Switching tube driving signal circuit for high-frequency bridgeless rectifying circuit and rectifying method
阅读说明：本技术 用于高频无桥整流电路的开关管驱动信号电路及整流方法 (Switching tube driving signal circuit for high-frequency bridgeless rectifying circuit and rectifying method ) 是由 钱科军 李亚飞 郑众 谢鹰 周磊 刘乙 朱超群 李昊泽 谭林林 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种用于高频无桥整流电路的开关管驱动信号电路及整流方法,该电路包括积分电路、退饱和电路、交流同步PWM调制电路。所述退饱和电路用于在交流电流采样信号过零时为积分电路复位；所述交流同步PWM调制电路用于将积分电路的输出与输入的调制波信号进行调制；所述交流同步PWM调制电路共有两路输入信号,分别是交流采样信号和调制波信号；所述交流同步PWM调制电路共有两路输出信号,是两路对称的开关管驱动信号。本发明的电路能够实现高频无桥整流电路的同步驱动控制功能,通过调节调制波信号,就能对高频无桥整流电路的输出电流进行控制。(The invention discloses a switching tube driving signal circuit for a high-frequency bridgeless rectifying circuit and a rectifying method. The desaturation circuit is used for resetting the integration circuit when the alternating current sampling signal passes through zero; the alternating current synchronous PWM modulation circuit is used for modulating the output of the integrating circuit and the input modulation wave signal; the alternating current synchronous PWM modulation circuit has two input signals which are an alternating current sampling signal and a modulation wave signal respectively; the alternating current synchronous PWM circuit has two output signals which are two symmetrical switch tube driving signals. The circuit can realize the synchronous drive control function of the high-frequency bridgeless rectification circuit, and can control the output current of the high-frequency bridgeless rectification circuit by adjusting the modulation wave signal.)
1. The utility model provides a switch tube drive signal circuit for high frequency does not have bridge rectifier circuit which characterized in that: the circuit comprises a desaturation circuit, an integrating circuit and an alternating current synchronous PWM modulation circuit which are connected in sequence; the desaturation circuit is used for resetting the integration circuit when the alternating current sampling signal passes through zero; the alternating current synchronous PWM modulation circuit is used for modulating the output of the integrating circuit and the input modulation wave signal; the alternating current synchronous PWM modulation circuit has two input signals which are an alternating current sampling signal and a modulation wave signal respectively; the alternating current synchronous PWM circuit has two output signals which are two symmetrical switch tube driving signals.
2. The switching tube driving signal circuit for the high-frequency bridgeless rectification circuit according to claim 1, characterized in that: the high-frequency bridgeless rectifying circuit comprises a power supply V2, a diode D1, a diode D2, a switching tube S3, a switching tube S4, a filter capacitor C5 and a load resistor R18; the D1, D2, S3 and S4 are connected in a full-bridge structure and are connected with the C5 and the R18 in parallel; the power supply V2 is an alternating current source, or a circuit having alternating current source characteristics, which is equivalent to an alternating current source.
3. The switching tube driving signal circuit for the high-frequency bridgeless rectification circuit according to claim 1, characterized in that: the integrating circuit comprises operational amplifiers U3 and U4, resistors R1, R2, R3, R4, R6, R7, R8 and R9, and capacitors C1 and C2; the in-phase end of the U3 is grounded through R1, and the reverse-phase end of the U3 is connected with the positive pole of a power supply through R3; the R2 is connected with the in-phase end and the output end of the U3, and the R4 is connected with the inverting end and the output end of the U3; the C1 is connected with the inverting terminal of the U3 and the negative pole of the power supply; the in-phase end of the U4 is grounded through R6, and the reverse-phase end of the U4 is connected with the positive pole of a power supply through R8; the R7 is connected with the in-phase end and the output end of the U4, and the R9 is connected with the inverting end and the output end of the U4; the C2 is connected with the inverting terminal of the U4 and the negative pole of the power supply.
4. The switching tube driving signal circuit for the high frequency bridgeless rectification circuit according to claim 3, characterized in that: the desaturation circuit comprises a resistor R18, a comparator chip U8, 17 inverters, an AND gate chip U1, a NOR gate chip U2, a switching tube S1, a current-limiting resistor R5, a switching tube S2 and a current-limiting resistor R10; the R18 is connected with the in-phase end of U8; the inverting terminal of the U8 is grounded; the 17 inverters are sequentially connected in series; the output end of the U8 is connected with the head end of the 17 inverters after being connected in series; the input end of the U1 is respectively connected with the head end and the tail end of the 17 inverters after being connected in series; the input end of the U2 is respectively connected with the first section and the tail end of the 17 inverters after being connected in series; the output end of the U1 is connected with the gate of the S1; the drain electrode of the S1 is connected with the series R5 and the inverting terminal of an operational amplifier U3 in the integrating circuit, and the source electrode of the S1 is connected with the negative pole of a power supply; the output end of the U2 is connected with the gate of the S2; the drain electrode of the S2 is connected with the series R10 and the inverting terminal of the operational amplifier U4 in the integrating circuit, and the source electrode of the S2 is connected with the negative pole of the power supply.
5. The switching tube driving signal circuit for the high frequency bridgeless rectification circuit according to claim 3, characterized in that: the alternating current synchronous PWM modulation circuit comprises an operational amplifier U5, comparators U6 and U7, resistors R11, R12, R13, R14, R15, R16 and R17; the in-phase end of the U5 is connected with R13, and the reverse-phase end of the U5 is connected with R14 in series and connected with the negative electrode of a power supply; the R15 is connected with the in-phase end and the anti-phase end of the U5; the in-phase end series R11 of the U6 is connected with the output end of an operational amplifier U3 in the integrating circuit, and the reverse-phase end series R16 of the U6 is connected with the output end of the U5; the in-phase end series R17 of the U7 is connected with the output end of an operational amplifier U4 in the integrating circuit, and the reverse-phase end series R17 of the U7 is connected with the output end of the U5.
6. The switching tube driving signal circuit for the high-frequency bridgeless rectification circuit according to claim 4, characterized in that: the alternating current sampling signal is applied between the resistor R18 and the negative pole of the power supply in the form of a voltage signal.
7. The switching tube driving signal circuit for the high-frequency bridgeless rectification circuit according to claim 5, characterized in that: the modulated wave signal is applied between the R13 and the negative electrode of the power supply in the form of a voltage signal.
8. The switching tube drive signal circuit for a high-frequency bridgeless rectification circuit according to any one of claims 1 to 7, characterized in that: all active devices in the switching tube driving signal circuit for generating the high-frequency bridgeless rectifying circuit share one power supply V1, and the switching tube driving signal circuit comprises U3 and U4 in the integrating circuit, U8 and 17 inverters, U1 and U2 in the desaturation circuit, and U5, U6 and U7 in the alternating current synchronous PWM modulating circuit.
9. The switching tube driving signal circuit for the high frequency bridgeless rectification circuit according to claim 3, characterized in that: the resistances of the resistors R1, R2, R3, R4, R6, R7, R8 and R9 are all equal, and the models of the resistors U3 and U4 are the same.
10. A method of rectifying in a high frequency bridgeless rectifier circuit using the circuit of any of claims 1-9, characterized by: the method comprises the following steps:
(1) in the desaturation circuit, an alternating current sampling signal is input from the non-inverting terminal of U8, the period of the sampling signal is represented by T, U8 is used for carrying out zero-crossing comparison on the sampling signal, and a zero-crossing comparison signal is output; the subsequent 17 inverters form a delay inverter; the zero-cross comparison signal and the output signal of the time-delay inverter are connected with two input ends of U1, U1 outputs a short pulse at the rising edge of the zero-cross comparison signal, S1 is conducted under the action of the short pulse, C1 discharges through a loop formed by R5 and S1, and U is dischargedc1Becomes zero; the zero-cross comparison signal and the output signal of the time-delay inverter are connected with two input ends of U2, U2 outputs a short pulse at the falling edge of the zero-cross comparison signal, S2 is conducted under the action of the short pulse, C2 discharges through a loop formed by R10 and S2, and U is dischargedc2Becomes zero；
(2) The resistances of the integrating circuits R1, R2, R3, R4, R6, R7, R8 and R9 are all equal, represented by R, the capacitances of the capacitors C1 and C2 are equal, represented by C, and the power supply voltage is represented by uVccThat means, the output voltages of U3 and U4 are:
ucmaximum not exceeding the supply voltage uVccUnder the action of a desaturation circuit, when the formula (2) is satisfied, ucPresenting a sawtooth wave;
(3) u5, R13, R14 and R15 in the AC synchronous PWM modulation circuit form a voltage follower, U6, R11 and R16 form a comparator, and U7, R12 and R17 form a comparator; when the modulated wave signal is input from the non-inverting terminal of U5 and is denoted by D, the output voltage of U5 is:
u6 pairs Uc1And uU5Comparing and outputting a signal PWM 1; u7 pairs Uc2And uU5For comparison, the duty cycles of the output signals PWM2, PWM1, and PWM2 are equal, denoted by d, and d:
(4) rectifying the high-frequency bridgeless rectifying circuit, i for the current before rectificationsIs represented by the following general formula isComprises the following steps:
in the formula IsIs isThe amplitude of (a) of (b) is,is the initial phase;
the output current of the rectifier circuit is:
Technical Field
The invention belongs to the technical field of circuit conversion, and particularly relates to a switching tube driving signal circuit for a high-frequency bridgeless rectification circuit and a rectification method.
Background
Compared with the traditional PWM circuit scheme, the bridge-free topology has no diode rectifier bridge, and a pair of DC-DC circuits which complementarily work in the positive half period and the negative half period of alternating current are adopted to realize the functions of rectification and control at the same time. Although there are fewer devices connected in series in the current path of the bridgeless scheme, the control of the switching tube needs to be synchronized with the input high-frequency alternating current, so that the realization difficulty is high.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a switching tube driving signal circuit and a rectifying method for a high-frequency bridgeless rectifying circuit, which can realize accurate zero crossing point synchronization, and simultaneously design a desaturation circuit for an integrating circuit link to quickly reset the integrating circuit.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the switching tube driving signal circuit for the high-frequency bridgeless rectifying circuit comprises a desaturation circuit, an integrating circuit and an alternating current synchronous PWM (pulse width modulation) circuit which are sequentially connected; the desaturation circuit is used for resetting the integration circuit when the alternating current sampling signal passes through zero; the alternating current synchronous PWM modulation circuit is used for modulating the output of the integrating circuit and the input modulation wave signal; the alternating current synchronous PWM modulation circuit has two input signals which are an alternating current sampling signal and a modulation wave signal respectively; the alternating current synchronous PWM circuit has two output signals which are two symmetrical switch tube driving signals.
Further, the high-frequency bridgeless rectifying circuit comprises a power supply V2, a diode D1, a diode D2, a switching tube S3, a switching tube S4, a filter capacitor C5 and a load resistor R18; the D1, D2, S3 and S4 are connected in a full-bridge structure and are connected with the C5 and the R18 in parallel; the power supply V2 is an alternating current source, or a circuit having alternating current source characteristics, which is equivalent to an alternating current source.
Further, the integration circuit comprises operational amplifiers U3 and U4, resistors R1, R2, R3, R4, R6, R7, R8 and R9, and capacitors C1 and C2; the in-phase end of the U3 is grounded through R1, and the reverse-phase end of the U3 is connected with the positive pole of a power supply through R3; the R2 is connected with the in-phase end and the output end of the U3, and the R4 is connected with the inverting end and the output end of the U3; the C1 is connected with the inverting terminal of the U3 and the negative pole of the power supply; the in-phase end of the U4 is grounded through R6, and the reverse-phase end of the U4 is connected with the positive pole of a power supply through R8; the R7 is connected with the in-phase end and the output end of the U4, and the R9 is connected with the inverting end and the output end of the U4; the C2 is connected with the inverting terminal of the U4 and the negative pole of the power supply.
Further, the desaturation circuit comprises a resistor R18, a comparator chip U8, 17 inverters, an AND gate chip U1, a NOR gate chip U2, a switching tube S1, a current limiting resistor R5, a switching tube S2 and a current limiting resistor R10; the R18 is connected with the in-phase end of U8; the inverting terminal of the U8 is grounded; the 17 inverters are sequentially connected in series; the output end of the U8 is connected with the head end of the 17 inverters after being connected in series; the input end of the U1 is respectively connected with the head end and the tail end of the 17 inverters after being connected in series; the input end of the U2 is respectively connected with the first section and the tail end of the 17 inverters after being connected in series; the output end of the U1 is connected with the gate of the S1; the drain electrode of the S1 is connected with the series R5 and the inverting terminal of an operational amplifier U3 in the integrating circuit, and the source electrode of the S1 is connected with the negative pole of a power supply; the output end of the U2 is connected with the gate of the S2; the drain electrode of the S2 is connected with the series R10 and the inverting terminal of the operational amplifier U4 in the integrating circuit, and the source electrode of the S2 is connected with the negative pole of the power supply.
Further, the alternating current synchronous PWM modulation circuit comprises an operational amplifier U5, comparators U6 and U7, resistors R11, R12, R13, R14, R15, R16 and R17; the in-phase end of the U5 is connected with R13, and the reverse-phase end of the U5 is connected with R14 in series and connected with the negative electrode of a power supply; the R15 is connected with the in-phase end and the anti-phase end of the U5; the in-phase end series R11 of the U6 is connected with the output end of an operational amplifier U3 in the integrating circuit, and the reverse-phase end series R16 of the U6 is connected with the output end of the U5; the in-phase end series R17 of the U7 is connected with the output end of an operational amplifier U4 in the integrating circuit, and the reverse-phase end series R17 of the U7 is connected with the output end of the U5.
Further, the alternating current sampling signal is applied between the resistor R18 and the negative pole of the power supply in the form of a voltage signal.
Further, the modulated wave signal is applied between the R13 and the negative electrode of the power supply in the form of a voltage signal.
Further, all active devices in the switching tube driving signal circuit for generating the high-frequency bridgeless rectifying circuit share one power supply V1, and the switching tube driving signal circuit comprises U3 and U4 in the integrating circuit, U8 and 17 inverters, U1 and U2 in the desaturation circuit, and U5, U6 and U7 in the alternating current synchronous PWM modulating circuit.
Furthermore, the resistances of the resistors R1, R2, R3, R4, R6, R7, R8 and R9 are all equal, and the models of the resistors U3 and U4 are the same.
The rectification method of the high-frequency bridgeless rectification circuit by using the circuit comprises the following steps:
in the desaturation circuit, an alternating current sampling signal is input from the non-inverting terminal of U8, the period of the sampling signal is represented by T, U8 is used for carrying out zero-crossing comparison on the sampling signal, and a zero-crossing comparison signal is output; the subsequent 17 inverters form a delay inverter; comparing the zero-crossing comparison signal with the output signal of the delayed inverterThe two input ends of the U1 are connected, the U1 outputs a short pulse at the rising edge of the zero-crossing comparison signal, S1 is conducted under the action of the pulse, the C1 discharges through a loop formed by R5 and S1, and Uc1Becomes zero; the zero-cross comparison signal and the output signal of the time-delay inverter are connected with two input ends of U2, U2 outputs a short pulse at the falling edge of the zero-cross comparison signal, S2 is conducted under the action of the short pulse, C2 discharges through a loop formed by R10 and S2, and U is dischargedc2Becomes zero;
the resistances of the integrating circuits R1, R2, R3, R4, R6, R7, R8 and R9 are all equal, represented by R, the capacitances of the capacitors C1 and C2 are equal, represented by C, and the power supply voltage is represented by uVccThat means, the output voltages of U3 and U4 are:
ucmaximum not exceeding the supply voltage uVcc. Under the action of a desaturation circuit, when the formula (2) is satisfied, ucPresenting a sawtooth wave;
u5, R13, R14 and R15 in the AC synchronous PWM modulation circuit form a voltage follower, U6, R11 and R16 form a comparator, and U7, R12 and R17 form a comparator; when the modulated wave signal is input from the non-inverting terminal of U5 and is denoted by D, the output voltage of U5 is:
u6 pairs Uc1And uU5Comparing and outputting a signal PWM 1; u7 pairs Uc2And uU5The comparison is performed and the signal PWM2 is output. The duty cycles of PWM1 and PWM2 are equal, denoted by d, and d:
rectifying the high-frequency bridgeless rectifying circuit, i for the current before rectificationsIs represented by the following general formula isComprises the following steps:
in the formula IsIs isThe amplitude of (a) of (b) is,is the initial phase;
the output current of the rectifier circuit is:
the invention has the beneficial effects that:
the invention provides an alternating current synchronous PWM modulation method which can be used for a high-frequency bridgeless rectifying circuit of current source type input. The method can realize that the output current of the bridgeless rectifying circuit is controlled by one voltage; and synchronous rectification and zero current turn-off can be achieved. The method can realize the application of the bridgeless topology in the high-frequency rectifying circuit and can effectively improve the efficiency of the secondary side conversion circuit of the wireless power transmission system based on the bridgeless topology.
Drawings
FIG. 1 is a main circuit topology and control block diagram of a high frequency bridgeless rectifier circuit according to the present invention;
fig. 2 is a schematic diagram of the circuit of the present invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The switching tube driving signal circuit for the high-frequency bridgeless rectifying circuit in the embodiment is shown in fig. 1, and the circuit comprises a power supply V2, a diode D1, a diode D2, a switching tube S3, a switching tube S4, a filter capacitor C5 and a load resistor R18; the D1, D2, S3 and S4 are connected in a full-bridge structure and are connected with the C5 and the R18 in parallel; the power supply V2 is an alternating current source, or a circuit having alternating current source characteristics that can be equivalent to an alternating current source.
The ac synchronous PWM modulation circuit of the present invention is shown in fig. 2, and includes an integrating circuit, a desaturation circuit, and a PWM modulation circuit.
The working mode of the alternating current synchronous PWM modulation circuit is as follows:
(1) in the desaturation circuit, an alternating current sampling signal is input from the non-inverting terminal of U8, the period of the sampling signal is represented by T, U8 is used for carrying out zero-crossing comparison on the sampling signal, and a zero-crossing comparison signal is output; the subsequent 17 inverters form a delay inverter; the zero-cross comparison signal and the output signal of the time-delay inverter are connected with two input ends of U1, U1 outputs a short pulse at the rising edge of the zero-cross comparison signal, S1 is conducted under the action of the short pulse, C1 discharges through a loop formed by R5 and S1, and U is dischargedc1Becomes zero; the zero-cross comparison signal and the output signal of the time-delay inverter are connected with two input ends of U2, U2 outputs a short pulse at the falling edge of the zero-cross comparison signal, S2 is conducted under the action of the short pulse, C2 discharges through a loop formed by R10 and S2, and U is dischargedc2Becomes zero.
(2) The integration circuit shown in fig. 2 comprises two integrators with the same parameters, wherein the resistances of R1, R2, R3, R4, R6, R7, R8, R9 are all equal, denoted by R, the capacitances of capacitors C1, C2 are equal, denoted by C, and the supply voltage u is denoted by uVccThat means, the output voltages of U3 and U4 are:
ucmaximum not exceeding the supply voltage uVcc. Under the action of a desaturation circuit, when the formula (2) is satisfied, ucAppearing as a sawtooth wave.
(3) The PWM modulation circuit shown in fig. 2 includes a voltage follower composed of U5, R13, R14, and R15, a comparator composed of U6, R11, and R16, and a comparator composed of U7, R12, and R17. When the modulated wave signal is input from the non-inverting terminal of U5 and is denoted by D, the output voltage of U5 is:
u6 pairs Uc1And uU5Comparing and outputting a signal PWM 1; u7 pairs Uc2And uU5The comparison is performed and the signal PWM2 is output. The duty cycles of PWM1 and PWM2 are equal, denoted by d, and d:
the alternating current synchronous PWM modulation circuit is applied to the high-frequency bridgeless rectification circuit, and the current before rectification is used as isIs represented by the following general formula isComprises the following steps:
in the formula IsIs isThe amplitude of (a) of (b) is,is the initial phase.
The output current of the rectifier circuit is:
the above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.