CN104981051A - Universal interface compatible with LED and fluorescent lamp ballast and derivative circuit of universal interface - Google Patents

Abstract

The invention aims at providing a universal interface for applying an LED to fluorescent lamp electronic ballast and an inductance ballast bracket without dismounting the original lamp and modifying circuits of original equipment. The universal interface is accessed into a bracket by a three-phase rectifier bridge or a four-phase rectifier bridge, wherein the direct-current side Out of the rectifier bridge is connected with the input end of a CRF circuit input or a CTRF circuit; the output end of the CRF circuit output or the CTRF circuit is used as a direct-current power supply for supplying power to the LED and a drive/filter circuit of the LED; and the universal interface comprises various derivative circuits; The universal interface has the advantages that the CTRF or the CRF circuit ensures normal start-up of the ballast, so that the compatibility of an interface circuit is improved; and the CTRF can ensure that the LED is driven by direct current to normally work on the ballast; and the universal interface can be almost universally used on the electronic ballast bracket and the inductance ballast bracket for replacing the fluorescent lamp, and is more energy-saving.

Description

The general-purpose interface of a kind of LED and fluorescent lamp ballast compatibility and derive from circuit

Technical field

The invention belongs to field of LED illumination, particularly a kind of interface circuit with fluorescent lamp ballast compatibility, be specifically LED is common to electronic ballast for fluoresent lamp and Inductive ballast interface circuit and derive from circuit.

Background technology

The interface circuit of LED and fluorescent lamp ballast compatibility and LED (application number: 201320613209.6 is not yet announced) thereof provide the interface circuit of a kind of electric ballast and LED compatibility.Due to the electric ballast of high frequency can be used for, the Inductive ballast of low frequency must be used for, but find in process of the test, though can work on the support of Inductive ballast, but DC side current ripples is excessive, this is because its filter circuit is aimed at the high-frequency design of about 30kHz, invalid to low frequency, consider the impact of ripple on the life-span of LED, therefore propose a kind of more general interface circuit to be substantially applicable to electronics, Inductive ballast.

Summary of the invention

The object of this invention is to provide one do not needing to remove original light fixture, when not needing to reequip the circuit of original equipment yet, LED is used for the general-purpose interface of electronic ballast for fluoresent lamp and Inductive ballast lamp socket, it is characterized in that: adopt three-phase commutation bridge, four commutating phase bridges, 2+3 commutating phase bridge circuit or 2x2+4 commutating phase bridge circuit access support, the DC side of three-phase or four commutating phase bridges connects CRF circuit or CTRF circuit input end Out, the output of CRF circuit or CTRF circuit is that LED and driving/filter circuit thereof are powered as DC power supply, comprise multiple derivation circuit, in 2+3 commutating phase bridge circuit or 2x2+4 commutating phase bridge circuit, full bridge rectifier DC side connects CRF circuit or CTRF circuit input end Out, and the DC side of three-phase or four commutating phase bridges need not connect CRF or CTRF circuit, described full bridge rectifier refers to by two Diode series as a brachium pontis, and the tie point of diode is as a phase of brachium pontis, and two brachium pontis are in parallel as DC side, have the rectification circuit of two-phase.CTRF circuit principal character is, input Out cross-over connection DC capacitor C, in parallel with DC capacitor after being connected with resistance R1 by switch; CRF circuit principal character is, input cross-over connection DC capacitor C, and on DC capacitor parallel resistance R.Advantage is, CTRF or CRF circuit guarantees the normal startup of ballast, improves the compatibility of interface circuit, and CTRF can ensure that LED DC driven normally works on ballast, substantially can be common to electric ballast support and Inductive ballast support; Described driving/filter circuit refers to, DC drive circuit or low-pass filter circuit.

2+3 commutating phase bridge circuit or 2x2+4 commutating phase bridge circuit, 2+3 commutating phase bridge circuit refers on the basis of three phase rectifier bridge circuit, full bridge rectifier is connected at negative electrode A, a two ends, 2x2+4 commutating phase bridge circuit refers on the basis of four commutating phase bridge circuits, connect full bridge rectifier at negative electrode A, a two ends, connect another full bridge rectifier at negative electrode B, b two ends.

A kind of CTRF circuit of the general-purpose interface for LED and fluorescent lamp ballast compatibility, it is characterized in that, be positioned at LED filtering or drive circuit previous stage, at input cross-over connection DC capacitor C, in parallel with DC capacitor C after switch is connected with resistance R1, as the positive source of LED filter circuit or DC driven after electric capacity C positive pole series diode Fr, electric capacity C negative pole is as the power cathode of LED filter circuit or DC driven.

A kind of CRF circuit of the general-purpose interface for LED and fluorescent lamp ballast compatibility, it is characterized in that, be positioned at LED filtering or drive circuit previous stage, at input cross-over connection DC capacitor C, resistance R is in parallel with DC capacitor C, as the positive source of LED filter circuit or DC driven after electric capacity C positive pole series diode Fr, electric capacity C negative pole is as the power cathode of LED filter circuit or DC driven.

The object of this invention is to provide a kind of detection LED being used for the general-purpose interface of electronic ballast for fluoresent lamp and Inductive ballast lamp socket and derive from circuit, comprise Series FPB and parallel FPB, tandem type refers to: adopt the network be made up of electric capacity, inductance or resistance to access a phase or heterogeneous of three-phase commutation bridge and four commutating phase bridges as testing circuit series connection, the terminal voltage of the one or more elements in testing circuit or current signal are drawn as measuring-signal.Parallel connection type refers to: or directly impedance is connected across rectifier bridge as testing circuit and four commutating phase bridges are any two alternate, or after rectifier bridge and any two alternate voltage signals of four commutating phase bridges are carried out convergent-divergent, signal is applied to impedance two ends, the terminal voltage of the one or more elements in impedance or current signal are drawn as measuring-signal; Described impedance refers to the network be made up of electric capacity, inductance or resistance.Advantage is, just can judge to work in electric ballast or Inductive ballast, thus it drives switching working mode to adapt to working condition by the terminal voltage change detecting element in passive network.

Patent accompanying drawing

Fig. 1 is four commutating phase bridge circuit figure.

Fig. 2 is three-phase commutation bridge circuit diagram.

Fig. 3 is 2+3 commutating phase bridge circuit figure.

Fig. 4 is the circuit diagram of CRF.

Fig. 5 is one of circuit diagram of CTRF.

Fig. 6 is the circuit diagram two of CTRF.

Fig. 7 is the timing controling signal circuit diagram of CTRF circuit.

Fig. 8 is the three-phase commutation bridge circuit diagram of tandem type measuring circuit.

Fig. 9 is the three-phase commutation bridge circuit diagram of parallel connection type measuring circuit.

Figure 10 is the magnetic control standard driving commutation circuit figure for tandem type measuring circuit.

Figure 11 is optically controlled chip select circuit figure.

Figure 12 is PWM2 signal generating circuit figure.

Embodiment

The invention provides the general-purpose interface of a kind of LED and fluorescent lamp ballast compatibility and derive from circuit, comprising three-phase or four commutating phase bridge places in circuit, CRF circuit or CTRF circuit, tandem type measuring circuit, parallel connection type measuring circuit.

Embodiment 1CRF circuit and CTRF circuit

CRF circuit and CTRF circuit are connected to the DC side of three-phase or four commutating phase bridge circuits, are intended to the versatility ensureing interface circuit.

Fig. 1 is four commutating phase bridge circuit figure, and in Fig. 1, es is the equivalent AC power supply of ballast, and four cathode contacts of straight pipe type fluorescent lamp support or ring fluorescent lamp are A, a, B, b; Fr1 and Fr2 series connection becomes a brachium pontis, the tie point of Fr1 and Fr2 is as a phase of rectifying bridge arm, similarly, four rectifying bridge arms are composed in series between two by eight fast recovery diode Fr1 to Fr8, the DC side parallel of four brachium pontis, together as DC output end Out1, is connected respectively to four cathode contacts A, a, B, b after four phases extractions of four rectifying bridge arms.

Fig. 2 is three-phase commutation bridge circuit diagram, and in Fig. 2, es is the equivalent AC power supply of ballast, four cathode contacts of straight pipe type fluorescent lamp support or ring fluorescent lamp are A, a, B, b, A, a are in one end of support, and B, b are at the other end of support, and it is very near that ring fluorescent lamp two ends are leaned on; Cathode contact B, b short circuit is as the first-phase of negative electrode, and contact A is as second-phase, and contact a is as third phase; Fr1 and Fr2 series connection becomes a brachium pontis, the tie point of Fr1 and Fr2 is as a phase of rectifying bridge arm, similarly, three rectifying bridge arms are composed in series between two by six fast recovery diodes Fr1, Fr2, Fr3, Fr4, Fr7, Fr8, the DC side parallel of three brachium pontis, together as DC output end Out1, is connected respectively to the three-phase of negative electrode after the three-phase extraction of three-phase commutation bridge.2+3 commutating phase bridge circuit or 2x2+4 commutating phase bridge circuit can be adopted in addition, 2+3 phase refers on the basis of three phase rectifier bridge circuit in fig. 2, full bridge rectifier is connected at negative electrode A, a two ends, 2x2+4 commutating phase bridge circuit refers on the basis of four commutating phase bridge circuits in FIG, connect full bridge rectifier at negative electrode A, a two ends, connect another full bridge rectifier at negative electrode B, b two ends.

Fig. 3 is 2+3 commutating phase bridge circuit figure.In Fig. 3, diode Fr9-Fr12 constitutes the full bridge rectifier of two-phase, and the two-phase of full bridge rectifier is connected with negative electrode A, a respectively, and the DC side of full bridge rectifier is not connected with the DC side of three phase rectifier bridge circuit.

In like manner, 2x2+4 commutating phase bridge circuit has two full bridge rectifiers, and a full-bridge circuit two-phase is connected with negative electrode A, a respectively, and another full-bridge circuit two-phase is connected with negative electrode B, b respectively, and the DC side of two full-bridge ballasting circuits can be connected in parallel.The DC side of full-bridge ballasting circuit can be powered for DC circuit.

Fig. 4 is the circuit diagram of CRF.In Fig. 4, direct-flow input end Out is the DC output end Out1 (the DC output end Out1 that can be understood as Fig. 1 or Fig. 2 is connected to the input Out of CRF) of Fig. 1 or Fig. 2, CRF refers to the circuit be made up of electric capacity C, resistance R, diode Fr: in parallel with resistance R as input Out by electric capacity C, as the positive pole of DC power supply after positive pole "+" the series connection fast recovery diode Fr of Out end, the negative pole "-" of Out end is as the negative pole of DC power supply, and DC power supply is that the DC driven of LED or filter circuit are powered.

Fig. 5 is one of circuit diagram of CTRF.In Fig. 5, direct-flow input end Out is the DC output end Out1 (the DC output end Out1 that can be understood as Fig. 1 or Fig. 2 is connected to the input Out of CTRF) of Fig. 1 or Fig. 2, CTRF refers to: it is one group that resistance R1 connects with switch T1 (electronic power switch or mechanical switch), as input Out after this group is in parallel with electric capacity C and resistance R, as the positive pole of DC power supply after positive pole "+" the series connection fast recovery diode Fr of Out end, the negative pole "-" of Out end is as the negative pole of DC power supply, and DC power supply is that the DC driven of LED or filter circuit are powered.Increasing switch T1 is switching in order to controlling resistance R1, and time initial, Out terminal voltage Uout rises to threshold values, drops into R1 immediately, to coordinate the start-up course of electric ballast, starts and to terminate and after DC driven/filter circuit normally works, excision R1.The switching time of R1 can be controlled by a simple timing circuit.

Fig. 6 is the circuit diagram two of CTRF.In Fig. 6, direct-flow input end Out is the DC output end Out1 (the DC output end Out1 that can be understood as Fig. 1 or Fig. 2 is connected to the input Out of CTRF) of Fig. 1 or Fig. 2, CTRF refers to: it is one group that resistance R1 connects with switch T1 (normally closed mechanical switch), as input Out after this group is in parallel with electric capacity C, as the positive pole of DC power supply after positive pole "+" the series connection fast recovery diode Fr of Out end, the negative pole "-" of Out end is as the negative pole of DC power supply, and DC power supply is that the DC driven of LED or filter circuit are powered.Time initial, switch T1 is normally closed, and R1 drops into, and after DC driven/filter circuit normally works, inductance L flows through larger current, produces enough magnetic field absorption switch T1, is excised by R1, and the switching time of R1 can also be controlled by a simple timing circuit in addition.

Fig. 7 is the timing controling signal circuit of CTRF circuit.In Fig. 7, PWM1 is the drive singal of the CTRF circuit breaker in middle T1 of Fig. 5, signal Uout is that DC voltage value signal resistance R0 and the C0 of the direct-flow input end Out of Fig. 5 forms delay delay circuit, delay delay circuit and XOR gate XOR and form rising edge testing circuit with door And, when the rising edge of signal Uout arrives, export a rectangular pulse as PWM1 signal with door And, its width is determined by C0 and the R0 product w of delay circuit, w=C0 × R0, w are larger, and width is wider; When PWM1 Square wave pulses arrives, Fig. 5 breaker in middle T1 closes, and resistance R1 drops into, and at the end of PWM1 Square wave pulses, Fig. 5 breaker in middle T1 disconnects, and resistance R1 exits; So regulate w can regulate the making time of resistance R1 in Fig. 5.Can not want with door And, when not using with door And, be edge sense circuit, now in Fig. 5, resistance R can get higher value or remove.

Embodiment 2 is common to the interface circuit of electronics and Inductive ballast

CRF circuit described in embodiment 1 and CTRF circuit improve the compatibility of interface circuit, but be common to electronics and Inductive ballast also needs specific filter circuit or drive circuit, according to be drive circuit, then also need suitable control method and control circuit to ensure its stability and high efficiency work, Gu mention at this.

In Fig. 4, Fig. 5 or Fig. 6, DC driven/filter circuit is filter circuit, only retains electric capacity C1, when C1 capacity is 1000uF, is operated on 40W Inductive ballast support, its ripple is less than ± and 6%, work in electric ballast support, its ripple is much smaller than ± 1%.

In Fig. 4, Fig. 5 or Fig. 6, DC driven/filter circuit is DC driven, the DC voltage value of direct-flow input end Out is Uout, the threshold values Uth that Uout deducts setting obtains dU, dU through low-pass filtering and according to a certain percentage coefficient carry out convergent-divergent [such as: adopt PI (proportional integral controller proportion adjustment or integral adjustment) controller, its integral adjustment can realize low-pass filtering, its proportion adjustment can carry out convergent-divergent], obtain DC component magnitude of voltage dUdc, in dUdc, power frequency and harmonic component thereof obtain very large suppression, are almost 0; DUdc and triangle wave generate pwm signal, i.e. PWM2 signal, control switch T2; DUdc is directly proportional to pwm signal duty ratio, is directly proportional to the electric current flowing through LED, then the power output of DC driven is directly proportional to dUdc.The object done like this is the stable of the DC component voltage ensureing Uout, thus ensure steady operation on ballast: when Uout is higher than Uth, dU is greater than 0, after proportion adjustment, the degree that DC driven power output rises is greater than the output of ballast support with Uout, dU trends towards the positive number (this static receiver error that to be positive number be in FEEDBACK CONTROL) of non-zero, Uout trends towards Uth, when Uout is lower than Uth, pwm pulse duty ratio is 0, switch does not work, interface is consumed energy not, Uout voltage rise, so, voltage stabilization is near Uth, then ballast is stably to interface circuit injecting power, interface circuit is stably to drive circuit transmission power.

These are only example, ensure that the Method and circuits of LED circuit stability and high efficiency work is many, but its antecedent basis is the interface circuit that three-phase commutation bridge provided by the invention or four phase ballast bridges form with CRF circuit or CTRF circuit.

The interface circuit that be common to ballast of embodiment 3 with measuring circuit

Fig. 8 is the three phase rectifier bridge circuit of tandem type measuring circuit, in Fig. 8, es is the equivalent AC power supply of ballast, four cathode contacts of straight pipe type fluorescent lamp support or ring fluorescent lamp are A, a, B, b, A, a are in one end of support, B, b are at the other end of support, and it is very near that ring fluorescent lamp two ends are leaned on; Cathode contact B, b short circuit is as the first-phase of negative electrode, and contact A is as second-phase, and contact a is as third phase; Fr1 and Fr2 series connection becomes a brachium pontis, the tie point of Fr1 and Fr2 is as a phase of rectifying bridge arm, three rectifying bridge arms are composed in series between two by six fast recovery diode Fr1-Fr6, the DC side parallel of three brachium pontis is together as DC output end Out1, one of three-phase commutation bridge is connected to the first-phase of negative electrode after being in series and measuring electric capacity Ct, remaining two-phase of three-phase commutation bridge is connected respectively to all the other two-phases of negative electrode.

Fig. 9 is the three phase rectifier bridge circuit of parallel connection type measuring circuit, in Fig. 9, es is the equivalent AC power supply of ballast, four cathode contacts of straight pipe type fluorescent lamp support or ring fluorescent lamp are A, a, B, b, A, a are in one end of support, B, b are at the other end of support, and it is very near that ring fluorescent lamp two ends are leaned on; Cathode contact B, b short circuit is as the first-phase of negative electrode, and contact A is as second-phase, and contact a is as third phase; As measuring circuit 1 after electric capacity Ct connects with resistance Rt, be connected across negative electrode first-phase and second-phase two ends, in like manner, measuring circuit 2 is connected across negative electrode first-phase and third phase two ends.

Figure 10 is the magnetic control standard driving commutation circuit for tandem type measuring circuit, and Tu10Zhong, DC power supply Out1 are that in Fig. 8, DC output end Out1, DC power supply Out2 are DC output end Out1 in Fig. 2; LED is driven by two drive circuits, and the DC power supply of first driving (i.e. DC driven/filtering) circuit is Out1, and the DC power supply of second drive circuit (i.e. non-isolated/isolation drive) circuit is Out2; The measurement electric capacity Ct anode Ts+ of Ts-to be the measurement electric capacity Ct negative terminal TS-of measuring circuit in Fig. 8, Ts+ be measuring circuit in Fig. 8; Electromagnetic relay/switch accesses power supply Out2 after connecting with driving, and electromagnetic relay/switch control rule second switching driven.

Its course of work is: when being operated in electric ballast, is high frequency, and the electric capacity Ct impedance of measuring circuit is minimum, terminal voltage is almost 0, and electromagnetic relay/switch disconnects, and second driving does not work, first drives normal work, and LED is driven by first drive circuit; When being operated in power frequency 50Hz, be low frequency, electric capacity Ct impedance is large, and terminal voltage is high, and electromagnetic relay/switch closes, and second drives work, and first driving works hardly, and LED is driven by second drive circuit; Way like this, utilizes capacity cell to realize the switching of LED control circuit in the impedance variation of different frequency, reaches the object being substantially common to electronics, inductor rectifier.

Figure 11 is optically controlled chip select circuit, the Ts1-of Tu11Zhong, Ts1+ to be the Ts1+ of measuring circuit shown in Fig. 9, Ts1-be measuring circuit shown in Fig. 9, and Ts2+, Ts2-are in like manner; Optical coupling isolator 1 and 2, respectively to after Ts1 and Ts2 rectifying and wave-filtering, is converted into semaphore, carries out logic OR OR to semaphore, and logic OR OR exports as chip selection signal CS.

Figure 12 is PWM2 signal generating circuit.In Figure 12, the drive singal PWM2 of CS to be the CS of chip selection signal described in Figure 11, PWM2 be DC driven in Fig. 4 or Fig. 5; Pwm signal is the pwm signal that current constant control produces, and CS carries out logic OR with pwm signal after reverser, produces PWM2 signal; When electric ballast support for high frequency, CS signal is low level, pwm signal conductively-closed, and PWM2 signal is always high level, and when Inductive ballast for low frequency, CS signal is high level, and namely pwm signal is pwm signal.

Total course of work is, capacity cell is very big in the impedance variation of high and low frequency, the information of working condition is obtained by the terminal voltage of Detection capacitance element, when capacitance terminal voltage is almost 0, show to be operated in high frequency, chip selection signal CS low level, regardless of pwm signal, PWM2 exports high level all the time, and the switch of DC driven described in Fig. 4 or Fig. 5 is open-minded all the time, utilizes electric capacity and inductance to carry out filtering rear drive LED; When capacitance terminal voltage is almost AC power es voltage, PWM2 is pwm signal, and be now low frequency, ripple is difficult to filtering, switches to and adopts DC driven pattern to carry out current constant control.

These are only example, carry out the driving method method of pattern switching according to working condition and circuit many, similarly, analog circuit is adopted to carry out convergent-divergent to measured signal, by the passive network of this signal by electric capacity, inductance or resistance composition, the voltage and current signal of one or more element in measurement network, is undertaken this signal simply relatively or logic can obtain working condition; In addition adopt digital circuit to carry out sampling analysis and also can obtain working condition, but its antecedent basis is interface circuit provided by the invention.

The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (5)

1. the general-purpose interface of a LED and fluorescent lamp ballast compatibility, it is characterized in that: adopt three-phase commutation bridge or four commutating phase bridge joints to enter ballast support, the DC side of three-phase, four commutating phase bridges, 2+3 commutating phase bridge circuit or 2x2+4 commutating phase bridge circuit connects CRF circuit or CTRF circuit input end Out, the output of CRF circuit or CTRF circuit is that LED and driving/filter circuit thereof are powered as DC power supply, comprises multiple derivation circuit: the series, parallel type testing circuit of derivation; CTRF circuit, its principal character is, input cross-over connection DC capacitor C, in parallel with DC capacitor C after being connected with resistance R1 by switch; CRF circuit, its principal character is, input cross-over connection DC capacitor C, and resistance R is in parallel with DC capacitor C.

2. the CTRF circuit for the general-purpose interface of LED and fluorescent lamp ballast compatibility, it is characterized in that, be positioned at LED filtering or drive circuit previous stage, at input cross-over connection DC capacitor C, in parallel with DC capacitor C after switch is connected with resistance R1, as the positive source of LED filter circuit or DC driven after electric capacity C positive pole series diode Fr, electric capacity C negative pole is as the power cathode of LED filter circuit or DC driven.

3. the CRF circuit for the general-purpose interface of LED and fluorescent lamp ballast compatibility, it is characterized in that, be positioned at LED filtering or drive circuit previous stage, at input cross-over connection DC capacitor C, resistance R is in parallel with DC capacitor C, as the positive source of LED filter circuit or DC driven after electric capacity C positive pole series diode Fr, electric capacity C negative pole is as the power cathode of LED filter circuit or DC driven.

4. LED is used for the tandem type testing circuit of the general-purpose interface of electronic ballast for fluoresent lamp and Inductive ballast lamp socket by one kind, it is characterized in that: adopt the network be made up of electric capacity, inductance or resistance to access a phase or heterogeneous of three-phase commutation bridge and four commutating phase bridges as testing circuit series connection, the terminal voltage of the one or more elements in testing circuit or current signal are drawn as measuring-signal.

5. LED is used for the parallel connection type testing circuit of the general-purpose interface of electronic ballast for fluoresent lamp and Inductive ballast lamp socket by one kind, it is characterized in that: or directly impedance is connected across rectifier bridge as testing circuit and four commutating phase bridges are any two alternate, or after rectifier bridge and any two alternate voltage signals of four commutating phase bridges are carried out convergent-divergent, signal is applied to impedance two ends, the terminal voltage of the one or more elements in impedance or current signal are drawn as measuring-signal; Described impedance refers to the network be made up of electric capacity, inductance or resistance.