CN219227433U

CN219227433U - Square wave ringing current power supply

Info

Publication number: CN219227433U
Application number: CN202223025686.9U
Authority: CN
Inventors: 厉振波; 王剑; 方颖; 黄楠
Original assignee: 707th Research Institute of CSIC
Current assignee: 707th Research Institute of CSIC
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-06-20
Anticipated expiration: 2032-11-15

Abstract

The utility model relates to a square wave ringing current power supply, which comprises a filtering module, an SPWM control module and a waveform shaping module, wherein the filtering module is connected in series with the SPWM control module and the waveform shaping module.

Description

Square wave ringing current power supply

Technical Field

The utility model belongs to the technical field of power supplies, and particularly relates to a square wave ringing current power supply.

Background

The ringing current source is also called ringing current signal generator, which is a special type of power source. In a communication switching device, a ring stream source provides a user's communication telephone with a ring signal and a working power supply. Most of the ringing current sources for communication use direct current 36V-72V input voltage, some are centralized ringing current sources, namely, a plurality of independent ringing current sources are combined into a whole through a rack, so as to provide ringing current signals for the whole system. In this case, the output power of the bell flow source is large, but the bell flow source is quite large in size, and is not beneficial to carrying.

The actual circuit of the bell flow source is various, one of which is a filtering method; namely, a square wave signal generated by the royer oscillator is filtered by an LC passive filter to obtain a sine fundamental wave of 25 Hz. The ring current source also adopts a split phase method; the alternating current commercial power with the frequency of 50Hz is changed into the ringing current voltage with the frequency of 25Hz through the action of the split phase capacitor and the transformer. The two methods are not separated from a low-frequency transformer and a filter, and have the defects of low efficiency, heavy volume, high noise, no compliance with the requirements of modern communication equipment and no application in portable communication products.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a square wave ringing power supply, which is characterized in that a group of sine wave generator circuits are added to generate ringing current through a sine wave pulse width modulation (SPWM) technology.

The utility model solves the technical problems by adopting the following technical scheme:

the power supply comprises a filtering module, an SPWM control module and a waveform shaping module, wherein the input end of the filtering module is connected with two paths of voltage input Vin & lt+ & gt and Vin & lt- & gt, the output end of the filtering module is connected with the input ends of the SPWM control module and the waveform shaping module in series, and the output end of the waveform shaping module outputs two paths of voltage output Vout & lt+ & gt and Vout & lt- & gt.

Furthermore, the filtering module comprises common mode inductance and capacitance separation devices.

The SPWM control module comprises an oscillator, a control module, a switch conversion module, a transformer and a protection module, wherein the input end of the protection module is connected with the output end of the waveform shaping module, the output ends of the oscillator and the protection module are connected with the control module, the input end of the control module is input with a power supply Vc, the output end of the control module is connected with the control signal input end of the switch conversion module, the output end of the filter module is connected with the input end of the switch conversion module, the output end of the switch conversion module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the waveform shaping module.

Moreover, the oscillator adopts CD4060, the control module adopts MC3400P, and the switch conversion module adopts UC3841DWTR PWM control chip.

The protection module comprises an over-temperature protection module, an over-voltage protection module, an over-current protection module and a short-circuit protection module.

And the over-temperature protection module is arranged on the switch conversion module.

And the overvoltage protection module is arranged at the output end of the waveform shaping module.

And the overcurrent protection module is arranged at the output end of the waveform shaping module.

And the short-circuit protection module is arranged at the output end of the waveform shaping module.

The utility model has the advantages and positive effects that:

the utility model comprises a filtering module, an SPWM control module and a waveform shaping module, wherein the filtering module is connected in series with the SPWM control module and the waveform shaping module, a 25HZ sine wave signal is generated through an oscillator in the SPWM control module, the 25HZ sine wave signal and a high-frequency signal of tens of KHZ output by the filtering module are modulated in a switch conversion module, a modulated wave with the pulse width changing along with sine is output, the modulated wave is isolated and boosted through a transformer, and a pure sine bell current source is finally obtained through shaping and filtering by a waveform shaper.

Drawings

Fig. 1 is a structural diagram of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

A square wave ringing current power supply is shown in figure 1, and comprises a filtering module, an SPWM control module and a waveform shaping module, wherein the input end of the filtering module is connected with two paths of voltage input Vin & lt+ & gt and Vin & lt- & gt, the output end of the filtering module is connected with the input ends of the SPWM control module and the waveform shaping module in series, and the output end of the waveform shaping module outputs two paths of voltage output Vout & lt+ & gt and Vout & lt- & gt.

The utility model inputs 3.0-5.0V at two paths of voltage input Vin+ and Vin-and inputs direct current, 60V voltage output can be obtained at the output end of the waveform shaping module, the duty ratio is close to 50%, the frequency is 25+/-3 Hz, and the ringing power supply can continuously bell.

The technical parameters are as follows (normal temperature 25 ℃):

input voltage range: vi (vin+ and Vin-) =3.0 to 5.0V

Output voltage: square wave 60V

Operating temperature: -40 to +55 DEG C

Storage temperature: -50 to +65 DEG C

Control voltage:

vo=3v (input voltages Vi (vin+ and Vin-) =3.0 to 5.0V).

When Vc is less than or equal to 0.4V (input voltages Vi (Vin+ and Vin-) =3.0-5.0V), the ringing current converter is in a dormant state. The power consumption is less than or equal to 5 mu A.

Output voltage:

when the input voltages Vi (vin+ and Vin-) =vc=4.5v, and the output terminal is connected to the pure resistor, RL is the load rl=3k connected to the output terminal, and is the subsequent load, the output voltage Voutt is equal to or greater than 55Vrms, and the input current Ii is equal to or less than 400mA.

When input voltages Vi (vin+ and Vin-) =vc=4.5v, when rl=1k, output voltage vout+.38vrms.

When the input voltage Vi (vin+ and Vin-) =vc=4.5v, rl=open circuit, and the no-load input current ii+.80 mA.

Flow limiting: vi (vin+ and Vin-) =vc=4.5v, the output terminal Ring/T is short-circuited with Ring/R, and the input current Ii is less than or equal to 850mA.

The filter module is constructed by adopting a common-mode inductance and capacitance separating device.

The oscillator adopts a CD4060, the CD4060 is a general 14-bit frequency division/oscillator integrated circuit, and the crystal oscillator is formed by an external 3.69MHz crystal oscillator and an internal circuit of the CD 4060. Then dividing the frequency of the oscillating signal by a frequency divider inside the CD 4060;

to stabilize the amplitude of the output ringing signal, the circuit adds a control module. This control module is also called AGC, namely automatic gain control circuit, an integrated circuit called "electronic attenuator", model MC3400P,8 pin DLL package, 2 pin is its gain control end, when the DC voltage on 2 pin rises from 3.5V to 6V, MC3400P voltage gain is reduced from +13dB to-77 dB, the variation is 90dB, its control voltage is supplied by the output ringing signal after partial pressure rectification filtering.

The switch conversion module consists of a PWM control chip UC3841DWTR, an MOS tube and a transformer.

The over-temperature protection module is arranged on the switch conversion module and is adopted. The PWM control chip UC3841DWTR is provided with an over-temperature protection module.

The overvoltage protection module is arranged at the output end of the waveform shaping module. The PWM control chip UC3841DWTR is provided with an overvoltage protection module.

The overcurrent protection module is arranged at the output end of the waveform shaping module. The PWM control chip UC3841DWTR is provided with an overcurrent protection module.

The short-circuit protection module is arranged at the output end of the waveform shaping module. The PWM control chip UC3841DWTR is provided with a short-circuit protection module.

The packaging shell is formed by stamping a valve material which is resistant to electromagnetic interference; and the shell and the base are completely fused into a whole by using a capacitance welding technology. So that the whole ringing source module does not have any electromagnetic leakage gap. The anti-conduction electromagnetic interference and anti-radiation electromagnetic interference capability of the product is improved.

The working principle of the utility model is as follows:

according to the utility model, a 25HZ sine wave signal is generated by an oscillator in the SPWM control module, the 25HZ sine wave signal and a triangular wave signal of tens of KHZ output by the filtering module are respectively added to the input end of a rice steaming box of the switching and converting module for modulation, a modulation wave with variable pulse width is generated, and the envelope curve of the modulation wave is a sine wave. The modulated wave is isolated and boosted by a transformer, and is shaped and filtered by a waveform shaper to finally obtain a pure sine bell current source.

The over-temperature protection module, the over-voltage protection module, the over-current protection module and the short-circuit protection module are used for detecting temperature, voltage and current information on a circuit, inputting the information into the control module, comparing the information with corresponding threshold values by the control module, and performing on-off processing, wherein all the used devices are existing devices and are not innovation points of the utility model.

It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the utility model includes, but is not limited to, the examples described in the detailed description, as other embodiments derived from the technical solutions of the utility model by a person skilled in the art are equally within the scope of the utility model.

Claims

1. A square wave ringing power supply, characterized by: the filter comprises a filter module, an SPWM control module and a waveform shaping module, wherein the input end of the filter module is connected with two paths of voltage input vin+ and Vin-, the output end of the filter module is connected with the input ends of the SPWM control module and the waveform shaping module in series, and the output end of the waveform shaping module outputs two paths of voltage output Vout+ and Vout-,

the filtering module comprises a common-mode inductance and capacitance separation device; the SPWM control module comprises an oscillator, a control module, a switch conversion module, a transformer and a protection module, wherein the input end of the protection module is connected with the output end of the waveform shaping module, the output ends of the oscillator and the protection module are connected with the control module, the input end of the control module is input with a power supply Vc, the output end of the control module is connected with the control signal input end of the switch conversion module, the output end of the filter module is connected with the input end of the switch conversion module, the output end of the switch conversion module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the waveform shaping module; the oscillator adopts CD4060, the control module adopts MC3400P, and the switch conversion module adopts UC3841DWTR PWM control chip;

2. A square wave ringing power supply as in claim 1, wherein: the over-temperature protection module is arranged on the switch conversion module.

3. A square wave ringing power supply as in claim 1, wherein: the overvoltage protection module is arranged at the output end of the waveform shaping module.

4. A square wave ringing power supply as in claim 1, wherein: the overcurrent protection module is arranged at the output end of the waveform shaping module.

5. A square wave ringing power supply as in claim 1, wherein: the short-circuit protection module is arranged at the output end of the waveform shaping module.