Voltage doubling rectifying circuit system, device and power supply control chip

Abstract

The invention discloses a voltage-multiplying rectification circuit system, equipment and a power supply control chip, the voltage-multiplying rectification circuit system comprises a voltage-multiplying rectification circuit module used for carrying out rectification processing on an input AC voltage to output a bus voltage, and a converter module used for carrying out DC-DC conversion on an output voltage of the voltage-multiplying rectification circuit module to output a DC voltage, the input voltage sampling circuit module is used for sampling the input voltage of the voltage doubling rectifying circuit module to obtain an input alternating-current voltage instantaneous value, and the gain compensation circuit module is used for performing gain compensation calculation on the input alternating-current voltage instantaneous value to obtain an input alternating-current voltage instantaneous value after gain compensation; and the control module is used for controlling the connection and disconnection of the gain compensation circuit module according to an input alternating voltage peak value, the bus voltage peak value and the working mode of the converter module, and controlling the working mode of the voltage doubling rectifying circuit module.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a voltage doubler rectifier circuit system, device and power control chip. Background Technology

[0002] In existing technologies, power electronic converters mainly include LLC converters and AHB (Asymmetrical Half-Bridge) Flyback converters. LLC converters are widely used due to their high efficiency and high power density. They achieve soft switching through resonant circuits, significantly reducing switching losses and improving efficiency. LLC converters also exhibit low electromagnetic interference (EMI) characteristics, making them suitable for applications with stringent EMI requirements. AHB Flyback converters, on the other hand, are favored for their high efficiency and cost-effectiveness. They achieve high efficiency by recovering leakage inductance energy, reducing switching losses. The secondary side of the AHB architecture uses a single-power device topology, effectively reducing system costs. They are suitable for wide voltage output, especially advantageous in applications requiring high output voltages, such as PD fast charging. The AHB switching frequency is limited to a relatively small range, which is highly beneficial for EMI filter design.

[0003] However, the two circuits mentioned above have a narrow input voltage range, often requiring the addition of a PFC (Power Factor Correction) boost circuit to accommodate a wider input AC voltage range. Global grid voltage standards vary; for example, North America uses 120V, while parts of Europe and Asia use 230V. A wide input voltage range of 85V to 265V can cover these different grid voltages, ensuring that power supply equipment can operate normally worldwide. Without a PFC boost circuit, it often only works in single high-voltage (176Vac to 300Vac) applications. To operate at low-voltage inputs, a redesign or the addition of a boost circuit is necessary, increasing costs; otherwise, it cannot accommodate the wide voltage range of 85V to 265V.

[0004] In existing technologies, voltage doubler rectifier circuits are commonly used to boost the bus voltage, expanding the operating range of the aforementioned converters. The control logic is as follows: when the peak AC input voltage is low, the switch is closed to enable the voltage doubler rectifier circuit; when the peak AC input voltage is high, the switch is opened to disable the voltage doubler rectifier circuit, entering the traditional uncontrolled rectification state. However, in traditional technical solutions, ordinary diode rectification sampling is used. When the voltage doubler rectifier circuit is in voltage doubler rectification mode, the detected peak input voltage increases to twice its original value, causing the system to misjudge the peak input voltage, which in turn affects the control of the voltage doubler rectifier circuit. To accurately obtain the AC voltage, the current mainstream solution is to use differential sampling. However, this method requires operational amplifiers, which in turn require an additional power supply, increasing system design complexity and cost, hindering widespread adoption.

[0005] Other alternative solutions include replacing the voltage doubler rectifier circuit with a mechanical switch. If the peak AC input voltage is low, the switch is manually toggled to put the converter into voltage doubler rectification mode; otherwise, the switch is manually disconnected to allow the system to operate in normal rectification mode. This method requires professional operation; otherwise, there is a risk of damaging the machine. When the grid voltage fluctuates significantly, there is also a risk of overvoltage damage. Summary of the Invention

[0006] Based on the above situation, the main objective of this invention is to provide a voltage doubler rectifier circuit system, device, and power control chip, which enables existing converter circuits to adapt to global power grid standards when used alone, improves system stability and reliability, simplifies design and reduces costs, and meets various application scenarios.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A voltage doubler rectifier circuit system, comprising: The voltage doubler rectifier circuit module is used to rectify the input AC voltage to produce the output bus voltage. The converter module is used to perform DC-DC conversion on the output voltage of the voltage doubler rectifier circuit module to output a DC voltage. The input voltage sampling circuit module is used to sample the input voltage of the voltage doubler rectifier circuit module to obtain the instantaneous value of the input AC voltage. The gain compensation circuit module is used to perform gain compensation on the obtained instantaneous value of the input AC voltage. The control module is used to calculate the peak value of the input AC voltage and the peak value of the bus voltage based on the instantaneous value of the input AC voltage output from the gain compensation circuit module and the bus voltage. Based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module, the control module controls the on / off state of the gain compensation circuit module, and also controls the operating mode of the voltage doubler rectifier circuit module. The voltage doubler rectifier circuit module has two operating modes: full-wave rectification mode and voltage doubler rectification mode. When in full-wave rectification mode, the gain compensation circuit module does not perform gain compensation processing. When in voltage doubler rectification mode, the gain compensation circuit module performs gain compensation processing to obtain the instantaneous value of the input AC voltage after gain compensation.

[0009] Preferably, the anode of the first sampling diode is connected to the neutral terminal of the input AC power supply of the voltage doubler rectifier circuit module, the anode of the second sampling diode is connected to the live terminal of the input AC power supply of the voltage doubler rectifier circuit module, the first sampling resistor and the second sampling resistor are connected in series and grounded, and the cathodes of the first sampling diode and the second sampling diode are both connected to one end of the first sampling resistor.

[0010] Preferably, the gain compensation circuit module includes a third sampling resistor and a gain compensation switch. The first sampling resistor and the second sampling resistor are connected in series, and then connected in series with the third sampling resistor and grounded. One end of the gain compensation switch is connected to the connection line of the second sampling resistor and the third sampling resistor, and the other end is grounded. The first input terminal of the control module is connected to the connection line of the first sampling resistor and the second sampling resistor to obtain the instantaneous value of the input AC voltage. The second output terminal of the control module is connected to the gain compensation switch to control the gain compensation switch to be turned on and off according to the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module. When the control module controls the voltage doubler rectifier circuit module to operate in the full-wave rectification mode, the gain compensation switch is turned off, and the instantaneous value of the input AC voltage is K1 times the sampling voltage.

[0011] When the control module controls the voltage doubler rectifier circuit module to operate in the voltage doubler rectifier mode, the gain compensation switch is turned on, and the instantaneous value of the input AC voltage is K2 times the sampling voltage.

[0012] Where R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3 is the resistance value of the third sampling resistor, and K1 = 2. K2.

[0013] Preferably, the gain compensation circuit module is a digital circuit or an analog circuit integrated in the control module. The first input terminal of the control module is connected to the connection line of the first sampling resistor and the second sampling resistor to obtain the instantaneous value of the input AC voltage. When the voltage doubler rectifier circuit module operates in the full-wave rectification mode, the control module controls the gain compensation circuit module to be disabled, and no gain compensation calculation is performed on the instantaneous value of the input AC voltage. When the voltage doubler rectifier circuit module operates in the voltage doubler rectification mode, the control module controls the gain compensation circuit module to be enabled, so as to perform gain compensation calculation on the instantaneous value of the input AC voltage.

[0014] Preferably, the gain compensation circuit module is a digital circuit integrated in the control module. When the gain compensation circuit module is a digital circuit, the instantaneous value of the input AC voltage collected by the input voltage sampling circuit module is converted by an ADC and then divided by 2 by the gain compensation circuit module to obtain the instantaneous value of the input AC voltage after gain compensation.

[0015] Preferably, the control module calculates the maximum value among the instantaneous values ​​of the input AC voltage within a preset time period as the peak value of the input AC voltage.

[0016] Preferably, the voltage doubler rectifier circuit module further includes a bridge circuit, a voltage doubler rectifier switching transistor, a voltage doubler rectifier first capacitor, and a voltage doubler rectifier second capacitor. The input AC voltage is connected through the live wire and neutral wire of the input AC power supply of the voltage doubler rectifier circuit module. The bridge circuit includes a first diode, a second diode, a third diode, and a fourth diode. The first node of the bridge circuit is connected to the cathode of the first diode and the anode of the second diode; the second node of the bridge circuit is connected to the cathode of the second diode and the cathode of the fourth diode; and the third node of the bridge circuit is connected to the cathode of the third diode. The positive terminal of the fourth diode is connected to the positive terminal of the first diode and the positive terminal of the third diode, and the fourth node of the bridge circuit is grounded; the live wire of the input AC power supply is connected to the first node, the neutral wire of the input AC power supply is connected to the third node, the positive terminal of the first voltage doubler rectifier capacitor is connected to the second node, the negative terminal is connected to the positive terminal of the second voltage doubler rectifier capacitor, the negative terminal of the second voltage doubler rectifier capacitor is grounded, one end of the voltage doubler rectifier switch is connected to the first node, and the other end is connected to the line between the first voltage doubler rectifier capacitor and the second voltage doubler rectifier capacitor.

[0017] Preferably, the control module includes an input voltage detection unit, a bus voltage detection unit, a converter detection unit, and a voltage doubler rectifier circuit control unit. The input voltage detection unit is connected to the gain compensation circuit module through a first input terminal of the control module. The bus voltage detection unit is connected to the output terminal of the voltage doubler rectifier circuit module through a second input terminal of the control module. The converter detection unit is connected to the converter module through a first output terminal of the control module. The voltage doubler rectifier circuit control unit is connected to both the gain compensation circuit module and the voltage doubler rectifier circuit module through a second output terminal of the control module. The input voltage detection unit is used to detect the peak value of the input AC voltage at the input terminal of the voltage doubler rectifier circuit module. The bus voltage detection unit is used to detect the peak value of the bus voltage at the output terminal of the voltage doubler rectifier circuit module. The converter detection unit is used to detect the operating mode of the converter module, which includes a low-power mode and a normal operating mode. The voltage doubler rectifier circuit control unit is used to control the gain compensation circuit module and the operating mode of the voltage doubler rectifier circuit module based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module.

[0018] Preferably, controlling the operating mode of the voltage doubler rectifier circuit module based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module includes: if the peak value of the input AC voltage is higher than a first threshold value of the input voltage, then controlling the voltage doubler rectifier circuit module to operate in the full-wave rectification mode; if the peak value of the input AC voltage is lower than a second threshold value of the input voltage, then determining whether the peak value of the bus voltage is greater than or equal to the voltage threshold of the bus overvoltage protection point; if so, then controlling the voltage doubler rectifier circuit module to operate in the full-wave rectification mode; otherwise, determining whether the converter module is in a low-power mode; if so, then controlling the voltage doubler rectifier circuit module to operate in the full-wave rectification mode; otherwise, controlling the voltage doubler rectifier circuit module to operate in the voltage doubler rectification mode.

[0019] The present invention also discloses a power supply control device, the device comprising the voltage doubler rectifier circuit system described in any one of the present invention, to realize power supply voltage doubler rectification control.

[0020] The present invention also discloses a power control chip, wherein the power control chip includes the voltage doubler rectifier circuit system described in any one of the present invention.

[0021] Beneficial effects: The voltage doubler rectifier circuit system of the present invention sets up an input voltage sampling circuit module and a gain compensation circuit module, and the control module controls the working mode of the voltage doubler rectifier circuit module according to the peak value of the input AC voltage, the peak value of the bus voltage and the working mode of the converter module. When the voltage doubler rectifier circuit module works in the voltage doubler rectification mode, the gain compensation circuit module performs gain compensation on the instantaneous value of the collected input AC voltage, so that the control module can calculate the correct peak value of the input voltage.

[0022] The voltage doubler rectifier circuit system designed according to the technical solution of this invention enables existing converter circuits to adapt to global power grid standards when used alone, improving system stability and reliability. Simultaneously, it simplifies design and reduces costs, meeting various application scenarios. It eliminates the need for a PFC boost circuit, reducing the cost of a PFC inductor and freewheeling diode. Its compact size allows for flexible high-voltage output, and compared to using operational amplifiers for differential sampling, it significantly simplifies the sampling circuit and reduces circuit costs.

[0023] Other beneficial effects of the present invention will be explained in detail through the introduction of specific technical features and technical solutions in specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by these technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0024] A preferred embodiment of the voltage doubler rectifier circuit system according to the present invention will now be described with reference to the accompanying drawings. In the drawings: Figure 1 This is a block diagram of a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of an input voltage sampling circuit in the prior art. Figure 3 This is a graph showing the change of input AC voltage with bus voltage detected by the input voltage sampling circuit in the prior art. Figure 4 This is a schematic diagram of an input voltage sampling circuit and a gain compensation circuit according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of an input voltage sampling circuit and a gain compensation circuit according to another preferred embodiment of the present invention; Figure 6 This is a graph showing the input AC voltage as a function of bus voltage detected by the input voltage sampling circuit module according to a preferred embodiment of the present invention. Figure 7 This is a schematic diagram of a voltage doubler rectifier circuit according to a preferred embodiment of the present invention; Figure 8 According to Figure 7Schematic diagram of current flow when medium voltage multiplier rectifier switch S1 is disconnected; Figure 9 According to Figure 7 Schematic diagram of current flow when medium voltage multiplier rectifier switch S1 is turned on; Figure 10 A flowchart illustrating the control module controlling the voltage doubler rectifier circuit module in a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention; Figure 11 This is a block diagram of a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention; Figure 12 This is a schematic diagram of a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention. Figure 13 This is a schematic diagram of a voltage doubler rectifier circuit system according to another preferred embodiment of the present invention. Figure 14 This is a schematic diagram of a voltage doubler rectifier circuit system according to another preferred embodiment of the present invention. Figure 15 This is a schematic diagram of a voltage doubler rectifier circuit system according to another preferred embodiment of the present invention. Detailed Implementation

[0025] To provide a more detailed description of the technical solutions of this application and to facilitate a better understanding of this application, specific embodiments of this application are described below in conjunction with the accompanying drawings. However, it should be understood that all illustrative embodiments and their descriptions are used to explain this application and do not constitute the sole limitation of this application.

[0026] In this application, terms such as "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Figure 1As shown in the figure, a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention includes a voltage doubler rectifier circuit module 100, a converter module 200, an input voltage sampling circuit module 300, a gain compensation circuit module 400, and a control module 500. The input terminals of the voltage doubler rectifier circuit module 100 include a live wire terminal (L) and a neutral wire terminal (N) of the input AC power supply, which are connected to the input AC voltage. The output terminal of the voltage doubler rectifier circuit module 100 is connected to the output of the converter module 200. The input terminal of the input voltage sampling circuit module 300 is connected to the input terminal of the voltage doubler rectifier circuit module 100. The output terminal of the input voltage sampling circuit module 300 is connected to the input terminal of the gain compensation circuit module 400. The output terminal of the gain compensation circuit module 400 is connected to the first input terminal of the control module 500. The voltage doubler rectifier circuit module 100 is used to rectify the input AC voltage to output the bus voltage. The converter module 200 is used to perform DC-DC conversion on the output voltage of the voltage doubler rectifier circuit module 100 to output a DC voltage V. o The input voltage sampling circuit module 300 is used to sample the input voltage of the voltage doubler rectifier circuit module 100 to obtain the instantaneous value V of the input AC voltage. AC_SEN The gain compensation circuit module 400 is used to adjust the instantaneous value V of the input AC voltage. AC_SEN Gain compensation calculation is performed to obtain the instantaneous value of the input AC voltage after gain compensation. The control module 500 is used to calculate the peak value of the input AC voltage based on the instantaneous value of the input AC voltage.

[0028] The second input terminal of the control module 500 is connected to the output terminal of the voltage doubler rectifier circuit module 100 to detect the peak value of the bus voltage output by the voltage doubler rectifier circuit module 100. The first output terminal of the control module is connected to the converter module 200 to control the operating mode of the converter module 200. The second output terminal of the control module 500 is connected to the gain compensation circuit module 400 and the voltage doubler rectifier circuit module 100 to control the operating mode of the converter module 200 based on the peak value of the input AC voltage V. AC_PK The peak bus voltage V BUS_PKThe operating mode of the converter module 200 controls the on / off state of the gain compensation circuit module and the operating mode of the voltage doubler rectifier circuit module 100. The operating modes include full-wave rectification mode and voltage doubler rectification mode. When the voltage doubler rectifier circuit module 100 is in full-wave rectification mode, the gain compensation circuit module 400 does not perform gain compensation processing on the instantaneous value of the input AC voltage output from the input AC voltage sampling module. When the voltage doubler rectifier circuit module 100 is in voltage doubler rectification mode, the gain compensation circuit module 400 performs gain compensation processing on the instantaneous value of the input AC voltage output from the input voltage sampling module to obtain the gain-compensated instantaneous value of the input AC voltage. Full-wave rectification mode typically refers to ordinary filtering and rectification without amplification of the input voltage, while voltage doubler rectification mode typically refers to double voltage rectification. Specifically, the control module 500 can be implemented using any main controller such as a DSP, ARM, or FPGA.

[0029] In traditional technical solutions, for a voltage doubler rectifier circuit, such as Figure 2 As shown, when the voltage doubler rectifier circuit module is in voltage doubler rectification mode, the detected peak input voltage will increase to twice its original value, causing the system to misjudge the peak input voltage. To accurately obtain the AC voltage, the current mainstream solution is to use differential sampling. However, this method requires an operational amplifier, which in turn requires an additional power supply, increasing the complexity and cost of the system design and hindering its widespread adoption.

[0030] The voltage doubler rectifier circuit system of this invention incorporates an input voltage sampling circuit module and a gain compensation circuit module. The control module controls the operating mode of the voltage doubler rectifier circuit module based on the peak input AC voltage, the peak bus voltage, and the converter module's operating mode. When the voltage doubler rectifier circuit module operates in voltage doubler rectification mode, the gain compensation circuit module compensates for the instantaneous value of the acquired input AC voltage, enabling the control module to calculate the correct peak input voltage data. The voltage doubler rectifier circuit system designed according to this invention allows existing converter circuits to adapt to global power grid standards when used alone, improving system stability and reliability. Simultaneously, it simplifies design and reduces costs, meeting various application scenarios. It eliminates the need for a PFC boost circuit, reducing the cost of a PFC inductor and freewheeling diode. Its compact size enables flexible high-voltage output, further simplifying system costs by eliminating the need for operational amplifiers or complex sampling circuits.

[0031] In existing technologies, such as Figure 2 and Figure 7 As shown, when the voltage doubler rectifier circuit (not shown in the figure) operates in voltage doubler rectifier mode, the connection point between diodes D1 and D2 is clamped to V. BUS / 2, this will cause the instantaneous value of the input AC voltage to increase, if adopted Figure 2In traditional input AC voltage detection methods, the peak value of the input AC voltage after rectification by diodes D5 and D6 becomes twice the correct peak value of the input AC voltage, resulting in a misrepresentation of the instantaneous input AC voltage value V. AC_SEN The voltage is too high, which ultimately causes the system to misjudge the peak value of the input AC voltage, such as... Figure 3 As shown, when the voltage doubler rectifier circuit module switches from full-wave rectification mode to voltage doubler rectification mode, the instantaneous value of the input AC voltage V AC_SEN The value was increased to twice its original value, which caused misjudgment of the peak value of the input AC voltage.

[0032] In a preferred embodiment, such as Figure 4 As shown, the input voltage sampling circuit module 300 may include a first sampling diode D5, a second sampling diode D6, a first sampling resistor R1, and a second sampling resistor R2. The anode of the first sampling diode D5 is connected to the neutral input terminal of the voltage doubler rectifier circuit module 100, the anode of the second sampling diode D6 is connected to the live input terminal of the voltage doubler rectifier circuit module 100, the first sampling resistor R1 and the second sampling resistor R2 are connected in series and grounded, and the cathodes of the first sampling diode D5 and the second sampling diode D6 are both connected to one end of the first sampling resistor R1.

[0033] In this embodiment, the first sampling resistor R1 and the second sampling resistor R2 are each a resistor. In other embodiments, the first sampling resistor and the second sampling resistor may also be composed of multiple resistors connected in series and parallel.

[0034] like Figure 4 As shown, the gain compensation circuit module 400 may include a third sampling resistor R3 and a gain compensation switch Q1. The first sampling resistor R1 and the second sampling resistor R2 are connected in series, then connected in series with the third sampling resistor R3 and grounded. One end of the gain compensation switch Q1 is connected to the connection line between the second sampling resistor R2 and the third sampling resistor R3, and the other end is grounded. The first input terminal of the control module 500 is connected to the connection line between the first sampling resistor R1 and the second sampling resistor R2 to obtain the instantaneous value V of the input AC voltage. AC_SEN The second output terminal of the control module 500 is connected to the gain compensation switch Q1, and outputs a control signal G. S1 The gain compensation switch Q1 is turned on and off to control the switching on and off. In specific embodiments, the gain compensation switch Q1 can be implemented using any type of MOSFET, etc., and this invention does not impose any restrictions. When the control module 500 controls the voltage doubler rectifier circuit module 100 to operate in full-wave rectification mode, the gain compensation switch Q1 is turned off, and the instantaneous value of the input AC voltage is K1 times the sampling voltage.

[0035] When the control module 500 controls the voltage doubler rectifier circuit module 100 to operate in voltage doubler rectifier mode, the gain compensation switch Q1 is turned on, and the instantaneous value of the input AC voltage is K2 times the sampling voltage.

[0036] Where R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3 is the resistance value of the third sampling resistor, and K1 = 2. K2.

[0037] Typically, the control signal G S1 The control signal used by the control module 500 to control the voltage doubler rectifier circuit module 100 is the same signal. Therefore, when the voltage doubler rectifier circuit module 100 is controlled by the control module 500 to operate in full-wave rectification mode, the gain compensation switch Q1 is off. When the voltage doubler rectifier circuit module 100 is controlled by the control module 500 to operate in voltage doubler rectification mode, the gain compensation switch Q1 is on, thereby achieving the purpose of gain compensation for the instantaneous value of the input AC voltage.

[0038] In another preferred embodiment, such as Figure 5 As shown, the gain compensation circuit module 400 is a digital circuit integrated into the control module. When the gain compensation circuit module 400 is a digital circuit, the instantaneous value of the input AC voltage collected by the input voltage sampling circuit module 300 is converted by an ADC and then divided by 2 by the gain compensation circuit module 400 to obtain the correct instantaneous value of the input AC voltage. When the gain compensation circuit module 400 is an analog circuit, the gain compensation circuit module 400 includes a voltage divider circuit. The voltage divider circuit performs a voltage divider process on the instantaneous value of the input AC voltage collected by the input voltage sampling circuit module 300 to obtain the correct instantaneous value of the input AC voltage.

[0039] The voltage doubler rectifier circuit system in the above embodiments of the present invention is simple to implement, low in cost, and reduces circuit area. For example... Figure 6 As shown, the instantaneous value V of the input AC voltage is achieved using the voltage doubler rectifier circuit system in the technical solution of this invention. AC_SEN The sampling curve shows that the instantaneous value V of the input AC voltage AC_SEN The voltage was not increased by the use of the voltage doubler rectifier circuit module, thus obtaining the correct instantaneous value of the input AC voltage.

[0040] In a preferred embodiment, the control module can calculate the maximum value among the instantaneous values ​​of the input AC voltage within a preset time period as the peak value V of the input AC voltage. AC_PKSpecifically, the operating frequency range of the power grid is usually 47 to 63 Hz. Therefore, the preset time can be taken as greater than half the reciprocal of the power grid frequency. For example, the preset time can be 20 ms.

[0041] In a preferred embodiment, such as Figure 7 As shown, the voltage doubler rectifier circuit module 100 may further include a bridge circuit, a voltage doubler rectifier switch S1, a voltage doubler rectifier first capacitor C1, and a voltage doubler rectifier second capacitor C2. The input AC voltage is connected through the live wire L and neutral wire N of the input AC power supply of the voltage doubler rectifier circuit module. The bridge circuit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first node A of the bridge circuit is connected to the cathode of the first diode D1 and the anode of the second diode D2. The second node B of the bridge circuit is connected to the cathode of the second diode D2 and the cathode of the fourth diode D4. The third node of the bridge circuit... The third diode D3 is connected to the negative terminal of the fourth diode D4 by connection C. The fourth node D of the bridge circuit is connected to the positive terminals of the first diode D1 and the third diode D3, and grounded. The live wire L of the input AC power supply is connected to the first node A, and the neutral wire N of the input AC power supply is connected to the third node C. The positive terminal of the first voltage doubler rectifier capacitor C1 is connected to the second node B, and the negative terminal is connected to the positive terminal of the second voltage doubler rectifier capacitor C2. The negative terminal of the second voltage doubler rectifier capacitor C2 is grounded. One end of the voltage doubler rectifier switch S1 is connected to the first node A, and the other end is connected to the line between the first voltage doubler rectifier capacitor C1 and the second voltage doubler rectifier capacitor C2. In a specific embodiment, the voltage doubler rectifier switch S1 can be implemented using a relay or a back-to-back MOSFET, etc., and this invention is not limited thereto.

[0042] In a preferred embodiment, when the voltage doubler rectifier switch S1 is closed, the voltage doubler rectifier circuit module 100 operates in voltage doubler rectification mode. When the input is a positive half-wave AC voltage, the current flows through the voltage doubler rectifier switch, the second voltage doubler rectifier capacitor, and the third diode. When the input is a half-wave AC voltage, the current flows through the fourth diode, the first voltage doubler rectifier capacitor, and the voltage doubler rectifier switch. The voltage doubled rectified bus voltage is output through the first voltage doubler rectifier capacitor and the second voltage doubler rectifier capacitor.

[0043] like Figure 8 As shown, when S1 is open, the voltage doubler rectifier circuit operates in full-wave rectification mode, and the circuit system is in normal rectification state. When the input is a positive half-wave AC voltage, the grid current flows through the second diode D2, the first voltage doubler rectifier capacitor C1, the second voltage doubler rectifier capacitor C2, and the filter capacitor C. BUS When the input is the negative half-wave of the AC voltage, the mains current flows through the fourth diode D4, the first voltage doubler rectifier capacitor C1, the second voltage doubler rectifier capacitor C2, and the filter capacitor C.BUS The first diode is D1. At this time, the peak bus voltage is...

[0044] Among them, V AC_RMS This is the effective value of the AC input voltage.

[0045] like Figure 9 As shown, when S1 is closed, the voltage doubler rectifier circuit operates in voltage doubler rectification mode, and the system is in voltage doubler rectification state. When the input is a positive half-wave AC voltage, the grid current flows through the voltage doubler rectifier switch S1, the second voltage doubler rectifier capacitor C2, and the third diode D3. When the input is a half-wave AC voltage, the grid current flows through the fourth diode D4, the first voltage doubler rectifier capacitor C1, and the voltage doubler rectifier switch S1. At this time, the peak value of the terminal voltage of each voltage doubler rectifier capacitor can be regarded as the peak value of the input voltage, that is... At this time, the peak value of the bus voltage is

[0046] Among them, V AC_RMS This represents the effective value of the AC input voltage. It can be seen that after S1 is closed, the peak bus voltage is twice that of normal rectification, achieving a voltage multiplication effect.

[0047] In a preferred embodiment, the control module 500 includes an input voltage detection unit, a bus voltage detection unit, a converter detection unit, and a voltage doubler rectifier circuit control unit. The input voltage detection unit is connected to the gain compensation circuit module through a first input terminal of the control module. The bus voltage detection unit is connected to the output terminal of the voltage doubler rectifier circuit module through a second input terminal of the control module. The converter detection unit is connected to the converter module through a first output terminal of the control module. The voltage doubler rectifier circuit control unit is connected to both the gain compensation circuit module and the voltage doubler rectifier circuit module through a second output terminal of the control module. The input voltage detection unit is used to detect the peak value of the input AC voltage connected to the voltage doubler rectifier circuit module, as a control parameter for the voltage doubler rectifier circuit module. The conditions for the block's operating mode are as follows: The bus voltage detection unit is used to detect the peak value of the bus voltage output by the voltage doubler rectifier circuit module, which serves as a condition for controlling the operating mode of the voltage doubler rectifier circuit module. This can also be called the post-bridge (rear end of the rectifier bridge) voltage detection. The converter detection unit is used to detect the operating mode of the converter module, which includes low-power mode and operating mode, including but not limited to BURST operating mode (also known as hiccup operating mode). The voltage doubler rectifier circuit control unit is used to control the conduction and cutoff of the gain compensation circuit module and the operating mode of the voltage doubler rectifier circuit module based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module. In other words, it makes a decision to control the operating mode of the voltage doubler rectifier circuit module based on the detection information of the above-mentioned parts.

[0048] In a specific implementation, the bus voltage detection unit in the control module 500 can obtain the bus sampled voltage information through resistor voltage division, and then calculate the corresponding bus voltage. The bus voltage is monitored over a period of time, and its maximum value is obtained as the bus voltage peak value V. BUS_PK This time can generally be set to 20ms.

[0049] The converter detection unit is mainly used to detect the converter's operating state, primarily distinguishing between BURSTOFF mode (hiccup shutdown mode, i.e., low-power mode) and non-hiccup mode (operating mode). In BURSTOFF mode, the circuit system and controller typically enter a low-power mode. To reduce overall system power consumption, as many electrical devices as possible are turned off. Therefore, when the system enters a low-power state, the voltage doubler rectifier switch S1 also enters an off state to further reduce losses. In a specific implementation, the operating state of the converter module 200 is usually controlled by the control module 500. If the control module 500 has already stored the operating state data of the converter module 200, the converter detection unit can obtain the operating state of the converter module 200 by reading the data stored in the control module 500. If the control module 500 has not stored the operating state data of the converter module 200, the converter detection unit needs to detect the operating state of the converter module 200; either method is acceptable.

[0050] The voltage doubler rectifier circuit control unit can control the operating mode of the voltage doubler rectifier circuit module by controlling the conduction and disconnection of the voltage doubler rectifier switching transistor in the voltage doubler rectifier circuit module.

[0051] In a preferred embodiment, such as Figure 10 As shown, controlling the operating mode of the voltage doubler rectifier circuit module based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating state of the converter module may include: if the peak value of the input AC voltage V AC_PK Above the first threshold voltage V AC_H Then, the voltage doubler rectifier circuit module 100 is in full-wave rectification mode (S1 is open). If the peak value of the input AC voltage V AC_PK Below the second threshold V of the input voltage AC_L Then determine the peak bus voltage V BUS_PK Is it greater than or equal to the voltage threshold V of the bus overvoltage protection point? BUS_OV If yes, the voltage doubler rectifier circuit module 100 is controlled to be in full-wave rectification mode (S1 open); otherwise, it is determined whether the converter module 200 is in low-power mode (e.g., BURST OFF mode). If yes, the voltage doubler rectifier circuit module 100 is controlled to be in full-wave rectification mode (S1 open); otherwise, the voltage doubler rectifier circuit module 100 is controlled to be in voltage doubler rectification mode (S1 closed).

[0052] V AC_L and V AC_H It is the dividing line used to distinguish between high-voltage and low-voltage power grids, V AC_L and V AC_HThe voltage can usually be set according to the needs of the circuit system, and is generally selectable between 115 and 220V. For example, V AC_L Set to 160V, V AC_H Set to 180V, equivalent to 20V hysteresis, to avoid switching back and forth. V AC_L and V AC_H This is the value used to determine the high or low state of the input AC voltage. When the peak value of the input AC voltage is greater than V... AC_H When the input voltage is high enough, it means that there is no need to close the voltage doubler rectifier switch S1. When the peak input voltage is lower than V... AC_L If the input voltage is too low, it means that the input voltage is too low. At this time, it is necessary to further determine whether to close the voltage doubler rectifier switch S1 based on the bus voltage and the converter operating mode.

[0053] V BUS_OV Generally, the stress is determined by the components used in the circuit, such as the stress of the MOSFETs in the converter module, and the stress of the first capacitor, second capacitor, and filter capacitor in the voltage doubler rectifier circuit. For example, V BUS_OV Set to 450V. When the detected peak bus voltage exceeds V... BUS_OV When an overvoltage condition occurs, the voltage doubler rectifier switch S1 needs to be disconnected to prevent the MOSFETs of the converter from being damaged due to excessive bus voltage. If no overvoltage condition occurs, the decision to close the voltage doubler rectifier switch S1 depends on the operating status of the converter module.

[0054] When the system is in BURST OFF mode, the voltage doubler rectifier switch S1 needs to be disconnected to reduce the losses in the S1 section, so that the system can obtain a standby state with lower losses.

[0055] In a preferred embodiment, the converter module may include an LLC converter or an AHB converter, or other power electronic converters.

[0056] The present invention also discloses a power control device, the device comprising the voltage doubler rectifier circuit system described in any one of the present invention, for realizing power output control.

[0057] The present invention also discloses a power control chip, wherein the power control chip includes the voltage doubler rectifier circuit system described in any one of the present invention to realize power output control.

[0058] Figure 11The circuit diagram of a voltage doubler rectifier circuit system according to a preferred embodiment of the present invention includes a voltage doubler rectifier circuit module 100, a converter module 200, an input voltage sampling circuit module 300, a gain compensation circuit module 400, and a control module 500. The voltage doubler rectifier circuit module 100 includes a bridge circuit composed of diodes D1-D4, a voltage doubler rectifier switch S1, and voltage doubler rectifier capacitors C1 and C2. The converter module 200 can be an LLC converter or an AHB converter, etc., and the present invention is not limited thereto. The input voltage sampling circuit module 300 includes a sampling capacitor C3, sampling diodes D5 and D6, and sampling resistors R1-R2. The gain compensation circuit module 400 includes a resistor R3 and a gain compensation switch Q1. GS1 is the switching control signal output by the control module 500. AC_SEN The input AC voltage instantaneous value is used. The control module 500 includes an input detection unit (input voltage detection unit), a bus detection unit (bus voltage detection unit), a converter status detection unit (converter detection unit), and a switch control unit (voltage doubler rectifier circuit module control unit). The input detection unit can calculate the instantaneous value V of the input AC voltage within a preset time (e.g., 20ms). AC_SEN The maximum value, which is the peak value of the input AC voltage V. AC_PK The bus detection unit detects the peak bus voltage V output by the voltage doubler rectifier circuit module 100 through a resistor voltage divider. BUS_PK The converter status detection unit can detect the working status of the converter module 200. When the control module 500 detects that the peak value of the input AC voltage is lower than the second threshold value of the input voltage, the peak value of the bus voltage is not greater than the voltage threshold value of the bus overvoltage protection point, and the converter module is not in low power mode, the control module 500 controls the voltage doubler rectifier switch S1 in the voltage doubler rectifier circuit module 100 to be turned on, so that the voltage doubler rectifier circuit module 100 is in the voltage doubler rectification working mode.

[0059] Figures 12-15The schematic diagram of the voltage doubler rectifier circuit system designed according to the technical solution of the present invention includes a voltage doubler rectifier circuit module 100, a converter module 200, an input voltage sampling circuit module 300, a gain compensation circuit module 400, and a control module 500. In the voltage doubler rectifier circuit module 100, the switching transistor S1 is a relay. The input voltage sampling circuit module 300 includes a capacitor, two diodes, and two resistors. The gain compensation circuit module 400 includes a resistor and a switching transistor. U1 is a chip with the function of controlling the voltage doubler rectifier circuit, i.e., the control module 500 (U1). Here, GS is the voltage doubler rectifier control signal pin, ACIN is the input AC voltage information acquisition pin, VBUS is the bus voltage information acquisition pin, HV is the high-voltage start pin of the high-voltage chip, VCC is the chip power supply pin, ZCD is the chip auxiliary winding detection pin, FB is the chip closed-loop feedback pin, GH / BST / HB / GL are drive-related pins, CS is the current detection pin, and OTP is the external over-temperature detection pin. Figure 12 and Figure 13 In this circuit, the gain compensation circuit module 400 is designed externally to U1. Figure 14 and Figure 15 In this circuit, the gain compensation circuit module 400 is integrated inside U1. Figure 12 and Figure 14 In the voltage doubler rectifier circuit module, the switching transistor S1 is implemented by a relay. Figure 13 and Figure 15 In the voltage doubler rectifier circuit module, the switching transistor S1 is implemented using a back-to-back MOSFET.

[0060] Those skilled in the art will understand that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0061] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. A voltage doubler rectifier circuit system, characterized in that, include: The voltage doubler rectifier circuit module is used to rectify the input AC voltage to produce the output bus voltage. The converter module is used to perform DC-DC conversion on the output voltage of the voltage doubler rectifier circuit module to output a DC voltage. The input voltage sampling circuit module is used to sample the input voltage of the voltage doubler rectifier circuit module to obtain the instantaneous value of the input AC voltage. The gain compensation circuit module is used to perform gain compensation on the obtained instantaneous value of the input AC voltage. The control module is used to calculate the peak value of the input AC voltage and the peak value of the bus voltage based on the instantaneous value of the input AC voltage output from the gain compensation circuit module and the bus voltage. Based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module, the control module controls the switching on and off of the gain compensation circuit module, as well as the operating mode of the voltage doubler rectifier circuit module. The voltage doubler rectifier circuit module has two operating modes: full-wave rectification mode and voltage doubler rectification mode. When in full-wave rectification mode, the gain compensation circuit module does not perform gain compensation processing. When in voltage doubler rectification mode, the gain compensation circuit module performs gain compensation processing to obtain the instantaneous value of the input AC voltage after gain compensation.

2. The voltage doubler rectifier circuit system according to claim 1, characterized in that, The input voltage sampling circuit module includes a first sampling diode, a second sampling diode, a first sampling resistor, and a second sampling resistor. The anode of the first sampling diode is connected to the neutral terminal of the AC power input of the voltage doubler rectifier circuit module, the anode of the second sampling diode is connected to the live terminal of the AC power input of the voltage doubler rectifier circuit module, the first sampling resistor and the second sampling resistor are connected in series and grounded, and the cathodes of the first sampling diode and the second sampling diode are both connected to one end of the first sampling resistor.

3. The voltage doubler rectifier circuit system according to claim 2, characterized in that, The gain compensation circuit module includes a third sampling resistor and a gain compensation switch. The first sampling resistor and the second sampling resistor are connected in series, and then connected in series with the third sampling resistor and grounded. One end of the gain compensation switch is connected to the connection line of the second sampling resistor and the third sampling resistor, and the other end is grounded. The first input terminal of the control module is connected to the connection line of the first sampling resistor and the second sampling resistor to obtain the instantaneous value of the input AC voltage. The second output terminal of the control module is connected to the gain compensation switch to control the gain compensation switch to be turned on and off according to the peak value of the input AC voltage, the peak value of the bus voltage and the working mode of the converter module. When the control module controls the voltage doubler rectifier circuit module to operate in the full-wave rectification mode, the gain compensation switch is turned off, and the instantaneous value of the input AC voltage is K1 times the sampling voltage. When the control module controls the voltage doubler rectifier circuit module to operate in the voltage doubler rectifier mode, the gain compensation switch is turned on, and the instantaneous value of the input AC voltage is K2 times the sampling voltage. Where R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3 is the resistance value of the third sampling resistor, and K1 = 2. K2.

4. The voltage doubler rectifier circuit system according to claim 2, characterized in that, The first input terminal of the control module is connected to the connection line of the first sampling resistor and the second sampling resistor to obtain the instantaneous value of the input AC voltage; When the voltage doubler rectifier circuit module operates in the full-wave rectification mode, the control module controls the gain compensation circuit module to be disabled, and no gain compensation calculation is performed on the instantaneous value of the input AC voltage. When the voltage doubler rectifier circuit module operates in the voltage doubler rectification mode, the control module controls the gain compensation circuit module to be enabled, so as to perform gain compensation calculation on the instantaneous value of the input AC voltage.

5. The voltage doubler rectifier circuit system according to claim 1, characterized in that, The gain compensation circuit module is a digital circuit integrated in the control module. When the gain compensation circuit module is a digital circuit, the instantaneous value of the input AC voltage collected by the input voltage sampling circuit module is converted by the ADC and then divided by 2 by the gain compensation circuit module to obtain the instantaneous value of the input AC voltage after gain compensation.

6. The voltage doubler rectifier circuit system according to claim 1, characterized in that, The control module calculates the maximum value among the instantaneous values ​​of the input AC voltage within a preset time period as the peak value of the input AC voltage.

7. The voltage doubler rectifier circuit system according to claim 1, characterized in that, The voltage doubler rectifier circuit module also includes a bridge circuit, a voltage doubler rectifier switching transistor, a voltage doubler rectifier first capacitor, and a voltage doubler rectifier second capacitor. The input AC voltage is connected through the live wire and neutral wire of the input AC power supply of the voltage doubler rectifier circuit module. The bridge circuit includes a first diode, a second diode, a third diode, and a fourth diode; The first node of the bridge circuit is connected to the negative terminal of the first diode and the positive terminal of the second diode; the second node of the bridge circuit is connected to the negative terminal of the second diode and the negative terminal of the fourth diode; the third node of the bridge circuit is connected to the negative terminal of the third diode and the positive terminal of the fourth diode; and the fourth node of the bridge circuit is connected to the positive terminal of the first diode and the positive terminal of the third diode, and is grounded. The live wire of the input AC power supply is connected to the first node, and the neutral wire of the input AC power supply is connected to the third node. The positive terminal of the first voltage doubler rectifier capacitor is connected to the second node, and the negative terminal is connected to the positive terminal of the second voltage doubler rectifier capacitor. The negative terminal of the second voltage doubler rectifier capacitor is grounded. One end of the voltage doubler rectifier switch is connected to the first node, and the other end is connected to the line between the first voltage doubler rectifier capacitor and the second voltage doubler rectifier capacitor.

8. The voltage doubler rectifier circuit system according to claim 1, characterized in that, The control module includes an input voltage detection unit, a bus voltage detection unit, a converter detection unit, and a voltage doubler rectifier circuit control unit. The input voltage detection unit is connected to the gain compensation circuit module through the first input terminal of the control module; the bus voltage detection unit is connected to the output terminal of the voltage doubler rectifier circuit module through the second input terminal of the control module; the converter detection unit is connected to the converter module through the first output terminal of the control module; and the voltage doubler rectifier circuit control unit is connected to both the gain compensation circuit module and the voltage doubler rectifier circuit module through the second output terminal of the control module. The input voltage detection unit is used to detect the peak value of the input AC voltage at the input terminal of the voltage doubler rectifier circuit module; The bus voltage detection unit is used to detect the peak value of the bus voltage at the output terminal of the voltage doubler rectifier circuit module; The converter detection unit is used to detect the operating mode of the converter module, which includes a low-power mode and a normal operating mode. The voltage doubler rectifier circuit control unit is used to control the gain compensation circuit module and the operating mode of the voltage doubler rectifier circuit module according to the peak value of the input AC voltage, the peak value of the bus voltage and the operating mode of the converter module.

9. The voltage doubler rectifier circuit system according to claim 8, characterized in that, Controlling the operating mode of the voltage doubler rectifier circuit module based on the peak value of the input AC voltage, the peak value of the bus voltage, and the operating mode of the converter module includes: If the peak value of the input AC voltage is higher than the first threshold value of the input voltage, the voltage doubler rectifier circuit module is controlled to operate in the full-wave rectification mode. If the peak value of the input AC voltage is lower than the second threshold value of the input voltage, it is determined whether the peak value of the bus voltage is greater than or equal to the voltage threshold value of the bus overvoltage protection point. If so, the voltage doubler rectifier circuit module is controlled to operate in the full-wave rectification mode. Otherwise, it is determined whether the converter module is in the low-power mode. If so, the voltage doubler rectifier circuit module is controlled to operate in the full-wave rectification mode. Otherwise, the voltage doubler rectifier circuit module is controlled to operate in the voltage doubler rectification mode.

10. A power control device, characterized in that, The device includes a voltage doubler rectifier circuit system as described in any one of claims 1-9 to achieve power supply voltage doubler rectification control.

11. A power control chip, characterized in that, The power control chip includes the voltage doubler rectifier circuit system as described in any one of claims 1-9.

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