Wave-loss boost control circuit

Abstract

The utility model provides a wave loss boost control circuit comprising an EM I filter circuit, a rectification voltage doubling circuit, a silicon controlled rectifier voltage regulation circuit, a zero cross detection circuit and an LLC control circuit. The input end of the EM I filter circuit is connected with an AC signal; the output end of the EM I filter circuit is connected with the input end of the rectification voltage doubling circuit; the rectification voltage doubling circuit is connected with the silicon controlled voltage regulation circuit. The zero cross detection circuit is connected with the output end of the EM I filter circuit, the input end AC-L of the rectification voltage doubling circuit and the AC zero volt point of the rectification voltage doubling circuit AC-N; the silicon controlled voltage regulation circuit is connected in parallel with the zero-cross detection circuit and the rectification voltage doubling circuit; and the LLC control circuit is connected in parallel with the silicon controlled voltage regulating circuit and the rectifying voltage doubling circuit, and the direct-current output end of the rectifying bridge outputs stable voltage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the steady voltage control signal transmission circuit technical field, concretely relates to a wave loss boost control circuit. BACKGROUND

[0002] The high -power power supply generally will adopt BOOST + LLC topology to realize, realizes wide voltage input and steady voltage output through two -stage circuit. Because LLC topology can realize MOS pipe's zero voltage conduction therefore efficiency will be higher than ordinary half -bridge and positive -going wave. But the input voltage range of LLC circuit generally will require between 380V-420V, because when input voltage is low, the excitation current of primary is very big, leads to transformer to heat seriously, even can not work normally, when input voltage is high, LLC's working frequency will become very high, leads to MOS pipe to heat seriously, even can damage. Therefore need to increase BOOST circuit to control input voltage, guarantees the stability of input voltage.

[0003] BOOST circuit needs to be constituted by control chip + boost inductor + MOS pipe + freewheeling diode, this way along with the increase of power supply power, the volume of boost inductor will become bigger, and then cost will become higher and higher, therefore, it is necessary to propose a wave loss boost control circuit to at least partially solve the problems in the prior art. CONTENT OF UTILITY MODEL

[0004] In order to at least partially solve the above problems, the utility model provides a wave loss boost control circuit, comprising:

[0005] EMI filter circuit, rectification voltage doubling circuit, thyristor voltage regulating circuit, zero -crossing detection circuit and LLC control circuit;

[0006] EMI filter circuit input end connects AC signal;EMI filter circuit output end connects rectification voltage doubling circuit input end;Rectification voltage doubling circuit connects thyristor voltage regulating circuit;Zero -crossing detection circuit connects EMI filter circuit output end and rectification voltage doubling circuit input end AC-L and rectification voltage doubling circuit AC-N AC zero volt point;Thyristor voltage regulating circuit is connected with zero -crossing detection circuit and rectification voltage doubling circuit;LLC control circuit is connected with thyristor voltage regulating circuit and rectification voltage doubling circuit rectification bridge DC output end and exports steady voltage.

[0007] Preferably, EMI filter circuit includes: F1 safety tube, CX1 capacitor, CX2 capacitor, LF1 inductor, CY1 capacitor and CY2 capacitor;

[0008] The other end of the F1 safety tube is connected with the one end of the CX1 capacitor and the one input end of the LF1 inductor; the other end of the CX1 capacitor is connected with the N AC input and the other input end of the LF1 inductor; the one output end of the LF1 inductor is connected with the one end of the CY1 capacitor and the one end of the CX2 capacitor; the other output end of the LF1 inductor is connected with the other end of the CX2 capacitor and the one end of the CY2 capacitor; the other end of the CY1 capacitor and the other end of the CY2 capacitor are connected with the ground respectively.

[0009] Preferably, the rectifier voltage doubling circuit comprises:

[0010] The BD1 rectifier bridge, the EC1 electrolytic capacitor and the EC2 electrolytic capacitor; the AC-L AC end of the BD1 rectifier bridge is connected with the one output end of the LF1 inductor; the AC-N AC end of the BD1 rectifier bridge is connected with the other output end of the LF1 inductor; the positive pole of the EC1 electrolytic capacitor is connected with the V+ output end of the BD1 rectifier bridge; the negative pole of the EC1 electrolytic capacitor is connected with the positive pole of the EC2 electrolytic capacitor and the other output end of the LF1 inductor; the negative pole of the EC2 electrolytic capacitor is connected with the SCR1 controllable silicon and the V- output end of the BD1 rectifier bridge.

[0011] Preferably, the controllable silicon voltage regulating circuit comprises:

[0012] The 2 pin of the U1 control chip is connected with the 2 pin of the photo-coupler IC1; the 6 pin of the U1 control chip is connected with the one end of the R4 and the one end of the R11; the other end of the R4 is connected with the one end of the R2; the 3 pin of the U1 control chip is connected with the one end of the RW1.

[0013] Preferably, the zero-crossing detection circuit comprises:

[0014] The one end of the U2 photo-coupler light emitting tube is connected with the AC-L; the other end of the U2 photo-coupler light emitting tube is connected with the one end of the R16 resistor; the other end of the R16 resistor is connected with the one end of the R17 resistor; the other end of the R17 resistor is connected with the positive pole of the D1 diode; the negative pole of the D1 diode is connected with the AC-N; the one end of the U2 photo-coupler light control tube is connected with the VCC1 power supply; the other end of the U2 photo-coupler light control tube is connected with the one end of the R14 resistor.

[0015] Preferably, the LLC control circuit comprises: the U4 control chip, the Q3 transistor, the Q2 transistor, the resonant inductor, the resonant capacitor and the excitation inductor, which form a resonant network; the U4 control chip controls the Q3 transistor and the Q2 transistor to be turned on and turned off to output a stabilized voltage.

[0016] The utility model discloses the beneficial effect:

[0017] The utility model discloses to the above -mentioned problem provides a small, low -cost boost control circuit, when receiving the signal of feedback voltage is low or high, IC will control thyristor in input positive wave zero point and close, let the wave shape of input voltage appear wave loss, thereby make electrolytic capacitor charging energy get control, under the wave loss of thyristor and capacitor voltage doubler circuit, the voltage of both ends voltage gets control, make reach controllable boost function. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, explain the utility model with the embodiments of the utility model, and do not constitute the limit to the utility model. In the drawings:

[0019] Fig. 1 It is an embodiment figure for the wave loss boost control circuit structure of the utility model;

[0020] Fig. 2 It is an embodiment figure for the wave loss boost control circuit connection of the utility model;

[0021] Fig. 3 It is an embodiment figure for the wave loss boost control circuit control wave of the utility model. SPECIFIC EMBODIMENT

[0022] The preferred embodiments of the utility model are explained below in combination with the drawings, and it should be understood that the preferred embodiments described here are only for explaining and explaining the utility model, and are not for limiting the utility model.

[0023] As Figs. 1-3 The utility model provides a wave loss boost control circuit, comprising: EMI filter circuit, rectification voltage doubler circuit, thyristor voltage regulating circuit, zero -cross detection circuit and LLC control circuit;

[0024] EMI filter circuit input end connects AC signal;EMI filter circuit output end connects rectification voltage doubler circuit input end;Rectification voltage doubler circuit connects thyristor voltage regulating circuit;Zero -cross detection circuit connects EMI filter circuit output end and rectification voltage doubler circuit input end AC-L and rectification voltage doubler circuit AC-N AC zero volt point;Thyristor voltage regulating circuit and zero -cross detection circuit and rectification voltage doubler circuit;LLC control circuit and thyristor voltage regulating circuit and rectification voltage doubler circuit rectifier bridge DC output end output voltage stabilizer.

[0025] The principle and effect of the above technical solution are: the EMI filter circuit input end is connected with an alternating current signal; the EMI filter circuit output end is connected with the rectifier voltage doubling circuit input end; the rectifier voltage doubling circuit is connected with the silicon controlled voltage regulating circuit; the zero-crossing detection circuit is connected with the EMI filter circuit output end and the rectifier voltage doubling circuit input end AC-L and rectifier voltage doubling circuit AC-N alternating current zero voltage point; the silicon controlled voltage regulating circuit is connected with the zero-crossing detection circuit and the rectifier voltage doubling circuit; the LLC control circuit is connected with the silicon controlled voltage regulating circuit and the rectifier voltage doubling circuit rectifier bridge direct current output end, and outputs a stabilized voltage; and a small-size and low-cost boost control mode is provided. When receiving a signal of a feedback voltage that is low or high, the IC controls the silicon controlled silicon to be turned on and off at the input positive wave zero point, so that the input voltage waveform appears to lose waves, thereby controlling the charging energy of the electrolytic capacitor, and under the silicon controlled wave loss and capacitor voltage doubling circuit, the voltage between the two ends of the voltage is controlled, so that the function of controllable boost is achieved.

[0026] In one embodiment, the EMI filter circuit comprises: F1 fuse, CX1 capacitor, CX2 capacitor, LF1 inductor, CY1 capacitor and CY2 capacitor.

[0027] The F1 fuse is connected with the other end of the L alternating current input, and is connected with one end of the CX1 capacitor and one input end of the LF1 inductor; the other end of the CX1 capacitor is connected with the N alternating current input and the other input end of the LF1 inductor; one output end of the LF1 inductor is connected with one end of the CY1 capacitor and one end of the CX2 capacitor; the other output end of the LF1 inductor is connected with the other end of the CX2 capacitor and one end of the CY2 capacitor; the other end of the CY1 capacitor and the other end of the CY2 capacitor are respectively grounded.

[0028] The principle and effect of the above technical solution are: in the EMI filter circuit, the F1 fuse in the EMI filter circuit is connected with the other end of the L alternating current input, and is connected with one end of the CX1 capacitor and one input end of the LF1 inductor; the other end of the CX1 capacitor is connected with the N alternating current input and the other input end of the LF1 inductor; one output end of the LF1 inductor is connected with one end of the CY1 capacitor and one end of the CX2 capacitor; the other output end of the LF1 inductor is connected with the other end of the CX2 capacitor and one end of the CY2 capacitor; the other end of the CY1 capacitor and the other end of the CY2 capacitor are respectively grounded; when input power is applied, the alternating current passes through the F1 fuse, and is filtered and interference-processed by the CX1, CX2, LF1, CY1 and CY2.

[0029] In one embodiment, the rectifier voltage doubling circuit comprises:

[0030] BD1 rectifier bridge, EC1 electrolytic capacitor and EC2 electrolytic capacitor; the AC-L end of the BD1 rectifier bridge is connected to one output end of the LF1 inductor; the AC-N end of the BD1 rectifier bridge is connected to another output end of the LF1 inductor; the positive pole of the EC1 electrolytic capacitor is connected to the V+ output end of the BD1 rectifier bridge; the negative pole of the EC1 electrolytic capacitor is connected to the positive pole of the EC2 electrolytic capacitor and another output end of the LF1 inductor; the negative pole of the EC2 electrolytic capacitor is connected to the SCR1 thyristor and the V- output end of the BD1 rectifier bridge.

[0031] The principle and effect of the above technical solution are as follows: the rectifier voltage doubling circuit comprises: a BD1 rectifier bridge, an EC1 electrolytic capacitor and an EC2 electrolytic capacitor; the AC-L end of the BD1 rectifier bridge is connected to one output end of the LF1 inductor; the AC-N end of the BD1 rectifier bridge is connected to another output end of the LF1 inductor; the positive pole of the EC1 electrolytic capacitor is connected to the V+ output end of the BD1 rectifier bridge; the negative pole of the EC1 electrolytic capacitor is connected to the positive pole of the EC2 electrolytic capacitor and another output end of the LF1 inductor; the negative pole of the EC2 electrolytic capacitor is connected to the SCR1 thyristor and the V- output end of the BD1 rectifier bridge; when the L line of the alternating current is a positive half cycle and the N line is a negative half cycle, the L line is rectified through the rectifier bridge, flows out from the positive pole of the rectifier bridge, flows to the positive pole of the EC1, then flows out from the negative pole of the EC1 to the SCR1 thyristor, and finally returns to the N line to charge the EC1 to store energy, and the EC1 voltage is equal to the input voltage multiplied by 1.414; when the N line of the alternating current is a positive half cycle and the L line is a negative half cycle, the N line flows to the positive pole of the EC2 through the SCR1, then flows to the negative pole of the EC2, and finally returns to the L line through the diode of the rectifier bridge to charge the EC2 to store energy, and the EC2 voltage is equal to the input voltage multiplied by 1.414; at this time, since the EC1 and the EC2 are in series, the HV voltage is equal to the sum of the EC1 voltage and the EC2 voltage, that is, equal to the input voltage multiplied by 1.414 multiplied by 2.

[0032] In one embodiment, the thyristor voltage regulating circuit comprises:

[0033] The 2 pin of the U1 control chip is connected to the 2 pin of the optocoupler IC1 control; the 6 pin of the U1 control chip is connected to the voltage feedback pin, one end of the R4 and one end of the R11; the other end of the R4 is connected to one end of the R2; the 3 pin of the U1 control chip is connected to the current detection pin of the RW1.

[0034] The principle and effect of the above technical solution are: the silicon controlled voltage regulating circuit comprises: the 2-pin of U1 control chip is connected with the 2-pin of photo-coupler IC1 control; the 6-pin of U1 control chip is connected with the one end of R4 and the one end of R11; the other end of R4 is connected with the one end of R2; the 3-pin of U1 control chip is connected with the one end of RW1; the silicon controlled voltage regulating circuit: since the rectifier voltage doubling circuit cannot freely control the voltage, the third part of circuit is added. The 2-pin of U1 sends a driving signal to the photo-coupler IC1 control to control the turn-on and turn-off of the silicon controlled rectifier, and controls the voltage doubling charging period of the rectifier voltage doubling circuit, so that the charging voltage of the capacitor is reduced to achieve the purpose of controlling the voltage. The 6-pin of U1 is a voltage feedback pin, which detects the real-time feedback signal of HV voltage through the voltage division of R2, R4 and R11, so as to adjust the turn-on and turn-off of the silicon controlled rectifier to control the voltage doubling charging period of the rectifier voltage doubling circuit to achieve the purpose of closed-loop voltage control. The 3-pin of U1 is a current detection pin, which detects the potential of RW1 to limit the current flowing through SCR1, thereby achieving the functions of overload and short circuit protection.

[0035] In one embodiment, the zero-crossing detection circuit comprises:

[0036] The one end of the light emitting tube of U2 photo-coupler is connected with AC-L; the other end of the light emitting tube of U2 photo-coupler is connected with the one end of R16 resistor, and the other end of R16 resistor is connected with the one end of R17 resistor; the other end of R17 resistor is connected with the anode of D1 diode; the cathode of D1 diode is connected with AC-N; the one end of the light control tube of U2 photo-coupler is connected with VCC1 power supply; and the other end of the light control tube of U2 photo-coupler is connected with the one end of R14 resistor.

[0037] The principle and effect of the above technical solution are: the zero-crossing detection circuit comprises: the one end of the light emitting tube of U2 photo-coupler is connected with AC-L; the other end of the light emitting tube of U2 photo-coupler is connected with the one end of R16 resistor, and the other end of R16 resistor is connected with the one end of R17 resistor; the other end of R17 resistor is connected with the anode of D1 diode; the cathode of D1 diode is connected with AC-N; the one end of the light control tube of U2 photo-coupler is connected with VCC1 power supply; and the other end of the light control tube of U2 photo-coupler is connected with the one end of R14 resistor; the zero-crossing detection circuit: since the silicon controlled rectifier will generate a large switching loss when it is turned on at the non-positive half-wave zero point, the fourth part of zero-crossing detection circuit is added to detect the junction of the positive half cycle and the negative half cycle of the alternating current, that is, the place of zero voltage of the alternating current. The positive half cycle of the alternating current can flow through U2 to R16, R17 and D1, at this time the photo-coupler U2 is turned on, VCC1 passes through the photo-coupler U2 and R14 to reach the 1-pin of U1, and a zero-crossing point signal is obtained, so that the turn-on and turn-off of the silicon controlled rectifier are controlled at the zero point position, greatly reducing the switching loss of the silicon controlled rectifier.

[0038] In one embodiment, the LLC control circuit comprises: U4 control chip, Q3 transistor, Q2 transistor, resonant inductance, resonant capacitance and excitation inductance, which constitute a resonant network; the turn-on and turn-off of the Q3 transistor and Q2 transistor are controlled by the U4 control chip to output stable voltage.

[0039] The principle and effect of the technical scheme are as follows: the LLC control circuit comprises a U4 control chip, a Q3 transistor, a Q2 transistor, a resonant inductor, a resonant capacitor and a field inductor to form a resonant network; the U4 control chip is used to control the opening and closing of the Q3 transistor and the Q2 transistor to output a stable voltage; the LLC control circuit: the resonant network is formed by the resonant inductor, the resonant capacitor and the field inductor in the LCC circuit, and the U4 control chip is used to control the opening and closing of the Q3 transistor and the Q4 transistor to achieve the purpose of outputting a stable voltage.

[0040] The utility model only improves the hardware structure of the system, and the method and software program involved in the operation process of the system can be designed by the person skilled in the art according to the principle and function of the utility model combined with the prior art, and the technical scheme of the utility model does not improve any method or software program.

[0041] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model claims and equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. A wave-sink boost control circuit, characterized by, Comprise: EMI filter circuit, rectifier voltage doubling circuit, silicon controlled voltage regulating circuit, zero-crossing detection circuit and LLC control circuit; EMI filter circuit input end connects AC signal; EMI filter circuit output end connects rectifier voltage doubling circuit input end; Rectifier voltage doubling circuit connects silicon controlled voltage regulating circuit; Zero-crossing detection circuit connects EMI filter circuit output end and rectifier voltage doubling circuit input end AC-L and rectifier voltage doubling circuit AC-N AC zero voltage point; Silicon controlled voltage regulating circuit is connected with zero-crossing detection circuit and rectifier voltage doubling circuit; LLC control circuit is connected with silicon controlled voltage regulating circuit and rectifier voltage doubling circuit rectifier bridge DC output end and outputs stabilized voltage.

2. A wavelet boost control circuit according to claim 1, wherein EMI filter circuit includes: F1 fuse, CX1 capacitor, CX2 capacitor, LF1 inductor, CY1 capacitor and CY2 capacitor; F1 fuse connects L AC input other end and connects CX1 capacitor one end and LF1 inductor one input end; CX1 capacitor other end connects N AC input and LF1 inductor other input end; LF1 inductor one output end connects CY1 capacitor one end and CX2 capacitor one end; LF1 inductor other output end connects CX2 capacitor other end and CY2 capacitor one end; CY1 capacitor other end and CY2 capacitor other end are grounded respectively.

3. A wavelet boost control circuit according to claim 1, wherein Rectifier voltage doubling circuit includes: BD1 rectifier bridge, EC1 electrolytic capacitor and EC2 electrolytic capacitor; BD1 rectifier bridge AC-L AC end connects LF1 inductor one output end; BD1 rectifier bridge AC-N AC end connects LF1 inductor other output end; EC1 electrolytic capacitor positive pole connects BD1 rectifier bridge V+ output end; EC1 electrolytic capacitor negative pole connects EC2 electrolytic capacitor positive pole and LF1 inductor other output end; EC2 electrolytic capacitor negative pole connects SCR1 silicon controlled rectifier, BD1 rectifier bridge V- output end.

4. The wavelet drop boost control circuit of claim 1, wherein, Silicon controlled voltage regulating circuit includes: U1 control chip 2 pin connects optocoupler IC1 control 2 pin; U1 control chip 6 pin voltage feedback pin connects R4 one end and R11 one end; R4 other end connects R2 one end; U1 control chip 3 pin current detection pin connects RW1 one end.

5. The wavelet drop boost control circuit of claim 1, wherein, Zero-crossing detection circuit includes: U2 optocoupler light emitting tube one end connects AC-L; U2 optocoupler light emitting tube other end connects R16 resistor one end, R16 resistor other end connects R17 resistor one end; R17 resistor other end connects D1 diode positive pole; D1 diode negative pole connects AC-N; U2 optocoupler light control tube one end connects VCC1 power supply; U2 optocoupler light control tube other end connects R14 resistor one end.

6. A wavelet boost control circuit according to claim 1, wherein LLC control circuit includes: U4 control chip, Q3 transistor, Q2 transistor, resonant inductor, resonant capacitor, excitation inductor, constitute resonant network; Through U4 control chip control connects Q3 transistor and Q2 transistor open and close output stabilized voltage.

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