CN209824097U - LCC resonance dimming control circuit - Google Patents
LCC resonance dimming control circuit Download PDFInfo
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- CN209824097U CN209824097U CN201821898297.8U CN201821898297U CN209824097U CN 209824097 U CN209824097 U CN 209824097U CN 201821898297 U CN201821898297 U CN 201821898297U CN 209824097 U CN209824097 U CN 209824097U
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Abstract
The utility model provides a LCC resonance dimming control circuit, which comprises a preceding stage rectification filter circuit, a LCC half-bridge resonant cavity circuit, an IC control circuit, a secondary stage rectification filter circuit, a dial switch control circuit and a dimming circuit; the output end of the preceding stage rectification filter circuit is connected with the input end of the LCC half-bridge resonant cavity circuit; the LCC half-bridge resonant cavity circuit is respectively connected with the IC control circuit and the secondary rectifying and filtering circuit; the IC control circuit is connected with the input end of the dial switch control circuit; the IC control circuit is connected with the dimming circuit. The utility model provides a LCC resonance dimming control circuit to solve current LLC resonant circuit and can not do the technical problem who adjusts luminance, can be under the basis that accords with north american latest law simultaneously, accurately and carry out dimming control steadily.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a LCC resonance dimming control circuit.
Background
The current dimming line is converted by a dimming IC or MCU on the secondary side, and is matched with an optical coupler to carry out signal isolation transmission, so that the dimming function is achieved. However, the optical coupler has a large transmission delay on signals, which affects the transmission accuracy of signals, and the electrical-optical-electrical transmission of the optical coupler is easily affected by temperature, and the higher the temperature is, the worse the CTR of the optical coupler is.
In the prior art, a common power resonant circuit is mainly configured by LLC resonance, and the LLC resonant circuit includes: the power converter has the advantages of high PF value, low harmonic wave, no stroboflash, high efficiency, low cost, no reverse recovery problem, small switching loss and suitability for high-frequency and high-power density design, and the primary side MOSFET and the triode ZVS of the converter are switched on, and the output diode ZCS is switched off. However, the current LLC resonant circuit cannot be dimmed because the architecture limits the LLC resonant circuit to not make wide load variations.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an LCC resonance dimming control circuit to solve current LLC resonant circuit and can not do the technical problem who adjusts luminance, can be under the basis that accords with north american latest law simultaneously, accurately and steadily adjust luminance the control.
In order to solve the above problem, an embodiment of the present invention provides an LCC resonant dimming circuit, which includes a preceding stage rectification filter circuit, an LCC half-bridge resonant cavity, an IC control circuit, a secondary rectification filter circuit, a dial switch control circuit, and a dimming circuit;
the output end of the preceding stage rectification filter circuit is connected with the input end of the LCC half-bridge resonant cavity circuit;
the LCC half-bridge resonant cavity circuit is respectively connected with the IC control circuit and the secondary rectifying and filtering circuit;
the IC control circuit is connected with the input end of the dial switch control circuit;
the dimming circuit is connected with the IC control circuit.
Further, the preceding stage rectification filter circuit comprises a first input end of alternating current, a second input end of the alternating current and a rectifier bridge;
the first input end of the alternating current is connected with a fuse F1, a thermistor NTC, a voltage dependent resistor VR1, a capacitor C1, a resistor R2, an inductor L1, a capacitor C2 and the first input end of a rectifier bridge; the second input end of the alternating current is connected with the thermistor VR1, the capacitor C1, the resistor R1, the inductor L1, the inductor L2, the capacitor C2 and the second input end of the rectifier bridge;
the resistor R1 is connected with the resistor R2 in series; the inductor L2 is connected with the resistor R3 in parallel; and the output end of the rectifier bridge is connected with the input end of the LCC half-bridge resonant cavity circuit.
Further, the LCC half-bridge resonant cavity circuit comprises a rectifier bridge, an inductor L4B, a capacitor C4 and a capacitor C19;
the first input end of the rectifier bridge is connected with a capacitor C17; the second input end of the rectifier bridge is connected with a capacitor C4; the capacitor C4 is connected with the capacitor C3 and the diode D5 in parallel respectively, and the diode D5 is connected with the capacitor C5, the resistor R5, the emitter of the triode Q2 of the capacitor C7, the diode D7 and the capacitor C8;
a second output end of the rectifier bridge is connected with a capacitor C5, a collector of a triode Q1 and a diode D6, a base of the triode Q1 is connected with a transformer T1 through a capacitor C6 and a resistor 4, and an emitter of the triode Q1 is connected with the collector of the triode Q2;
a node between the diode D6 and the diode D7 is connected with the capacitor D8, the inductor L4B, the first input end of the transformer T2 and the capacitor C19;
the second input end of the transformer T2 is respectively connected in parallel with the resistor R10, the resistor R11, the resistor R22 and the resistor R23.
Further, the secondary rectifying and filtering circuit comprises a transformer T2, a diode D10, a diode D11, a capacitor C18 and a resistor R24;
the first end of the secondary rectifying and filtering circuit is respectively connected with a resistor R24, a capacitor C18, a diode D10 and a capacitor C19, and the capacitor C19 is connected with a transformer T2 in series;
the capacitor C19 is connected with a diode D11, and a diode D11 is connected with a transformer T2 in series;
and the second output end of the secondary rectifying and filtering circuit is connected with the transformer in common.
Further, the dial switch control circuit comprises a resistor R17, a resistor R18, a resistor R36 and a resistor R37;
the CS pin of the IC control circuit is connected with the ground input end of the dial switch control circuit and the switch SW1, the first output end of the switch SW1 is respectively connected with the resistor R17 and the resistor R18 in parallel, the second output end of the switch SW1 is respectively connected with the resistor R36 and the resistor R37 in parallel, and the resistor R17 is connected with the resistor R18, the resistor R36 and the resistor R37 in parallel and is grounded.
Further, the dimming circuit comprises a capacitor C23, a resistor R31, an inductor L5, a rectifier diode D12 and a zener diode ZD 1;
the input end of the dimming circuit is connected with a capacitor C23, a resistor R31 and an inductor L5, and the inductor L5 is connected with a diode D9, a diode D15, a diode D16, a resistor R26 and a DIM pin of the IC control circuit;
the resistor R26 is respectively connected with the resistor R33 and the capacitor C22 in parallel;
the inductor L5 is connected with the rectifier diode D12, the voltage stabilizing diode ZD1, the capacitor C27 and the resistor R29; the diode D12 is connected in parallel to the zener diode ZD1 and the capacitor C27, respectively, and the capacitor C27 is connected to the ground.
The embodiment of the utility model provides an LCC resonance dimming control circuit to solve current LLC resonant circuit and can not do the technical problem who adjusts luminance, can be under the basis that accords with north american latest law simultaneously, accurately and steadily adjust luminance the control.
Drawings
Fig. 1 is a schematic diagram of an LCC resonant dimming control circuit provided by the present invention;
fig. 2 is a functional block diagram of an LCC resonant dimming control circuit provided by the present invention;
fig. 3 is a circuit diagram of the pre-shift stage rectifying and filtering circuit provided by the present invention;
fig. 4 is a circuit diagram of an LCC half-bridge resonant cavity provided by the present invention;
fig. 5 is a circuit diagram of the IC control circuit provided by the present invention;
fig. 6 is a circuit diagram of a secondary rectifying and filtering circuit provided by the present invention;
fig. 7 is a circuit diagram of a dial switch control circuit provided by the present invention;
fig. 8 is a circuit diagram of the present invention.
Wherein the drawings in the drawings accompanying the specification are numbered as follows:
101. a preceding stage rectification filter circuit; 102. an LCC half-bridge resonant cavity circuit; 103. an IC control circuit; 104. a secondary rectifying filter circuit; 105. a dial switch control circuit; 106. a dimming circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-8, an embodiment of the present invention provides an LCC resonant dimming circuit 106, including a pre-stage rectification filter circuit 101, an LCC half-bridge resonant cavity circuit 102, an IC control circuit 103, a secondary rectification filter circuit 104, a dial switch control circuit 105, and a dimming circuit 106;
the output end of the preceding stage rectification filter circuit 101 is connected with the input end of the LCC half-bridge resonant cavity circuit 102;
the LCC half-bridge resonant cavity circuit 102 is respectively connected with the IC control circuit 103 and the secondary rectifying and filtering circuit 104;
the IC control circuit 103 is connected with the input end of the dial switch control circuit 105;
the IC control circuit 103 is connected to the dimming circuit 106.
In the embodiment of the present invention, it can be understood that the operating principle of the LCC resonant dimming circuit 106 is: at the time of T0-T1, when the HV voltage is established, the transformer T1 drives the triode Q1 to turn on and charge the NP of the transformer T2 through the inductor L4, and the C4 stores energy, at this time, the NP of the transformer T2 is coupled with the NS, the NP voltage is clamped by the NS, the clamping voltage is N × NS voltage, and at the same time, the resonant capacitor C19 is charged and then supplied to the output terminal, and when the CS pin of the control chip U1 detects that the threshold voltage is reached, the transformer T1 is controlled to turn off the Q1; at the time of T1-T2, when the transistor Q1 is completely turned off, the transistor Q2 is driven to be turned on, at this time, the resonant capacitor C19 reversely charges the transformer T2, the inductor L4 charges the transformer T2, the primary NP of the transformer T2 is demagnetized and induces a reverse voltage, the NP of the transformer T2 is coupled with the NS, the NP voltage is clamped by the NS, the clamping voltage is N × NS voltage, the resonant capacitor C19 is charged and then supplied to the output terminal, when the CS pin of the control chip U1 detects that the threshold voltage is reached, the transformer T1 is controlled to turn off the transistor Q2, and the operation at the time of T0-T1 is repeated again after the transistor Q2 is completely turned off. The LCC changes the output gain by changing the switching frequency, so that the maximum frequency change is not large when the output current is minimum, and wide load change is realized; the principle of LCC for dimming is to compare the DIM pin voltage of the IC control circuit 103 with the CS and FB pin voltages, amplify the amplified voltages, and then process the amplified voltages in the IC control circuit 103, and then drive and control the switching frequencies of the transistor Q1 and the transistor Q2 to keep the primary side current constant, thereby realizing dimming.
Preferably, the operating principle of the dimming circuit 106 is: the positive voltage of the auxiliary winding of the transformer from T0 to T1 charges the capacitor C23, the resistor R32 and the capacitor LP, and the LP of the inductor L5 is coupled with the LN at the moment, the LP voltage is clamped by the LN, and the clamping voltage is 1-10V port voltage. At the time of T1-T2, the auxiliary winding of the transformer is negative voltage, the capacitor C23, the resistor R31 and the inductor L5 are reversely charged, LP of the inductor L5 is demagnetized and induces reverse voltage, and the positive voltage of the capacitor C23 is neutralized to zero and charged to negative voltage. And (4) at the time T2-T3, the positive voltage of the auxiliary winding of the transformer recharges the capacitor C23, the resistor R31 and the inductor L5, and the actions at the time T0-T1 are repeated.
Referring to fig. 3, the pre-stage rectification filter circuit 101 includes a first input end of alternating current, a second input end of alternating current, and a rectifier bridge;
the first input end of the alternating current is connected with a fuse F1, a thermistor NTC, a voltage dependent resistor VR1, a capacitor C1, a resistor R2, an inductor L1, a capacitor C2 and the first input end of a rectifier bridge; the second input end of the alternating current is connected with the thermistor VR1, the capacitor C1, the resistor R1, the inductor L1, the inductor L2, the capacitor C2 and the second input end of the rectifier bridge;
the resistor R1 is connected with the resistor R2 in series; the inductor L2 is connected with the resistor R3 in parallel; the output end of the rectifier bridge is connected with the input end of the LCC half-bridge resonant cavity circuit 102.
In the embodiment of the utility model provides an in, through alternating current input end input alternating current, the alternating current passes through the filter circuit that electric capacity C1 and inductance L2, inductance L1, electric capacity C2 constitute, then is connected to and reaches the purpose of filtering rectification on the rectifier bridge. The capacitor C1 is a safety capacitor, the inductor L2 is a common-mode inductor, the inductor L1 is a differential-mode inductor, the capacitor C2 is a safety capacitor, and the resistor R1 and the resistor R2 are discharge point resistors.
Referring to fig. 4, the LCC half-bridge resonant cavity circuit 102 includes a rectifier bridge, an inductor L4B, a capacitor C4, and a capacitor C19;
the first input end of the rectifier bridge is connected with a capacitor C17; the second input end of the rectifier bridge is connected with a capacitor C4; the capacitor C4 is connected with the capacitor C3 and the diode D5 in parallel respectively, and the diode D5 is connected with the capacitor C5, the resistor R5, the emitter of the triode Q2 of the capacitor C7, the diode D7 and the capacitor C8;
a second output end of the rectifier bridge is connected with a capacitor C5, a collector of a triode Q1 and a diode D6, a base of the triode Q1 is connected with a transformer T1 through a capacitor C6 and a resistor 4, and an emitter of the triode Q1 is connected with the collector of the triode Q2;
a node between the diode D6 and the diode D7 is connected with the capacitor D8, the inductor L4B, the first input end of the transformer T2 and the capacitor C19;
the second input end of the transformer T2 is respectively connected in parallel with the resistor R10, the resistor R11, the resistor R22 and the resistor R23.
In the embodiment of the utility model, transformer T1 is driving transformer, and the 3 rd foot and the 4 th foot through driving transformer T1 drive switching on and shutting off of triode Q1 and triode Q2 respectively to carry out the energy storage through transformer T2, with energy transfer to secondary rectifier and filter circuit 104. The inductor L4B is a resonant inductor, the capacitor C4 is a resonant capacitor, the capacitor C19 is a secondary side resonant capacitor, the capacitor C5 is an energy storage filter electrolytic capacitor, the transistor Q1 and the transistor Q2 are two alternately switched transistors, and the transformer T2 is an energy storage transformer.
Referring to fig. 6, the secondary rectifying and filtering circuit 104 includes a transformer T2, a diode D10, a diode D11, a capacitor C18, and a resistor R24;
the first end of the secondary rectifying and filtering circuit 104 is respectively connected with a resistor R24, a capacitor C18, a diode D10 and a capacitor C19, and the capacitor C19 is connected with a transformer T2 in series;
the capacitor C19 is connected with a diode D11, and a diode D11 is connected with a transformer T2 in series;
a second output terminal of the secondary rectifying and filtering circuit 104 is commonly connected to the transformer. In the embodiment of the present invention, the capacitor C18 is an electrolytic capacitor, and the resistor R24 is a discharge resistor.
Referring to fig. 7, the toggle switch control circuit 105 includes a resistor R17, a resistor R18, a resistor R36, and a resistor R37;
the CS pin of the IC control circuit 103 is connected to the input terminal of the dial switch control circuit 105 and the switch SW1, the first output terminal of the switch SW1 is connected in parallel to the resistor R17 and the resistor R18, the second output terminal of the switch SW1 is connected in parallel to the resistor R36 and the resistor R37, and the resistor R17 is connected in parallel to the resistor R18, the resistor R36, and the resistor R37 and grounded.
In the embodiment of the utility model provides an in, adjust the resistance value of TC control circuit CS foot through dial switch control circuit 105, can obtain different output current.
Referring to fig. 8, the dimming circuit 106 includes a capacitor C23, a resistor R31, an inductor L5, a rectifier diode D12, and a zener diode ZD 1;
the input end of the dimming circuit 106 is connected with a capacitor C23, a resistor R31 and an inductor L5, and the inductor L5 is connected with a diode D9, a diode D15, a diode D16, a resistor R26 and a DIM pin of the IC control circuit 103;
the resistor R26 is respectively connected with the resistor R33 and the capacitor C22 in parallel;
the inductor L5 is connected with the rectifier diode D12, the voltage stabilizing diode ZD1, the capacitor C27 and the resistor R29; the diode D12 is connected in parallel to the zener diode ZD1 and the capacitor C27, respectively, and the capacitor C27 is connected to the ground.
In the embodiment of the present invention, when the dimming signal is inputted, the voltage on the secondary side of the inductor L5 is changed, the voltage coupled to the secondary side is changed according to the ratio of 1:1 according to the voltage on the secondary side of the inductor L5, and then the voltage is divided by the diode D9, the diode D15, the diode D16, the resistor R26, and the resistor R33 to obtain the DIM signal voltage, which is transmitted to the DIM pin of the IC control circuit 103.
It can be understood that fig. 5 shows that the utility model provides an IC control circuit 103, 1 foot VFB mainly used detect output voltage, and secondary voltage passes through transformer coupling to primary auxiliary winding, through rectifier diode D8, paster electric capacity C11, rectification filter circuit, and the rethread resistance R16 feeds back to IC control chip's VFB foot after resistance R17 partial pressure. The 2-pin DIM mainly receives a dimming signal which is a voltage signal of 0.3-1.3V, when the dimming signal is 0.3V, the voltage on the DIM pin is compared with the voltage on the 8-pin CS and then amplified to the IC control circuit 103 to adjust and control the duty ratio, and at the moment, the output current reaches the lowest state; when the dimming signal is 1.3V, the voltage on the DIM pin is compared with the voltage on the 8-pin CS and amplified to the internal regulation control duty ratio of the IC control circuit 103, and the output current reaches the full-load output state. The 3-pin TX1 and the 4-pin TX2 mainly control the driving transformer T1 to drive the transistor Q1 and the transistor Q2 to be turned on and off. The 5-pin RC mainly detects and adjusts the frequency at the time of start-up. The 6-pin VDD is mainly a power supply pin of the IC control chip. The 7 pin GND is a grounding pin of the IC control chip. The 8-pin CS mainly detects the output current, and when the detected voltage at the pin CS reaches a certain value, the detected voltage is fed back to the IC control circuit 103 to control the on and off of the transistor Q1 and the transistor Q2.
Implement the embodiment of the utility model provides a, following beneficial effect has:
(1) the accuracy is as follows: be different from the secondary side with the problem of light-adjusting IC or MUC collocation opto-coupler time delay of light-adjusting time transmission signal, the utility model discloses a transmission of common mode inductance realizes the quick and accurate transmission of signal.
(2) Stability: different from the opto-coupler because the difference of the different CTR of temperature causes the difference of signal transmission ratio, the utility model discloses under the temperature of difference, the homoenergetic is to signal 1:1, is not influenced by temperature.
(3) The secondary feedback is with peripheral device that adjusts luminance that light IC or MCU collocation opto-coupler carried out the light modulation relatively more and circuit design, and it is more complicated to calculate, the utility model discloses only realize the function of adjusting luminance with a control chip former limit constant current collocation common mode inductance coupling circuit, the design is simple.
(4) The utility model provides a pair of LCC resonant circuit accords with the latest regulation in North America, and the port of adjusting luminance is kept apart with secondary output.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. An LCC resonance dimming control circuit is characterized by comprising a preceding stage rectification filter circuit, an LCC half-bridge resonant cavity circuit, an IC control circuit, a secondary stage rectification filter circuit, a dial switch control circuit and a dimming circuit;
the output end of the preceding stage rectification filter circuit is connected with the input end of the LCC half-bridge resonant cavity circuit;
the LCC half-bridge resonant cavity circuit is respectively connected with the IC control circuit and the secondary rectifying and filtering circuit;
the IC control circuit is connected with the input end of the dial switch control circuit;
the IC control circuit is connected with the dimming circuit.
2. The LCC resonant dimming control circuit of claim 1, wherein the pre-stage rectifier filter circuit comprises a first input of alternating current, a second input of alternating current, and a rectifier bridge;
the first input end of the alternating current is sequentially connected with a protective tube F1, a thermistor NTC, a voltage dependent resistor VR1, a capacitor C1, a resistor R2, an inductor L1 and a capacitor C2, and a capacitor C2 is connected with the first input end of the rectifier bridge; the second input end of the alternating current is connected with a thermistor VR1, a capacitor C1, a resistor R1, an inductor L1, an inductor L2 and a capacitor C2, and a capacitor C2 is connected with the second input end of the rectifier bridge;
the resistor R1 is connected with the resistor R2 in series; the inductor L2 is connected in parallel with the resistor R3; and the output end of the rectifier bridge is connected with the input end of the LCC half-bridge resonant cavity circuit.
3. The LCC resonant dimming control circuit of claim 1, wherein the LCC half-bridge resonant cavity circuit comprises a rectifier bridge, an inductor L4B, a capacitor C4, and a capacitor C19;
the first input end of the rectifier bridge is connected with a capacitor C17; the second input end of the rectifier bridge is connected with a capacitor C4; the capacitor C4 is connected with the capacitor C3 and the diode D5 in parallel respectively, and the diode D5 is connected with the capacitor C5, the resistor R5, the emitter of the triode Q2 of the capacitor C7, the diode D7 and the capacitor C8;
a second output end of the rectifier bridge is connected with a capacitor C5, a collector of a triode Q1 and a diode D6, a base of the triode Q1 is connected with a transformer T1 through a capacitor C6 and a resistor 4, and an emitter of the triode Q1 is connected with the collector of the triode Q2;
a node between the diode D6 and the diode D7 is connected with the capacitor D8, the inductor L4B, the first input end of the transformer T2 and the capacitor C19;
the second input end of the transformer T2 is respectively connected in parallel with the resistor R10, the resistor R11, the resistor R22 and the resistor R23.
4. The LCC resonant dimming control circuit of claim 1, wherein the secondary rectifier filter circuit comprises a transformer T2, a diode D10, a diode D11, a capacitor C18, and a resistor R24;
the first end of the secondary rectifying and filtering circuit is respectively connected with a resistor R24, a capacitor C18, a diode D10 and a capacitor C19, and the capacitor C19 is connected with a transformer T2 in series;
the capacitor C19 is connected with a diode D11, and a diode D11 is connected with a transformer T2 in series;
and the second output end of the secondary rectifying and filtering circuit is connected with the transformer in common.
5. The LCC resonant dimming control circuit of claim 1, wherein the dip switch control circuit comprises a resistor R17, a resistor R18, a resistor R36, and a resistor R37;
the CS pin of the IC control circuit is connected with the ground input end of the dial switch control circuit and the switch SW1, the first output end of the switch SW1 is respectively connected with the resistor R17 and the resistor R18 in parallel, the second output end of the switch SW1 is respectively connected with the resistor R36 and the resistor R37 in parallel, and the resistor R17 is connected with the resistor R18, the resistor R36 and the resistor R37 in parallel and is grounded.
6. The LCC resonant dimming control circuit of claim 1, wherein the dimming circuit comprises a capacitor C23, a resistor R31, an inductor L5, a rectifier diode D12, a zener diode ZD 1;
the input end of the dimming circuit is connected with a capacitor C23, a resistor R31 and an inductor L5, and the inductor L5 is connected with a diode D9, a diode D15, a diode D16, a resistor R26 and a DIM pin of the IC control circuit;
the resistor R26 is respectively connected with the resistor R33 and the capacitor C22 in parallel;
the inductor L5 is connected with the rectifier diode D12, the voltage stabilizing diode ZD1, the capacitor C27 and the resistor R29; the diode D12 is connected in parallel to the zener diode ZD1 and the capacitor C27, respectively, and the capacitor C27 is connected to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821898297.8U CN209824097U (en) | 2018-11-16 | 2018-11-16 | LCC resonance dimming control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821898297.8U CN209824097U (en) | 2018-11-16 | 2018-11-16 | LCC resonance dimming control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209824097U true CN209824097U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821898297.8U Active CN209824097U (en) | 2018-11-16 | 2018-11-16 | LCC resonance dimming control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209824097U (en) |
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2018
- 2018-11-16 CN CN201821898297.8U patent/CN209824097U/en active Active
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