CN2325931Y - Bell-ringing signal source arrangement - Google Patents
Bell-ringing signal source arrangement Download PDFInfo
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- CN2325931Y CN2325931Y CN 97208742 CN97208742U CN2325931Y CN 2325931 Y CN2325931 Y CN 2325931Y CN 97208742 CN97208742 CN 97208742 CN 97208742 U CN97208742 U CN 97208742U CN 2325931 Y CN2325931 Y CN 2325931Y
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Abstract
The utility model relates to a bell-ringing signal source, which has the advantages of simple structure, low cost, and high reliability. The low frequency inverter circuit of the utility model adopts a new topology structure, and thus, one of two MOSFETs for current inverting can be driven directly, and the drive of the other one of the two MOSFETs for current inverting can be simplified. An error amplification and isolation feedback circuit adopts a full-wave precision rectification technique. A current limiting circuit can realize full-wave current limiting. A novel logic circuit is adopted for eliminating peak bur. In addition, auxiliary power supply is generated independently through an auxiliary transformer and does not depend upon a main transformer any longer.
Description
The utility model relates to telephone exchange bell signal source (being called for short the ringing-current source), relates more specifically to ringing-current source medium and low frequency inverter circuit, feedback circuit and current-limiting circuit.
Development along with power electronic technology, the ringing signal source is by early stage linear amplification type, thyrister form develops into the high frequency transformer coupled mode ringing-current source of today, because high_frequency sine wave pulse modulation technology (SPWM) is adopted in manifold type ringing-current source, makes that ringing-current source overall efficiency height, the volume of today are little, in light weight.At present, telephone exchange all adopts this novel ringing-current source to constitute the ringing signal frame basically both at home and abroad.Shenzhen Huawei Company, Beijing BCT, Di Sai, Zhuhai pearl are led to, Hong Kong CP company etc. can both produce this ringing-current source, but shortcomings such as existing ringing-current source ubiquity line construction complexity, components and parts are numerous, processing difficulties make production cost height, production efficiency descend.
Fig. 1 is the schematic block circuit diagram that adopts traditional ringing-current source of existing ringing-current technology composition.This circuit comprises power driving circuit 101, DC circuit 102, AC/DC inverter circuit 103, baseline sinusoidal wave circuit 104, error amplifier circuit 105, current-limiting circuit 106, isolation feedback circuit 107 and Sine Wave Pulse Width Modulation circuit 108.As seen from Figure 1, this ringing-current source mainly is divided into two parts: first is sinusoidal wave high frequency DC-DC conversion part, and it becomes 75V pulsating direct current I1 with 24V or the 48V direct current of input I0 by drive circuit 101 and DC circuit 102; Second portion is a low frequency inversion part, and it becomes 75V AC sine wave I2 with 75V pulsating direct current I1 by AC/DC inverter circuit 103.Because input and output require electrical isolation, so between DC converting part and feedback fraction, add a buffer circuit; And the baseline sinusoidal wave oscillator provides sinusoidal wave benchmark for error amplifier 105; In addition, be current-limiting circuit 106 for safety is added with current foldback circuit at secondary.
Figure 2 shows that the more typically circuit theory diagrams of an example in existing ringing-current source, low frequency inversion principle in described ringing-current source is as follows:
During logical circuit 200 output terminals A 1 high level, make metal-oxide-semiconductor field effect transistor (MONFET) V3 conducting, ringing-current output (Vo) output upper half;
During logical circuit 200 output terminals A 1 low level, make metal-oxide-semiconductor field effect transistor V4 conducting, ringing-current output (Vo) output negative half period.
The frequency of V3, V4 alternate conduction is 25Hz, obtains the 25Hz sine wave at the Vo end.
Described ringing-current source error signal amplification and feedback principle are as follows:
The signal 202 of the output voltage in described ringing-current source behind electric resistance partial pressure compares with the reference signal voltage 204 of baseline sinusoidal wave 104 outputs, the error signal that obtains is after amplifier 205 is amplified, drive triode 206A, 206B, pass through photoelectrical coupler 207A, 207B isolated feedback again to Sine Wave Pulse Width Modulation device 108, remove to regulate output voltage.
When the output of amplifier 205 is just 206A conducting when (i.e. Zheng Xianbo last half-wave), signal feeds back by 207A.
206B conducting when the output of amplifier 205 is negative (i.e. Zheng Xianbo following half-wave), signal feeds back by 207B.
Though this is a practical scheme, there is following several shortcoming:
1.MOSFFT the source electrode of V3, V4 and system works power supply are not altogether, in other words the source electrode of V3 or V4 does not link to each other with secondary GND 2, so in order to drive V3, the V4 change of current, certainly will each with one group of power supply independently, and isolation drive is isolated drive circuits 209 of V3 needs respectively; V4 also needs an isolated drive circuit 210.2. because V3, V4 need independently power drives, for convenience and reliable, these independently power supply often press auxiliary winding to provide by main transformer, make main transformer seem complicated like this.If former limit back work power supply VC, secondary back work positive supply VDD, secondary back work negative supply VSS are provided by the auxiliary winding of main transformer, then main transformer is pressed and will be seemed burdensome more.As shown in Figure 3, the most complicated main transformer has 10 windings, 16 taps.So numerous winding and taps makes the main transformer processing difficulties, and processing cost is higher, has also reduced production efficiency simultaneously.3. in order to solve the baroque problem of main transformer, simplify V3, V4 and drive, the paper that is entitled as " research and the realization in static ringing-current source " in " the academic nd Annual Meeting collection of the 4th power technology in the Northwest " published in 1996 has proposed a solution.This scheme be switch MOS FET drain electrode connect a resistance to its grid with voltage-stabiliser tube voltage stabilizing after as the driving voltage of switching tube V3, V4, control by light-coupled isolation again.Though simplified the driving of V3, V4 like this, may there be the not enough problem that drives, because if V3 is a desirable switch, when the complete conducting of V3, V3 both end voltage VDS will be zero, i.e. VDS=0, drive signal VG also will be zero so, i.e. VG=0.Therefore switching tube V3, V4 will like this, may influence overall efficiency in the face of driving not enough situation.4. feedback loop: by Fig. 2 we also as can be seen, there are two optocouplers and two triodes in the isolated feedback loop of existing ringing-current technology: go up half-wave by optocoupler 207A, triode 206A feedback; Following half-wave is by optocoupler 207B, triode 206B feedback.Simultaneously, it can also be seen that in this feedback arrangement, supporting with it current-limiting circuit needs the similar current limliting unit 211,212 of two covers and controls two photoelectrical couplers respectively from Fig. 2.5. logical circuit: existing ringing-current technology logical circuit commonly used is a comparator.The square wave that it becomes a rule to a quasi-sine-wave goes to drive the change of current and carries out the change of current with metal-oxide-semiconductor field effect transistor V3 and V4.In this manner, tedious " spike burr " appears in the friendship of the half-wave up and down of the sine wave that obtains at output place more, is difficult to eliminate.
The purpose of this utility model is exactly the defective that will overcome above-mentioned prior art, the ringing-current source of provide a kind of simple in structure, with low cost, reliability is high.
For reaching this purpose, the low frequency inverter circuit in the utility model ringing-current source adopts new topological structure (following detailed description again); Under this version, one of two MOSFET that the described change of current uses can directly be driven, another the driving of described two MOSFET is simplified; Error is amplified and isolation feedback circuit adopts all-wave precision rectifying technology, saves 1 photoelectrical coupler; Current-limiting circuit can realize the all-wave current limliting; Adopt new Ying's logical circuit to eliminate " spike burr "; Accessory power supply is no longer dependent on main transformer and produces by auxiliary transformer independently in addition.Concrete division is as follows:
The power driving circuit in the utility model ringing-current source, DC circuit, baseline sinusoidal wave circuit and Sine Wave Pulse Width Modulation circuit are consistent with existing ringing-current technology.
The main composition structure of the low frequency inverter circuit in the utility model ringing-current source is as follows: an end of filter inductance links to each other with the centre cap of the secondary main winding of main transformer, and the other end of filter inductance links to each other with the output of ringing-current circuit; Another the source electrode that is used for the drain electrode of one of two MOSFET of the change of current and described two MOSFET links to each other with two other tap of the secondary main winding of main transformer two terminations after through a rectification circuit respectively; And another the drain electrode of the source electrode of one of described two MOSFET and described two MOSFET links to each other, and links to each other with secondary ground by sample resistance; Owing to only be connected a minimum sample resistance between the source electrode of one of described two MOSFET and the secondary ground, like this, the current potential of the source electrode of one of described two MOSFET can be approximately equal to the current potential on secondary ground, thereby can directly drive it, and driving power can be directly with the working power of secondary; Another of described two MOSFET drives by photoelectrical coupler, and driving power can utilize another the potential difference of source electrode of ringing signal output and two MOSFET to provide dexterously.And the signal that drives is from logical circuit.
Error of the present utility model is amplified and isolation feedback circuit adopts all-wave precision rectifying technology, saves 1 photoelectrical coupler.
Current-limiting circuit of the present utility model can realize the all-wave current limliting.This current-limiting circuit is made up of sample resistance, amplifier, inverter and 2.5V benchmark etc., the principle of current limliting is the size according to load current, the current potential of the transistor base that the clamping diode strangulation that positive half wave links to each other with the output of amplifier by amplifier and negative electrode thereof links to each other with the anode of clamping diode, and by the photoelectrical coupler feedback, restriction SPWM output pulse width; Negative half-wave is by inverter and amplifier, clamping diode strangulation transistor base current potential, and by the photoelectrical coupler feedback, restriction SPWM output pulse width, thus reach the purpose of current limliting.
The logical circuit in the utility model ringing-current source is a proportional amplifier.It is by selecting proper proportion multiplication factor, easy to do " the spike burr " of having eliminated prior art.
The accessory power supply in the utility model ringing-current source is by independently auxiliary transformer generation.
This shows, the utility model ringing-current source is because secondary major loop has only been used a filter inductance, and one of described two MOSFET V3 also can directly drive, reduced by a driving photoelectrical coupler, cancelled the isolation drive accessory power supply, again because isolation feedback circuit adopts all-wave precision rectifying technology, also saved an isolation photoelectrical coupler, therefore, the great advantage in the utility model ringing-current source is to have obtained good result simple in structure, with low cost on the basis that guarantees high-performance, high reliability; Because accessory power supply separates from main transformer, and accessory power supply quantity also reduced, so the coiling of transformer, assembling are also just more succinct, easy; Because accessory power supply independently produces, and is not subjected to the influence of major loop, thereby the reliability in ringing-current source is increased greatly.
The utility model is described in further detail below in conjunction with drawings and Examples, and same section is represented with same numeral in the accompanying drawing.
Fig. 1 is the ringing-current source structure block diagram that adopts high_frequency sine wave pulse modulation technology (SPWM);
Fig. 2 is that existing ringing-current technology low frequency inverter circuit, error are amplified and the isolation feedback circuit schematic diagram;
Fig. 3 is existing ringing-current technology main transformer structural representation;
Fig. 4 is the general structure schematic diagram of the embodiment in the utility model ringing-current source;
Fig. 5 is the circuit theory diagrams of medium and low frequency inverter circuit embodiment illustrated in fig. 4;
Fig. 6 is the circuit theory diagrams of middle error amplification embodiment illustrated in fig. 4 and isolation feedback circuit;
Fig. 7 is the circuit theory diagrams of middle logical circuit embodiment illustrated in fig. 4;
Fig. 8 is the circuit theory diagrams of middle current-limiting circuit embodiment illustrated in fig. 4;
Fig. 9 a is the circuit diagram of the driver element of V3 in the block diagram shown in Figure 5;
Fig. 9 b is the circuit diagram of the isolation drive unit of V4 in the block diagram shown in Figure 5.
As can be seen from Figure 4, the concrete structure of low frequency inverter circuit 402 of the present utility model is as follows: an end of filter inductance 403 links to each other with the centre cap 405 of the secondary main winding 401 of main transformer T1, and the other end of filter inductance 403 links to each other with the output end vo of ringing-current circuit; The source electrode of drain electrode, V4 of V3 that is used for two MOSFET of the change of current links to each other with 409B with two other tap 404,406 of the secondary main winding 401 of main transformer T1 two termination 409A after through a rectification circuit 409 respectively; And the drain electrode of the source electrode of V3 and V4 links to each other, and links to each other with secondary ground GND2 by sample resistance R; Because only be connected a minimum sample resistance R between the source electrode of V3 and the secondary ground GND2, like this, the current potential of the source electrode of V3 can be approximately equal to the current potential of ground GND2, thereby can directly drive, and driving power can directly be used the working power of secondary; V4 is by photoelectrical coupler 423 isolation drive, and its working power provides for link to each other with the other end of resistance 407 reduction voltage circuit of voltage stabilizing didoe 408 compositions that its anode links to each other with the source electrode of V4 of the resistance 407 that links to each other with the output Vo in ringing-current source and negative electrode thereof.And the signal that drives is from logical circuit 410.It can also be seen that from Fig. 4 current-limiting circuit 417 of the present utility model is clamped down on the current potential that drives triode 419 base stages by clamp diode 418, realize current limliting by photoelectrical coupler 421 isolated feedback then; And error of the present utility model is amplified and feedback circuit 411 principles are that output voltage sampled signal 202 relatively amplifies by the error amplifier 105 and the reference signal 204 of baseline sinusoidal wave 104 outputs, pass through the base potential of controlling and driving triode 419 after full-wave rectifying circuit 416 rectifications again, current potential by photoelectrical coupler 421 isolation drive controlling resistances 420, thereby control the output pulse width of Sine Wave Pulse Width Modulation 108, reach the purpose of steady operation.And accessory power supply 424 produces by auxiliary transformer T2 independently, and wherein VDD, VSS are respectively secondary positive and negative accessory power supply, and VC is elementary accessory power supply.
As shown in Figure 5, the low frequency inversion part of the utility model ringing-current source embodiment is made up of V3 and direct drive circuit 501, V4 and isolated drive circuit 502, logical circuit 410 and filter inductance 403 etc., and logic circuit output end A1 makes switch MOS FET pipe V3, V4 realize the low frequency inversion with the frequency alternate conduction of 25Hz.The V4 conducting, the positive half cycle of Vo end output.The V3 conducting, Vo end output negative half period.
Fig. 9 a, Fig. 9 b are respectively the driver element circuit of V3 in the block diagram shown in Figure 5 and the isolation drive element circuit figure of V4.As can be seen from Figure:
When 1, logic circuit output end A1 exports high level, make by resistance 907,908 and to bear back-pressure between triode 902 basic emitter-base bandgap gradings and end, cause photoelectrical coupler 423 to end, thereby make the grid G 4 no drive signals of MOSFET V4 and turn-off, simultaneously, make triode 901 conductings by resistance 905,906, drive signal is added between the grid G 3 and source S 3 of MOSFET V3, the V3 conducting, the output negative half period.Wherein electric capacity 904 is used to absorb clutter.
2, during logic circuit output end A1 output low level; bearing back-pressure between triode 901 base stages and emitter-base bandgap grading ends; thereby MOFET V3 is turn-offed; diode 903 is used to protect the base stage of triode 901, and simultaneously, triode 902 is open-minded; photoelectrical coupler 423 is open-minded; drive signal is added between the grid G 4 and source S 4 of V4, and positive half cycle is exported in the V4 conducting.
The topological structure of inverter circuit can be found out from Fig. 5, hold GND2 to be selected in the other end of the minimum resistance R that links to each other with the tie point of V4 with MOFET V3 secondaryly, in other words, the source electrode of field effect transistor V3 and secondary ground GND2 are approximately same current potential, can utilize the system works power supply directly to drive V3 so easily, not need additional independently isolated from power to drive.
Fig. 6 is the error amplification in the utility model ringing-current source and the circuit theory diagrams of feedback circuit, as can be seen from Figure 6, this feedback circuit is made up of amplifier 105 and the full-wave rectifying circuit of being made up of amplifier 601 and diode 602,603 416, driving triode 419, photoelectrical coupler 421 etc.The voltage of obtaining after the output voltage process dividing potential drop in the utility model ringing-current source 202 is delivered to the reverse input end of amplifier 105, and the standard sine wave signal 204 that produces with baseline sinusoidal wave 104 compares, and amplifies.Error voltage after this amplifies is a quasi-sine-wave, again by amplifier 601 and diode 602 and 603 with this quasi-sine-wave rectification rear drive triode 419, after optocoupler 421 isolated feedback, on resistance 420, obtain a pulsating dc voltage VF, VF is sent to Sine Wave Pulse Width Modulation device 108.Thus, we can be clear that: this circuit is compared with prior art saved an optocoupler, a triode, and is favourable to reducing product cost.
Fig. 7 is the circuit diagram of the logical circuit in the utility model ringing-current source.It is that the output B1 of amplifier 105 amplifies by amplifier 702 and becomes a trapezoidal wave and go to drive the change of current and carry out the change of current with metal-oxide-semiconductor field effect transistor V3 and V4 with a quasi-sine-wave.Though this circuit is a simple anti-phase scale operation amplifier, the selection of ratio R1/R2 directly influences the intermodulation distortion of sine wave output.Its ratio is best between 1.5 to 5.
Fig. 8 is the circuit diagram of the current-limiting circuit in the utility model ringing-current source, this current-limiting circuit is to be the custom-designed current-limiting circuit of Fig. 6 feedback circuit, and the characteristics of this circuit are: finish two half cycle current limlitings about the sine wave output in the feedback system of using a feedback photoelectric coupler.
As can be seen from Figure 8, this current-limiting circuit is made up of sample resistance R, amplifier 801, inverter 802, clamping diode 803 and 2.5V benchmark and divider resistance R3, R10 etc., the principle of current limliting is when load is overweight, the current-limiting circuit action, drive the base potential of triode 419 by clamping diode 803 strangulations, by photoelectrical coupler 421 isolated controlling, thereby limit the SPWM output pulse width, reach the purpose of current limliting.The current limliting operating point can be by selecting ratio 2.5 * R10/ (R10+R3) decision.Below in conjunction with schematic diagram the current limliting principle is done further qualitative explanation:
During operate as normal, amplifier 801 output voltages 804 are high level (approaching operating voltage VDD), along with load current increases, current sampling resistor R both end voltage effective value raises, amplifier 801 output voltages 804 will descend, when sample resistance R both end voltage during near 2.5 * R10/ (R10+R3) V (current limliting set-point), amplifier 801 output voltages 804 will drop to makes clamping diode 803 conductings, drive triode 419 base potential by clamp, thereby make the SPWM output pulse width limited, reach the purpose of current limliting, following half-wave current limliting is by amplifier 801 action, and last half-wave current limliting causes amplifier 801 to be moved by inverter 802 after anti-phase.Thereby only just realize the current limliting of the positive and negative half-wave of output ringing signal by the feedback of a photoelectrical coupler.
Though below describe major technique feature and advantage of the present utility model in detail with preferred forms; but protection range of the present utility model obviously is not limited to above embodiment, but comprises the various conspicuous alternative that those skilled in the art may make above-mentioned creation design.
Claims (9)
1, a kind of ringing signal source comprises power driving circuit (101), main transformer (T1), rectification circuit (409), low frequency inverter circuit (402), baseline sinusoidal wave circuit (104), Sine Wave Pulse Width Modulation circuit (108), error is amplified and isolation feedback circuit (411), current-limiting circuit (417) and accessory power supply (424), it is characterized in that: the low frequency inverter circuit (402) in described ringing signal source also comprises filter inductance (403), be used for two MOSFET (V3) of the change of current and (V4) and drive circuit (501) and (502), logical circuit (410), wherein, one end of filter inductance (403) links to each other with the centre cap (405) of the secondary main winding (401) of main transformer (T1), and the other end of filter inductance (403) links to each other with the output (Vo) of ringing-current circuit; Be used for the drain electrode of one of two MOSFET of the change of current (V3) and described two MOSFET another (V4) source electrode respectively with two other tap (404 of the secondary main winding (401) of main transformer (T1), 406) through two termination (409A behind the rectification circuit (409), 409B) link to each other, and the drain electrode of the source electrode of one of described two MOSFET (V3) and described two MOSFET another (V4) links to each other, and links to each other with secondary ground (GND2) by sample resistance (R); Described accessory power supply (424) comprises independently auxiliary transformer (T2), secondary positive supply (VDD), secondary negative supply (VSS), elementary accessory power supply (VC).
2, ringing-current according to claim 1 source, it is characterized in that: one of described two MOSFET (V3) directly drive with arbitrary known drive circuit, and the used driving power of drive circuit promptly is the secondary positive supply (VDD) in the described accessory power supply (424).
3, ringing-current according to claim 2 source, it is characterized in that: the drive circuit (501) of one of described two MOSFET in described ringing signal source (V3) comprising: its emitter links to each other with the grid (G3) of one of described two MOSFET (V3), and its collector electrode links to each other with time utmost point positive supply (VDD) and base stage is passed through the driving triode (901) that a resistance (906) links to each other with the output (A1) of described logical circuit (410); Emitter resistance (905); Link to each other with the base stage of described driving triode (901) with its negative electrode with the in parallel electric capacity (904) of emitter resistance (905) and diode (903) that its anode links to each other with the emitter of described driving triode (901).
4, according to each described ringing-current source of claim 1-3, it is characterized in that: another of described two MOSFET (V4) drives by photoelectrical coupler (423), and driving power can be provided by the potential difference of ringing signal output (Vo) with the source electrode of two MOSFET another (V4).
5, ringing-current according to claim 4 source, it is characterized in that: the drive circuit (502) of described two MOSFET in described ringing signal source another (V4) comprising: photoelectrical coupler (423), positive-negative-positive triode (902), voltage stabilizing didoe (408) and resistance (407,907,908), wherein, one end of resistance (907) links to each other with the output (A1) of logical circuit, its other end links to each other with the base stage of triode (902), one end of resistance (908) links to each other with the emitter-base bandgap grading of triode (902), the anode of the light-emitting diode in the collector electrode of triode (902) and the photoelectrical coupler (423) links to each other, the negative electrode of the light-emitting diode in the photoelectrical coupler (423) links to each other with time utmost point negative supply (VSS), the emitter-base bandgap grading of the reception triode in the photoelectrical coupler (423) links to each other with the grid of another (V4) of described two MOSFET, the collector electrode of the reception triode in the photoelectrical coupler (423) links to each other with the negative electrode of voltage stabilizing didoe (408), link to each other with an end of resistance (407) simultaneously, the other end of resistance (407) links to each other with the output (Vo) in ringing-current source.
6, ringing-current according to claim 1 source is characterized in that: described error amplify and isolation feedback circuit (411) by baseline sinusoidal wave (104), error amplifier (105), full-wave rectifying circuit (416), drive triode (419) and feedback isolation photoelectrical coupler (421) is formed.
7, ringing-current according to claim 1 source, it is characterized in that: the current-limiting circuit in described ringing signal source is by sample resistance (R), amplifier (801), inverter (802), clamp diode (803), drive triode (419), compositions such as isolated feedback photoelectrical coupler and 2.5V benchmark, when surpassing current-limiting points when described ringing-current source output positive half wave, the current signal that is collected by sample resistance (R) passes through amplifier (801) and the base potential of 2.5V benchmark output (804) relatively through position diode (803) controlling and driving triode (419), thereby realizes Current limited Control by the photoelectrical coupler feedback.
8, according to each described ringing-current source of claim 4-7, it is characterized in that: the logical circuit in the described low frequency inverter circuit (402) in described ringing-current source is a proportional amplifier.
10, ringing-current according to claim 9 source, it is characterized in that: the proportionality coefficient optimum range of proportional amplifier is between 1.5 to 5 in the described logical circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97208742 CN2325931Y (en) | 1997-02-27 | 1997-02-27 | Bell-ringing signal source arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97208742 CN2325931Y (en) | 1997-02-27 | 1997-02-27 | Bell-ringing signal source arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN2325931Y true CN2325931Y (en) | 1999-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97208742 Expired - Lifetime CN2325931Y (en) | 1997-02-27 | 1997-02-27 | Bell-ringing signal source arrangement |
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| CN (1) | CN2325931Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007082491A1 (en) * | 2006-01-23 | 2007-07-26 | Emerson Network Power Co., Ltd. | Sinusoidal reference circuit |
| CN101753746B (en) * | 2008-12-09 | 2012-05-09 | 北京飞音时代技术有限公司 | Trapezoidal wave ringing current generating device controlled by Pulse Width Modulation (PWM) |
| CN101448053B (en) * | 2008-12-22 | 2012-12-26 | 深圳信息职业技术学院 | Ringing current signal generating circuit |
| CN104191076A (en) * | 2014-08-26 | 2014-12-10 | 王建辉 | Voltage and frequency adjusting device |
-
1997
- 1997-02-27 CN CN 97208742 patent/CN2325931Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007082491A1 (en) * | 2006-01-23 | 2007-07-26 | Emerson Network Power Co., Ltd. | Sinusoidal reference circuit |
| CN101753746B (en) * | 2008-12-09 | 2012-05-09 | 北京飞音时代技术有限公司 | Trapezoidal wave ringing current generating device controlled by Pulse Width Modulation (PWM) |
| CN101448053B (en) * | 2008-12-22 | 2012-12-26 | 深圳信息职业技术学院 | Ringing current signal generating circuit |
| CN104191076A (en) * | 2014-08-26 | 2014-12-10 | 王建辉 | Voltage and frequency adjusting device |
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