TW201238227A - A switch power supply with frequency tuner - Google Patents

Abstract

A switching power supply with PWM controlling device comprises a rectifier, a transformer, an output circuit, a switch device, a PWM control device and a frequency tuner used for modulating switch frequency of PWM control device. The frequency tuner comprises a first modulated frequency resistor, second modulated frequency resistor and third modulated frequency resistor, first by pass switch, second by pass switch, first reference voltage device, second reference voltage device. The first by pass switch connects with first modulated resistor and first reference voltage device respectively. The second by pass switch connects with second modulated resistor and second reference voltage device respectively.

Description

201238227 VI. Description of the Invention: [Technical Field] The present invention relates to a power supply for a power supply switching device switching frequency. [Prior Art] In particular, an exchange type having a tunable pulse width as shown in Fig. 1, the rectifying device u receives-inputs an alternating voltage' and rectifies it into a direct current, and outputs it to the input terminal of the transformer T1. The primary winding of the Weier τι receives the rectified DC power, and the energy is stored in the secondary winding when the switching device 13 is turned on. When the switching device 13 _, the first woven group stored in the transformer η is transmitted to the third winding. Group. The "road 15" is set between the secondary and the load, which is used to push the direct money to the load. The feedback circuit n receives the output of the money supply. The output of the power supply is transmitted back to the pulse width modulation (PWM) circuit 19 via the return path to the (four)_device 13. - Normally exchanged electric detectors should be lightly loaded (Light L. (4) or no load (N〇Load) 0 wins 'lower output energy' if operating at a normal switching frequency, relative to the power consumption of the switching power supply ( If the ratio of 'switching loss' becomes larger, the efficiency of the whole machine will decrease. When the switching power supply is matched with the system in the peak load (peakL〇ad) application, the output drive capability design will be limited due to material or cost considerations. Often when the switching power supply is applied to the peak load of the system, the output voltage drops (v〇ltage Dr〇p). For example, when the switching power supply supplies power to a printer, due to the printer The machine needs a large power supply at the moment of starting, and at this time, the output voltage of the power supply is likely to be lowered and cannot be started. In view of this, it is necessary to develop an exchange type capable of stabilizing the output power at peak load (peaklord). 4 201238227 SUMMARY OF THE INVENTION The main object of the present invention is to provide a _ fresh continent by adjustable pulse width modulation control (hereinafter referred to as PWM control relay) To resolve - when Lin Power Supply System AC ^ || _ _ solution sad big problem, the money is in the peak load (iv) improving the # lord) 'waste output down' cause the output power is reduced. . In order to achieve the above object, the present invention provides an exchange power supply device with a frequency conversion device, which comprises a rectifier power supply thief, and the rectifier device can be a bridge rectifier H transformer device. Transmitting a DC power source rectified by the rectifying device, and transmitting from the sub-nen group of the transformer device to the secondary winding; an output circuit comprising a rectifying diode and a filter capacitor for the secondary side a DC power supply of the winding is output to the load device; a switching device is connected to the primary winding; a PWM control device is connected to the switching device; a feedback circuit, which is coupled to the output circuit and coupled to the other end Connected to the PWM control device; a variable frequency modulation device for modulating the switching frequency of the pWM control device, comprising a first frequency modulation resistor connected to the pwM control device, a first reference voltage circuit and a second The reference voltage circuit is respectively connected to the PWM control device, and respectively comprises a voltage regulator diode connected in series with a voltage stabilizing capacitor, the voltage stabilizing capacitor is connected in parallel with a trigger resistor; and a second frequency modulation power Connected between the pWM control device and a first bypass switch, the bypass switch may be a semiconductor component; a third frequency modulation resistor 'crosses between the PWM control device and a second bypass switch The bypass switch may be a semiconductor component; wherein the first bypass switch is coupled to the first reference voltage circuit; and the second bypass switch is coupled to the second reference voltage circuit. According to another embodiment of the present invention, an exchange power supply with a frequency conversion device, wherein the variable frequency modulation device for modulating the switching frequency of the PWM control device includes a first reference voltage circuit and a second reference voltage a first frequency modulation resistor, a second frequency modulation resistor and a third frequency modulation resistor, wherein the resistors are connected in series, wherein the first frequency modulation resistor is connected to the PWM control device; a switch connected to the first reference voltage circuit; a second bypass switch connected to the second reference voltage circuit; wherein the two ends of the second frequency modulation resistor are respectively connected to the first bypass switch and the second bypass The switch, the bypass switch may be a semiconductor component. S] 5 201238227 [Embodiment] The present invention is capable of realizing a versatile power supply by adjusting the width control of the surface width (hereinafter referred to as the sequence control relay) 2〇9 When the (four) is in the light cake can degrade the energy, #贞 load overload output can increase the frequency to increase the power output to stabilize the load. 2 is a circuit diagram of an embodiment of an exchange power supply with a variable frequency device of the present invention. The switching power supply of Fig. 2 is composed of a rectifying device 2〇1, a transformer T1, an output circuit 205, a switching device 203, a pulse width modulation control device 2〇9, a feedback circuit 207, and a variable frequency modulation device. The variable frequency modulation device is connected to the feedback circuit 207 and the PWM control device 209, respectively.

The dotted line block of FIG. 2 represents the basic structure of the variable frequency modulation device proposed by the present invention. The variable frequency modulation device is composed of a first frequency modulation resistor Rtl, a second frequency modulation resistor Rt2, a third frequency modulation resistor Rt3, and a first side. The switch 5U, the second bypass switch Qt2, the first reference voltage circuit, and the second reference voltage circuit are formed. The first reference voltage circuit has a voltage stabilizing diode zi, a voltage stabilizing capacitor ctl and a triggering resistor 玢丨, and the stabilizing diode Z1 series voltage stabilizing capacitor Ctb the stabilizing capacitor Ctl parallel triggering resistor; The second reference voltage circuit has a voltage stabilizing diode Z2, a stabilizing capacitor Ct2 and a triggering resistor core 2, and the stabilizing diode Z2 is connected in series with a stabilizing capacitor Ct2, and the stabilizing capacitor Ct2 is connected in parallel to trigger the resistor. The first frequency modulation resistor Rtl of the variable frequency modulation circuit is connected to the frequency adjustment input terminal RT of the pWM control device 2〇9, and the other end is grounded; one end of the second frequency modulation resistor Rt2 is connected to the PWM control device. The frequency adjustment input terminal RT of 209 is connected to the first bypass switch QU at the other end; and one end of the third frequency modulation resistor Rt3 is connected to the frequency adjustment input terminal of the pwM 201238227 control device 209, and the other end is connected to the second bypass. Switch Qt2. The feedback circuit 207 is connected to the feedback control signal terminal c〇MP of the PWM control device 2〇9 for extracting the feedback signal transmitted from the output terminal by the feedback circuit 207. The first reference voltage circuit and the second reference voltage circuit are respectively connected to the feedback control signal terminal COMP through the voltage stabilizing diodes Z1 and Z2 to receive the output signal of the output terminal. The first bypass switch Qtl is connected to one end of the trigger resistor Rrl, and the second bypass switch (^2 is connected to one end of the trigger resistor 2). When the load connected to the switching power supply is at a normal full load (Full L〇rd), The feedback control signal terminal c〇MP potential fed back to the PWM controller 209 by the feedback circuit 207 causes the voltage regulator body Z2 to collapse, and the trigger resistor and the voltage stabilizing capacitor Q2 are charged to turn on the bypass switch Qt2. The external equivalent impedance of the frequency adjustment input terminal rt of the pwm control device 209 is formed by the second bypass switch Qt2 being turned on to form a first frequency adjustment resistor RU in parallel with the third frequency adjustment resistor Rt3, and the output switching of the PWM control device 2〇9 is set. The frequency is a general set value (about 60 kHz to 70 kHz). § When the load connected to the parent-type power supply is at a light load, the control device 209 feedback control signal terminal COMP potential is lower than a predetermined value, which is insufficient for the voltage regulator The body Z1 and Z2 collapse, so the bypass switch Qt2 does not operate. The external equivalent impedance of the PWM control device 2〇9 frequency adjustment input terminal RT is Rtl. It can be seen from the following formula (M) that the frequency adjustment input terminal RT is externally connected. The greater the equivalent impedance, The lower the turn-off switching frequency, the lower the switching frequency, which can reduce the power consumption of the switched power supply and achieve energy saving. (Μ) P〇=\XLPXl>Fs, P〇 : Output power 201238227

Lp : The inductance in the transformer primary side

Ip : Primary peak current

Fsw : PWM controller frequency When the load connected to the switching power supply is at the peak load (Peak Lord),

The feedback control signal terminal COMP potential fed back to the PWM control device 209 by the feedback circuit 207 causes the voltage stabilizing diodes Z1 and Z2 to collapse, the voltage stabilizing capacitors CU and Ct2 are charged, and the switching switches QU and Qt2 are turned on. The external equivalent impedance of the PWM control device 2〇9 frequency adjustment input lamp is formed by the first bypass switch QU and the second bypass switch to form a first frequency adjustment resistor RU, a second frequency adjustment resistor Rt2 and a third frequency adjustment. resistance

Rt3 is connected in parallel. It can be seen from the above formula (M) that the smaller the external equivalent impedance of the fresh input terminal RT is, the higher the output is, the higher the output is. When the switching of the pwM controlled forging is fresh, the output power can be increased. 3 is a circuit diagram of another embodiment of an exchange power supply with a variable frequency device of the present invention. The dotted line block of FIG. 3 represents the basic structure of the variable frequency modulation control circuit proposed by the present invention. The variable frequency modulation control circuit is composed of a first frequency modulation resistor Rt, a frequency modulation resistor Rt2, a third frequency variable, and a resistance Rt3. - a bypass switch QU, a bypass switch Qt2, a first reference voltage circuit, and a second reference voltage circuit. Wherein, the reference voltage has a surface two-layer Z-b voltage regulator capacitance αι and a trigger resistor and a voltage regulator-pole body Ζ1 series voltage stabilizing capacitor Ql, the voltage stabilizing capacitor cu parallel trigger resistor Rrl 'the second reference voltage circuit has a surface two Polar body ☆ voltage regulator capacitor (3) and trigger resistor Rr2 'and voltage regulator diode Z2 series voltage regulator capacitor a?, the surface capacitor 8 201238227

Ct2 parallel trigger resistor Rr2. The first frequency modulation resistor of the variable frequency modulation circuit is connected in series with the second frequency modulation resistor Rt2 and the third frequency modulation resistor Rt3. The end of the first frequency adjustment resistor Rtl is connected to the frequency adjustment input RT of the PWM control unit 3〇9. The terminal of the second frequency adjusting resistor Rt2 is grounded, and the two ends of the third frequency adjusting resistor (10) are respectively connected to the first frequency adjusting resistor Rtl and the second frequency adjusting resistor. The end of the third frequency adjusting resistor Rt3 is connected to the second bypass switch Qt2, and the other end is connected to the first bypass switch Qtl. The feedback circuit 307 is connected to the feedback control signal terminal COMP of the PWM control device 3〇9 for finely relaying the feedback signal transmitted from the output terminal of the circuit 307. The first reference voltage circuit and the second reference voltage circuit are respectively connected to the feedback control signal terminal COMP by the domain voltage diodes 21 and 22 to receive the output signal of the output terminal. The first bypass switch is connected to one end of the trigger resistor Rr1, and the second bypass switch Qt2 is connected to one end of the trigger resistor. When the load connected to the switching power supply is at normal full load (Full L〇rd), the feedback control signal terminal c〇Mp potential fed back to the PWM (four) 309 by the feedback circuit 307 causes the voltage regulator diode Z1 Crash, at this time, the trigger resistor is continuously charged and the voltage regulator capacitor cti is continuously charged and the first bypass switch Qtl is turned on. The PWM control device 2 (8) frequency adjustment input terminal RT (10) is connected to the equivalent impedance due to the conduction of the first bypass switch qU. The adjustment resistor Rtl is connected in series with Rt3, and then the output switching frequency of the PWM controller 309 is set to a general set value (about 60 kHz to 70 kHz). When the load connected to the switching power supply is at light load, the feedback control signal terminal COMP potential of the pWM control device 309 is lower than the set value, which is insufficient for the voltage regulator diodes Z1 and Z2 to collapse. The switch QU and the second bypass switch will not operate, [9 201238227 PWM control device 3〇9 frequency adjustment input terminal RT (10) is connected to the equivalent impedance $ first frequency adjustment resistor, such as, the second frequency adjustment resistor is off the third frequency Adjusting the resistance series, it can be seen from the above formula (1-1) that the larger the equivalent impedance of the RT-connected input terminal, the lower the output switching frequency, and the lower the output voltage can reduce the power consumption on the wire. In turn, the efficiency is improved and the effect of the boots is achieved. When the exchange power supply is connected to the Peak Lord, the feedback control signal terminal (7) of the PWM control device will be raised by the feedback circuit 3〇7, and the tearing potential will rise to stabilize the ami and Z2. , the voltage regulator capacitor α ct2 charging, and the bypass switch QU, the first-bypass switch such as conduction, and the p-control device Qing frequency adjustment input terminal RT external material effect impedance __ bypass drama (8), the first The second bypass switch Qt2 is turned on to form a first-frequency adjustment resistor. For example, as shown in the above formula, the smaller the external equivalent impedance of the RT is, the higher the switching frequency is, and the switching of the PWM control device 309 is increased. , solution, axis drive ability. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional switched power supply; FIG. 2 is a circuit diagram of a switched power supply according to an embodiment of the present invention; FIG. 3 is an implementation in accordance with the present invention; Example of a switching power supply circuit diagram.

[Main component symbol description] Rectifier transformer switch device output circuit feedback circuit pulse width modulation control device first frequency modulation resistor second frequency modulation resistor third frequency modulation resistor first bypass switch second bypass switch Regulated voltage regulator capacitor trigger resistor frequency adjustment input feedback control signal terminal 11, 201, 301 T1 13, 203, 303 15 ' 205'305 17, 207, 307 19, 209, 309 Rtl Rt2 Rt3 Qtl Qt2 Z1 ' Z2 Ctl ' Ct2 Rrl vRr2 RT COMP

Claims (1)

201238227 VII. Patent application scope: 1. A power supply device with a frequency conversion device, comprising: a rectifying device 'for rectifying an alternating current power source into a direct current power source; and a transformer device for transmitting the rectified device through the rectifying device a DC power source is transmitted from the primary winding of the transformer device to the secondary winding; an output circuit for outputting the DC power of the secondary winding to the load device; a switching device 'connected to the primary winding a pulse width modulation control device connected to the switching device; a feedback circuit having one end coupled to the output circuit and the other end coupled to the pulse width modulation control device; The switching frequency of the modulation pulse width modulation control device comprises: a first frequency modulation resistor connected to the pulse width modulation control device; a first reference voltage circuit and a second reference voltage circuit, respectively Connected to the pulse width modulation control device; a second frequency modulation resistor connected across the pulse width modulation control device and a first a third frequency modulation resistor, connected between the pulse width modulation control device and a second bypass switch; wherein the first bypass switch is connected to the first reference voltage circuit; The second bypass switch is connected to the second reference voltage circuit. The power supply device of claim 1, wherein the first reference voltage circuit and the second reference voltage circuit are respectively configured to receive a feedback signal of the feedback circuit, the first reference voltage circuit and The first reference voltage circuit includes a voltage stabilizing diode connected to a voltage stabilizing capacitor, and the voltage stabilizing capacitor is connected to a trigger resistor. 3' The power supply of claim 1, wherein the bypass switch is a semiconductor component. 4. A power supply having a frequency conversion device, comprising: - a rectifier device for rectifying an alternating current power source into a direct current power source; - a transformer device for transmitting a direct current power source rectified by the rectifier device, Pressing 12 201238227, the primary winding is transmitted to the secondary winding; an output circuit for outputting the DC power of the secondary winding to the load device; and a switching device connected to the transformer a side winding; a pulse width modulation control device connected to the switching device; a feedback circuit having one end coupled to the output circuit and the other end coupled to the pulse width modulation control device; & The switching frequency of the modulation pulse width modulation control device includes: a gossip first reference voltage circuit and a second reference voltage circuit; a first frequency modulation resistor, a second frequency modulation resistor And - the third frequency modulation resistor, the Z resistor series connection "where the first - fresh modulation transformer connection pulse width modulation control first bypass switch, connected to the first reference Dividing circuit; = second bypass switch connected to the second reference voltage circuit wherein both ends of the second frequency = Machine wealth resistor connected to the first points - off and fresh two bypass bypass opening.