high bright LED is the problem that needs solve, and the manufacturer's recommended of high bright LED adopts constant current drive mode.Mostly be in the high bright LED of small-power type of drive only single or several series connection that the mode through series connection fixed current limiting resistance realized controlling the electric current of high bright LED in the past; The shortcoming that this kind mode exists is when input voltage changes; The electric current that flows through high bright LED lamp alters a great deal; Influence the illumination of high bright LED lamp, and the very big power consumption of the current-limiting resistance of series connection existence, efficient is very low.Afterwards in order to realize the control of constant current accurately; The driving that a kind of linear constant current circuit realizes high bright LED lamp appears; This kind circuit can have been realized the constant-current driving of high bright LED lamp; But carry out constant current control because it regulates pressure drop through linearity adjustment pipe, linear adjustment pipe has pressure drop and electric current, produces very big power consumption.This can produce very lossy in the application of large-scale high bright LED street lamp or high bright LED Square Lamp, do not reach purpose of energy saving.
Summary of the invention
The objective of the invention is to propose a kind of Switching Power Supply, have high-conversion rate, not only can realize the accurate constant-current driving of high bright LED lamp, and can accomplish the transmission of energy through switching device and energy storage device.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of Switching Power Supply; Comprise input module, auxiliary power supply circuit, switching device, pwm chip and drive circuit, filtering output circuit, voltage feedback circuit, current amplification circuit, constant current loop and high bright LED lamp; Wherein, Input module, switching device, filtering output circuit and high bright LED lamp are connected successively; High bright LED lamp, voltage feedback circuit are connected with drive circuit with pwm chip successively, and high bright LED lamp, current amplification circuit, constant current loop are connected with drive circuit with pwm chip successively, and input module is connected with the auxiliary power supply circuit; The auxiliary power supply circuit output end is connected with current amplification circuit with drive circuit, constant current loop with pwm chip respectively, and pwm chip is connected with switching device with drive circuit.
The auxiliary power supply circuit further comprises the second triode Q2, the 16 resistance R 16, the first voltage-stabiliser tube Z1 and the 3rd filter capacitor E3; The 16 resistance R 16 is parallel on the second triode Q2 base stage and the collector electrode; The first voltage-stabiliser tube Z1 is connected between the second triode Q2 base stage and the simulation ground, and the 3rd filter capacitor E3 is parallel between the emitter and simulation ground of the second triode Q2.
Switching device and filtering output circuit further comprise the first filter capacitor E1, the first switch transistor T R1, the 14 resistance R the 14, the 15 driving resistor R15, the first diode D1, first inductance L 1, the second filter capacitor E2 and the first sampling resistor RS1; Wherein, The 14 resistance R 14 is connected between 1 pin and 3 pin of the first switch transistor T Rl; The 15 driving resistor R15 is connected between 1 pin and drive signal DRV+ of the first switch transistor T Rl; The first diode Dl is connected in 3 pin of the first switch transistor T Rl and simulates between the ground; The first inductance L l is connected between 3 pin and output VOUT+ of the first switch transistor T Rl, and the second filter capacitor E2 is connected between output VOUT+ and the simulation ground, and the first sampling resistor RSl is connected between output VOUT-and the simulation ground.
Pwm chip and drive circuit further comprise pwm chip U1, chip for driving U2, the first oscillation resistance R1, the first oscillating capacitance C1, the first triode Q1, second resistance R 2, the 3rd resistance R 3, the 3rd filter capacitor C3, the 4th filter capacitor C4, the 7th driving resistor R7, the 5th filter capacitor C5 and high-end current supply circuit; Wherein the first oscillation resistance R1 is connected between 8 pin and 4 pin of pwm chip U1; The first oscillating capacitance C1 is connected between 4 pin and 5 pin of pwm chip U1; The first triode Q1 is connected between 8 pin and 4 pin of pwm chip U1; Second resistance R 2 is connected between 3 pin of 1 pin and pwm chip U1 of the first triode Q1, and the 3rd resistance R 3 is connected between 3 pin and 5 pin of pwm chip Ul, and the 3rd filter capacitor C3 is connected between 7 pin and 5 pin of pwm chip U1; The 4th filter capacitor C4 is connected between 8 pin and 5 pin of pwm chip U1; The 7th driving resistor R7 is connected between 2 pin of 7 pin and chip for driving U2 of pwm chip U1, and the 5th filter capacitor C5 is connected between 1 pin and 4 pin of chip for driving U2, and high-end current supply circuit comprises the 3rd diode D3 and the 6th capacitor C 6 on 8 pin that are connected on chip for driving U2; The 7 pin output DRV+ drive signal of chip for driving U2; The 6 pin output DRV-drive signal of chip for driving U2,5 pin of pwm chip U1 connect simulation ground, and 8 pin of pwm chip U1 connect vref signal; 7 pin of pwm chip U1 connect the VCC signal, and 4 pin of chip for driving U2 connect simulation ground.
Current amplification circuit and constant current loop further comprise integrated transporting discharging U3; Be connected in the 13 resistance R 13 between 2 pin of the 11 resistance R 11 between 3 pin and the VOUT-of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and integrated transporting discharging U3 and be connected in 2 pin of integrated transporting discharging U3 and the ratio amplifying circuit that the 12 resistance R 12 between the simulation ground is formed current signals, be connected in the second diode D2 that the 7th capacitor C 7, the 8th capacitor C 8 and the 9th resistance R 9 between the tenth resistance R 10 between the 8th resistance R 8 between 5 pin and the vref signal of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and 6 pin, 7 pin that are connected in integrated transporting discharging U3 and 6 pin are formed between constant current loops, 7 pin that are connected in integrated transporting discharging U3 and the U1-1 signal.
Voltage feedback circuit further comprises the 4th resistance R 4 between the 5th resistance R 5 between 2 pin that are connected in VOUT+ and integrated transporting discharging U3,2 pin that are connected in integrated transporting discharging U3 and the simulation ground and the 6th resistance R 6 and second capacitor C 2 that is connected in l pin and 2 pin of pwm chip Ul.
High bright LED lamp comprises the high bright LED lamp illumination module that is perhaps composed in parallel to the LEDiN series connection by LED1 that is connected between output VOUT+ and the output VOUT-.
Adopted technical scheme of the present invention, not only can realize the accurate constant-current driving of high bright LED lamp, and can accomplish the transmission of energy through switching device and energy storage device; The efficient of drive circuit can reach on 95%; Reach the purpose of energy saving that reduces the wastage, control precision is accurate simultaneously, temperature stability good, the illumination of the high bright LED lamp of control that can be stable; Reduce the light decay of high bright LED lamp; Prolong the life-span of high bright LED lamp, voltage feedback circuit can guarantee stable output voltage, the high bright LED lamp of reliable protection.
Description of drawings
Fig. 1 is the structural representation of Switching Power Supply in the specific embodiment of the invention.
Fig. 2 is the auxiliary power supply circuit diagram of Switching Power Supply in the specific embodiment of the invention.
Fig. 3 is the switching device and the filtering output circuit figure of Switching Power Supply in the specific embodiment of the invention.
Fig. 4 is pwm chip and the drive circuit and the voltage feedback circuit figure of Switching Power Supply in the specific embodiment of the invention.
Fig. 5 is the current amplification circuit of Switching Power Supply in the specific embodiment of the invention and the circuit diagram of constant current loop.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
Main thought of the present invention be utilize a kind ofly ripe use for many years at power supply circle, reliable and stable Switching Power Supply pwm chip, realize the constant pressure and flow output function through expanding some drive circuit control switch devices, voltage feedback circuit, current amplification circuit, constant current loop.Power according to existing high bright LED lamp; For example the module that is combined into of the high bright LED lamp of 1W, 3W, 5W according to the configuration of module, is designed corresponding constant current Control current value through the resistance of adjustment sampling resistor RS1 and the magnification ratio of current amplifier; Realize the on-off mode constant-current driving work of high bright LED lamp; The loss of power device is very low, and the efficient of drive circuit is high, reaches to cooperate high bright LED lamp to realize purpose of energy saving.
Fig. 1 is the structural representation of Switching Power Supply in the specific embodiment of the invention.As shown in Figure 1; This Switching Power Supply comprises input module, auxiliary power supply circuit, switching device, pwm chip and drive circuit, filtering output circuit, voltage feedback circuit, current amplification circuit, constant current loop and high bright LED lamp; Wherein, Input module, switching device, filtering output circuit and high bright LED lamp are connected successively; High bright LED lamp, voltage feedback circuit are connected with drive circuit with pwm chip successively, and high bright LED lamp, current amplification circuit, constant current loop are connected with drive circuit with pwm chip successively, and input module is connected with the auxiliary power supply circuit; The auxiliary power supply circuit output end is connected with current amplification circuit with drive circuit, constant current loop with pwm chip respectively, and pwm chip is connected with switching device with drive circuit.
Fig. 2 is the auxiliary power supply circuit diagram of Switching Power Supply in the specific embodiment of the invention.As shown in Figure 2; This auxiliary power supply circuit further comprises the second triode Q2, the 16 resistance R 16, the first voltage-stabiliser tube Z1 and the 3rd filter capacitor E3; The 16 resistance R 16 is parallel on the second triode Q2 base stage and the collector electrode; The first voltage-stabiliser tube Z1 is connected between the second triode Q2 base stage and the simulation ground, and the 3rd filter capacitor E3 is parallel between the emitter and simulation ground of the second triode Q2.
Fig. 3 is the switching device and the filtering output circuit figure of Switching Power Supply in the specific embodiment of the invention.As shown in Figure 3; This switching device and filtering output circuit further comprise the first filter capacitor E1, the first switch transistor T R1, the 14 resistance R the 14, the 15 driving resistor R15, the first diode D1, first inductance L 1, the second filter capacitor E2 and the first sampling resistor RS1; Wherein, The 14 resistance R 14 is connected between 1 pin and 3 pin of the first switch transistor T Rl; The 15 driving resistor R15 is connected between 1 pin and drive signal DRV+ of the first switch transistor T Rl, and the first diode Dl is connected in 3 pin of the first switch transistor T Rl and simulates between the ground, and the first inductance L l is connected between 3 pin and output VOUT+ of the first switch transistor T Rl; The second filter capacitor E2 is connected between output VOUT+ and the simulation ground, and the first sampling resistor RSl is connected between output VOUT-and the simulation ground.
Fig. 4 is pwm chip and the drive circuit and the voltage feedback circuit figure of Switching Power Supply in the specific embodiment of the invention.As shown in Figure 4; This pwm chip and drive circuit further comprise pwm chip U1, chip for driving U2, the first oscillation resistance R1, the first oscillating capacitance C1, the first triode Q1, second resistance R 2, the 3rd resistance R 3, the 3rd filter capacitor C3, the 4th filter capacitor C4, the 7th driving resistor R7, the 5th filter capacitor C5 and high-end current supply circuit; Wherein the first oscillation resistance R1 is connected between 8 pin and 4 pin of pwm chip U1; The first oscillating capacitance C1 is connected between 4 pin and 5 pin of pwm chip U1; The first triode Q1 is connected between 8 pin and 4 pin of pwm chip U1; Second resistance R 2 is connected between 3 pin of 1 pin and pwm chip U1 of the first triode Q1, and the 3rd resistance R 3 is connected between 3 pin and 5 pin of pwm chip Ul, and the 3rd filter capacitor C3 is connected between 7 pin and 5 pin of pwm chip U1; The 4th filter capacitor C4 is connected between 8 pin and 5 pin of pwm chip U1; The 7th driving resistor R7 is connected between 2 pin of 7 pin and chip for driving U2 of pwm chip U1, and the 5th filter capacitor C5 is connected between 1 pin and 4 pin of chip for driving U2, and high-end current supply circuit comprises the 3rd diode D3 and the 6th capacitor C 6 on 8 pin that are connected on chip for driving U2; The 7 pin output DRV+ drive signal of chip for driving U2; The 6 pin output DRV-drive signal of chip for driving U2,5 pin of pwm chip U1 connect simulation ground, and 8 pin of pwm chip U1 connect vref signal; 7 pin of pwm chip U1 connect the VCC signal, and 4 pin of chip for driving U2 connect simulation ground.
Fig. 5 is the current amplification circuit of Switching Power Supply in the specific embodiment of the invention and the circuit diagram of constant current loop.As shown in Figure 5; This current amplification circuit and constant current loop further comprise integrated transporting discharging U3; Be connected in the 13 resistance R 13 between 2 pin of the 11 resistance R 11 between 3 pin and the VOUT-of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and integrated transporting discharging U3 and be connected in 2 pin of integrated transporting discharging U3 and the ratio amplifying circuit that the 12 resistance R 12 between the simulation ground is formed current signals, be connected in the second diode D2 that the 7th capacitor C 7, the 8th capacitor C 8 and the 9th resistance R 9 between the tenth resistance R 10 between the 8th resistance R 8 between 5 pin and the vref signal of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and 6 pin, 7 pin that are connected in integrated transporting discharging U3 and 6 pin are formed between constant current loops, 7 pin that are connected in integrated transporting discharging U3 and the U1-1 signal.
Voltage feedback circuit further comprises the 4th resistance R 4 between the 5th resistance R 5 between 2 pin that are connected in VOUT+ and integrated transporting discharging U3,2 pin that are connected in integrated transporting discharging U3 and the simulation ground and the 6th resistance R 6 and second capacitor C 2 that is connected in l pin and 2 pin of pwm chip Ul.
High bright LED lamp comprises the high bright LED lamp illumination module that is perhaps composed in parallel to the LEDiN series connection by LED1 that is connected between output VOUT+ and the output VOUT-.
Wherein, VIN is the input voltage of this constant-current drive circuit, and it can hang oneself after the electrical network rectification or the voltage of APFC after proofreading and correct, and also can be from the output voltage of AC/DC converter or the voltage of storage battery.VCC is the stabilized voltage power supply of exporting through the 18V that the auxiliary power supply circuit produces, and is responsible for the normal power supply to pwm chip U1, chip for driving U2, integrated transporting discharging U3 chip.Vref signal is the signal by the inner reference voltage 5V that produces of pwm chip U1; 8 pin by pwm chip U1 are exported after the 4th filter capacitor C4 filtering, as 4 pin, the first oscillation resistance Rl of pwm chip U1 and 5 pin the 8th resistance R, the 8 rhythm reference voltages of U3-B.DRV+ and DRV-signal are the high-side driver signals that is produced by chip for driving U2 (IR2181), and DRV+ and DRV-signal are responsible for the driving of the first switch transistor T R1.The U1-1 signal is the control signal of isolating output through the second diode D2 by 7 pin of current loop U3-B, is responsible for the voltage of the l pin of control Ul.VOUT+ and VOUT-are for the output signal, for the bright LED lamp of height provides stable constant-current driving.
Operation principle below in conjunction with a kind of constant-current driving instance explanation circuit of the illumination module that is composed in series by the high bright LED lamp of 25 1W.The specified constant-current driving electric current that the specifications of the high bright LED lamp of 1W provide is 350mA; The scope of the pressure drop of every high bright LED lamp is the 4V of 3.OV～3.; The pressure drop of 25 high bright LED lamps is 75.OV～85.OV so; So we select the supply power voltage of VIN is direct current 100V, the voltage when design output is unloaded is 88V.The resistance value of supposing to get sampling resistor RS1 is l ohm, and on sampling resistor RS1, flowing through the pressure drop that the electric current of 350mA produces so is 350mv, and 1 pin that after the current amplifier ratio is amplified, obtains integrated transporting discharging U3 is the signal of 5.0V.
Selected VIN high input voltage 100V at this instance; So main power inverter of having selected the BUCK topological circuit of voltage-dropping type to form; If having selected VIN is low input, for example 12V or 24V can select the BOOST topological circuit of booster type to form main power inverter at this moment.When the illumination module that is composed in series when the high bright LED lamp of 25 1W is not connected to VOUT+ and VOUT-; Owing to do not have electric current to flow through in the sampling resistor; So VOUT-is OV to the signal on simulation ground; The 1 pin voltage of U3-A also is OV after current amplifier amplifies; To be added to result that the 5 pin voltage 5.OV of 6 pin and the U3-B of U3-B compare be that the 7 pin output of U3-B is saturated to the 1 pin voltage OV signal of U3-A is high level through the tenth resistance R l0, isolates the back to pwm chip U1 control usefulness not through diode D2, and electric current amplified and constant current loop control usefulness not when promptly output was unloaded.This moment, circuit working was in the voltage stabilizing operating state of being made up of voltage feedback circuit and pwm chip U1 internal amplifier; When output voltage is higher than 88V through the 5th resistance R 5, the 4th resistance R 4 minutes voltage signal be added to 2 pin of pwm chip U1; The signal of 2 pin of pwm chip U1 compares at inner with the inner 2.5V reference voltage of pwm chip U1; The pwm signal duty ratio of the 6 pin output of pwm chip U1 is reduced; Through high-side driver chip U2 driving switch pipe TR1, control is delivered to the energy of inductance L l and electric capacity E2, and output voltage is reduced.Otherwise when output voltage is lower than 88V, the pwm signal duty ratio of the 6 pin output of pwm chip U1 is increased, output voltage is raise through voltage feedback circuit.Finally reach the balance of a stable state, promptly realize the function of regulated output voltage.This is in the quick process that inserts and break off of the illumination module that the bright LED lamp of height is composed in series, and output voltage very near the total voltage of high bright LED lamp illumination module, reduces the impact to the bright LED lamp of height, prolongs its useful life.When the illumination module that is composed in series when the high bright LED lamp of 25 1W is connected to VOUT+ and VOUT-output; Because the total voltage of illumination module is lower than the constant voltage output voltage 88V of design; So the voltage of getting at 2 pin of pwm chip U1 through the 5th resistance R 5, the 4th resistance R 4 is lower than inner 2.5V reference voltage; So the output of the internal amplifier of pwm chip U1, i.e. the l pin of Ul output is saturated to be high level.If there is not other signal controlling pwm chip U1 this moment; 6 pin of pwm chip U1 will be exported maximum duty ratio; Drive the first switch transistor T R1 through high-side driver chip U2, make energy constantly be delivered to the first inductance L l and the second electric capacity E2, be applied to the illumination module that high bright LED lamp is composed in series from VIN; The electric current that will cause flowing through high bright LED lamp is uncontrolled considerably beyond rated current, will damage high bright LED lamp.But the electric current that circuit design increases amplification and constant current loop will play the effect of Control current; When output current during, between VOUT-and simulation ground, produce a signal, behind the ratio amplifying circuit that U3-A forms greater than 350mV greater than 350mA; Produce a voltage signal at the l of integrated transporting discharging U3 pin greater than 5.OV; The reference voltage of the 5.OV of 5 pin of this signal and integrated transporting discharging U3 compares, and the 7 pin output voltages of integrated transporting discharging U3 are reduced, and through the second diode D2 l pin voltage of pwm chip U1 is dragged down; The duty ratio of pwm signal of the 6 pin output of pwm chip U1 is reduced; Drive the first switch transistor T R1 through high-side driver chip U2, the energy that control is delivered to the first inductance L l and the second electric capacity E2 reduces, and output current is reduced.Otherwise when output current during less than 350mA, electric current amplifies with the constant current loop controls pwm chip U1; The duty ratio of pwm signal of the 6 pin output of pwm chip U1 is increased; Drive the first switch transistor T R1 through high-side driver chip U2, the energy that control is delivered to the first inductance L l and the second electric capacity E2 increases, and output current is increased; Reach the balance of stable state at last, the average current of output is stable.The current constant that drives high bright LED lamp is constant, realizes the constant-current driving work of high bright LED lamp.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. Switching Power Supply; It is characterized in that; Comprise input module, auxiliary power supply circuit, switching device, pwm chip and drive circuit, filtering output circuit, voltage feedback circuit, current amplification circuit, constant current loop and high bright LED lamp; Wherein, input module, switching device, filtering output circuit and high bright LED lamp are connected successively, and high bright LED lamp, voltage feedback circuit are connected with drive circuit with pwm chip successively; High bright LED lamp, current amplification circuit, constant current loop are connected with drive circuit with pwm chip successively; Input module is connected with the auxiliary power supply circuit, and the auxiliary power supply circuit output end is connected with current amplification circuit with drive circuit, constant current loop with pwm chip respectively, and pwm chip is connected with switching device with drive circuit.
2. a kind of Switching Power Supply according to claim 1; It is characterized in that; The auxiliary power supply circuit further comprises the second triode Q2, the 16 resistance R 16, the first voltage-stabiliser tube Z1 and the 3rd filter capacitor E3; The 16 resistance R 16 is parallel on the second triode Q2 base stage and the collector electrode, and the first voltage-stabiliser tube Z1 is connected between the second triode Q2 base stage and the simulation ground, and the 3rd filter capacitor E3 is parallel between the emitter and simulation ground of the second triode Q2.
3. a kind of Switching Power Supply according to claim 1; It is characterized in that; Switching device and filtering output circuit further comprise the first filter capacitor E1, the first switch transistor T R1, the 14 resistance R the 14, the 15 driving resistor R15, the first diode D1, first inductance L 1, the second filter capacitor E2 and the first sampling resistor RS1; Wherein, the 14 resistance R 14 is connected between 1 pin and 3 pin of the first switch transistor T Rl, and the 15 driving resistor R15 is connected between 1 pin and drive signal DRV+ of the first switch transistor T Rl; The first diode Dl is connected in 3 pin of the first switch transistor T Rl and simulates between the ground; The first inductance L l is connected between 3 pin and output VOUT+ of the first switch transistor T Rl, and the second filter capacitor E2 is connected between output VOUT+ and the simulation ground, and the first sampling resistor RSl is connected between output VOUT-and the simulation ground.
4. a kind of Switching Power Supply according to claim 1; It is characterized in that; Pwm chip and drive circuit further comprise pwm chip U1, chip for driving U2, the first oscillation resistance R1, the first oscillating capacitance C1, the first triode Q1, second resistance R 2, the 3rd resistance R 3, the 3rd filter capacitor C3, the 4th filter capacitor C4, the 7th driving resistor R7, the 5th filter capacitor C5 and high-end current supply circuit; Wherein the first oscillation resistance R1 is connected between 8 pin and 4 pin of pwm chip U1; The first oscillating capacitance C1 is connected between 4 pin and 5 pin of pwm chip U1, and the first triode Q1 is connected between 8 pin and 4 pin of pwm chip U1, and second resistance R 2 is connected between 3 pin of 1 pin and pwm chip U1 of the first triode Q1; The 3rd resistance R 3 is connected between 3 pin and 5 pin of pwm chip Ul; The 3rd filter capacitor C3 is connected between 7 pin and 5 pin of pwm chip U1, and the 4th filter capacitor C4 is connected between 8 pin and 5 pin of pwm chip U1, and the 7th driving resistor R7 is connected between 2 pin of 7 pin and chip for driving U2 of pwm chip U1; The 5th filter capacitor C5 is connected between 1 pin and 4 pin of chip for driving U2; High-end current supply circuit comprises the 3rd diode D3 and the 6th capacitor C 6 on 8 pin that are connected on chip for driving U2, the 7 pin output DRV+ drive signal of chip for driving U2, the 6 pin output DRV-drive signal of chip for driving U2; 5 pin of pwm chip U1 connect simulation ground; 8 pin of pwm chip U1 connect vref signal, and 7 pin of pwm chip U1 connect the VCC signal, and 4 pin of chip for driving U2 connect simulation ground.
5. a kind of Switching Power Supply according to claim 1; It is characterized in that; Current amplification circuit and constant current loop further comprise integrated transporting discharging U3; Be connected in the 13 resistance R 13 between 2 pin of the 11 resistance R 11 between 3 pin and the VOUT-of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and integrated transporting discharging U3 and be connected in 2 pin of integrated transporting discharging U3 and the ratio amplifying circuit that the 12 resistance R 12 between the simulation ground is formed current signals, be connected in the second diode D2 that the 7th capacitor C 7, the 8th capacitor C 8 and the 9th resistance R 9 between the tenth resistance R 10 between the 8th resistance R 8 between 5 pin and the vref signal of integrated transporting discharging U3,1 pin that is connected in integrated transporting discharging U3 and 6 pin, 7 pin that are connected in integrated transporting discharging U3 and 6 pin are formed between constant current loops, 7 pin that are connected in integrated transporting discharging U3 and the U1-1 signal.
6. a kind of Switching Power Supply according to claim 1; It is characterized in that voltage feedback circuit further comprises the 4th resistance R 4 between the 5th resistance R 5 between 2 pin that are connected in VOUT+ and integrated transporting discharging U3,2 pin that are connected in integrated transporting discharging U3 and the simulation ground and the 6th resistance R 6 and second capacitor C 2 that is connected in l pin and 2 pin of pwm chip Ul.
7. a kind of Switching Power Supply according to claim 1 is characterized in that, high bright LED lamp comprises and is connected in output VOUT+ and the output high bright LED lamp illumination module that is perhaps composed in parallel to the LEDiN series connection by LED1 between the VOUT-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101713638A CN102843812A (en) | 2011-06-24 | 2011-06-24 | Switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101713638A CN102843812A (en) | 2011-06-24 | 2011-06-24 | Switch power supply |
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| CN102843812A true CN102843812A (en) | 2012-12-26 |
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| CN2011101713638A Pending CN102843812A (en) | 2011-06-24 | 2011-06-24 | Switch power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103561527A (en) * | 2013-11-19 | 2014-02-05 | 神龙汽车有限公司 | Dual-function LED drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020097004A1 (en) * | 2001-01-19 | 2002-07-25 | Yi-Chao Chiang | Power supply system for multiple loads and driving system for multiple lamps |
| CN201252662Y (en) * | 2008-05-09 | 2009-06-03 | 深圳市东辰科技有限公司 | Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip |
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2011
- 2011-06-24 CN CN2011101713638A patent/CN102843812A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020097004A1 (en) * | 2001-01-19 | 2002-07-25 | Yi-Chao Chiang | Power supply system for multiple loads and driving system for multiple lamps |
| CN201252662Y (en) * | 2008-05-09 | 2009-06-03 | 深圳市东辰科技有限公司 | Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103561527A (en) * | 2013-11-19 | 2014-02-05 | 神龙汽车有限公司 | Dual-function LED drive circuit |
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Application publication date: 20121226 |