Wide-range voltage-multiplying converter circuit and control method thereof

Abstract

The invention relates to a wide-range voltage-multiplying converter circuit and a control method thereof. The wide-range voltage-multiplying converter circuit comprises an inversion assembly, a resonance network, a transformer assembly, a full-bridge rectification assembly and a first filtering assembly, the secondary side of a transformer is connected with the input end of the full-bridge rectification assembly, and the output end of the full-bridge rectification assembly is connected with the first filtering assembly; a first rectification switch tube and a second rectification switch tube in the full-bridge rectification assembly form a first rectification bridge arm, a third rectification switch tube and a fourth rectification switch tube form a second rectification bridge arm, and a fifth rectification switch tube and a sixth rectification switch tube are connected between the midpoint of the first rectification bridge arm and the midpoint of the second rectification bridge arm. A relay is connected between the full-bridge rectification assembly and the first filtering assembly. And two ends of a secondary coil of the transformer are respectively connected with the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm. According to the invention, on-off of different rectification switch tubes and on-off of the relay can be controlled, so that the output voltage range is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of converters, and in particular to a wide range voltage doubler converter circuit and a control method thereof. Background Art

[0002] Traditional small DC chargers or charging modules mostly use two independent DC-DC converters, which are connected in series or parallel by relays to achieve output in a wide voltage range (such as 300V-1000V). This solution can cope with large changes in input and output voltages by connecting different modules in parallel or series to achieve regulation of different power requirements. However, with the increase in power demand, especially the increasing requirements for high power and high efficiency, the design of existing solutions faces some technical challenges, including cost, efficiency and system complexity.

[0003] In the related art, many systems use two independent DC-DC converters to achieve voltage adjustment by switching in series or parallel through relays. Each DC-DC converter controls a different voltage segment, and the relay is used to switch between different voltage ranges to achieve output voltage adjustment.

[0004] However, in the related art, the relay switching scheme will increase the complexity and scheduling difficulty of the system, and the switching frequency and reliability of the relay will also pose a threat to the stability of the system. The system requires multiple MOS tubes to support the switching of different voltage and power segments, which significantly increases the cost of MOS tubes. In high-power applications, since more power switching components are required, the overall cost of MOS tubes may account for a large proportion of the total system cost. In addition, the conversion efficiency of the system may be greatly reduced, thereby affecting the overall performance and reliability of the system. Summary of the invention

[0005] Based on this, it is necessary to provide a wide-range voltage doubler converter circuit and a control method thereof which can expand the voltage output range, reduce the use of switch tubes and reduce costs.

[0006] In a first aspect, the present application provides a wide-range voltage doubler converter circuit. The wide-range voltage doubler converter circuit includes an inverter component, a resonant network, a transformer component, a full-bridge rectifier component, and a first filter component, wherein the input end of the inverter component is connected to the output end of a DC power supply, the output end of the inverter component is connected to the first end of the resonant network, the second end of the resonant network is connected to the primary side of the transformer, the secondary side of the transformer is connected to the input end of the full-bridge rectifier component, and the output end of the full-bridge rectifier component is connected to the first filter component;

[0007] A full-bridge rectifier assembly, used to convert the alternating current converted by the transformer into direct current, comprising a first rectifier switch tube, a second rectifier switch tube, a third rectifier switch tube, a fourth rectifier switch tube, a fifth rectifier switch tube, a sixth rectifier switch tube and a relay, wherein the first rectifier switch tube and the second rectifier switch tube form a first rectifier bridge arm, the third rectifier switch tube and the fourth rectifier switch tube form a second rectifier bridge arm, the fifth rectifier switch tube and the sixth rectifier switch tube are connected between the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm, and a relay is connected between the full-bridge rectifier assembly and the first filter assembly;

[0008] Two ends of the secondary coil of the transformer are connected to the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm respectively.

[0009] In an exemplary embodiment, the source of the fifth rectifier switch tube is connected to the source of the sixth rectifier switch tube, the drain of the fifth rectifier switch tube is connected to the midpoint of the first rectifier bridge arm, and the drain of the sixth rectifier switch tube is connected to the midpoint of the second rectifier bridge arm.

[0010] In an exemplary embodiment, the source of the first rectifier switch tube is connected to the drain of the second rectifier switch tube, the source of the third rectifier switch tube is connected to the drain of the fourth rectifier switch tube, the drain of the first rectifier switch tube is connected to the drain of the third rectifier switch tube, and the source of the second rectifier switch tube is connected to the source of the fourth rectifier switch tube;

[0011] Among them, the connection between the source of the first rectifier switch tube and the drain of the second rectifier switch tube is set as the midpoint of the first rectifier bridge arm, and the connection between the source of the third rectifier switch tube and the drain of the fourth rectifier switch tube is set as the midpoint of the first rectifier bridge arm.

[0012] In an exemplary embodiment, a first end of the relay is connected to a midpoint of the first rectifier bridge arm, and a second end of the relay is connected to the first filter component.

[0013] In an exemplary embodiment, a first end of the relay is connected to a midpoint of the second rectifier bridge arm, and a second end of the relay is connected to the first filter component.

[0014] In an exemplary embodiment, the first filter component includes a first filter capacitor and a second filter capacitor;

[0015] The first end of the first filter capacitor is connected to the drain of the first rectifier switch tube, the second end of the first filter capacitor is connected to the first end of the second filter capacitor, the second end of the second filter capacitor is connected to the source of the second rectifier switch tube, and the second end of the first filter capacitor and the first end of the second filter capacitor are also respectively connected to the second end of the relay.

[0016] In an exemplary embodiment, the inverter assembly includes a first inverter switch tube, a second inverter switch tube, a third inverter switch tube and a fourth inverter switch tube, the first inverter switch tube and the second inverter switch tube form a first inverter bridge arm, and the third inverter switch tube and the fourth inverter switch tube form a second inverter bridge arm;

[0017] The source of the first inverter switch tube is connected to the drain of the second inverter switch tube, the source of the third inverter switch tube is connected to the drain of the fourth inverter switch tube, the drain of the first inverter switch tube is connected to the drain of the third inverter switch tube, and the source of the second inverter switch tube is connected to the source of the fourth inverter switch tube.

[0018] In an exemplary embodiment, the resonant network includes a resonant inductor and a resonant capacitor;

[0019] The first end of the resonant inductor is connected to the midpoint of the first inverter bridge arm, and the second end of the resonant inductor is connected to the first end of the primary coil in the transformer;

[0020] The first end of the resonant capacitor is connected to the midpoint of the second inverter bridge arm, and the second end of the resonant capacitor is connected to the second end of the primary coil in the transformer.

[0021] In a second aspect, the present application further provides a wide-range voltage doubler converter circuit control method, which is applicable to the wide-range voltage doubler converter circuit described in any of the above embodiments. The wide-range voltage doubler converter circuit control method includes:

[0022] Determine a first switch tube to be debugged based on a first preset debugging scheme;

[0023] Performing a debugging operation on the first switch tube to be debugged, and obtaining current voltage data;

[0024] Compare the current voltage data with a preset voltage threshold to obtain a voltage comparison result;

[0025] The preset debugging schemes are screened according to the voltage comparison results to obtain the target debugging scheme.

[0026] In an exemplary embodiment, the preset debugging schemes are screened according to the voltage comparison result to obtain the target debugging scheme, including:

[0027] When the voltage comparison result shows that the current voltage data is less than or equal to the preset voltage threshold, setting the first preset debugging scheme as the target debugging scheme;

[0028] When the voltage comparison result is that the current voltage data is greater than the preset voltage threshold, the second preset debugging scheme is set as the target debugging scheme.

[0029] The above-mentioned wide-range voltage doubler converter circuit and control method thereof can effectively improve the conversion efficiency of DC power to AC power by adopting a combination of an inverter component, a resonant network, a transformer and a full-bridge rectifier component, and efficiently rectify the converted AC power into DC power through the transformer and the rectifier part; the use of a full-bridge rectifier component can further reduce the harmonic interference and loss of the circuit, improve the smoothness and stability of current conversion, and through the coordination between the relay and the rectifier switch tube, it is convenient to effectively switch according to the real-time operating status of the circuit, that is, control the on and off of different rectifier switch tubes and the opening and closing of the relay, ensure that the voltage and current are within a safe range and also expand the output voltage range. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A circuit schematic diagram of a wide range voltage doubler converter circuit according to an embodiment of the present application;

[0032] Figure 2 A circuit schematic diagram of a wide range voltage doubler converter circuit according to another embodiment of the present application;

[0033] Figure 3 A waveform diagram of voltage transformation after circuit switching according to an embodiment of the present application;

[0034] Figure 4 1 is a flow chart of a wide range voltage doubler converter circuit control method according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] Q1-first inverter switch tube, Q2-second inverter switch tube, Q3-third inverter switch tube, Q4-fourth inverter switch tube, Q5-first rectifier switch tube, Q6-second rectifier switch tube, Q7-third rectifier switch tube, Q8-fourth rectifier switch tube, Q9-fifth rectifier switch tube, Q10-sixth rectifier switch tube, C1-primary filter capacitor, C2-resonant capacitor, C3-secondary filter capacitor, C4-first filter capacitor, C5-second filter capacitor, L1-resonant inductor, K1-relay. DETAILED DESCRIPTION

[0037] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0040] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0041] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0042] In some embodiments, the present application provides a wide-range voltage doubler converter circuit. The wide-range voltage doubler converter circuit includes an inverter component, a resonant network, a transformer component, a full-bridge rectifier component, and a first filter component, wherein the input end of the inverter component is connected to the output end of the DC power supply, the output end of the inverter component is connected to the first end of the resonant network, the second end of the resonant network is connected to the primary side of the transformer, the secondary side of the transformer is connected to the input end of the full-bridge rectifier component, and the output end of the full-bridge rectifier component is connected to the first filter component.

[0043] A full-bridge rectifier component includes a first rectifier switch tube, a second rectifier switch tube, a third rectifier switch tube, a fourth rectifier switch tube, a fifth rectifier switch tube, a sixth rectifier switch tube and a relay. The first rectifier switch tube and the second rectifier switch tube form a first rectifier bridge arm, the third rectifier switch tube and the fourth rectifier switch tube form a second rectifier bridge arm, the fifth rectifier switch tube and the sixth rectifier switch tube are connected between the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm, and a relay is connected between the full-bridge rectifier component and the first filter component.

[0044] Two ends of the secondary coil of the transformer are connected to the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm respectively.

[0045] The source of the first rectifier switch tube is connected to the drain of the second rectifier switch tube, the source of the third rectifier switch tube is connected to the drain of the fourth rectifier switch tube, the drain of the first rectifier switch tube is connected to the drain of the third rectifier switch tube, the source of the second rectifier switch tube is connected to the source of the fourth rectifier switch tube. The source of the fifth rectifier switch tube is connected to the source of the sixth rectifier switch tube, the drain of the fifth rectifier switch tube is connected to the midpoint of the first rectifier bridge arm, and the drain of the sixth rectifier switch tube is connected to the midpoint of the second rectifier bridge arm.

[0046] Among them, the connection between the source of the first rectifier switch tube and the drain of the second rectifier switch tube is set as the midpoint of the first rectifier bridge arm, and the connection between the source of the third rectifier switch tube and the drain of the fourth rectifier switch tube is set as the midpoint of the first rectifier bridge arm.

[0047] During the start process:

[0048] In the positive half cycle, when the voltage of the input AC power is positive, the first rectifier switch tube of the first rectifier bridge arm is turned on, the second rectifier switch tube is turned off, and the current flows through the first rectifier switch tube. At this time, the third rectifier switch tube of the second rectifier bridge arm is also turned on, the fourth rectifier switch tube is turned off, and the current flows through the third rectifier switch tube.

[0049] In the negative half cycle, when the voltage of the input AC power is negative, the second rectifier switch tube of the first rectifier bridge arm is turned on, the first rectifier switch tube is turned off, and the current flows through the second rectifier switch tube. At this time, the fourth rectifier switch tube of the second rectifier bridge arm is also turned on, the third rectifier switch tube is turned off, and the current flows through the fourth rectifier switch tube.

[0050] When the output voltage reaches the preset voltage value:

[0051] In the positive half cycle, when the voltage of the input AC power is positive, the first rectifier switch tube and the fifth rectifier switch tube are turned on, and the current flows from the AC power supply through the first rectifier switch tube into the filter capacitor and starts to charge the capacitor.

[0052] In the negative half cycle, when the voltage of the input AC power is negative, the second rectifier switch tube is turned on and the sixth rectifier switch tube is turned on. The current flows into the filter capacitor through the second rectifier switch tube and the sixth rectifier switch tube, and continues to charge it. Due to the different conduction states of the switch tube controlled by the relay in each half cycle, the capacitor is charged in each cycle. By charging the capacitor, the voltage across the capacitor will gradually accumulate, and finally form a voltage doubling effect.

[0053] In the above-mentioned wide-range voltage doubler converter circuit, by adopting a combination of an inverter component, a resonant network, a transformer and a full-bridge rectifier component, the conversion efficiency of the DC power supply to the AC power can be effectively improved, and the converted AC power can be efficiently rectified into DC power through the transformer and the rectifier part; the use of a full-bridge rectifier component can further reduce the harmonic interference and loss of the circuit, improve the smoothness and stability of the current conversion, and through the coordination between the relay and the rectifier switch tube, it is convenient to effectively switch according to the real-time operating status of the circuit, that is, to control the on and off of different rectifier switch tubes and the opening and closing of the relay, to ensure that the voltage and current are within a safe range and also expand the output voltage range.

[0054] See also Figure 1 , Figure 1 A circuit schematic diagram of a wide range voltage doubler converter circuit in an embodiment of the present application is shown, wherein a first end of a relay K1 in a full-bridge rectifier assembly is connected to a midpoint of a second bridge arm formed by a third rectifier switch tube Q7 and a fourth rectifier switch tube Q8.

[0055] Taking the positive and negative half cycles as an example, the voltage of the input AC power is positive in the positive half cycle, and the first rectifier switch tube Q5 and the fifth rectifier switch tube Q9 are turned on. The current flows from the AC power supply into the filter capacitor through the first rectifier switch tube Q5, and begins to charge the capacitor, and the voltage across the capacitor gradually rises. As the current continues to flow in, the voltage of the capacitor gradually increases, and the filter capacitor plays a role in smoothing the DC voltage. When entering the negative half cycle, the voltage of the input AC power is negative, and the second rectifier switch tube Q6 and the sixth rectifier switch tube Q10 are turned on. At this time, the current continues to flow into the filter capacitor through the second rectifier switch tube Q6 and the sixth rectifier switch tube Q10, charging it, and ensuring that the voltage across the capacitor continues to increase.

[0056] Since the rectifier switch tube is controlled by relay K1, the capacitor can be continuously charged in each cycle due to different conduction states in each half cycle. This charging process causes the voltage across the filter capacitor to gradually increase, eventually forming a voltage doubling effect, making the output voltage much higher than the input voltage. The voltage doubling effect is achieved by alternating the conduction and shutdown of the rectifier switch tube, so that the voltage of the capacitor in each cycle is superimposed, thereby achieving high-voltage DC output, which is suitable for occasions requiring high-voltage DC power supply.

[0057] See also Figure 2, Figure 2 A circuit schematic diagram of a wide range voltage doubler converter circuit in another embodiment of the present application is shown, in which the first end of the relay K1 in the full-bridge rectifier assembly is connected to the midpoint of the first bridge arm formed by the first rectifier switch tube Q5 and the second rectifier switch tube Q6.

[0058] exist Figure 2 In the circuit shown, the first rectifier switch tube Q5 and the second rectifier switch tube Q6 are driven out of operation.

[0059] Taking the positive and negative half cycles as an example, the voltage of the input AC power is positive in the positive half cycle, and the third rectifier switch tube Q7 and the sixth rectifier switch tube Q10 are turned on. The current flows from the AC power supply into the filter capacitor through the third rectifier switch tube Q7, and begins to charge the capacitor, and the voltage across the capacitor gradually rises. As the current continues to flow in, the voltage of the capacitor gradually increases, and the filter capacitor plays a role in smoothing the DC voltage. When entering the negative half cycle, the voltage of the input AC power is negative, and the fourth rectifier switch tube Q8 and the fifth rectifier switch tube Q9 are turned on. At this time, the current continues to flow into the filter capacitor through the fourth rectifier switch tube Q8 and the sixth rectifier switch tube Q10, charging it, and ensuring that the voltage across the capacitor continues to increase.

[0060] Since the rectifier switch tube is controlled by relay K1, the capacitor can be continuously charged in each cycle due to different conduction states in each half cycle. This charging process causes the voltage across the filter capacitor to gradually increase, eventually forming a voltage doubling effect, making the output voltage much higher than the input voltage. The voltage doubling effect is achieved by alternating the conduction and shutdown of the rectifier switch tube, so that the voltage of the capacitor in each cycle is superimposed, thereby achieving high-voltage DC output, which is suitable for occasions requiring high-voltage DC power supply.

[0061] Continue reading Figure 1 and Figure 2 The first filter component includes a first filter capacitor C4 and a second filter capacitor C5. The first end of the first filter capacitor C4 is connected to the drain of the first rectifier switch tube Q5, the second end of the first filter capacitor C4 is connected to the first end of the second filter capacitor C5, the second end of the second filter capacitor C5 is connected to the source of the second rectifier switch tube Q6, and the second end of the first filter capacitor C4 and the first end of the second filter capacitor C5 are also connected to the second end of the relay K1 respectively.

[0062] During operation, capacitors are usually used to smooth irregular DC voltages after rectification. Since the rectified voltage is pulsating, the filter capacitor can reduce the voltage fluctuations, reduce the ripple, and make the output voltage more stable. At the same time, in the circuit, the capacitor will be charged according to different conduction states in each half cycle. Due to the alternating conduction and shutdown of the rectifier switch tube, the charging process of the capacitor in each cycle continues, resulting in a gradual increase in the voltage across the filter capacitor. This process forms a voltage doubling effect, that is, when charging each half cycle, the voltage of the capacitor is gradually superimposed, and ultimately the output voltage is much higher than the input voltage. The realization of the voltage doubling effect depends on the control of the switch tube. By alternating on and off, the voltage of the capacitor in each cycle is accumulated, thereby generating a higher DC voltage.

[0063] Continue reading Figure 1 and Figure 2 The inverter assembly includes a first inverter switch tube Q1, a second inverter switch tube Q2, a third inverter switch tube Q3 and a fourth inverter switch tube Q4. The first inverter switch tube Q1 and the second inverter switch tube Q2 form a first inverter bridge arm, and the third inverter switch tube Q3 and the fourth inverter switch tube Q4 form a second inverter bridge arm. A primary filter capacitor C1 is connected between the inverter assembly and the power supply.

[0064] The source of the first inverter switch tube Q1 is connected to the drain of the second inverter switch tube Q2, the source of the third inverter switch tube Q3 is connected to the drain of the fourth inverter switch tube Q4, the drain of the first inverter switch tube Q1 is connected to the drain of the third inverter switch tube Q3, and the source of the second inverter switch tube Q2 is connected to the source of the fourth inverter switch tube Q4.

[0065] The first inverter switch tube Q1, the second inverter switch tube Q2, the third inverter switch tube Q3 and the fourth inverter switch tube Q4 can be combined to form two inverter bridge arms, namely the first inverter bridge arm and the second inverter bridge arm. The first inverter bridge arm is composed of the first inverter switch tube Q1 and the second inverter switch tube Q2, and the second inverter bridge arm is composed of the third inverter switch tube Q3 and the fourth inverter switch tube Q4. By accurately controlling the switching state of these switch tubes, the DC voltage can be converted into an AC output with a specific frequency and amplitude.

[0066] The first inverter switch tube Q1 and the fourth inverter switch tube Q4 are turned on to generate a positive half-cycle AC current; the second inverter switch tube Q2 and the third inverter switch tube Q3 are turned on to generate a negative half-cycle AC current. The on and off states of the switch tubes are controlled according to certain timing rules to ensure that the output voltage waveform has the required frequency.

[0067] In an exemplary embodiment, the resonant network includes a resonant inductor L1 and a resonant capacitor C2. The first end of the resonant inductor L1 is connected to the midpoint of the first inverter bridge arm, and the second end of the resonant inductor L1 is connected to the first end of the primary coil in the transformer. The first end of the resonant capacitor C2 is connected to the midpoint of the second inverter bridge arm, and the second end of the resonant capacitor C2 is connected to the second end of the primary coil in the transformer.

[0068] The resonant inductor L1 is located between the midpoint of the first inverter bridge arm and the first end of the primary side of the transformer, and plays the role of energy storage. The switching action of the inverter bridge arm causes the current to pass through the resonant inductor L1, so that the inductor stores energy. Due to the characteristics of the resonant inductor L1, the current changes relatively smoothly, which helps to reduce the interference of high-frequency harmonics on the circuit.

[0069] The resonant capacitor C2 is located between the midpoint of the second inverter bridge arm and the second end of the transformer primary side. It works together with the resonant inductor L1 to form an LC resonant circuit in the resonant state. The function of the capacitor is to adjust the voltage waveform and filter, ensure the power transmission efficiency of the system, and make the system operate at the resonant frequency to minimize the switching loss.

[0070] In an exemplary embodiment, Figure 1 As shown, Figure 1 The present application provides a wide-range voltage doubler converter circuit. The wide-range voltage doubler converter circuit includes an inverter component, a resonant network, a transformer component, a full-bridge rectifier component, and a first filter component. The input end of the inverter component is connected to the output end of the DC power supply, the output end of the inverter component is connected to the first end of the resonant network, the second end of the resonant network is connected to the primary side of the transformer, the secondary side of the transformer is connected to the input end of the full-bridge rectifier component, and the output end of the full-bridge rectifier component is connected to the first filter component. A secondary filter capacitor C3 is provided between the secondary side of the transformer and the input end of the full-bridge rectifier component.

[0071] The full-bridge rectifier component includes a first rectifier switch tube Q5, a second rectifier switch tube Q6, a third rectifier switch tube Q7, a fourth rectifier switch tube Q8, a fifth rectifier switch tube Q9, a sixth rectifier switch tube Q10 and a relay K1. The first rectifier switch tube Q5 and the second rectifier switch tube Q6 form a first rectifier bridge arm, the third rectifier switch tube Q7 and the fourth rectifier switch tube Q8 form a second rectifier bridge arm, the fifth rectifier switch tube Q9 and the sixth rectifier switch tube Q10 are connected between the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm, and the relay K1 is connected between the full-bridge rectifier component and the first filter component. The two ends of the secondary coil of the transformer are respectively connected to the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm. The source of the first rectifier switch tube Q5 is connected to the drain of the second rectifier switch tube Q6, the source of the third rectifier switch tube Q7 is connected to the drain of the fourth rectifier switch tube Q8, the drain of the first rectifier switch tube Q5 is connected to the drain of the third rectifier switch tube Q7, the source of the second rectifier switch tube Q6 is connected to the source of the fourth rectifier switch tube Q8. The source of the fifth rectifier switch tube Q9 is connected to the source of the sixth rectifier switch tube Q10, the drain of the fifth rectifier switch tube Q9 is connected to the midpoint of the first rectifier bridge arm, and the drain of the sixth rectifier switch tube Q10 is connected to the midpoint of the second rectifier bridge arm. The connection point between the source of the first rectifier switch tube Q5 and the drain of the second rectifier switch tube Q6 is set as the midpoint of the first rectifier bridge arm, and the connection point between the source of the third rectifier switch tube Q7 and the drain of the fourth rectifier switch tube Q8 is set as the midpoint of the first rectifier bridge arm. The first end of the relay K1 is connected to the midpoint of the second bridge arm formed by the third rectifier switch tube Q7 and the fourth rectifier switch tube Q8.

[0072] The first filter component includes a first filter capacitor C4 and a second filter capacitor C5. The first end of the first filter capacitor C4 is connected to the drain of the first rectifier switch tube Q5, the second end of the first filter capacitor C4 is connected to the first end of the second filter capacitor C5, the second end of the second filter capacitor C5 is connected to the source of the second rectifier switch tube Q6, and the second end of the first filter capacitor C4 and the first end of the second filter capacitor C5 are also connected to the second end of the relay K1 respectively.

[0073] The inverter assembly includes a first inverter switch tube Q1, a second inverter switch tube Q2, a third inverter switch tube Q3 and a fourth inverter switch tube Q4. The first inverter switch tube Q1 and the second inverter switch tube Q2 form a first inverter bridge arm, and the third inverter switch tube Q3 and the fourth inverter switch tube Q4 form a second inverter bridge arm. A primary filter capacitor C1 is connected between the inverter assembly and the power supply. The source of the first inverter switch tube Q1 is connected to the drain of the second inverter switch tube Q2, the source of the third inverter switch tube Q3 is connected to the drain of the fourth inverter switch tube Q4, the drain of the first inverter switch tube Q1 is connected to the drain of the third inverter switch tube Q3, and the source of the second inverter switch tube Q2 is connected to the source of the fourth inverter switch tube Q4.

[0074] The resonant network includes a resonant inductor L1 and a resonant capacitor C2. The first end of the resonant inductor L1 is connected to the midpoint of the first inverter bridge arm, and the second end of the resonant inductor L1 is connected to the first end of the primary coil in the transformer. The first end of the resonant capacitor C2 is connected to the midpoint of the second inverter bridge arm, and the second end of the resonant capacitor C2 is connected to the second end of the primary coil in the transformer.

[0075] The inverter component converts the voltage from the DC power supply into AC power. The first inverter switch tube Q1 and the second inverter switch tube Q2 of the inverter constitute the first inverter bridge arm, and the third inverter switch tube Q3 and the fourth inverter switch tube Q4 constitute the second inverter bridge arm. By controlling the on and off of the switch tube, a high-frequency AC signal is formed to drive the resonant network. Then the inverter signal passes through the resonant network, where the resonant inductor L1 and the resonant capacitor C2 work together to generate a suitable resonant frequency and transmit the signal to the primary coil of the transformer. The secondary side of the transformer converts the primary signal into an appropriate AC voltage and outputs it to the full-bridge rectifier component. After that, the full-bridge rectifier component rectifies the AC signal into DC power through multiple rectifier switch tubes. The first rectifier bridge arm and the second rectifier bridge arm are turned on and off by different switch tubes respectively, and the DC power after the flow is smoothed by the filter capacitor. Relay K1 controls the on state of the rectifier switch tube so that the capacitor is continuously charged in each half cycle. The voltage across the capacitor gradually accumulates to form a voltage doubling effect. Finally, when the voltage across the capacitor reaches the preset value, the converter stably outputs the required high voltage, completing the voltage doubling process.

[0076] In an exemplary embodiment, Figure 2 As shown, Figure 2The present application provides a wide-range voltage doubler converter circuit. The wide-range voltage doubler converter circuit includes an inverter component, a resonant network, a transformer component, a full-bridge rectifier component, and a first filter component. The input end of the inverter component is connected to the output end of the DC power supply, the output end of the inverter component is connected to the first end of the resonant network, the second end of the resonant network is connected to the primary side of the transformer, the secondary side of the transformer is connected to the input end of the full-bridge rectifier component, and the output end of the full-bridge rectifier component is connected to the first filter component. A secondary filter capacitor C3 is provided between the secondary side of the transformer and the input end of the full-bridge rectifier component.

[0077] The full-bridge rectifier component includes a first rectifier switch tube Q5, a second rectifier switch tube Q6, a third rectifier switch tube Q7, a fourth rectifier switch tube Q8, a fifth rectifier switch tube Q9, a sixth rectifier switch tube Q10 and a relay K1. The first rectifier switch tube Q5 and the second rectifier switch tube Q6 form a first rectifier bridge arm, the third rectifier switch tube Q7 and the fourth rectifier switch tube Q8 form a second rectifier bridge arm, the fifth rectifier switch tube Q9 and the sixth rectifier switch tube Q10 are connected between the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm, and the relay K1 is connected between the full-bridge rectifier component and the first filter component. The two ends of the secondary coil of the transformer are respectively connected to the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm. The source of the first rectifier switch tube Q5 is connected to the drain of the second rectifier switch tube Q6, the source of the third rectifier switch tube Q7 is connected to the drain of the fourth rectifier switch tube Q8, the drain of the first rectifier switch tube Q5 is connected to the drain of the third rectifier switch tube Q7, the source of the second rectifier switch tube Q6 is connected to the source of the fourth rectifier switch tube Q8. The source of the fifth rectifier switch tube Q9 is connected to the source of the sixth rectifier switch tube Q10, the drain of the fifth rectifier switch tube Q9 is connected to the midpoint of the first rectifier bridge arm, and the drain of the sixth rectifier switch tube Q10 is connected to the midpoint of the second rectifier bridge arm. The connection point between the source of the first rectifier switch tube Q5 and the drain of the second rectifier switch tube Q6 is set as the midpoint of the first rectifier bridge arm, and the connection point between the source of the third rectifier switch tube Q7 and the drain of the fourth rectifier switch tube Q8 is set as the midpoint of the first rectifier bridge arm. The first end of the relay K1 is connected to the midpoint of the first rectifier bridge arm, and the second end of the relay K1 is connected to the first filter component.

[0078] The first filter component includes a first filter capacitor C4 and a second filter capacitor C5. The first end of the first filter capacitor C4 is connected to the drain of the first rectifier switch tube Q5, the second end of the first filter capacitor C4 is connected to the first end of the second filter capacitor C5, the second end of the second filter capacitor C5 is connected to the source of the second rectifier switch tube Q6, and the second end of the first filter capacitor C4 and the first end of the second filter capacitor C5 are also connected to the second end of the relay K1 respectively.

[0079] The inverter assembly includes a first inverter switch tube Q1, a second inverter switch tube Q2, a third inverter switch tube Q3 and a fourth inverter switch tube Q4. The first inverter switch tube Q1 and the second inverter switch tube Q2 form a first inverter bridge arm, and the third inverter switch tube Q3 and the fourth inverter switch tube Q4 form a second inverter bridge arm. A primary filter capacitor C1 is connected between the inverter assembly and the power supply. The source of the first inverter switch tube Q1 is connected to the drain of the second inverter switch tube Q2, the source of the third inverter switch tube Q3 is connected to the drain of the fourth inverter switch tube Q4, the drain of the first inverter switch tube Q1 is connected to the drain of the third inverter switch tube Q3, and the source of the second inverter switch tube Q2 is connected to the source of the fourth inverter switch tube Q4.

[0080] The resonant network includes a resonant inductor L1 and a resonant capacitor C2. The first end of the resonant inductor L1 is connected to the midpoint of the first inverter bridge arm, and the second end of the resonant inductor L1 is connected to the first end of the primary coil in the transformer. The first end of the resonant capacitor C2 is connected to the midpoint of the second inverter bridge arm, and the second end of the resonant capacitor C2 is connected to the second end of the primary coil in the transformer.

[0081] The inverter component converts the voltage from the DC power supply into AC power. The first inverter switch tube Q1 and the second inverter switch tube Q2 of the inverter constitute the first inverter bridge arm, and the third inverter switch tube Q3 and the fourth inverter switch tube Q4 constitute the second inverter bridge arm. By controlling the on and off of the switch tube, a high-frequency AC signal is formed to drive the resonant network. Then the inverter signal passes through the resonant network, where the resonant inductor L1 and the resonant capacitor C2 work together to generate a suitable resonant frequency and transmit the signal to the primary coil of the transformer. The secondary side of the transformer converts the primary signal into an appropriate AC voltage and outputs it to the full-bridge rectifier component. After that, the full-bridge rectifier component rectifies the AC signal into DC power through multiple rectifier switch tubes. The first rectifier bridge arm and the second rectifier bridge arm are turned on and off by different switch tubes respectively, and the DC power after the flow is smoothed by the filter capacitor. Relay K1 controls the on state of the rectifier switch tube so that the capacitor is continuously charged in each half cycle. The voltage across the capacitor gradually accumulates to form a voltage doubling effect. Finally, when the voltage across the capacitor reaches the preset value, the converter stably outputs the required high voltage, completing the voltage doubling process.

[0082] In a specific embodiment, when the output voltage is 150-450V, the K1 relay K1 is disconnected, and the system uses the switch tubes Q1-Q8 for switch modulation and ripple generation. When the output voltage continues to increase to 460V, the DSP will also perform full tube ripple blocking on Q1-Q8, and the K1 relay K1 will be closed after a delay of 1ms. At this time, due to the short delay time, the output electrolytic capacitor voltage Vout cannot be discharged, which is about 460V. The Vds voltage of the power tubes Q7 / Q8; Q9 / Q10 will DSP stop ripple generation and damp oscillation, among which Q7 / Q8Vds will oscillate to 0.5Vout (230V) by itself, and Q9 / Q10 will oscillate to 0V. Since the Q7 / Q8 tubes automatically equalize the voltage, there is no obvious voltage difference of about 10V (not pure in the impact current) before and after the relay K1 is closed, and the risk of closure is small. The DSP uses Q1-Q4 / Q5-Q6 / Q9-Q10 for switch debugging, and the ripple generation system is changed to high-voltage mode ripple generation. At this moment, the system completes the switching, and the output voltage basically does not drop. The specific waveform is as follows Figure 3 shown.

[0083] In an exemplary embodiment, Figure 4 As shown, the present application provides a wide-range voltage doubler converter circuit control method, which is applicable to the wide-range voltage doubler converter circuit described in any of the above embodiments. In this embodiment, the method includes the following steps:

[0084] Step 402: determine a first switch tube to be debugged based on a first preset debugging scheme.

[0085] The first switch tube to be debugged includes four inverter switch tubes in the inverter assembly and the first to fourth rectifier switch tubes.

[0086] Exemplarily, when the circuit starts working, four inverter switches in the inverter assembly are debugged based on the first preset debugging scheme, and the first to fourth rectifier switches are debugged. That is:

[0087] In the positive half cycle, the first inverter switch tube, the fourth inverter switch tube, the first rectifier switch tube and the fourth sorting switch tube are turned on; in the negative half cycle, the second inverter switch tube, the third inverter switch tube, the second rectifier switch tube and the fourth sorting switch tube are turned on.

[0088] Step 404: perform a debugging operation on the first switch tube to be debugged, and obtain current voltage data.

[0089] Exemplarily, after the on-off setting of the switch tube is completed, the voltage data of the output end of the converter, ie, the current voltage data, is measured.

[0090] Step 406, comparing the current voltage data with a preset voltage threshold to obtain a voltage comparison result.

[0091] Exemplarily, the measured converter output terminal voltage data is compared with a preset switching strategy voltage value, ie, a preset voltage threshold, to determine whether strategy adjustment is required. For example, the preset voltage threshold is set to 460 Vdc.

[0092] Step 408 , screening the preset debugging schemes according to the voltage comparison result to obtain a target debugging scheme.

[0093] The preset debugging scheme includes a first preset debugging scheme and a second preset debugging scheme.

[0094] Exemplarily, if the current voltage data does not exceed the preset voltage threshold, the first preset debugging scheme continues to be executed; if the previous voltage data exceeds the preset voltage threshold, the first preset debugging scheme is switched to the second preset debugging scheme and the second preset debugging scheme is executed.

[0095] In an exemplary embodiment, the preset debugging schemes are screened according to the voltage comparison result to obtain the target debugging scheme, including:

[0096] When the voltage comparison result is that the current voltage data is less than or equal to the preset voltage threshold, the first preset debugging scheme is set as the target debugging scheme; when the voltage comparison result is that the current voltage data is greater than the preset voltage threshold, the second preset debugging scheme is set as the target debugging scheme.

[0097] Exemplarily, if the current voltage data does not exceed the preset voltage threshold, the first preset debugging scheme is executed, that is:

[0098] In the positive half cycle, the first inverter switch tube, the fourth inverter switch tube, the first rectifier switch tube and the fourth sorting switch tube are turned on; in the negative half cycle, the second inverter switch tube, the third inverter switch tube, the second rectifier switch tube and the fourth sorting switch tube are turned on.

[0099] If the current voltage data does not exceed the preset voltage threshold, the second preset debugging scheme is executed, namely:

[0100] When the relay is closed, the first inverter switch tube, the fourth inverter switch tube, the first rectifier switch tube and the fifth rectifier switch tube are turned on in the positive half cycle; the second inverter switch tube, the third inverter switch tube, the second rectifier switch tube and the sixth rectifier switch tube are turned on in the negative half cycle; or

[0101] When the relay is closed, the first inverter switch tube, the fourth inverter switch tube, the third rectifier switch tube and the sixth rectifier switch tube are turned on in the positive half cycle; the second inverter switch tube, the third inverter switch tube, the fourth rectifier switch tube and the fifth rectifier switch tube are turned on in the negative half cycle.

[0102] In an exemplary embodiment, the present application provides a wide-range voltage doubler converter circuit control method, which is applicable to the wide-range voltage doubler converter circuit described in any of the above embodiments. In this embodiment, the method includes the following steps:

[0103] A first switch tube to be debugged is determined based on a first preset debugging scheme.

[0104] A debugging operation is performed on the first switch tube to be debugged, and current voltage data is obtained.

[0105] The current voltage data is compared with a preset voltage threshold to obtain a voltage comparison result.

[0106] When the voltage comparison result is that the current voltage data is less than or equal to the preset voltage threshold, the first preset debugging scheme is set as the target debugging scheme.

[0107] When the voltage comparison result is that the current voltage data is greater than the preset voltage threshold, the second preset debugging scheme is set as the target debugging scheme.

[0108] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A wide range voltage doubler converter circuit, characterized in that: It includes an inverter component, a resonant network, a transformer component, a full-bridge rectifier component and a first filter component, wherein the input end of the inverter component is connected to the output end of the DC power supply, the output end of the inverter component is connected to the first end of the resonant network, the second end of the resonant network is connected to the primary side of the transformer, the secondary coil of the transformer is connected to the input end of the full-bridge rectifier component, and the output end of the full-bridge rectifier component is connected to the first filter component; The full-bridge rectifier assembly is used to convert the alternating current converted by the transformer into direct current, and comprises a first rectifier switch tube, a second rectifier switch tube, a third rectifier switch tube, a fourth rectifier switch tube, a fifth rectifier switch tube, a sixth rectifier switch tube and a relay, wherein the first rectifier switch tube and the second rectifier switch tube form a first rectifier bridge arm, the third rectifier switch tube and the fourth rectifier switch tube form a second rectifier bridge arm, the fifth rectifier switch tube and the sixth rectifier switch tube are connected between the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm, and the relay is connected between the full-bridge rectifier assembly and the first filter assembly; Two ends of the secondary coil of the transformer are connected to the midpoint of the first rectifier bridge arm and the midpoint of the second rectifier bridge arm respectively.

2. The wide range voltage doubler converter circuit according to claim 1, characterized in that: The source of the fifth rectifier switch tube is connected to the source of the sixth rectifier switch tube, the drain of the fifth rectifier switch tube is connected to the midpoint of the first rectifier bridge arm, and the drain of the sixth rectifier switch tube is connected to the midpoint of the second rectifier bridge arm.

3. The wide range voltage doubler converter circuit according to claim 2, characterized in that: The source of the first rectifier switch tube is connected to the drain of the second rectifier switch tube, the source of the third rectifier switch tube is connected to the drain of the fourth rectifier switch tube, the drain of the first rectifier switch tube is connected to the drain of the third rectifier switch tube, and the source of the second rectifier switch tube is connected to the source of the fourth rectifier switch tube; Among them, the connection between the source of the first rectifier switch tube and the drain of the second rectifier switch tube is set as the midpoint of the first rectifier bridge arm, and the connection between the source of the third rectifier switch tube and the drain of the fourth rectifier switch tube is set as the midpoint of the first rectifier bridge arm.

4. The wide range voltage doubler converter circuit according to claim 3, characterized in that: A first end of the relay is connected to the midpoint of the first rectifier bridge arm, and a second end of the relay is connected to the first filter component.

5. The wide range voltage doubler converter circuit according to claim 3, characterized in that: A first end of the relay is connected to the midpoint of the second rectifier bridge arm, and a second end of the relay is connected to the first filter component.

6. The wide range voltage doubler converter circuit according to claim 3 or 4, characterized in that: The first filter component includes a first filter capacitor and a second filter capacitor; The first end of the first filter capacitor is connected to the drain of the first rectifier switch tube, the second end of the first filter capacitor is connected to the first end of the second filter capacitor, the second end of the second filter capacitor is connected to the source of the second rectifier switch tube, and the second end of the first filter capacitor and the first end of the second filter capacitor are also respectively connected to the second end of the relay.

7. The wide range voltage doubler converter circuit according to claim 1, characterized in that: The inverter assembly includes a first inverter switch tube, a second inverter switch tube, a third inverter switch tube and a fourth inverter switch tube, the first inverter switch tube and the second inverter switch tube form a first inverter bridge arm, and the third inverter switch tube and the fourth inverter switch tube form a second inverter bridge arm; The source of the first inverter switch tube is connected to the drain of the second inverter switch tube, the source of the third inverter switch tube is connected to the drain of the fourth inverter switch tube, the drain of the first inverter switch tube is connected to the drain of the third inverter switch tube, and the source of the second inverter switch tube is connected to the source of the fourth inverter switch tube.

8. The wide range voltage doubler converter circuit according to claim 7, characterized in that: The resonant network includes a resonant inductor and a resonant capacitor; The first end of the resonant inductor is connected to the midpoint of the first inverter bridge arm, and the second end of the resonant inductor is connected to the first end of the primary coil in the transformer; The first end of the resonant capacitor is connected to the midpoint of the second inverter bridge arm, and the second end of the resonant capacitor is connected to the second end of the primary coil in the transformer.

9. A wide range voltage doubler converter circuit control method, applicable to the wide range voltage doubler converter circuit as claimed in any one of claims 1 to 8, characterized in that: The method comprises: Determine a first switch tube to be debugged based on a first preset debugging scheme; Performing a debugging operation on the first switch tube to be debugged, and obtaining current voltage data; Comparing the current voltage data with a preset voltage threshold to obtain a voltage comparison result; The preset debugging schemes are screened according to the voltage comparison result to obtain a target debugging scheme.

10. The wide range voltage doubler converter circuit control method according to claim 9, characterized in that: The preset debugging scheme includes a first preset debugging scheme and a second preset debugging scheme; The step of screening the preset debugging scheme according to the voltage comparison result to obtain the target debugging scheme includes: When the voltage comparison result is that the current voltage data is less than or equal to the preset voltage threshold, setting the first preset debugging scheme as the target debugging scheme; When the voltage comparison result is that the current voltage data is greater than the preset voltage threshold, the second preset debugging scheme is set as the target debugging scheme.

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