CN102121951A - Method for measuring power of halogen lamp - Google Patents
Method for measuring power of halogen lamp Download PDFInfo
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- CN102121951A CN102121951A CN2010105750985A CN201010575098A CN102121951A CN 102121951 A CN102121951 A CN 102121951A CN 2010105750985 A CN2010105750985 A CN 2010105750985A CN 201010575098 A CN201010575098 A CN 201010575098A CN 102121951 A CN102121951 A CN 102121951A
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- halogen lamp
- metal halogen
- frequency converter
- power
- load
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Abstract
The invention discloses a method for measuring the power of a halogen lamp. A secondary winding coil is added close to a choking coil in a high-frequency converter circuit of the halogen lamp to form mutual inductance so as to serve as an electric signal acquisition part; and two ends of the secondary winding coil are connected to a singlechip, which is convenient for the singlechip to directly collect electric signals on the winding coil. The singlechip is used for processing the collected signal to calculate the power of the halogen lamp. A processing result is output and displayed, and can be used for regulating and controlling the power of the lamp (load), thereby improving the working efficiency of the halogen lamp. Because the lamp (load) is positioned on the indefinite potential of a control ground, i.e. a load ground is an off ground, a traditional weak-current circuit can not accurately measure the power of a low-frequency load under the high-frequency converter, and the load ground is coupled with a power ground by a transformer or an optoelectronic coupler in the common method. With the measuring method, the defects are overcome, on-line measurement is realized, and the adopted measuring circuit is simple; and the measuring method is easy to operate, is quick and accurate to measure and is suitable for all half-bridge circuits.
Description
Technical field
The present invention relates to a kind of power measurement method of gas-discharge lamp, particularly relate to a kind of power measurement method of Metal halogen lamp.
Background technology
Because Metal halogen lamp is operated in the singularity of the half-bridge circuit of high-frequency converter, lamp (load) is positioned on the indefinite current potential on control ground, conventional method will be coupled to power supply ground by transformer or photoelectric device, so use conventional method promptly in circuit the method for resistance in series to measure the power difficulty of Metal halogen lamp very big, present measuring method to Metal halogen lamp power mainly contains utilizes voltage sensor, current sensor to measure, and need to adopt DSP technology, this kind measuring method complexity and cost height.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of measuring method of simple, easy-operating Metal halogen lamp power.
The technical solution used in the present invention, Metal halogen lamp power measurement method promptly provided by the present invention is as follows:
Described Metal halogen lamp adopts high-frequency converter to drive, and then for the power choke coil in the described high-frequency converter circuit is provided with a secondary winding coil, is used to respond to Metal halogen lamp operating voltage signal Vp;
The Metal halogen lamp operating voltage signal Vp and the signal period Ts that adopt the secondary winding coil of single-chip microcomputer collection to sense, and the real work voltage Vo of calculating Metal halogen lamp;
Adopt single-chip microcomputer to calculate the average working current Io of Metal halogen lamp,
Promptly be to the current i on the choke induction
LCarry out envelope and quadrature, ask the leg-of-mutton area of choke induction electric current envelope in the one-period; Wherein, D1 is a metal-oxide-semiconductor conducting dutycycle in the high-frequency converter circuit, and D2 is a diode current flow dutycycle in the high-frequency converter circuit, and L is a power choke coil sense value, and Vs is the high-frequency converter input voltage, and Vo is the Metal halogen lamp real work voltage that calculates;
Then Metal halogen lamp power is
Compared with prior art, measuring method of the present invention can measure Metal halogen lamp power fast and accurately by means of succinct measurement counting circuit, and cost is low; It is broken the normal procedure and adopts transformer or photoelectric coupled device could realize load ground and the coupling of power supply ground the method for measurement to realize online measurement that measuring method is easy to operate; And the output of described measurement result shown and be used for adjusting and control, can effectively improve the Metal halogen lamp work efficiency lamp (load) power; Described measuring method is applicable to all half-bridge circuits.
Description of drawings
Fig. 1 is a metering circuit embodiment schematic diagram of the present invention;
Equivalent circuit theory figure when Fig. 2 is operated in stable state for metering circuit of the present invention;
Fig. 3 is electric current and the voltage oscillogram on the secondary winding coil.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the present invention is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is the metering circuit embodiment principle schematic that measuring method of the present invention adopted, described Metal halogen lamp adopts high-frequency converter to drive, described high-frequency converter comprises the driving circuit 1 that two metal-oxide-semiconductors and two diodes are formed, the power choke coil 2 that is connected with the driving circuit output terminal, load Rp1 represents Metal halogen lamp.The method of the invention promptly increases secondary winding coil 3 on power choke coil 2 next doors, and secondary winding coil 3A, B two ends are connected with single-chip microcomputer.As the high-frequency converter input voltage is Vs, and Vs forms an AC signal through the high frequency conversion circuit, the power choke coil 2 of flowing through, then on auxiliary winding coil 3, produce induced voltage and induction current, gather induced voltage on this pair winding coil 3 and detectable voltage signals cycle by single-chip microcomputer.
When described high-frequency converter is operated in stable state, high-frequency converter is simplified, can obtain circuit as shown in Figure 2, Metal halogen lamp is this circuit load.Induced voltage that produces on the inductive coil among the figure and induction current waveform are as shown in Figure 3.
As figure shows, inductance in the described high-frequency converter (being equivalent to power choke coil) is operated under the discontinuous pattern of electric current, when the phase, Ts began weekly, and inductive current i
LSince 0 linear increasing, behind peaking, begin to descend, when dropping to for 0 stylish cycle, inductive current also do not begin.Voltage signal on the inductance auxiliary winding has comprised the lamp voltage signal of Metal halogen lamp, is about to be multiplied by a COEFFICIENT K (K=N1/N2 is the turn ratio of the former secondary of inductance) from the magnitude of voltage of auxiliary winding coil up-sampling, has just obtained the modulating voltage Vo of Metal halogen lamp.
By the current waveform of Fig. 2 as can be known, load current Io is i during stable state
LMean value in the period T s time, promptly
Wherein, L is a power choke coil sense value, and Vs is the high-frequency converter input voltage, and Vo is the Metal halogen lamp real work voltage that calculates.And D
1Be metal-oxide-semiconductor conducting dutycycle, i.e. D in the high-frequency converter circuit
1=t1/Ts, t1 are the metal-oxide-semiconductor ON time, and this time can be detected by single-chip microcomputer and obtain; D
2Be diode current flow dutycycle in the high-frequency converter circuit, can be by calculating.
If the current change quantity on the telefault is Δ i, because metal-oxide-semiconductor conduction period,
During the diode current flow
Because Δ i
L1=| Δ i
L2|, so have
Then can calculate D
2
The final power that adopts following formula to calculate Metal halogen lamp
Calculate Metal halogen lamp power and it is fed back to the driver of Metal halogen lamp by said method, when realizing on-line measurement lamp (load) power is better regulated and controlled.
Below only for the preferable embodiment of the present invention, conceive under the prerequisite not breaking away from the present invention, the present invention is made some subtle change and is equal to replacement, all belong to protection scope of the present invention.
Claims (5)
1. Metal halogen lamp power measurement method:
Described Metal halogen lamp adopts high-frequency converter to drive, and for the power choke coil in the described high-frequency converter circuit is provided with a secondary winding coil, is used to respond to Metal halogen lamp operating voltage signal Vp;
The Metal halogen lamp operating voltage signal Vp and the signal period Ts that adopt the secondary winding coil of single-chip microcomputer collection to sense, and the real work voltage Vo of calculating Metal halogen lamp;
Adopt single-chip microcomputer to calculate Metal halogen lamp working current Io,
Wherein, D1 is a metal-oxide-semiconductor conducting dutycycle in the high-frequency converter circuit, and D2 is a diode current flow dutycycle in the high-frequency converter circuit, and L is a power choke coil sense value, and Vs is the high-frequency converter input voltage, and Vo is the Metal halogen lamp real work voltage that calculates;
Then Metal halogen lamp power is
2. according to claims 1 described power measurement method, it is characterized in that: the real work voltage Vo=Vp*K of described Metal halogen lamp, wherein K is the turn ratio of power choke coil and its auxiliary winding coil.
3. according to claims 1 described Metal halogen lamp power measurement method, it is characterized in that: metal-oxide-semiconductor conducting dutycycle D1=t1/Ts in the described high-frequency converter circuit, wherein t1 is the metal-oxide-semiconductor ON time.
4. according to claims 3 described Metal halogen lamp power measurement methods, it is characterized in that: described metal-oxide-semiconductor ON time t1 is detected by single-chip microcomputer and obtains.
5. according to claims 1 described Metal halogen lamp power measurement method, it is characterized in that: diode current flow dutycycle D2 passes through formula in the described high-frequency converter circuit
Obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105750985A CN102121951A (en) | 2010-11-30 | 2010-11-30 | Method for measuring power of halogen lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105750985A CN102121951A (en) | 2010-11-30 | 2010-11-30 | Method for measuring power of halogen lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102121951A true CN102121951A (en) | 2011-07-13 |
Family
ID=44250548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105750985A Pending CN102121951A (en) | 2010-11-30 | 2010-11-30 | Method for measuring power of halogen lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102121951A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04253187A (en) * | 1991-01-28 | 1992-09-08 | Sansha Electric Mfg Co Ltd | Power source device for metal halide lamp |
| CN201114931Y (en) * | 2007-08-01 | 2008-09-10 | 嘉兴市光泰照明有限公司 | Electronic ballast for small power metal halogen lamp |
-
2010
- 2010-11-30 CN CN2010105750985A patent/CN102121951A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04253187A (en) * | 1991-01-28 | 1992-09-08 | Sansha Electric Mfg Co Ltd | Power source device for metal halide lamp |
| CN201114931Y (en) * | 2007-08-01 | 2008-09-10 | 嘉兴市光泰照明有限公司 | Electronic ballast for small power metal halogen lamp |
Non-Patent Citations (1)
| Title |
|---|
| Y.K.TAN等: "Two-Stage Metal Halide Lamp Electronic Ballast with Constant Output-Power Control", 《PROCEEDINGS OF THE 11~(TH) INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS VOLUME 4》 * |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110713 |