CN201774717U - SCR resonance half-bridge based LED streetlamp drive power circuit - Google Patents
SCR resonance half-bridge based LED streetlamp drive power circuit Download PDFInfo
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- CN201774717U CN201774717U CN2010205063466U CN201020506346U CN201774717U CN 201774717 U CN201774717 U CN 201774717U CN 2010205063466 U CN2010205063466 U CN 2010205063466U CN 201020506346 U CN201020506346 U CN 201020506346U CN 201774717 U CN201774717 U CN 201774717U
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses an SCR resonance half-bridge LED streetlamp drive power circuit, which includes a lightning protection circuit and an EMI filter, a power factor correcting circuit, an SCR resonance half-bridge circuit, a synchronous rectification circuit, an output filter circuit, a protection circuit, an SCR resonance controller, a starting circuit, an DC input filter circuit, a constant current drive circuit and a microprocessor. The utility model can realize the simple and cost-benefit circuit design, provide conveniences for modularization and standardization, complete the protection function, and have the characteristics of fewer elements and simple and reliable circuit realization.
Description
Technical field
The utility model belongs to LED illumination application technology, relates to the LED drive characteristic, and drives the great power LED control technology with civil power.
Background technology
Great power LED is energy-conservation, efficient with it, environmental protection, life-span are long etc. has numerous advantages that it is more and more favored in general illumination market, progressively substituting traditional lighting source, and then become lighting source of new generation, in power-saving technology cry surging today, the main flow that the LED lighting technology becomes lighting technology has become common recognition.The bulk life time of LED ligthing paraphernalia and luminous efficiency must be integrated from photoelectricity and take in, so the LED driving power plays crucial effects to the embodiment of LED efficient energy-saving performance, high efficiency, High Power Factor, high reliability, long-life are requirement and the challenges that driving power faces, and power has been widely used in street lighting and the high-power area illumination at 90W～300W AC-DC LED.At LED road lamp power supply development trend, a kind ofly can take into account high-frequency, high efficiency topology is the key that addresses these problems.
The utility model content
The technical problems to be solved in the utility model has been to provide a kind of reliable and practical SRC resonance oscillation semi-bridge LED streetlamp driving power supply circuit, and this circuit design is the control core with CM6900G, working stability, reliable.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge, adopt split-type structural, comprise prime AC-DC converter and the back grade of buck DC-DC converter of deciding electric current output, comprise lightning protection circuit and electromagnetic interface filter, circuit of power factor correction, the SCR resonance half-bridge circuit, circuit of synchronous rectification, output filter circuit, control circuit, the SCR resonant controller, start-up circuit, the DC input filter circuit, constant-current drive circuit, microprocessor, described lightning protection circuit and electromagnetic interface filter connect start-up circuit and circuit of power factor correction, start-up circuit connects circuit of power factor correction again, described circuit of power factor correction is connected with the SCR resonant controller with the SCR resonance half-bridge circuit respectively, the SCR resonant controller connects SCR resonance half-bridge circuit and circuit of synchronous rectification simultaneously, circuit of synchronous rectification connects output filter circuit successively afterwards, control circuit and SCR resonant controller, wherein be connected with the DC input filter circuit by external electric power connection line, realize that prime AC-DC converter and back level decide being connected of buck DC-DC converter that electric current exports, the input of constant-current drive circuit respectively with the DC input filter circuit, microprocessor connects.
Described lightning protection circuit and electromagnetic interface filter are made up of Thermal Cutoffs, piezo-resistance, ceramic gas discharge tube; The L line of Thermal Cutoffs one termination input high pressure AC; the other end and an end that connects ceramic gas discharge tube after piezo-resistance is connected; another termination protection ground of ceramic gas discharge tube; the N line of Thermal Cutoffs one termination input high pressure AC; link to each other with the node of ceramic gas discharge tube and piezo-resistance again after the series connection of the other end and piezo-resistance; piezo-resistance be connected between L line and the N line after Thermal Cutoffs is connected, its two-stage electromagnetic interface filter is made up of differential mode inductance, resistance, X2 type electric capacity, common mode inductance, X2 type electric capacity, Y1 type electric capacity, discharge resistance respectively.
Described circuit of power factor correction is by absorption circuit, the field effect transistor of integrated circuit, transformer, diode, and the Drive Protecting Circuit of field effect transistor, voltage stabilizing didoe, resistance are formed; Wherein the absorption circuit of diode is made of resistance, electric capacity, and the Drive Protecting Circuit of field effect transistor is made of diode, resistance; The equal ground connection of the 1st pin of the source electrode of field effect transistor and integrated circuit, an end ground connection after the resistance parallel connection, the cathode output end of another termination bridge heap, the 3rd pin of the current detecting end of receiving by resistance again; The minus earth of voltage stabilizing didoe, positive pole connect the 3rd pin of integrated circuit, and transformer is established three windings, and these three windings constitute the power supply winding of the resonance control chip of the power supply winding of integrated circuit of boost inductance winding, primary side and secondary side respectively; The boost inductance winding is as the cathode output end of boost inductance one termination bridge heap, the node of the anodal field effect transistor drain electrode of its other end and diode is connected, and two other winding connects the integrated circuit that rectification circuit is a primary side and the resonance control chip power supply of secondary side respectively.
Described SCR resonance half-bridge circuit is that the transformer of centre cap formula is formed by field effect transistor, resonant capacitance and resonant inductance, secondary side, the source electrode of field effect transistor and field effect transistor drain junction and resonant capacitance, resonant inductance, secondary side are to receive the field effect transistor source electrode, the field effect transistor source ground after the primary coil of elementary winding of the transformer of centre cap formula is connected.
Described circuit of synchronous rectification is made up of field effect transistor; The number of turn of the coiling of two windings of secondary side output of transformer is identical, winding different name end links to each other with the end of the same name of winding, the other two ends of winding connect the drain electrode of two field effect transistor respectively, the source electrode of two field effect transistor links to each other, and the signal of field effect transistor is connected with the IC output signal circuit.
Described protective circuit is made up of primary side control circuit and secondary side control circuit, and wherein, primary side control circuit is made of transformer, diode, electric capacity, resistance; The secondary side control circuit is made of operational amplifier, resistance, diode, electric capacity.
Described constant-current drive circuit is made up of integrated circuit, field effect, electric capacity, diode, resistance, inductance; The positive pole of diode connects the positive pole of electric capacity, and the diode series resistance is to the 1st pin of integrated circuit, and resistance string is associated between current detecting end the 4th pin and integrated circuit the 5th pin of integrated circuit, and the 8th pin of integrated circuit connects photoelectrical coupler.
Outstanding advantage of the present utility model is: 1, good lightning protection circuit design prevents the destruction of lightning induced voltage to illuminator; 2, pfc circuit design effectively limits harmonic current and improves power factor; 3, SCR resonance half-bridge circuit design realizes the soft switch control of ZVS, and double protection functions is raised the efficiency; 4, adopt circuit of synchronous rectification, reduce the rectification circuit loss, raise the efficiency; 5, high efficiency constant-current drive circuit design, energy saver mode control, the illumination advantage of embodiment LED.
Figure of description
Fig. 1 is a prime AC-DC part control flow chart of the present utility model;
Fig. 2 is a back of the present utility model level DC-DC part control flow chart;
Fig. 3 is the utility model lightning protection circuit and EMI filter circuit figure;
Fig. 4 is the utility model circuit of power factor correction schematic diagram;
Fig. 5 is the utility model circuit of synchronous rectification schematic diagram;
Fig. 6 is the utility model DC input filter circuit schematic diagram;
Fig. 7 is the utility model microcontroller circuit schematic diagram.
Embodiment
With reference to Fig. 1 and Fig. 2; present embodiment comprises lightning protection circuit and electromagnetic interface filter 1, circuit of power factor correction 2, SCR resonance half-bridge circuit 3; circuit of synchronous rectification 4; output filter circuit 5, protective circuit 6, SCR resonant controller 7; start-up circuit 8; DC input filter circuit 9, constant-current drive circuit 10, microprocessor 11.Wherein, described lightning protection circuit and electromagnetic interface filter 1; circuit of power factor correction 2; SCR resonance half-bridge circuit 3; circuit of synchronous rectification 4; output filter circuit 5; protective circuit 6; connect successively; the input of described start-up circuit 8 is connected with lightning protection circuit and electromagnetic interface filter 1; the output of start-up circuit 8 links to each other with circuit of power factor correction 2; SCR resonant controller 7 inputs are connected with protective circuit 6 with circuit of power factor correction 2 respectively, SCR resonant controller 7 outputs and SCR resonance half-bridge circuit 3, and circuit of synchronous rectification 4 links to each other respectively; output filter circuit 5 is connected with DC input filter circuit 9 by external electric power connection line, realize prime AC-DC converter with after grade decide being connected of buck DC-DC converter that electric current exports.The input of constant-current drive circuit 10 respectively with DC input filter circuit 9, microprocessor 11 connects.
That shown in Figure 3 is lightning protection circuit and 1 one kinds of embodiment of electromagnetic interface filter, it is by Thermal Cutoffs FT1, FT2, FT3, piezo-resistance VT1, VT2, VT3, ceramic gas discharge tube, ZD5 form the composite symmetrical lightning protection circuit and the two-stage electromagnetic interface filter connects to form; Composite symmetrical type protective circuit; realize differential mode, common mode full guard; the L line of FT2 one termination input high pressure AC; the other end and an end that meets ZD5 after VT3 connects; another termination protection ground (PE) of ZD5; link to each other with the node of VT3 with ZD5 again behind the N line of FT3 one termination input high pressure AC, the other end and VT2 series connection, VT1 be connected between L line and the N line after FT1 connects.Thermal Cutoffs can break away from piezo-resistance after the piezo-resistance short circuit is lost efficacy from circuit, avoid the circuit breaking out of fire.Lightning protection circuit can discharge to the lightning induction high electric field pulse, avoids the equipment damage that is broken down by high-voltage; Its two-stage electromagnetic interface filter is respectively by differential mode inductance L3, resistance R 59, X2 type capacitor C X1 forms the first order electromagnetic interface filter in order to filtering high-frequency current ripple, and common mode inductance L4, X2 type capacitor C X1, CX2, Y1 type capacitor C Y3, CY4, CY5, negative tempperature coefficient thermistor RT1, discharge resistance R30, R31, R42, R43 form and are used to suppress radio frequency interference second level electromagnetic interface filter formation.After EMI filtering, a lot of high frequency clutters were filtered out during electrical network exchanged, and then carried out rectifying and wave-filtering, sinusoidal ac were become the direct current of pulsation.
Figure 4 shows that a kind of embodiment of circuit of power factor correction 2: it comprises integrated circuit (IC) 1, transformer T1, diode D2, D13; the absorption circuit of D2, field effect transistor Q5, the Drive Protecting Circuit of field effect transistor Q5; voltage stabilizing didoe ZD2, formations such as resistance R J1, RJ2.The absorption circuit of D2 is made of resistance R 6, R8, C1, the Drive Protecting Circuit of Q5 is made of D5, R18, R19, the 1st pin ground connection of the source ground of Q5 and IC1, an end ground connection after RJ1, the RJ2 parallel connection, the cathode output end of another termination bridge heap DB1, the 3rd pin of the current detecting end IC1 that receives by R20 again; The minus earth of voltage stabilizing didoe ZD2, positive pole connect the 3rd pin of IC1, and the ZD2 effect is to avoid big voltge surge to dash to damage IC1.The positive and negative electrode output termination capacitor filtering C4 of bridge heap DB1, transformer T1 establishes three windings, and these three windings constitute the power supply winding T1-C of the resonance control chip IC3 of the power supply winding T1-B of IC1 of boost inductance winding T1-A, primary side and secondary side respectively.The cathode output end of T1-A winding one termination bridge heap, its other end is connected with the node of the anodal Q6 drain electrode of D5, two other winding T1-B and T1-C constitute the auxiliary power supply winding of primary side and secondary side respectively, connect the resonance control chip IC3 power supply of IC1 that rectification circuit is a primary side and secondary side respectively.IC1 adopts the second generation CCM of Infineon pfc controller ICE2PCS02, and its chip adopts the Bi-CMOS technology, need not multiplier, and using seldom, peripheral cell can satisfy whole requirements that PFC uses.Pfc circuit produces pwm signal according to the variation of voltage, electric current and the load of electrical network, and the inductive current waveform is regulated in the conducting of control electronic switch, and making the electrical network input current is sinusoidal wave substantially, makes power factor near 1.
Figure 4 shows that a kind of embodiment of SCR resonance half-bridge circuit 3, it comprises switching network, resonant network, transformer.Wherein switching network comprises two field effect transistor Q3, Q4, and resonant network comprises the magnetizing inductance of resonant capacitance C3 and resonant inductance L1, T2.Transformer is that secondary side is the transformer T2 of centre cap formula.The drain electrode of Q3 connects the 400V voltage of pfc circuit output, the source electrode of Q3 and Q4 drain junction with receive the Q4 source electrode, the Q4 source ground after the primary coil T4A of elementary winding I, the T4 of C3, L1, T2 connects.Transformer primary side switch control control mode adopts complementary symmetrical pulse signal, and when Q3, the mutual conducting of Q4, energy is delivered to secondary side by the primary side of transformer, and wherein zero voltage switching mechanism is then finished at Dead Time.With use two capacitive semi-bridge convertor differences, for playing the part of, C3 deadens electric capacity and resonant capacitance dual role here, and resonant inductance L1 places transformer T2 outside, has both improved the flexibility of design, can effectively reduce the EMI width of cloth again and penetrate.The transformer of employing standard substitutes groove transformer, and the design of transformer ratio is easier to.
In the present embodiment, start-up circuit 8 is by triode Q1, Q2, voltage stabilizing didoe ZD1, ZD3, diode D1, resistance R 1-R5, R7 forms, and is powered by the auxiliary power supply winding behind the power initiation, operation principle is as follows, resistance R 2, the cathode output end of R3 series connection back one termination rectifier bridge heap DB1, the collector electrode of another termination Q1, resistance R 1, the cathode output end of R4 series connection back one termination rectifier bridge heap DB1, the base stage of another termination Q1, the plus earth of ZD1, negative pole meet the base stage of Q1, Q2, R5, ZD3 forms serial regulating circuit, the voltage stabilizing value of ZD3 is greater than ZD1, the principle of circuit is after inserting civil power, triode Q1 conducting, and input voltage passes through R2, R3 charges to electric capacity EC3, when the EC1 both end voltage is charged in 11.8V, integrated circuit (IC) 1 starts, and the work of auxiliary power supply winding is because the voltage stabilizing value of ZD3 is greater than ZD1, the EC3 both end voltage can progressively raise, make the emitter current potential of triode Q1 be higher than base potential, Q1 stops electric current output automatically, reduces circuit loss.
Figure 5 shows that a kind of embodiment of circuit of synchronous rectification 4, it is by field effect transistor Q6, Q7, R55, R56, the secondary side output winding of transformer T2 constitutes, the secondary side output winding II of transformer T2, the number of turn of the coiling of III is identical, winding II different name end its tie point that links to each other with the end of the same name of winding III is called the secondary side centre cap of T2, the drain electrode of the termination Q6 of the same name of winding II, the drain electrode of the different name termination Q7 of winding III, Q6, the source electrode of Q7 links to each other, Q6, the signal of Q7 is connected with integrated circuit (IC) 3 (CM6900G) output signal circuit, IC3 can simulating diode the conducting sequential, the field effect transistor of collocation SR Mosfet low on-resistance substitutes traditional rectifier diode, in order to reduce the loss of rectification circuit.
In the present embodiment, described output filter circuit 5 is made of the pi type filter that inductance L 2, electric capacity EC7, EC8, EC11 form.The secondary side centre cap winding (node of the end of the same name of II different name end and winding III) of the termination transformer T2 of L2, the positive pole of EC7, EC8, the positive pole of another termination EC11 of L2, the negative pole of EC7, EC8 links to each other with the source electrode of Q6, Q7.The two ends of current sense resistor R29 connect the negative pole of EC7 and the negative pole of EC11 respectively.
In the present embodiment, described protective circuit 6 primary side control circuits are by transformer T4, diode D15-D19; capacitor C 19, EC9 resistance R 57, R58 constitute; the secondary side control circuit is by operational amplifier IC2, resistance R 23, R29, R40, R41, diode D6, and capacitor C 12, C13 constitute.Wherein, the primary side control method: the end elementary of the same name of transformer T4 links to each other with the different name end of transformer T2 primary coil, and the elementary different name end of T4 links to each other with the source electrode of Q4.T4 secondary connects in the bridge rectifier that D15-D18 forms; the current signal of transformer T4 induction amplifies; rectification; again by electric capacity EC9 filtering; voltage is through R57 after the filtering; the voltage divider of R58 is received the D19 positive pole; the negative pole of D19 links to each other with the negative pole of the output D6 of secondary side protective circuit; secondary side control method: the 3 pin connecting resistance R41 of operational amplifier IC2; the negative pole of another termination EC9 of R41; flow through the electric current of R29 by operational amplifier IC2; R23; C12 amplifies in proportion; signal after the amplification is by the 1 pin output of IC2; the positive pole of diode D6 links to each other with 1 pin of IC2; its negative pole links to each other with the end of D19 negative pole and R48; the 8th pin of another termination IC3 of R48; when the voltage of the 8th pin of IC3 reaches 1V; IC3 cut-off signals output immediately realizes the former secondary duplicate protection of transformer, has improved the stability and the reliability of circuit.
In the present embodiment, described SCR resonant controller 7 is integrated circuit (IC) 3 (CM6900G), adopts the FM+PWM control method to solve the problem of series resonant circuit load voltage regulation performance difference.Built-in synchronous rectifier driver has solved resonant power and has been not easy to realize synchronous rectification and circuit complicated problems.
Figure 6 shows that a kind of embodiment of DC input filter circuit 9, it is made of electric capacity ECA1 and Transient Suppression Diode ZD4.The ZD4 negative pole is connected with the positive pole of ECA1, the positive pole of input dc power, and ZD4 is anodal to be connected with the negative pole of ECA1, the negative pole of input dc power.The ZD1 effect is the input overvoltage protection, prevents to import the high pressure spike circuit is damaged.
In the present embodiment, described constant-current drive circuit 10 is by ICA1 (MBI6901), and electric capacity ECA1, ECA2, ECA3, CA1, CA2, CA3, CA5 reach resistance R A1-RA3, RA5, RA6, diode DA1, DA2, DA3, and inductance L A1, field effect transistor QA1 constitutes.RA3 is a current sense resistor, and RA3 is connected between current detecting end the 4th pin and ICA1 the 5th pin of ICA1.The positive pole of diode DA3 connects the positive pole of electric capacity ECA1; diode DA3 series resistance RA1 is to the 1st pin of ICA1; input direct voltage by DA3 and RA1 to starting electric capacity ECA3; the CA2 charging; when the electric capacity both end voltage is raised to IC1 starting resistor 17V; constant-current circuit starts; DA3 and RA1 form the startup protective circuit; start the repid discharge of electric capacity in the time of can avoiding importing outage; RA5 is a discharge resistance; RA5 is parallel to the ECA2 two ends; when the input power remove, provide discharge path for output filter capacitor ECA2; can satisfy like this under the continuous high-speed switch state of input voltage and can normally start; decoupling capacitor CA5 is parallel to the RA3 two ends, is the interference signal on road in order to the filtering current detecting, promotes constant current accuracy.The 8th pin of ICA1 connects the pwm signal that optocoupler passes over, the ON time of control field effect transistor QA1, and the size of adjustment LED output current is controlled as energy saver mode.
Figure 7 shows that a kind of embodiment of microprocessor 11, it is a single-chip microcomputer, the timing output pwm signal, pwm signal is from the 8th output of IC4, receive the 13rd pin of inverter ic 5, an end that is connected to photoelectrical coupler IC6 is exported from the 12nd pin of IC5 in the anti-phase back of pwm signal, pwm signal is delivered to the 8th pin of ICA1 by optocoupler, adjust output current, reach the effect of light modulation.
Claims (7)
1. LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge, adopt split-type structural, comprise prime AC-DC converter and the back grade of buck DC-DC converter of deciding electric current output, it is characterized in that: comprise lightning protection circuit and electromagnetic interface filter (1), circuit of power factor correction (2), SCR resonance half-bridge circuit (3), circuit of synchronous rectification (4), output filter circuit (5), control circuit (6), SCR resonant controller (7), start-up circuit (8), DC input filter circuit (9), constant-current drive circuit (10), microprocessor (11), described lightning protection circuit and electromagnetic interface filter (1) connect start-up circuit (8) and circuit of power factor correction (2), start-up circuit (8) connects circuit of power factor correction (2) again, described circuit of power factor correction (2) is connected with SCR resonant controller (7) with SCR resonance half-bridge circuit (3) respectively, SCR resonant controller (7) connects SCR resonance half-bridge circuit (3) and circuit of synchronous rectification (4) simultaneously, circuit of synchronous rectification (4) connects output filter circuit (5) successively afterwards, control circuit (6) and SCR resonant controller (7), wherein be connected with DC input filter circuit (9) by external electric power connection line, realize that prime AC-DC converter and back level decide being connected of buck DC-DC converter that electric current exports, the input of constant-current drive circuit (10) respectively with DC input filter circuit (9), microprocessor (11) connects.
2. the LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge according to claim 1 is characterized in that: described lightning protection circuit and electromagnetic interface filter (1) are made up of Thermal Cutoffs (FT1, FT2, FT3), piezo-resistance (VT1, VT2, VT3), ceramic gas discharge tube (ZD5); The L line of Thermal Cutoffs (FT2) termination input high pressure AC; the other end and an end that connects ceramic gas discharge tube (ZD5) after piezo-resistance (VT3) is connected; another termination protection ground (PE) of ceramic gas discharge tube (ZD5); the N line of Thermal Cutoffs (FT3) termination input high pressure AC; link to each other with the node of ceramic gas discharge tube (ZD5) again after the series connection of the other end and piezo-resistance (VT2) with piezo-resistance (VT3); piezo-resistance (VT1) be connected between L line and the N line after Thermal Cutoffs (FT1) is connected, its two-stage electromagnetic interface filter is respectively by differential mode inductance (L3); resistance (R59); X2 type electric capacity (CX1); common mode inductance (L4); X2 type electric capacity (CX1; CX2); Y1 type electric capacity (CY3; CY4; CY5); thermistor (RT1); discharge resistance (R30; R31; R42; R43) form.
3. the LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge according to claim 1, it is characterized in that: described circuit of power factor correction (2) is by integrated circuit (IC1), transformer (T1), diode (D2, D13), the absorption circuit of diode (D2), field effect transistor (Q5), and the Drive Protecting Circuit of field effect transistor (Q5), voltage stabilizing didoe (ZD2), resistance (RJ1, RJ2) are formed; Wherein the absorption circuit of diode (D2) is made of resistance (R6, R8, C1), and the Drive Protecting Circuit of field effect transistor (Q5) is made of diode (D5), resistance (R18, R19); The equal ground connection of the 1st pin of the source electrode of field effect transistor (Q5) and integrated circuit (IC1), resistance (RJ1, RJ2) back in parallel one end ground connection, the cathode output end of another termination bridge heap (DB1), the 3rd pin of the current detecting end of receiving by resistance (R20) (IC1) again; The minus earth of voltage stabilizing didoe (ZD2), positive pole connects the 3rd pin of integrated circuit (IC1), transformer (T1) is established three windings, and these three windings constitute the power supply winding (T1-C) of the resonance control chip (IC3) of the power supply winding (T1-B) of integrated circuit (IC1) of boost inductance winding (T1-A), primary side and secondary side respectively; Boost inductance winding (T1-A) winding is as the cathode output end of boost inductance one termination bridge heap, its other end is connected with the node of anodal field effect transistor (Q5) drain electrode of diode (D2), and two other winding (T1-B) and winding (T1-C) connect resonance control chip (IC3) power supply of integrated circuit that rectification circuit is a primary side (IC1) and secondary side respectively.
4. the LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge according to claim 1, it is characterized in that: described SCR resonance half-bridge circuit (3) is by field effect transistor (Q3, Q4), resonant capacitance (C3) and resonant inductance (L1), secondary side is that the transformer (T2) of centre cap formula is formed, the source electrode of field effect transistor (Q3) and field effect transistor (Q4) drain junction and resonant capacitance (C3), resonant inductance (L1), secondary side is the elementary winding (I) of the transformer (T2) of centre cap formula, receive field effect transistor (Q4) source electrode, field effect transistor (Q4) source ground after primary coil (T4A) series connection of transformer (T4).
5. the LED streetlamp driving power supply circuit based on the SRC resonance oscillation semi-bridge according to claim 1 is characterized in that: described circuit of synchronous rectification (4) is made up of field effect transistor (Q6, Q7, R55, R56); The number of turn of the coiling of the secondary side output winding (II, III) of transformer (T2) is identical, winding (II) different name end links to each other with the end of the same name of winding (III), the drain electrode of the termination field effect transistor of the same name (Q6) of winding (II), the drain electrode of the different name termination field effect transistor (Q7) of winding (III), the source electrode of effect pipe (Q6, Q7) links to each other, and the signal of field effect transistor (Q6, Q7) is connected with integrated circuit (IC3) output signal circuit.
6. according to claim 1 based on all the shake LED streetlamp driving power supply circuit of half-bridge of SRC; it is characterized in that: described protective circuit (6) is made up of primary side control circuit and secondary side control circuit; wherein, primary side control circuit is made of operational amplifier (IC2), resistance (R23, R29, R40, R41), diode (D6), electric capacity (C12, C13) transformer (T4), diode (D15-D19), electric capacity (C19, EC9), resistance (R57, R58), secondary side control circuit.
7. according to claim 1 based on all the shake LED streetlamp driving power supply circuit of half-bridge of SRC, it is characterized in that: described constant-current drive circuit (10) is made up of integrated circuit (ICA1), field effect (QA1), electric capacity (ECA1, ECA2, ECA3, CA1, CA2, CA3, CA5), diode (DA1, DA2, DA3), resistance (RA1-RA3, RA5, RA6), inductance (LA1); The positive pole of diode (DA3) connects the positive pole of electric capacity (ECA1), diode (DA3) negative pole series resistance (RA1) is to the 1st pin of integrated circuit (ICA1), resistance (RA3) is connected between current detecting end the 4th pin and integrated circuit (ICA1) the 5th pin of integrated circuit (ICA1), resistance (RA5) is parallel to electric capacity (ECA2) two ends, resistance (RA5) is parallel to resistance (RA3) two ends, and the 8th pin of integrated circuit (ICA1) connects photoelectrical coupler.
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| CN2010205063466U CN201774717U (en) | 2010-08-26 | 2010-08-26 | SCR resonance half-bridge based LED streetlamp drive power circuit |
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| CN2010205063466U CN201774717U (en) | 2010-08-26 | 2010-08-26 | SCR resonance half-bridge based LED streetlamp drive power circuit |
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| CN106991978B (en) * | 2017-05-16 | 2020-04-10 | 深圳市华星光电技术有限公司 | Backlight drive control circuit based on LLC |
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