A zero voltage start-up power conversion system, method and starting device

Abstract

The present invention belongs to the technical field of power conversion, and specifically relates to a zero-voltage starting power conversion system, method and starting device, including an input module, a power conversion module, a filter module, a control module and an output module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; the power conversion module is provided with multiple and connected in series. The system is provided with multiple power conversion modules to convert the input voltage step by step, and the filter module is provided at the output end of each power conversion module for filtering, thereby effectively reducing the ripple voltage in the circuit. The system detects the voltage in the circuit before the voltage is input to the load, and compares the actual voltage with the target voltage to determine whether the voltage is within the preset range. If not, the voltage is compensated and then outputted. If so, it is directly outputted to the load, thereby effectively improving the accuracy and stability of the output voltage.

Description

Technical Field

[0001] The present invention belongs to the technical field of power conversion, and in particular relates to a zero-voltage starting power conversion system, method and starting device. Background Art

[0002] The main function of the power conversion system is to convert one form of power into another form to meet the power requirements of different devices or systems. For example, the most common conversion method is voltage conversion, and other conversion methods include current conversion, frequency conversion, waveform conversion, etc.

[0003] Since different electronic devices have different operating voltages, and the same electronic device also has multiple electronic components, each of which may have a different normal operating voltage, a power conversion system is required in the electronic device to adjust the output voltage value to supply the power required by the electronic device.

[0004] Although the power conversion system can convert the power to a certain voltage during the conversion process, the actual voltage value of the converted output may be different from the target voltage value, and there is a certain ripple voltage in the output voltage after the voltage conversion.

[0005] Therefore, how to improve the existing power conversion system to enhance the accuracy of the output voltage of the power conversion system and reduce the ripple voltage in the output voltage is a technical problem that urgently needs to be solved. Summary of the invention

[0006] The object of the present invention is to provide a zero voltage start-up power conversion system, method and starting device to improve the accuracy of the output voltage of the power conversion system and reduce the technical problem of ripple voltage in the output voltage.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, a zero voltage start-up power conversion method is provided, comprising the following steps:

[0009] S1: Input the target voltage value, detect the real-time input voltage value of the power supply, and calculate the voltage difference value according to the target voltage value and the real-time input voltage value;

[0010] S2: Calculate the step-by-step conversion scheme according to the pressure difference value;

[0011] S3: Perform power conversion according to the calculated step-by-step conversion scheme;

[0012] S4: Detect the converted output voltage value, and compare the output voltage value with the target voltage value to determine whether the voltage difference between the output voltage value and the target voltage value is within a preset range. If so, input it to the load; if not, execute S5;

[0013] S5: Compare the voltage difference with a preset difference range, and compensate the output voltage according to the comparison result.

[0014] Preferably, the step-by-step conversion scheme in step S2 includes the following steps:

[0015] S21: Calculating the voltage regulation amount of each level according to the voltage difference between the target voltage value and the real-time input voltage value and the number of regulation levels;

[0016] S22: Calculating the voltage conversion ratio according to each level of voltage regulation;

[0017] S23: Performing voltage conversion step by step according to the voltage conversion ratio of each stage.

[0018] In a second aspect, a zero-voltage start-up power conversion system is provided to implement any one of the zero-voltage start-up power conversion methods described above, comprising an input module, a power conversion module, a filter module, a voltage compensation module, a control module and an output module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; wherein a plurality of the power conversion modules are provided, and the plurality of the power conversion modules are connected in series in sequence;

[0019] The input module is used to input a target voltage value;

[0020] The power conversion module is provided in plurality and is used to convert the power supply voltage step by step;

[0021] The filtering module is provided in plurality and is used to filter the voltage converted by each power conversion module;

[0022] The voltage compensation module is used to compensate the voltage after the step-by-step conversion;

[0023] The control module is used to control the power conversion module, the filter module, the voltage compensation module and the output module;

[0024] The output module is used to output the converted voltage to the load.

[0025] Preferably, the filter modules are also provided in plurality, and the number of the filter modules is the same as the number of the power conversion modules, and each of the filter modules is arranged at the output end of each of the power conversion modules.

[0026] Preferably, the power conversion module includes a transformer, a rectifier circuit, and a voltage stabilizing circuit. The transformer is connected to the rectifier circuit, and the rectifier circuit is connected to the voltage stabilizing circuit.

[0027] Preferably, the filtering module is a capacitor filtering circuit or an inductor filtering circuit, the capacitor filtering circuit includes a capacitor and a resistor, and the capacitor and the resistor are connected in parallel; the inductor filtering circuit includes an inductor and a resistor, and the inductor and the resistor are connected in series.

[0028] Preferably, the voltage compensation module includes a comparator, an operational amplifier, a plurality of resistors and capacitors;

[0029] The comparator is used to compare the converted voltage with the target voltage and generate an error voltage. The error voltage is sent to the operational amplifier, and the operational amplifier adjusts the output voltage according to the error voltage.

[0030] In a third aspect, a zero voltage starting device is used to start a power conversion system with zero voltage starting as described in any one of the above, comprising a zero voltage starting circuit, wherein the zero voltage starting circuit comprises a switch, a capacitor, a diode, a first inductor and a second inductor;

[0031] The capacitor is connected in parallel to both ends of the switch, the first inductor and the second inductor are connected in series, the cathode of the diode is connected to the first inductor and the second inductor respectively, and the anode of the diode is connected to the power supply.

[0032] The beneficial effects of the present invention include:

[0033] The power conversion system, method and starting device for zero-voltage startup provided by the present invention include an input module, a power conversion module, a filter module, a control module and an output module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; wherein the power conversion module is provided with a plurality of power conversion modules, and the plurality of power conversion modules are connected in series in sequence. By providing a plurality of power conversion modules to convert the input voltage step by step, and by providing a filter module at the output end of each power conversion module for filtering, the ripple voltage in the circuit is effectively reduced. And before the voltage is input to the load, the voltage in the circuit is detected, and the actual voltage is compared with the target voltage to determine whether the voltage is within the preset range. If not, voltage compensation is performed and then outputted. If so, it is directly outputted to the load, which effectively improves the accuracy and stability of the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the circuit structure of the power conversion module of the present invention.

[0035] Figure 2 It is a schematic diagram of the circuit structure of the filter module of the present invention.

[0036] Figure 3 It is a schematic diagram of the circuit structure of the voltage compensation module of the present invention.

[0037] Figure symbols: Vin voltage input terminal, Vout voltage output terminal; C1 first capacitor; C2 second capacitor; C3 third capacitor; C4 fourth capacitor; C5 fifth capacitor; C6 sixth capacitor; C7 seventh capacitor; C8 eighth capacitor; C9 ninth capacitor; R1 first resistor; R2 second resistor; R3 third resistor; R4 fourth resistor; R5 fifth resistor; R6 sixth resistor; R7 seventh resistor; R8 eighth resistor; R9 ninth resistor; R10 tenth resistor; R12 twelfth resistor; R13 thirteenth resistor; L1 first inductor; L2 second inductor; L3 third inductor; D1 first diode; D2 second diode; D3 third diode; A1 first operational amplifier; A2 second operational amplifier. DETAILED DESCRIPTION

[0038] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0039] The present application will present various aspects, embodiments or features around a system that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. In addition, combinations of these schemes may also be used.

[0040] In addition, in the embodiments of the present application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a specific way.

[0041] The following is combined with Figure 1~Figure 3 The present invention is further described in detail:

[0042] A zero voltage start-up power conversion method comprises the following steps:

[0043] S1: Input the target voltage value, detect the real-time input voltage value of the power supply, and calculate the voltage difference value according to the target voltage value and the real-time input voltage value.

[0044] S2: Calculate the step-by-step conversion scheme according to the voltage difference value. In calculating the step-by-step conversion scheme, the difference between the actual input voltage and the target voltage is considered on the one hand, and the number of power conversion modules is considered on the other hand. The conversion amount of each stage is calculated according to the number and the voltage difference value.

[0045] S3: Power conversion is performed according to the calculated step-by-step conversion scheme, the input of the first-stage power conversion module is the output voltage of the power supply, the input voltage of the second-stage power conversion is the output voltage of the first-stage power conversion module, the input voltage of the third-stage power conversion is the output voltage of the second-stage power conversion module, and so on. The number of power conversion modules can be adjusted according to actual needs. Filtering will be performed after each stage of power conversion to reduce the ripple voltage in the circuit.

[0046] S4: Detect the output voltage value after the last voltage conversion, and compare the output voltage value with the target voltage value to determine whether the voltage difference between the output voltage value and the target voltage value is within a preset range. If so, input it to the load; if not, execute S5;

[0047] S5: Compare the voltage difference with the preset range. If the voltage difference between the output voltage value and the target voltage value is within the preset difference range, it is directly output to the load. If the voltage difference between the output voltage value and the target voltage value is not within the preset range, the output voltage is compensated according to the comparison result to ensure that the voltage difference between the output voltage value and the target voltage value is within the preset difference range, thereby improving the accuracy of the output voltage.

[0048] The step-by-step conversion scheme in step S2 includes the following steps:

[0049] S21: Calculating the voltage regulation amount of each level according to the voltage difference between the target voltage value and the real-time input voltage value and the number of regulation levels;

[0050] S22: Calculating the voltage conversion ratio according to each level of voltage regulation;

[0051] S23: Performing voltage conversion step by step according to the voltage conversion ratio of each stage.

[0052] The specific process of voltage compensation in step S5 is as follows:

[0053] S51: Calculating a voltage compensation amount according to a voltage difference and a preset difference range;

[0054] S52: amplifying the voltage compensation signal;

[0055] S53: Outputting a compensated voltage according to the amplified signal.

[0056] In the above scheme, on the one hand, the voltage is converted step by step during the power conversion process, and in the voltage conversion process of each level, each level of voltage conversion is filtered to reduce the ripple voltage generated during the voltage conversion process. Since if a power conversion is performed during the voltage conversion process, the voltage difference before and after the voltage conversion is large, the large voltage difference is very likely to cause a large ripple voltage in the circuit, thereby affecting the performance of the load. Therefore, when performing voltage conversion, a step-by-step conversion method is adopted, so that the voltage difference before and after each level of voltage conversion is significantly reduced, thereby effectively reducing the ripple voltage in the circuit. And when the ripple voltage in the circuit is small, it is easier to reduce the ripple voltage in the circuit through filtering.

[0057] On the other hand, by detecting the actual voltage value after the last stage of power conversion and comparing it with the target voltage value, the voltage difference between the actual voltage value and the target voltage value is calculated, and the voltage difference is compared with the preset difference range. If it is not within the preset difference range, voltage compensation is required. Voltage compensation processing effectively improves the accuracy of the output voltage and ensures the normal operation of the load.

[0058] A zero-voltage start-up power conversion system implements any one of the zero-voltage start-up power conversion methods described above, comprising an input module, a power conversion module, a filter module, a voltage compensation module, a control module and an output module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; wherein a plurality of the power conversion modules are provided, and the plurality of the power conversion modules are connected in series in sequence.

[0059] Among them, the input module is used to input the target voltage value; the power conversion module is provided with multiple modules for converting the power supply voltage step by step; the filter module is provided with multiple modules for filtering the voltage converted by each power conversion module; the voltage compensation module is used to compensate the voltage after step-by-step conversion; the control module is used to control the power conversion module, the filter module, the voltage compensation module and the output module; the output module is used to output the converted voltage to the load. The power conversion module includes a transformer, a rectifier circuit and a voltage stabilizing circuit, the transformer is connected to the rectifier circuit, and the rectifier circuit is connected to the voltage stabilizing circuit. The voltage compensation module includes a comparator, an operational amplifier, a plurality of resistors and capacitors.

[0060] See also Figure 1, the power conversion module can be provided with a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a first resistor R1, a second resistor R2, and a chip U, wherein the chip U model is TPS54331D, one end of the first capacitor C1 is connected to the voltage input terminal Vin, and one end is grounded, one end of the second capacitor C2 is connected to the BOOT port of the chip U, the BOOT port is the startup port, and the other end is connected to the first inductor L1 and the PH port of the chip U, and the PH port is a sensor interface. The voltage input terminal VIN port and the enable port EN port of the chip U are both connected to the power input terminal; the third capacitor C3 is connected in parallel to both ends of the first resistor R1, and one end is connected to the first inductor L1 after parallel connection, and the other end is connected to the second resistor R2 and the COMP port of the chip U, the COMP port is a common port, and the ground port GND is grounded. One end of the fourth capacitor C4 is connected to the first inductor L1 and the power output terminal Vout, and the other end is connected to the second resistor R2 and grounded.

[0061] There are also multiple filter modules, and the number of the filter modules is the same as the number of the power conversion modules, and each of the filter modules is arranged at the output end of each of the power conversion modules. After each level of the power conversion module converts the voltage, it is filtered by the filter module to reduce the ripple voltage in the circuit and prevent the ripple voltage from affecting the normal operation of the load.

[0062] The filter module is a capacitor filter circuit or an inductor filter circuit. The capacitor filter circuit includes a capacitor and a resistor, and the capacitor and the resistor are connected in parallel; the inductor filter circuit includes an inductor and a resistor, and the inductor and the resistor are connected in series.

[0063] See also Figure 2 The filtering module may include a fifth capacitor C5, a sixth capacitor C6, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first operational amplifier A1. One end of the fifth capacitor C5 is connected to the voltage input terminal Vin, and one end is connected to the sixth capacitor C6 and the fifth resistor R5. One end of the sixth capacitor C6 is connected to the positive electrode of the first operational amplifier A1 and the sixth resistor R6. One end of the third resistor R3 is connected to the power input terminal, and the other end is connected to the negative electrode of the first operational amplifier A1. One end of the fourth resistor R4 is connected to the third resistor R3, and the other end is connected to the power output terminal. The output terminal of the first operational amplifier A1 is connected to the power output terminal.

[0064] See also Figure 3The voltage compensation module includes a comparator CMP, a second operational amplifier A2, a first diode D1, a second diode D2, a second inductor L2, a third inductor L3, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a twelfth resistor R12, a thirteenth resistor R13 and a triode. The voltage signal input terminal is connected to the positive voltage electrode Vin of the comparator CMP, the reference voltage signal input terminal is connected to the negative voltage electrode Vr of the comparator CMP, the output terminal of the comparator CMP is connected to the positive electrode of the first diode D1, the first diode D1 is grounded through the twelfth resistor R12 and the thirteenth resistor R13, one end of the second inductor L2 is respectively connected to the negative electrode of the first diode D1 and the twelfth resistor R12, and the other end is connected to the seventh resistor R7 and the positive electrode of the second diode D2.

[0065] The seventh resistor R7 is connected in series with the seventh capacitor C7, the third diode D3 is connected in series with the eighth resistor R8, the cathode of the second diode D2 is connected to the ninth resistor R9 and the eighth capacitor C8 respectively, and the other end of the ninth capacitor C9 is connected to the emitter e of the transistor. The twelfth resistor R12 is connected to the collector c of the transistor, and the base b of the transistor is connected to the in-phase input terminal of the second operational amplifier A2. The eighth resistor R8 is connected to the cathode of the second operational amplifier A2 through the tenth resistor R10, the ninth resistor R9 is connected to the voltage output terminal Vout through the third inductor L3, and the output terminal of the second operational amplifier A2 is connected to the voltage output terminal Vout through the ninth capacitor C9.

[0066] The comparator CMP is used to compare the converted voltage with the target voltage and generate an error voltage. The error voltage is sent to the second operational amplifier A2. The second operational amplifier A2 adjusts the output voltage according to the error voltage.

[0067] In summary, the zero-voltage start-up power conversion system, method and starting device provided by the present invention include an input module, a power conversion module, a filter module, a control module and an output module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; wherein the power conversion module is provided with multiple, and the multiple power conversion modules are connected in series in sequence. By setting multiple power conversion modules to convert the input voltage step by step, and by setting a filter module at the output end of each power conversion module for filtering, the ripple voltage in the circuit is effectively reduced. And before the voltage is input to the load, the voltage in the circuit is detected, and the actual voltage is compared with the target voltage to determine whether the voltage is within the preset range. If not, the voltage compensation is performed and then output. If so, it is directly output to the load, which effectively improves the accuracy and stability of the output voltage.

[0068] The above-mentioned embodiments only express the specific implementation method of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A zero voltage start power conversion system, characterized in that: It includes an input module, a power conversion module, a filter module, a voltage compensation module, an output module and a control module; the input module, the power conversion module, the filter module, the voltage compensation module and the output module are all connected to the control module; wherein a plurality of the power conversion modules are provided, and the plurality of the power conversion modules are connected in series in sequence; The input module is used to input a target voltage value; The power conversion module is provided in plurality and is used to convert the power supply voltage step by step; The filtering module is provided in plurality and is used to filter the voltage converted by each power conversion module; The voltage compensation module is used to compensate the voltage after the step-by-step conversion; The control module is used to control the power conversion module, the filter module, the voltage compensation module and the output module; The output module is used to output the converted voltage to a load; The voltage compensation module comprises a comparator (CMP), a second operational amplifier (A2), a first diode (D1), a second diode (D2), a second inductor (L2), a third inductor (L3), a seventh capacitor (C7), an eighth capacitor (C8), a ninth capacitor (C9), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), a twelfth resistor (R12), a thirteenth resistor (R13) and a transistor; a voltage signal input terminal of the voltage compensation module is connected to a positive voltage electrode Vin of the comparator (CMP), a reference voltage signal input terminal is connected to a negative voltage electrode Vr of the comparator (CMP), an output terminal of the comparator (CMP) is connected to a positive electrode of the first diode (D1), the first diode (D1) is grounded through the twelfth resistor (R12) and the thirteenth resistor (R13), one end of the second inductor (L2) is connected to The cathode of the first diode (D1) and the twelfth resistor (R12) are connected, and the other end is connected to the seventh resistor (R7) and the anode of the second diode (D2); the seventh resistor (R7) and the seventh capacitor (C7) are connected in series, the third diode (D3) and the eighth resistor (R8) are connected in series, the cathode of the second diode (D2) is connected to the ninth resistor (R9) and the eighth capacitor (C8) respectively, and the other end of the ninth capacitor (C9) is connected to the emitter e of the transistor; the twelfth resistor (R12) is connected to the collector c of the transistor, and the base b of the transistor is connected to the non-inverting input terminal of the second operational amplifier (A2); the eighth resistor (R8) is connected to the cathode of the second operational amplifier (A2) through the tenth resistor (R10), the ninth resistor (R9) is connected to the voltage output terminal Vout through the third inductor (L3), and the output terminal of the second operational amplifier (A2) is connected to the voltage output terminal Vout through the ninth capacitor (C9); The power conversion system implements a power conversion method for zero voltage startup, and the power conversion method comprises the following steps: S1: Input the target voltage value, detect the real-time input voltage value of the power supply, and calculate the voltage difference value according to the target voltage value and the real-time input voltage value; S2: Calculate the step-by-step conversion scheme according to the pressure difference value; S3: Perform power conversion according to the calculated step-by-step conversion scheme; S4: Detect the converted output voltage value, and compare the output voltage value with the target voltage value to determine whether the voltage difference between the output voltage value and the target voltage value is within a preset range. If so, input it to the load; if not, execute S5; S5: Compare the voltage difference with a preset difference range, and compensate the output voltage according to the comparison result; The step-by-step conversion scheme in step S2 includes the following steps: S21: Calculating the voltage regulation amount of each level according to the voltage difference between the target voltage value and the real-time input voltage value and the number of regulation levels; S22: Calculating the voltage conversion ratio according to each level of voltage regulation; S23: Performing voltage conversion step by step according to the voltage conversion ratio of each stage.

2. A zero voltage start-up power conversion system according to claim 1, characterized in that: There are also a plurality of filter modules, and the number of the filter modules is the same as the number of the power conversion modules. Each of the filter modules is arranged at the output end of each of the power conversion modules.

3. A zero voltage start-up power conversion system according to claim 1, characterized in that: The power conversion module includes a transformer, a rectifier circuit, and a voltage stabilizing circuit. The transformer is connected to the rectifier circuit, and the rectifier circuit is connected to the voltage stabilizing circuit.

4. The zero voltage start power conversion system according to claim 1, characterized in that: The filter module is a capacitor filter circuit or an inductor filter circuit. The capacitor filter circuit includes a capacitor and a resistor, and the capacitor and the resistor are connected in parallel; the inductor filter circuit includes an inductor and a resistor, and the inductor and the resistor are connected in series.

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