CN110582153B - Driving circuit, driving method thereof and electronic ballast - Google Patents
Driving circuit, driving method thereof and electronic ballast Download PDFInfo
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- CN110582153B CN110582153B CN201910708058.4A CN201910708058A CN110582153B CN 110582153 B CN110582153 B CN 110582153B CN 201910708058 A CN201910708058 A CN 201910708058A CN 110582153 B CN110582153 B CN 110582153B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/2885—Static converters especially adapted therefor; Control thereof
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Abstract
The invention provides a driving circuit, a driving method thereof and an electronic ballast, wherein the driving circuit comprises: the power factor correction circuit comprises an input circuit, a rectifying circuit coupled with the input circuit, a power factor correction circuit coupled with the rectifying circuit, an inverter circuit coupled with the power factor correction circuit, a light emitting element coupled with the inverter circuit, and a control chip coupled with the input circuit, the power factor correction circuit and the inverter circuit; the input circuit is used for inputting alternating voltage; the rectifying circuit is used for receiving the alternating voltage and outputting a first direct voltage; the power factor correction circuit is used for receiving the first direct-current voltage and outputting a second direct-current voltage; the control chip is used for receiving the voltage signal of the processed alternating voltage and the second direct voltage and outputting a first control signal to the power factor correction circuit and a second control signal to the inverter circuit; the inverter circuit is used for receiving the second direct-current voltage and converting the second direct-current voltage into alternating-current voltage so as to control the light-emitting element. So as to reduce the conversion stage number of the electric energy and improve the utilization rate of the electric energy.
Description
Technical Field
The present disclosure relates to electronic ballasts, and particularly to a driving circuit, a driving method thereof, and an electronic ballast.
Background
In a conventional HID (High intensity Discharge, electronic ballast), a relatively common input voltage range is generally a single-phase alternating current 90Vac to 265Vac, and under such an input voltage condition, a relatively mature circuit scheme of the HID is generally as follows: the alternating voltage is converted into stable direct current through the boost power factor correction circuit, and then converted into proper alternating voltage and current through the inverter circuit to drive the HID lamp. The circuit scheme is simple and practical and has high cost performance.
However, when the electronic ballast application needs to be compatible with north american industrial power, the input power grid types include five types of 240V/277V/347V/400V/480V, and the input voltage range becomes 180Vac to 528Vac by considering the voltage fluctuation of the power grid, and the adoption of the circuit scheme is obviously not suitable. According to the current technical scheme, if the normal function of the electronic ballast is to be realized, two schemes are provided at present, the first scheme is to add a first-stage voltage reduction circuit on the basis of the circuit scheme, the high-voltage single-phase alternating current input is firstly converted into high-voltage direct current voltage (above 780V) through a boost power factor correction circuit, the high-voltage direct current voltage is converted into medium-low voltage direct current voltage through the first-stage voltage reduction circuit, and finally the medium-low voltage direct current voltage is converted into proper alternating current voltage and current through an inverter circuit to drive the HID lamp. The second is that the single-phase high-voltage AC input is firstly converted into high-voltage DC voltage through a boost power factor correction circuit, then the high-voltage DC voltage is directly used as the input of an inverter circuit, and the inverter circuit converts the high-voltage DC voltage into proper AC voltage and current for driving the HID lamp.
The power factor correction circuits of the two prior art schemes both adopt a boost power factor correction circuit, and the direct current voltage output by the boost power factor correction circuit must be higher than the input voltage, so when the input is a wide range alternating current voltage 180 Vac-528 Vac, the output direct current voltage must be more than 780V, so that two series connection modes are required to be adopted for the filter capacitors on the bus, and the cost is increased.
In addition, in the first scheme, a first-stage voltage reduction circuit is added to reduce the voltage of a direct current bus above 780V, and then the voltage is used as the input of an inverter circuit, at this time, electric energy needs to be converted through three stages of power conversion, namely a power factor correction circuit, the voltage reduction circuit and the inverter circuit, the number of stages of electric energy conversion is multiple, so that the electric energy loss is large, and the conversion efficiency is low; therefore, the circuit has a complex structure and a large number of components, so that the product has a large volume and a heavy weight and is high in cost. In the second scheme, a primary voltage reduction circuit is not added, and the direct-current voltage of the bus above 780V is directly used as the input of the inverter circuit, so that the circuit structure is simplified. However, this also increases the voltage stress of the inverter circuit at the subsequent stage, thereby increasing the design difficulty of the circuit, requiring a higher value for the voltage stress of the switching tube, and increasing the cost. Therefore, the prior art is in need of improvement.
Disclosure of Invention
The application mainly provides a driving circuit, a driving method thereof and an electronic ballast, wherein the driving circuit adopts a two-stage structure, the conversion stage number of electric energy is reduced, the electric energy utilization rate is improved, the circuit structure is simple, the size of a product is reduced, and the cost is reduced.
In order to solve the above main technical problem, a technical solution adopted by the present application is to provide a driving circuit, including:
the control circuit comprises an input circuit, a rectifying circuit coupled with the input circuit, a power factor correction circuit coupled with the rectifying circuit, an inverter circuit coupled with the power factor correction circuit, a light-emitting element coupled with the inverter circuit, and a control chip coupled with the input circuit, the power factor correction circuit and the inverter circuit;
the input circuit is used for inputting alternating-current voltage; the rectifying circuit is used for receiving the alternating voltage and outputting a first direct voltage; the power factor correction circuit is used for receiving the first direct-current voltage and outputting a second direct-current voltage; the control chip is used for receiving a voltage signal of the processed alternating voltage from the input circuit, receiving a second direct voltage from the power factor correction circuit, outputting a first control signal to the power factor correction circuit and outputting a second control signal to the inverter circuit; the inverter circuit is used for receiving the second direct-current voltage and converting the second direct-current voltage into alternating-current voltage according to a second control signal so as to control the light-emitting element to emit light.
In order to solve the above main technical problem, another technical solution adopted by the present application is to provide a driving method of the driving circuit, including:
a driving method of a driving circuit, the driving circuit comprising:
the control circuit comprises an input circuit, a rectifying circuit coupled with the input circuit, a power factor correction circuit coupled with the rectifying circuit, an inverter circuit coupled with the power factor correction circuit, a light-emitting element coupled with the inverter circuit, and a control chip coupled with the input circuit, the power factor correction circuit and the inverter circuit;
the driving method includes:
the input circuit inputs alternating voltage;
the rectifying circuit receives the alternating voltage and outputs a first direct voltage;
the power factor correction circuit receives the first direct-current voltage and outputs a second direct-current voltage to the inverter circuit and the control chip;
the control chip receives the alternating-current voltage and the second direct-current voltage to output a first control signal to the power factor correction circuit and output a second control signal to the inverter circuit;
the inverter circuit receives the second direct current voltage and a second control signal to convert the second direct current voltage into alternating current voltage so as to control the light-emitting element to emit light.
In order to solve the above main technical problem, another technical solution adopted by the present application is to provide an electronic ballast, where the electronic ballast includes any one of the driving circuits described above.
The beneficial effect of this application is: the driving circuit has two-stage circuit structure, namely a power factor correction circuit and an inverter circuit, so that the conversion stage number of electric energy is reduced, the electric energy utilization efficiency can be improved, and in addition, the volume of the product can be reduced and the cost is reduced due to the simple circuit structure.
Drawings
FIG. 1 is a block schematic diagram of a drive circuit of the present invention;
FIG. 2 is a circuit schematic of a first embodiment of the driving circuit of the present invention;
FIG. 3 is a circuit schematic of a second embodiment of the driving circuit of the present invention;
fig. 4 is a circuit diagram of a first embodiment of a driving method of the driving circuit of the present invention;
fig. 5 is a circuit diagram of a second embodiment of a driving method of the driving circuit of the present invention;
fig. 6 is a circuit diagram of a third embodiment of a driving method of the driving circuit of the present invention;
fig. 7 is a schematic diagram of the electronic ballast of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application belong to the protection scope of the present application.
Fig. 1 is a block diagram of a driving circuit according to the present invention. The drive circuit includes: the light-emitting diode comprises an input circuit 11, a rectifying circuit 12 coupled with the input circuit 11, a power factor correction circuit 13 coupled with the rectifying circuit 12, an inverter circuit 14 coupled with the power factor correction circuit 13, a light-emitting element 15 coupled with the inverter circuit 14, and a control chip 16 coupled with the input circuit 11, the power factor correction circuit 13 and the inverter circuit 14.
The input circuit 11 is used for inputting an alternating voltage; the rectifying circuit 12 is used for receiving the alternating voltage and outputting a first direct voltage; the power factor correction circuit 13 is configured to receive the first dc voltage and output a second dc voltage; the control chip 16 is used for receiving the voltage signal u processed by the alternating voltage from the input circuit 11L，uNAnd after receiving the second DC voltage from the power factor correction circuit 13Outputting a first control signal to the pfc circuit 13 and outputting a second control signal to the inverter circuit 14; the inverter circuit 14 is configured to receive the second dc voltage and convert the second dc voltage into an ac voltage according to a second control signal, so as to control the light emitting element 15 to emit light.
Specifically, the control chip 16 includes a first functional module and a second functional module, the first functional module outputs the first control signal for controlling the power factor correction circuit 13, and the second functional module outputs the second control signal for controlling the inverter circuit 14.
In an embodiment, the driving circuit further includes an external communication unit 17 coupled to the control chip 16, and configured to detect a control mode of the control chip 16, so as to send a third control signal to the control chip 16 through the control mode, and the control chip 16 controls the light emitting element 15 through the inverter circuit 14 according to the third control signal.
Fig. 2 is a schematic circuit diagram of a driving circuit according to a first embodiment of the present invention. The alternating voltage input by the input circuit 11 is a wide-range single-phase high-voltage alternating voltage; the first DC voltage U output by the rectification circuit 12inThe voltage is a direct current voltage with sine half-wave pulsation; the second DC voltage V output by the power factor correction circuit 13BusIs a stable direct current voltage.
Wherein the power factor correction circuit 13 includes: the circuit comprises a first switch S1, a first current sampler CT1, a first diode D1, an inductive element L, a second current sampler CT2, a second switch S2, a second diode D2 and a capacitor C.
The first switch S1 includes a first terminal and a second terminal, the first terminal of the first switch S1 is coupled to the positive electrode of the rectifying circuit 12, and the third terminal of the first switch S1 is coupled to the control chip 16; the first current sampler CT1 comprises a first end, a second end and a third end, the first end of the first current sampler CT1 is coupled to the second end of the first switch S1, the third end of the first current sampler CT1 is coupled to the control chip 16, the first diode D1 comprises a first end and a second end, the first end of the first diode D1 is coupled to the second end of the first current sampler CT1, and the second end of the first diode D1 is coupled to the negative electrode of the rectifier bridge 12; the inductive element L comprises a first end and a second end, and the first end of the inductive element L is coupled to the second end of the first current sampler CT 1; the second current sampler CT2 comprises a first terminal, a second terminal and a third terminal, the first terminal of the second current sampler CT2 is coupled to the second terminal of the inductor L; the third end of the second current sampler CT2 is coupled to the control chip 16; the second switch S2 comprises a first terminal, a second terminal and a third terminal, the first terminal of the second switch S2 is coupled to the second terminal of the second current sampler CT2, the second terminal of the second switch S2 is coupled to the second terminal of the first diode D1, and the third terminal of the second switch S2 is coupled to the control chip 16; a second diode D2 including a first end and a second end, the second end of the second diode D2 being coupled to the second end of the inductance element L; and the capacitor C comprises a first end and a second end, the first end of the capacitor C is coupled to the first end of the second diode D2, the first end of the capacitor C is coupled to the control chip 16, and the second end of the capacitor C is coupled to the second end of the first diode D1.
Wherein the first current sampler CT1 is used for sampling the current i of the first switch S1S1To control the current i of the first switch S1S1The second current sampler CT2 is used for sampling the current i of the second switch S2 and is transmitted to the control chip 16S2To control the current i of the second switch S2S2To the control chip 16.
In an embodiment, the driving circuit further includes a first sampling resistor RsenseComprises a first end and a second end, the first sampling resistor RsenseIs coupled to the negative pole of the rectifier bridge 12 and the control chip 16, and the first sampling resistor RsenseIs coupled to a second terminal of the first diode D1.
In another embodiment, the driving circuit includes a second sampling resistor RsenseReferring to fig. 3, the second sampling resistor RsenseComprises a first end and a second end, and the second sampling resistor RsenseIs coupled to the second end of the capacitor C, and the second sampling resistor RsenseIs coupled to the inverter circuit 14 and the control chip 16. Specifically, as shown in fig. 3. In this embodiment, the second sampling resistor RsenseFor sampling current flowing through the bus and matching with the second DC voltage V on the busBusThe input power of the inverter circuit 14 is obtained for the constant power control of the electronic ballast.
Wherein the first sampling resistor RsenseOr a second sampling resistor RsenseAfter signal processing, the sampled current signal is transmitted to the control chip 16.
In one embodiment, the currents i sampled by the first current sampler CT1 and the second current sampler CT2S1And iS2In addition to participating in loop control, it can also be used for overcurrent protection, in particular as long as the current iS1And iS2When any value is larger than the set value, the overcurrent protection is triggered, and then the current output is closed.
In one embodiment, the inverter circuit 14 is a half-bridge circuit, and in another embodiment, the inverter circuit 14 may also be a full-bridge circuit.
The application also provides a driving method of the driving circuit, which specifically comprises the steps that an input circuit 11 inputs alternating-current voltage; the rectifying circuit 12 receives the alternating voltage and outputs a first direct voltage Uin(ii) a The power factor correction circuit 13 receives the first direct current voltage UinAnd outputs a second DC voltage VBusTo the inverter circuit 14 and the control chip 16; the control chip 16 receives an alternating voltage and a second direct voltage VBusTo output a first control signal to the pfc circuit 13 and a second control signal to the inverter circuit 14; the inverter circuit 14 receives the second dc voltage VBusAnd a second control signal for converting the second DC voltage VBusConverted into an alternating voltage to control the light emitting element 15 to emit light.
Specifically, the first functional module of the control chip 16 includes a first determination processing module PWM1 and a second determination processing module PWM2, the first determination processing module PWM1 outputs a first control signal to control the duty ratio of the first switch S1 of the power factor correction circuit 13, and the second determination processing module PWM2 outputs a first control signal to control the duty ratio of the second switch S2 of the power factor correction circuit 13.
Specifically, please refer to fig. 4, which is a circuit diagram illustrating a driving method of a driving circuit according to a first embodiment. In this embodiment, the range of the ac voltage input by the input circuit 11 is 180V-265V, and the first determining processing module PWM1 of the control chip 16 outputs a first control signal to control the duty ratio of the first switch to be D s11, controlling the first switch S1 to normally open the first switch S1; the second determination processing module PWM2 of the control chip 16 samples the second dc voltage VBusCurrent i of the second switch S2S2And a first DC voltage UinAnd performing closed-loop control, wherein the first DC voltage UinVoltage signal u processed by AC voltage inputted by input circuitL，uNTo derive, in particular, a first direct voltage UinEquivalent to voltage signal uL，uNOutputting a first control signal to control the duty ratio of the second switch S2 to be DS2. Specifically, the second determination processing module PWM2 of the control chip 16 obtains the second dc voltage VBusCurrent i of the second switch S2S2And a first DC voltage UinThen, the double closed-loop control of the current inner loop and the voltage outer loop is carried out, thereby obtaining the duty ratio D of the second switch S2S2Thereby, the input current can be realized to follow the input voltage, and the bus voltage (namely the second direct current voltage V) can be enabledBus) And keeping stable.
In the embodiment, the control mode can enable the circuit to obtain a higher power factor (even if the power factor approaches 1) and a smaller current THD value, and further, the conversion efficiency of the electric energy can also keep a higher value.
Fig. 5 is a circuit diagram illustrating a driving method of a driving circuit according to a second embodiment. In this embodiment, the range of the ac voltage input by the input circuit 11 is 265V to 365V, and the first determining processing module PWM1 of the control chip 16 receives the first dc voltage UinThen outputting a first control signal to control the duty ratio of the first switch S1 to be DS1＝K1-K2×Uin(ii) a Wherein, K1And K2Is a constant number, K1Without unit, K2Has a unit of V-1，UinIs a first dc voltage.
In this embodiment, when the first DC voltage U outputted by the rectifying circuit 12inWhen the duty ratio is smaller, the duty ratio D of the first switch S1 output by the first judgment processing module PWM1S1When the duty ratio is larger than 0.9 and close to 1, due to the limitation of the delay and the switching speed of the driving circuit, the duty ratio is larger than 0.9 and cannot be distinguished, the actual driving effect is equal to the duty ratio of 1, and at this time, the following two control strategies are correspondingly adopted:
first, the first judgment processing module PWM1 of the control chip 16 controls the duty ratio D of the first switch S1S1Is kept at 0.9, this scheme can make the duty ratio D of the first switch S1 outputted by the first judgment processing module PWM1S1The change is continuous, so the controlled input current has no abrupt change, the waveform is smooth, the power factor value is higher and is closer to 1, and a better input current THD value can be obtained. In the present embodiment, since the maximum value of the duty ratio is maintained at 0.9, the first switch S1 has a switching action in each cycle.
In the present embodiment, the duty ratio D of the first switch S1S1The maximum value of (d) may be 0.9, or may be other values, specifically determined by the performance of the driver circuit.
Second, the first judgment processing module PWM1 of the control chip 16 controls the duty ratio D of the first switch S1S1When the duty ratio is more than 0.9, the duty ratio D of the first switch S1 is controlledS1Directly equal to 1, i.e. when the first direct voltage U is output by the rectifier circuit 12inWhen small, the first switch S1 remains normally onIn this state, the first switch S1 remains in a normally-on state for the period of time, thereby reducing switching loss and improving power conversion efficiency.
In this embodiment, the first judgment processing module PWM1 of the control chip 16 has two control strategies, but in the two control strategies, the control method of the second judgment processing module PWM2 is the same, and specifically, the second judgment processing module PWM2 of the control chip 16 samples the second dc voltage VBusCurrent i of the first switch S1S1Current i of the second switch S2S2And a first DC voltage UinAnd performing closed-loop control, specifically, performing double closed-loop control on the voltage outer loop and the current inner loop by using the second determination processing module PWM2 of the control chip 16, and outputting a first control signal to control the duty ratio of the second switch S2 to be DS2To control the second switch S2 so that the input current follows the input voltage, thereby making the power factor of the pfc circuit approach 1 and stabilizing the output voltage.
In the present embodiment, the second determination processing module PWM2 of the control chip 16 samples the current i of the first switch S1 at the same timeS1Current i of the second switch S2S2Therefore, a current i to the first switch S1 is requiredS1Current i of the second switch S2S2Summing to obtain the equivalent input current i during the switching periodSAnd then enters a current loop to participate in loop control.
Wherein the current i of the first switch S1S1Current i of the second switch S2S2The summation formula of (a) is specifically:
iS＝iS2×DS2+iS1×(DS1-DS2)。
fig. 6 is a circuit diagram illustrating a driving method of a driving circuit according to a third embodiment. In this embodiment, the range of the ac voltage input by the input circuit 11 is 365V-528V, and the second determination processing module PWM2 of the control chip 16 receives the first dc voltage UinThen outputting a first control signal to control the duty ratio of the second switch S2 to be DS2＝N1-N2×Uin(ii) a Wherein N is1And N2Is a constant number, N1Without unit, N2Has a unit of V-1，UinIs a first dc voltage.
In this embodiment, the first determining and processing module PWM1 of the control chip 16 samples the second dc voltage VBusCurrent i of the first switch S1S1Current i of the second switch S2S2And a first DC voltage UinAnd performing closed-loop control, specifically, performing double closed-loop control on the voltage outer loop and the current inner loop by the first judgment processing module PWM1 of the control chip 16, and outputting a duty ratio D of the first switch S1S1To control the first switch S1 so that the input current follows the input voltage, thereby making the power factor of the pfc circuit approach 1 and stabilizing the output voltage.
In this embodiment, the first determination processing module PWM1 of the control chip 16 samples the current i of the first switch S1 at the same timeS1Current i of the second switch S2S2Therefore, a current i to the first switch S1 is requiredS1Current i of the second switch S2S2Summing to obtain the equivalent input current i during the switching periodsAnd then enters a current loop to participate in loop control.
Wherein the current i of the first switch S1S1Current i of the second switch S2S2The summation formula of (a) is specifically:
iS＝iS2×DS2+iS1×(DS1-DS2)。
in this embodiment, when the first DC voltage U outputted by the rectifying circuit 12inWhen the duty ratio is larger, the duty ratio D of the second switch S2 output by the second judgment processing module PWM2S1When the duty ratio is less than 0.1 and close to 0, due to the limitation of the delay and the switching speed of the driving circuit, the duty ratio is not distinguished below 0.1, the actual driving effect is equal to the duty ratio of 0, and at this time, the following two control strategies are correspondingly adopted:
first, the second judgment processing module PWM2 of the control chip 16 controls the duty ratio D of the second switch S2S2Is the most important ofThe small value is kept at 0.1, which can make the duty ratio D of the second switch S2 output by the second judgment processing module PWM2S2The change is continuous, so the controlled input current has no abrupt change, the waveform is smooth, the power factor value is higher and is closer to 1, and a better input current THD value can be obtained. In the present embodiment, since the minimum value of the duty ratio is kept at 0.1, the second switch S2 has a switching action in each cycle.
In the present embodiment, the duty ratio D of the second switch S2S2The minimum value of (d) may be set to 0.1, or may be set to other values, specifically determined by the performance of the driver circuit.
Second, the second judgment processing module PWM2 of the control chip 16 controls the duty ratio D of the second switch S2S2When the duty ratio is less than 0.1, the duty ratio D of the second switch S2 is setS2Directly equal to 0, i.e. when the first direct voltage U is output by the rectifier circuit 12inWhen larger, the second switch S2 remains in the off state, and the second switch S2 remains in the off state for that period of time, so that switching loss is reduced and power conversion efficiency is improved.
The three voltage ranges described above (180V-265V, 265V-365V, 365V-528V) are not fixed numerical ranges, which are only general trends. When the input AC voltage is low, the peak voltage is lower than the output voltage (i.e. the second DC voltage V)Bus) The control scheme shown in fig. 4 is adopted when the voltage is 0.95 times, the control method is simple, the circuit can obtain a high power factor (even if the power factor approaches 1) and a small current THD value, and high electric energy conversion efficiency can be maintained.
When the peak value of the input AC voltage is higher than the output voltage (i.e. the second DC voltage V)Bus) 0.95 times of the first voltage, and does not exceed the output voltage (i.e., the second DC voltage V)Bus) 1.2-1.3 times, the control scheme shown in fig. 5 is adopted, in which case the first switch S1 is only at the first dc voltage UinThe duty ratio is changed near the peak position of the bus, and the state of normal open or maximum duty ratio is kept at other times, so that the circuit can ensure the bus voltage (namely the second direct current voltage V)Bus) Keep stable and can realize good public serviceFlat factor value and high electric energy conversion efficiency.
When the peak value of the input AC voltage is larger than the output voltage (i.e. the second DC voltage V)Bus) 1.2-1.3 times, the control scheme shown in fig. 6 is adopted, when the second switch S2 is at the first direct current voltage UinGreater than the second DC voltage VBus1.2-1.3 times of the first voltage, keeping the state of turn-off or minimum duty ratio, and otherwise, keeping the state according to the first direct current voltage UinThe duty cycle is adjusted. This control method is more suitable for the case where the input ac voltage is higher than the second control method (fig. 5), and can achieve a better THD value and a smaller power loss, thereby improving the power conversion efficiency.
Referring to fig. 7, a schematic diagram of an electronic ballast according to the present invention is shown, where the electronic ballast 100 includes the driving circuit 101, and the electronic ballast 100 is one of the ballasts, and refers to an electronic device that uses electronic technology to drive an electric light source to generate a required illumination. Corresponding to this is an inductive ballast (or ballast). Modern fluorescent lamps are increasingly provided with electronic ballasts, which are light and small, and even can integrate the electronic ballasts with lamp tubes and the like, and meanwhile, the electronic ballasts can have the function of a starter, so that the independent starter can be omitted. The electronic ballast can also have more functions, such as improving or eliminating the flickering phenomenon of the fluorescent lamp by increasing the current frequency or the current waveform (such as changing the current waveform into a square wave); the fluorescent lamp can use a direct current power supply through a power supply inversion process. Some of the disadvantages of conventional inductive rectifiers are making them being replaced by increasingly sophisticated electronic ballasts.
In this embodiment, only a part of the related circuits are described in the driving circuit, and other functional circuits are the same as those of the driving circuit in the prior art, and are not described herein again.
The application provides a drive circuit, optimized power factor correction circuit and control mode rather than, made its condition that adapts to more wide range input and higher voltage input to simplify whole electronic ballast's circuit structure, reduced the voltage stress of circuit, therefore can improve the electric energy utilization efficiency of ballast greatly, use the reducible electronic components quantity of this kind of circuit scheme (like relay, filter capacitor, inductance etc.) in addition, thereby reduce the volume weight of product, reduce cost.
The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the claims and their equivalents, or by direct or indirect application to other related arts.
Claims (13)
1. A driver circuit, comprising:
the control circuit comprises an input circuit, a rectifying circuit coupled with the input circuit, a power factor correction circuit coupled with the rectifying circuit, an inverter circuit coupled with the power factor correction circuit, a light-emitting element coupled with the inverter circuit, and a control chip coupled with the input circuit, the power factor correction circuit and the inverter circuit;
the input circuit is used for inputting alternating-current voltage; the rectifying circuit is used for receiving the alternating voltage and outputting a first direct voltage; the power factor correction circuit is used for receiving the first direct-current voltage and outputting a second direct-current voltage; the control chip is used for receiving a voltage signal of the processed alternating voltage from the input circuit, receiving a second direct voltage from the power factor correction circuit, outputting a first control signal to the power factor correction circuit and outputting a second control signal to the inverter circuit; the inverter circuit is used for receiving the second direct-current voltage and converting the second direct-current voltage into alternating-current voltage according to a second control signal so as to control the light-emitting element to emit light;
wherein the power factor correction circuit comprises: the current sampling circuit comprises a first switch, a first current sampler, a first diode, an inductance element, a second current sampler, a second switch, a second diode and a capacitor; the first switch comprises a first end, a second end and a third end, the first end of the first switch is coupled with the anode of the rectifying circuit, and the third end of the first switch is coupled with the control chip; the first current sampler comprises a first end, a second end and a third end, wherein the first end of the first current sampler is coupled with the second end of the first switch, and the third end of the first current sampler is coupled with the control chip; the first end of the first diode is coupled with the second end of the first current sampler, and the second end of the first diode is coupled with the negative electrode of the rectifying circuit; the inductive element comprises a first end and a second end, and the first end of the inductive element is coupled with the second end of the first current sampler; the second current sampler comprises a first end, a second end and a third end, and the first end of the second current sampler is coupled with the second end of the inductive element; the third end of the second current sampler is coupled with the control chip; the second switch comprises a first end, a second end and a third end, the first end of the second switch is coupled with the second end of the second current sampler, the second end of the second switch is coupled with the second end of the first diode, and the third end of the second switch is coupled with the control chip; the second diode comprises a first end and a second end, and the second end of the second diode is coupled with the second end of the inductance element; the capacitor comprises a first end and a second end, the first end of the capacitor is coupled with the first end of the second diode, the first end of the capacitor is coupled with the control chip, and the second end of the capacitor is coupled with the second end of the first diode;
the first current sampler is used for sampling the current of a first switch so as to transmit the current of the first switch to the control chip; the second current sampler is used for sampling the current of a second switch so as to transmit the current of the second switch to the control chip;
the control chip receives the alternating-current voltage from the input circuit and receives a second direct-current voltage from the power factor correction circuit, and then outputs a first control signal to the first switch and the second switch according to the range of the alternating-current voltage so as to control the duty ratio of the first switch and the second switch, and further enables the second direct-current voltage to be stable.
2. The driving circuit according to claim 1, further comprising: and the external communication unit is coupled with the control chip and used for detecting the control mode of the control chip so as to send a third control signal to the control chip through the control mode, and the control chip controls the light-emitting element through the inverter circuit according to the third control signal.
3. The drive circuit according to claim 1,
the alternating voltage input by the input circuit is wide-range single-phase high-voltage alternating voltage;
the first direct-current voltage output by the rectifying circuit is direct-current voltage with sine half-wave pulsation;
and the second direct current voltage output by the power factor correction circuit is stable direct current voltage.
4. The driving circuit according to claim 1, further comprising:
the first end of the first sampling resistor is coupled with the negative electrode of the rectifying circuit and the control chip, and the second end of the first sampling resistor is coupled with the second end of the first diode; or
The first end of the second sampling resistor is coupled to the second end of the capacitor, and the second end of the second sampling resistor is coupled to the inverter circuit and the control chip;
and the first sampling resistor or the second sampling resistor transmits the sampled current signal to the control chip after signal processing.
5. The driving circuit of claim 1, wherein the inverter circuit is a half-bridge circuit or a full-bridge circuit.
6. A driving method of a driving circuit, the driving circuit comprising:
the control circuit comprises an input circuit, a rectifying circuit coupled with the input circuit, a power factor correction circuit coupled with the rectifying circuit, an inverter circuit coupled with the power factor correction circuit, a light-emitting element coupled with the inverter circuit, and a control chip coupled with the input circuit, the power factor correction circuit and the inverter circuit; wherein the power factor correction circuit comprises: the current sampling circuit comprises a first switch, a first current sampler, a first diode, an inductance element, a second current sampler, a second switch, a second diode and a capacitor; the first switch comprises a first end, a second end and a third end, the first end of the first switch is coupled with the anode of the rectifying circuit, and the third end of the first switch is coupled with the control chip; the first current sampler comprises a first end, a second end and a third end, wherein the first end of the first current sampler is coupled with the second end of the first switch, and the third end of the first current sampler is coupled with the control chip; the first end of the first diode is coupled with the second end of the first current sampler, and the second end of the first diode is coupled with the negative electrode of the rectifying circuit; the inductive element comprises a first end and a second end, and the first end of the inductive element is coupled with the second end of the first current sampler; the second current sampler comprises a first end, a second end and a third end, and the first end of the second current sampler is coupled with the second end of the inductive element; the third end of the second current sampler is coupled with the control chip; the second switch comprises a first end, a second end and a third end, the first end of the second switch is coupled with the second end of the second current sampler, the second end of the second switch is coupled with the second end of the first diode, and the third end of the second switch is coupled with the control chip; the second diode comprises a first end and a second end, and the second end of the second diode is coupled with the second end of the inductance element; the capacitor comprises a first end and a second end, the first end of the capacitor is coupled with the first end of the second diode, the first end of the capacitor is coupled with the control chip, and the second end of the capacitor is coupled with the second end of the first diode;
the driving method includes:
the input circuit inputs alternating voltage;
the rectifying circuit receives the alternating voltage and outputs a first direct voltage;
the power factor correction circuit receives the first direct-current voltage and outputs a second direct-current voltage to the inverter circuit and the control chip; the first current sampler is used for sampling the current of a first switch so as to transmit the current of the first switch to the control chip; the second current sampler is used for sampling the current of a second switch so as to transmit the current of the second switch to the control chip;
the control chip receives the alternating-current voltage from the input circuit and receives a second direct-current voltage from the power factor correction circuit, and then outputs a first control signal to the first switch and the second switch according to the range of the alternating-current voltage so as to control the duty ratio of the first switch and the second switch, and further enable the second direct-current voltage to be stable;
the inverter circuit receives the second direct current voltage and a second control signal to convert the second direct current voltage into alternating current voltage so as to control the light-emitting element to emit light.
7. The driving method according to claim 6,
the step of the control chip outputting a first control signal to the first switch and the second switch according to the range of the ac voltage after receiving the ac voltage from the input circuit and receiving a second dc voltage from the power factor correction circuit to control the duty ratios of the first switch and the second switch specifically includes:
the control chip comprises a first functional module and a second functional module, the first functional module outputs the first control signal and is used for controlling the power factor correction circuit, and the second functional module outputs a second control signal and is used for controlling the inverter circuit;
the first function module comprises a first judgment processing module and a second judgment processing module, the first judgment processing module outputs a first control signal to control the duty ratio of a first switch of the power factor correction circuit, and the second judgment processing module outputs a first control signal to control the duty ratio of a second switch of the power factor correction circuit.
8. The driving method according to claim 7,
the input circuit inputs an alternating voltage within a range of 180V-265V, and a first judgment processing module of the control chip outputs a first control signal to control the duty ratio of the first switch to be DS1Turning on the first switch normally 1;
a second judgment processing module of the control chip samples the second direct current voltage, the current of the second switch and the first direct current voltage and carries out closed-loop control, and outputs a first control signal to control the duty ratio of the second switch to be DS2。
9. The driving method according to claim 7,
the range of the alternating voltage input by the input circuit is 265-365V, and the first judgment processing module of the control chip outputs a first control signal to control the duty ratio of the first switch to be D after receiving the first direct voltageS1＝K1-K2×Uin；
Wherein, K1And K2Is constant, UinIs a first direct current voltage;
a second judgment processing module of the control chip samples a second direct current voltage, the current of the first switch, the current of the second switch and the first direct current voltage and carries out closed-loop control, and outputs a first control signal to control the duty ratio of the second switch to be DS2；
Wherein the current of the first switch and the current of the second switch are summed to obtain an equivalent input current in a switching period:
iS＝iS2×DS2+iS1×(DS1-DS2)；
wherein D isS1And DS2Duty cycles, i, of the first and second switches, respectivelyS1And iS2The currents of the first switch and the second switch, respectively.
10. The driving method according to claim 9,
if the duty cycle of the first switch is DS1More than 0.9, the duty ratio of the first switch is DS10.9 or the duty cycle of the first switch is DS1＝1。
11. The driving method according to claim 7,
the range of the alternating-current voltage input by the input circuit is 365V-528V, and the second judgment processing module of the control chip outputs a first control signal to control the duty ratio of the second switch to be D after receiving the first direct-current voltageS2＝N1-N2×Uin；
Wherein N is1And N2Is constant, UinIs a first direct current voltage;
the first judgment processing module of the control chip samples the second direct current voltage, the current of the first switch, the current of the second switch and the first direct current voltage and carries out closed-loop control, and outputs a first control signal to control the duty ratio of the first switch to be DS1；
Wherein the current of the first switch and the current of the second switch are summed to obtain an equivalent input current in a switching period:
iS＝iS2×DS2+iS1×(DS1-DS2)；
wherein D isS1And DS2Respectively being the first switch and the second switchDuty cycle of the switch, iS1And iS2The currents of the first switch and the second switch, respectively.
12. The driving method according to claim 11,
if the duty cycle D of the second switchS2Less than 0.1, the duty cycle of the second switch is DS20.1 or the duty cycle of the second switch is DS2＝0。
13. An electronic ballast comprising a driver circuit as claimed in any one of claims 1 to 5.
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