Integration circuit for ACDC driving power supply, power supply, chip and electronic equipment
By employing a variable impedance sub-circuit and a pF-level capacitor in the integration circuit design of the AC-DC drive power supply, the high cost problem in the prior art is solved, and the effects of high power factor and low loop bandwidth are achieved, while reducing the number of components and system complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-19
AI Technical Summary
Existing AC-DC drive power supplies are costly to achieve high power factor and low loop bandwidth. Current technologies often employ large off-chip capacitors or digital integration, which increases cost and system complexity.
An integrator circuit design using a variable impedance sub-circuit and a pF-level capacitor is employed. The error between the current detection signal and the reference voltage signal is calculated by a transconductance amplifier and integrated. The bandwidth of the control loop is adjusted by combining the variable impedance sub-circuit, thus avoiding the use of external capacitors and digital integrators.
It achieves high power factor and low loop bandwidth while reducing the number of components and cost, simplifying the structure and reducing system complexity.
Smart Images
Figure CN224264954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic power chip design technology, and in particular to an integrating circuit for an ACCDC drive power supply, an ACCDC drive power supply, a chip, and an electronic device. Background Technology
[0002] For AC / CDC (Alternating Current / Direct Current) high power factor (PF) drivers, a high PF requires a relatively low loop bandwidth. Current technologies often employ large off-chip capacitors around the driver chip, or use digital integration instead of off-chip integrating capacitors, to achieve high PF and low loop bandwidth in AC / CDC drivers. However, research has shown that both of these methods are relatively expensive.
[0003] It should be noted that the information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be regarded as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content
[0004] The purpose of this invention is to address the high cost of existing AC-CDC drive power supplies in achieving high power factor (PF) and low loop bandwidth. This invention provides an integrating circuit, AC-CDC drive power supply, chip, and electronic device for AC-CDC drive power supplies. This invention not only achieves high PF and low loop bandwidth well, but also has the advantages of simple structure, few components, and low cost.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrating circuit for an ACCDC drive power supply, wherein the ACCDC drive power supply includes a transconductance amplifier, the non-inverting input terminal of the transconductance amplifier receives a reference voltage signal, and the negative-inverting input terminal receives a current detection signal output by the ACCDC drive power supply; the integrating circuit includes a variable impedance sub-circuit and a first capacitor; the first terminal of the variable impedance sub-circuit is coupled to the output terminal of the transconductance amplifier, and the common connection point between the second terminal of the variable impedance sub-circuit and the first terminal of the first capacitor is used to output an integrating signal, the integrating signal participating in the control loop of the ACCDC drive power supply, and the second terminal of the first capacitor is connected to a reference ground;
[0006] The variable impedance sub-circuit is used to adjust the bandwidth of the control loop according to the frequency of the received control signal.
[0007] Optionally, the control signal includes two non-overlapping timing signals; the variable impedance sub-circuit includes a first switching unit, a second switching unit, and a second capacitor; a first terminal of the first switching unit is coupled to the output terminal of the transconductance amplifier, a second terminal of the first switching unit, a first terminal of the second capacitor, and a first terminal of the second switching unit are coupled together, a second terminal of the second capacitor is connected to a reference ground, and a second terminal of the second switching unit is coupled to the common contact point; the control terminals of the first switching unit and the second switching unit respectively receive the timing signals;
[0008] The first switching unit and the second switching unit are used to alternately turn on and off according to the received timing signal.
[0009] Optionally, the first switching unit and / or the second switching unit includes a switching element.
[0010] Optionally, the integrator circuit further includes a non-overlapping timing control circuit, wherein the input terminal of the non-overlapping timing control circuit is used to receive the control signal, and the output terminal of the non-overlapping timing control circuit is used to output the non-overlapping timing signal.
[0011] Optionally, the non-overlapping timing control circuit is further configured to control the frequency of the output non-overlapping timing signal during the steady-state establishment of the ACDC drive power supply to be greater than the frequency after the ACDC drive power supply has established a steady state.
[0012] Optionally, the integrating circuit further includes a zero-adjustment sub-circuit, the first terminal of which is coupled to the common contact point, the second terminal of which is coupled to the reference ground, and the control terminal of which receives a zero-adjustment control signal.
[0013] The zero-adjustment sub-circuit is used to adjust the zero-point distribution of the ACCDC drive power supply according to the received zero-adjustment control signal.
[0014] Optionally, the zero-adjustment sub-circuit includes a third switching unit, a fourth switching unit, a third capacitor, and a fourth capacitor; the first terminal of the third switching unit is coupled to the common contact point, the second terminal of the third switching unit, the first terminal of the third capacitor, and the first terminal of the fourth switching unit are coupled together, the second terminal of the fourth switching unit is coupled to the first terminal of the fourth capacitor, and the control terminals of the third and fourth switching units are used to receive the zero-adjustment control signal; the second terminals of the third and fourth capacitors are coupled to a reference ground.
[0015] To achieve the above objectives, the present invention also provides an AC / CDC drive power supply, wherein the AC / CDC drive power supply includes the integrating circuit described in any of the above claims.
[0016] To achieve the above objectives, the present invention also provides a chip, wherein the chip integrates the integrating circuit for AC / DC drive power supply described in any of the above claims, or the chip integrates the AC / DC drive power supply described above.
[0017] To achieve the above objectives, the present invention also provides an electronic device, which includes the integrator circuit described in any of the above claims, or the AC-DC drive power supply described in the above claims, or the chip described in the above claims.
[0018] Compared with the prior art, the integrating circuit, AC / DC drive power supply, chip, and electronic equipment provided by this utility model have the following advantages:
[0019] The present invention provides an integrating circuit for an AC-CDC drive power supply, comprising a variable impedance sub-circuit and a first capacitor. On one hand, the variable impedance sub-circuit can charge and discharge the first capacitor based on the error between the current detection signal calculated by the transconductance amplifier and the reference voltage signal, forming an integrating stage, thereby achieving high pF and low loop bandwidth. On the other hand, the variable impedance sub-circuit can also adjust the pole positions of the control loop according to the received control signal, thereby adjusting the bandwidth of the control loop of the AC-CDC drive power supply. Furthermore, the capacitance of the first capacitor is only in the pF range, which can be directly integrated onto the AC-CDC drive power supply chip, eliminating the need for additional surface-mount capacitors and corresponding peripheral circuits, thus reducing the area of the AC-CDC drive power supply; it also eliminates the need for an AD converter, digital integrator, and DA converter, effectively reducing costs. In summary, the present invention not only achieves high pF and low loop bandwidth effectively, but also has the advantages of simple structure, few components, and low cost.
[0020] The AC-CDC drive power supply, chip, and electronic device provided by this utility model belong to the same inventive concept as the integrating circuit for AC-CDC drive power supply provided by this utility model. Therefore, the AC-CDC drive power supply, chip, and electronic device provided by this utility model have at least all the advantages of the integrating circuit for AC-CDC drive power supply provided by this utility model. To avoid redundancy, further explanation is not provided here. For more detailed information, please refer to the above description of the beneficial effects of the integrating circuit for AC-CDC drive power supply provided by this utility model. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of one type of AC-DC drive power supply in the prior art;
[0022] Figure 2 This is a schematic diagram of the structure of the first integrator used in the prior art for AC-DC drive power supplies;
[0023] Figure 3 This is a schematic diagram of the structure of a second type of integrator used in existing ACDC drive power supplies;
[0024] Figure 4 A structural block diagram of an integrating circuit for an ACDC drive power supply provided in an embodiment of this utility model;
[0025] Figure 5a A schematic diagram of the circuit topology of an integrating circuit for an AC-CDC drive power supply provided in Embodiment 1 of this utility model.
[0026] Figure 5b For use in control Figure 5a The timing diagram shows the non-overlapping timing signals of the first and second switching units.
[0027] Figure 5c for Figure 5a A schematic diagram of the circuit structure of the switching elements used in the first switching unit and / or the second switching unit;
[0028] Figure 6 This is a structural block diagram of an integrating circuit for an ACDC drive power supply provided in Embodiment 2 of the present invention;
[0029] Figure 7a for Figure 6 A schematic diagram of the circuit topology of the overlapping timing control circuit between China and Africa;
[0030] Figure 7b for Figure 7a Timing diagram of the non-overlapping timing signals output by the non-overlapping timing control circuit;
[0031] Figure 8 This is a structural block diagram of an integrating circuit for an ACDC drive power supply provided in Embodiment 3 of this utility model;
[0032] Figure 9 A schematic diagram of the circuit topology of an integrating circuit for an AC / DC drive power supply provided in Embodiment 3 of this utility model.
[0033] The reference numerals in the attached figures are as follows:
[0034] Drive power supply circuit - 100; Integrator - 110, Transconductance amplifier - 111, Surface mount capacitor - C0; AD converter - 112, DA converter - 113, Digital integrator - 114; Variable impedance sub-circuit - 121, First capacitor - C1, First switching unit - S1, Second switching unit - S2, Second capacitor - C2; Non-overlapping timing control circuit - 122; Zero adjustment sub-circuit - 123, Third switching unit - S3, Fourth switching unit - S4, Third capacitor - C3, Fourth capacitor - C4; General interface circuit - 200; Power conversion circuit - 300, Power switching transistor - SW; LED load - 400;
[0035] Current detection signal - Vcs, error voltage - Vea0, integral signal - Vea, timing signals - P1, P2; zeroing control signals - P3, P4. Detailed Implementation
[0036] The following detailed description, in conjunction with the accompanying drawings, provides a further detailed account of the integrating circuit, AC / DC drive power supply, chip, and electronic device provided by this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clarify the illustration of the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes and to enable those skilled in the art to understand and read them, and are not intended to limit the implementation conditions of this utility model. Any modifications to the structure, changes in proportions, or adjustments to the size, provided that the effects and objectives achieved by this utility model are the same or similar, should still fall within the scope of the technical content disclosed in this utility model. Specific design features of this utility model disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different figures to denote the same parts or parts having the same function, and their repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0037] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0038] It should be understood that in the description of this utility model, unless otherwise expressly specified and limited, when a component is referred to as "connected," "connected to," or "coupled" to other components, it may be directly connected to other components, or there may be an intermediary component. Conversely, when a component is referred to as "directly connected" or "directly connected to" other components, there is no intermediary component.
[0039] To facilitate understanding of this utility model, before providing a detailed description of the specific embodiments of the integrating circuit, AC / DC drive power supply, chip, and electronic equipment provided by this utility model, the main research process for proposing this utility model is briefly described as follows:
[0040] For example, please see Figure 1 , Figure 1 This is a schematic diagram of the structure of one type of existing ACDC drive power supply. More specifically, Figure 1 An example of a power supply driving a Buck PFC LED (Light Emitting Diode). From Figure 1 As can be seen, the AC / DC driver power supply includes a driver power supply circuit 100 electrically connected to the AC side, a general interface circuit 200 coupled to the AC side, and a power conversion circuit 300 coupled to the LED load 400. The driver power supply circuit 100 drives the power conversion circuit 300. Typically, the driver power supply circuit 100 is integrated on the driver power supply chip. To ensure constant current output of the AC / DC driver power supply and improve system stability, the driver power supply circuit 100 typically includes an integrator 110. For example, as... Figure 1 As shown, the integrator 110 outputs an integral signal Vea based on the detected current detection signal Vcs and the reference voltage signal Vref2 to adjust the PWM duty cycle or switching frequency, thereby enabling the power conversion circuit 300 to provide constant current to the LED load 400.
[0041] like Figure 1As shown, in the field of LED lighting, a high power factor power conversion circuit 300 can reduce total harmonic distortion and extend circuit life. However, in existing high power factor solutions, a large amount of energy is lost in circuit components (such as power switching transistors SW and resistors), resulting in reduced efficiency; the input current waveform deviating from a sine wave brings a large amount of harmonic distortion, leading to a decrease in power factor.
[0042] As described in the background section, in order to optimize efficiency and power factor, existing technologies often employ the placement of large off-chip capacitors around the driver power supply chip. For example, please refer to... Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of the structure of a first integrator 110 used in existing ACDC drive power supplies. Figure 2 It can be seen that in this scheme, the real-time current of the power switch SW of the power conversion circuit 300 is used as the feedback quantity (i.e., the current detection signal Vcs). Figure 1 In the power conversion circuit 300, the sampling point of the current detection signal (marked by CS) is sent to the transconductance amplifier 111. The transconductance amplifier 111 calculates the error between the current detection signal Vcs and the reference voltage signal Vref2, and converts the voltage signal into an integral signal based on this error to charge and discharge the surface-mount capacitor C0, obtaining the error voltage Vea0, thereby changing the operating state of the AC-CDC drive power supply. However, this method of generating the error voltage Vea0 requires a capacitor with a large capacitance. To achieve a low-pass effect, the capacitor needs to be in the μF (microfarad) range. As mentioned earlier, the drive power supply circuit 100 is usually integrated on the drive power supply chip, but the drive power supply chip cannot integrate μF-level capacitors. Therefore, this solution requires the introduction of a large number of complex circuits and the addition of surface-mount capacitor C0 in the peripheral application system. The introduction of a large number of complex circuits increases the cost, thereby increasing the cost of the system (such as an LED system using this AC-CDC drive power supply). In addition, the lifespan of the surface-mount capacitor C0 will also affect the operating time of the system.
[0043] Further, please see Figure 3 , Figure 3 This is a schematic diagram of a second type of integrator 110 used in existing ACDC drive power supplies. This design uses digital integration instead of an external integrating capacitor. Figure 3As shown, in this scheme, the real-time current of the power switch SW of the power conversion circuit 300 is used as the feedback quantity (i.e., the current detection signal Vcs) and sent to the transconductance amplifier 111. The transconductance amplifier 111 calculates the error between the current detection signal Vcs and the reference voltage signal Vref2, and converts the error signal into a digital signal through the AD converter 112. Then, the digital integrator 114 performs addition and subtraction processing on the converted digital signal to finally obtain a stable digital code, which is then sent to the DA converter 113 to output the error voltage Vea0. Although this scheme can avoid the need for an external surface-mount capacitor C0, the chip cost will increase due to the complex design of the AD converter 112, DA converter 113, and digital integrator.
[0044] Based on the above research, and addressing the issue of high cost in existing AC-CDC drive power supplies when achieving high power factor (PF) and low loop bandwidth, the core idea of this invention is to provide an integrating circuit, AC-CDC drive power supply, chip, and electronic device for AC-CDC drive power supplies. This invention not only effectively achieves high PF and low loop bandwidth but also has the advantages of simple structure, fewer components, and low cost.
[0045] The integrating circuit and chip for AC / CDC drive power supply provided by this utility model can be used in the AC / CDC drive power supply and electronic devices provided by this utility model.
[0046] To achieve the above-mentioned goals, this invention provides an integrating circuit for AC-DC drive power supplies. For an example, please refer to... Figure 1 and Figure 4 , Figure 4 This is a structural block diagram of an integrating circuit for an AC / DC drive power supply provided by this utility model. From... Figure 1 As can be seen from the preceding description, the ACDC drive power supply includes a transconductance amplifier 111. The non-inverting input terminal of the transconductance amplifier 111 receives a reference voltage signal Vref2, and the negative-inverting input terminal receives a current detection signal Vcs output by the ACDC drive power supply. Figure 1 In the power conversion circuit 300, the node for acquiring real-time current is marked by CS, and the acquired real-time current is used as the current detection signal Vcs; furthermore, combined with Figure 1 and Figure 4 As can be understood from the preceding description, the integrating circuit for the AC / DC drive power supply provided by this utility model is positioned in the AC / DC drive power supply as follows: Figure 1 As shown in the red box. Please see below. Figure 4 ,from Figure 4As can be seen, the integrating circuit provided by this utility model includes a variable impedance sub-circuit 121 and a first capacitor C1; the first terminal of the variable impedance sub-circuit 121 is coupled to the output terminal of the transconductance amplifier 111 (in the figure, it is indicated by the differential signal Vo output by the transconductance amplifier 111); the common connection point between the second terminal of the variable impedance sub-circuit 121 and the first terminal of the first capacitor C1 is used to output an integrating signal Vea, which participates in the control loop of the ACDC drive power supply; the second terminal of the first capacitor C1 is connected to reference ground. The variable impedance sub-circuit 121 is used to adjust the bandwidth of the control loop according to the frequency of the received control signal.
[0047] Therefore, the integrating circuit for an AC / DC drive power supply provided by this invention includes a variable impedance sub-circuit 121 and a first capacitor C1. On the one hand, the variable impedance sub-circuit 121 can charge and discharge the first capacitor C1 according to the error between the current detection signal Vcs calculated by the transconductance amplifier 111 and the reference voltage signal Vref, forming an integrating stage, thereby achieving high pF and low loop bandwidth. On the other hand, the variable impedance sub-circuit 121 can also adjust the pole position of the control loop according to the received control signal, thereby adjusting the bandwidth of the control loop of the AC / DC drive power supply. Furthermore, the capacitance of the first capacitor C1 is only in the pF range, which can be directly integrated on the AC / DC drive power supply chip without adding a surface-mount capacitor C0 and corresponding peripheral circuits to the AC / DC drive power supply, thus reducing the area of the AC / DC drive power supply; and it also eliminates the need to add an AD converter 112, a digital integrator 114, and a DA converter 113, thereby effectively reducing costs. In summary, this invention not only achieves high pF and low loop bandwidth, but also has the advantages of simple structure, few components, and low cost.
[0048] It should be noted that those skilled in the art should understand that the present invention does not impose excessive limitations on the specific implementation of the variable impedance sub-circuit 121. The variable impedance sub-circuit 121 can adopt a design method including, but not limited to, the design method of using a first switching unit S1, a second switching unit S2, and a second capacitor C2 as exemplified in Embodiment 1 below, as well as an impedance transformer design method, etc. For more detailed information on implementing the variable impedance sub-circuit 121 using the first switching unit S1, the second switching unit S2, and the second capacitor C2, please refer to the description of Embodiment 1 below, which will not be elaborated here. In particular, when the variable impedance sub-circuit 121 is implemented using the first switching unit S1, the second switching unit S2, and the second capacitor C2, the control signal includes two non-overlapping timing signals. Furthermore, the present invention does not limit the way the control signal is provided. For example, it can adopt a non-overlapping timing control circuit based on logic gate combination as exemplified in Embodiment 2 below, as well as a non-overlapping timing control circuit based on flip-flops, dedicated clock management chips, or programmable logic devices, etc. This article only provides an example of a non-overlapping timing control circuit based on logic gate combinations. For more detailed information, please refer to the description of Embodiment 2 below, which will not be elaborated here. Furthermore, the integrating circuit for the ACCDC drive power supply provided by this utility model may also include a zero-adjustment sub-circuit to achieve the required distribution of zeros and poles in the system where the ACCDC drive power supply is located. For more detailed information, please refer to the description of Embodiment 3 below.
[0049] Example 1
[0050] For example, please see Figure 5a and Figure 5b , Figure 5a This is a schematic diagram of the circuit topology of an integral circuit for an AC-CDC drive power supply provided in this embodiment. Figure 5b For use in control Figure 5a The timing diagram shown is for the non-overlapping timing signals of the first switching unit S1 and the second switching unit S2. From... Figure 5a As can be seen, the integrating circuit for the AC / DC drive power supply provided in this embodiment includes a variable impedance sub-circuit 121 comprising a first switching unit S1, a second switching unit S2, and a second capacitor C2; the first terminal of the first switching unit S1 is coupled to the output terminal of the transconductance amplifier 111, the second terminal of the first switching unit S1, the first terminal of the second capacitor C2, and the first terminal of the second switching unit S2 are coupled together, the second terminal of the second capacitor C2 is connected to a reference ground, and the second terminal of the second switching unit S2 is coupled to the common contact point (…). Figure 5a(Not shown in the text); the control terminals of the first switching unit S1 and the second switching unit S2 respectively receive the timing signals (for ease of description and understanding, Figure 5a and Figure 5b In the diagram, the timing signal received by the first switching unit S1 is represented by P1, and the timing signal received by the second switching unit S2 is represented by P2. The first switching unit S1 and the second switching unit S2 are used to alternately turn on and off according to the received timing signal.
[0051] The integrating circuit for AC / DC drive power supply provided by this utility model includes a variable impedance sub-circuit 121 comprising a first switching unit S1, a second switching unit S2, and a second capacitor C2. This configuration not only facilitates the integration of the AC / DC drive power supply into a drive power supply chip, significantly reducing the occupied area and requiring fewer components, thus significantly reducing costs, but also allows for flexible adjustment of the switching frequencies of non-overlapping timing signals P1 and P2. This controls the on and off states of the first switching unit S1 and the second switching unit S2 to cope with loop changes in the system containing the AC / DC drive power supply, thereby effectively achieving high power factor (PF) and low loop bandwidth.
[0052] Next, combined Figure 5a and Figure 5b The working principle of the integrating circuit for AC / DC drive power supply provided by this utility model is briefly described as follows:
[0053] like Figure 5a As shown, the first switching unit S1, the second switching unit S2, the first capacitor C1, and the second capacitor C2 constitute a switched capacitor network. The equivalent resistance formed by the first switching unit S1, the second switching unit S2, and the second capacitor C2 can be calculated using the following formula (1):
[0054]
[0055] In equation (1), Req is the equivalent impedance value, Vo is the differential signal output by the transconductance amplifier 111, Vea is the integral signal, fs is the frequency of the non-overlapping timing signals P1 and P2, and C2 is the capacitance value of the second capacitor C2.
[0056] For example, suppose in a certain example the equivalent impedance value req is 440MΩ and the harmonic frequency fp of the AC-CDC drive power supply is 24Hz, according to the following equation (2):
[0057]
[0058] The capacitance value of the first capacitor C1 can be calculated to be 14.7 pF (picofarads). It can be seen that compared with the micrometer-level chip capacitor C0 required in the prior art, the first capacitor C1 required by the integrating circuit for AC-CDC drive power supply provided by this utility model only needs to be in the pF level, which can provide a slow pole for the control loop and achieve a high power factor.
[0059] Furthermore, according to the following formula (3), we can know that:
[0060]
[0061] The speed of the entire system loop can be changed by adjusting the ratio of the first capacitor C1 and the second capacitor C2, as well as the frequencies of the non-overlapping timing signals P1 and P2.
[0062] It should be noted that those skilled in the art should understand that the present invention does not impose excessive limitations on the types of the first capacitor C1 and the second capacitor C2. For example, the first capacitor C1 and the second capacitor C2 can be, but are not limited to, electrolytic capacitors, organic dielectric capacitors, or inorganic dielectric capacitors.
[0063] For example, in some exemplary embodiments, please refer to Figure 5c , it is Figure 5a The circuit structure diagram of the switching element used in the first switching unit and / or the second switching unit is shown in Figure 5. The first switching unit S1 and / or the second switching unit S2 includes a switching element, which is illustrated as a transmission gate in Figure 5. Therefore, by employing the switching element (such as a transmission gate) to implement the first switching unit S1 and / or the second switching unit S2, the integrating circuit for AC / DC drive power supply provided by this invention can achieve the advantages of low power consumption and high reliability.
[0064] Example 2
[0065] As mentioned above, the integration circuit for the ACCDC drive power supply provided in this embodiment differs from the integration circuit for the ACCDC drive power supply provided in Embodiment 1 in that the integration circuit for the ACCDC drive power supply provided in this embodiment further includes a non-overlapping timing control circuit 122. To avoid redundancy, the following only describes the differences between it and Embodiment 1. For parts not mentioned in this embodiment, please refer to the description of Embodiment 1 for an adaptive understanding.
[0066] For example, please see Figure 6 The diagram schematically illustrates the structural block diagram of the integrating circuit for an ACDC drive power supply provided in this embodiment. From... Figure 6As can be seen, the integrating circuit for the ACDC drive power supply provided in this embodiment also includes a non-overlapping timing control circuit 122. The input terminal of the non-overlapping timing control circuit 122 is used to receive the control signal (such as a clock signal), and the output terminal of the non-overlapping timing control circuit 122 is used to output the non-overlapping timing signal. Therefore, the integration level of this invention can be further improved, thereby further reducing costs.
[0067] For example, please see Figure 7a and Figure 7b ,in, Figure 7a for Figure 6 A schematic diagram of the circuit topology of the Sino-African overlapping timing control circuit 122; Figure 7b for Figure 7a Timing diagram of the non-overlapping timing signals output by the non-overlapping timing control circuit 122. Specifically, in this example, a two-phase non-overlapping timing control circuit 122 is used as an example. Figure 7a As shown, in this example, the two-phase non-overlapping timing control circuit 122 includes a NAND gate, an inverter, a delay inverter, and a buffer. The delay time ΔT between the non-overlapping timing signals P1 and P2 can be adjusted by changing the number of delay inverters located on branches A and B; the relative delay time Δt between timing signals P1 and P1D or between P2 and P2D is related to the delay inverters on the other two branches, and the delay time can be adjusted by changing the number of delay inverters. For more detailed information on the two-phase non-overlapping timing control circuit 122, please refer to the relevant content on overlapping timing control circuits known to those skilled in the art; due to space limitations, detailed descriptions are not presented here.
[0068] Preferably, in some exemplary embodiments, the non-overlapping timing control circuit 122 is further configured to control the frequency of the output non-overlapping timing signal during the establishment of the ACCDC drive power supply steady state to be greater than the frequency after the ACCDC drive power supply has established a steady state. Thus, by having the non-overlapping timing signal output by the non-overlapping timing control circuit 122 at a slightly higher frequency during the establishment of the ACCDC drive power supply steady state (e.g., close to 90% of the target), it is easier to enter a steady state more quickly, thereby improving the system's response speed; by having the non-overlapping timing signal output at a slightly lower frequency after the ACCDC drive power supply has established a steady state, stability in the steady state can be improved.
[0069] Example 3
[0070] As mentioned above, the integration circuit for the ACCDC drive power supply provided in this embodiment differs from the integration circuit for the ACCDC drive power supply provided in Embodiment 1 in that the integration circuit for the ACCDC drive power supply provided in this embodiment also includes a zero-adjustment sub-circuit. To avoid redundancy, the following only describes the differences between it and Embodiment 1. For parts not mentioned in this embodiment, please refer to the description of Embodiment 1 for an adaptive understanding.
[0071] For example, please see Figure 8 , Figure 8 This is a block diagram of the integrating circuit for an ACDC drive power supply provided in this embodiment. From... Figure 8 As can be seen, the integrating circuit for the AC / CDC drive power supply provided in this embodiment also includes a zero-adjustment sub-circuit 123. The first terminal of the zero-adjustment sub-circuit 123 is coupled to the common contact point, and the second terminal of the zero-adjustment sub-circuit 123 is coupled to a reference ground. The control terminal of the zero-adjustment sub-circuit 123 receives a zero-adjustment control signal. The zero-adjustment sub-circuit 123 is used to adjust the zero-point distribution of the AC / CDC drive power supply according to the received zero-adjustment control signal. Therefore, by using the integrating circuit for the AC / CDC drive power supply provided by this utility model, not only can the required zero-point and pole distribution of the system containing the AC / CDC drive power supply be achieved, but the integrating circuit can also be highly integrated, and the loop regulation of the system can be achieved by utilizing the frequency of non-overlapping timing signals, the frequency change of the zero-adjustment control signal, or the change of capacitance ratio.
[0072] Preferably, in some exemplary embodiments, please refer to Figure 9 , Figure 9 This is a schematic diagram of the circuit topology of one specific example of the integrating circuit for an ACDC drive power supply provided in this embodiment. From Figure 9 As can be seen, the zero-adjustment sub-circuit 123 includes a third switching unit S3, a fourth switching unit S4, a third capacitor C3, and a fourth capacitor C4; the first terminal of the third switching unit S3 is coupled to the common contact point, the second terminal of the third switching unit S3, the first terminal of the third capacitor C3, and the first terminal of the fourth switching unit S4 are coupled together, the second terminal of the fourth switching unit S4 is coupled to the first terminal of the fourth capacitor C4, and the control terminals of the third switching unit S3 and the fourth switching unit S4 are used to receive the zero-adjustment control signal; the second terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4 are coupled to reference ground.
[0073] The integrating circuit for AC / DC drive power supply provided by this utility model includes a zero-adjustment sub-circuit 123 comprising a third switching unit S3, a fourth switching unit S4, a third capacitor C3, and a fourth capacitor C4. This configuration not only facilitates the integration of the AC / DC drive power supply into a drive power supply chip, significantly reducing the occupied area and requiring fewer components, thus significantly reducing costs, but also allows for flexible adjustment of the frequency of the zero-adjustment control signals P3 and P4 to control the on and off states of the third switching unit S3 and the fourth switching unit S4 to cope with loop changes in the system containing the AC / DC drive power supply, thereby effectively achieving high power factor (PF) and low loop bandwidth.
[0074] Example 4
[0075] This embodiment provides an AC-CDC driving power supply, which includes the integrating circuit for an AC-CDC driving power supply described in any of the above embodiments. Since the AC-CDC driving power supply provided by this utility model and the integrating circuit for an AC-CDC driving power supply provided by this utility model belong to the same inventive concept, the AC-CDC driving power supply provided by this utility model possesses at least all the advantages of the integrating circuit for an AC-CDC driving power supply provided by this utility model. To avoid redundancy, further explanation is not provided here; for more detailed information, please refer to the relevant description of the beneficial effects of the integrating circuit for an AC-CDC driving power supply provided by this utility model.
[0076] It should be noted that, as those skilled in the art will understand, in addition to the integrating circuit, the AC-CDC drive power supply provided by this utility model may also include an input circuit that receives external power input and performs preliminary processing such as filtering high-frequency interference and surge protection, a rectification and filtering circuit, a power conversion circuit, and a protection circuit. For more detailed information on AC-CDC drive power supplies, please refer to relevant technologies on AC-CDC drive power supplies known to those skilled in the art; due to space limitations, these will not be elaborated upon here.
[0077] It should be understood that the application fields of the AC-CDC driver power supply provided by this utility model are not limited in any way. For example, the AC-CDC driver power supply provided by this utility model can be used in fields including but not limited to lighting (such as LED lighting), security and Internet of Things (such as fire alarm systems and smart home access control systems), and medical fields (such as medical imaging equipment and portable medical devices).
[0078] Example 5
[0079] This embodiment provides a chip that integrates the integrating circuit for an AC-CDC drive power supply as described in any of the above embodiments, or integrates the AC-CDC drive power supply as described in the above embodiments. It should be noted that this utility model does not limit the chip's manufacturing process, application field, or function.
[0080] Example 6
[0081] This embodiment provides an electronic device, which includes the integrating circuit, the AC / DC driving power supply, or the chip described in any of the above embodiments. Those skilled in the art should understand that this invention does not limit the scope of the electronic device. Exemplarily, the electronic device includes, but is not limited to, video products such as televisions, video recorders, and digital cameras; communication products such as mobile phones, communication switching equipment, and communication transmission equipment; learning aids such as translators, learning machines, and electronic dictionaries; and medical devices such as medical imaging equipment and medical testing equipment, etc., without exhaustive list.
[0082] In summary, compared with the prior art, the integrating circuit, AC / DC drive power supply, chip, and electronic equipment provided by this utility model have the following advantages:
[0083] The present invention provides an integrating circuit for an AC-CDC drive power supply, comprising a variable impedance sub-circuit and a first capacitor. On one hand, the variable impedance sub-circuit can charge and discharge the first capacitor based on the error between the current detection signal calculated by the transconductance amplifier and the reference voltage signal, forming an integrating stage, thereby achieving high pF and low loop bandwidth. On the other hand, the variable impedance sub-circuit can also adjust the pole positions of the control loop according to the received control signal, thereby adjusting the bandwidth of the control loop of the AC-CDC drive power supply. Furthermore, the capacitance of the first capacitor is only in the pF range, which can be directly integrated onto the AC-CDC drive power supply chip, eliminating the need for additional surface-mount capacitors and corresponding peripheral circuits, thus reducing the area of the AC-CDC drive power supply; it also eliminates the need for an AD converter, digital integrator, and DA converter, effectively reducing costs. In summary, the present invention not only achieves high pF and low loop bandwidth effectively, but also has the advantages of simple structure, few components, and low cost.
[0084] In addition, the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
[0085] The above description is merely a description of the preferred embodiments of the integrating circuit, AC / DC drive power supply, chip, and electronic equipment provided by this utility model, and is not intended to limit the scope of this utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.
Claims
1. An integrating circuit for an ACCDC drive power supply, the ACCDC drive power supply including a transconductance amplifier, wherein the non-inverting input terminal of the transconductance amplifier receives a reference voltage signal and the negative-inverting input terminal receives a current detection signal output by the ACCDC drive power supply; characterized in that, The integrator circuit includes a variable impedance sub-circuit and a first capacitor; The first terminal of the variable impedance sub-circuit is coupled to the output terminal of the transconductance amplifier. The common connection point of the second terminal of the variable impedance sub-circuit and the first terminal of the first capacitor is used to output an integral signal. The integral signal participates in the control loop of the ACDC drive power supply. The second terminal of the first capacitor is connected to the reference ground. The variable impedance sub-circuit is used to adjust the bandwidth of the control loop according to the frequency of the received control signal.
2. The integrating circuit according to claim 1, characterized in that, The control signal includes two non-overlapping timing signals; the variable impedance sub-circuit includes a first switching unit, a second switching unit, and a second capacitor; the first terminal of the first switching unit is coupled to the output terminal of the transconductance amplifier, the second terminal of the first switching unit, the first terminal of the second capacitor, and the first terminal of the second switching unit are coupled together, the second terminal of the second capacitor is connected to a reference ground, and the second terminal of the second switching unit is coupled to the common contact point; the control terminals of the first switching unit and the second switching unit respectively receive the timing signals. The first switching unit and the second switching unit are used to alternately turn on and off according to the received timing signal.
3. The integrating circuit according to claim 2, characterized in that, The first switching unit and / or the second switching unit include a switching element.
4. The integrating circuit according to claim 2, characterized in that, The integrator circuit further includes a non-overlapping timing control circuit, the input of which is used to receive the control signal, and the output of which is used to output the non-overlapping timing signal.
5. The integrating circuit according to claim 4, characterized in that, The non-overlapping timing control circuit is also used to control the frequency of the output non-overlapping timing signal during the steady-state establishment of the ACDC drive power supply to be greater than the frequency after the ACDC drive power supply has established a steady state.
6. The integrating circuit according to claim 1, characterized in that, The integrating circuit also includes a zero-adjustment sub-circuit, the first terminal of which is coupled to the common contact point, the second terminal of which is coupled to the reference ground, and the control terminal of which receives a zero-adjustment control signal. The zero-adjustment sub-circuit is used to adjust the zero-point distribution of the ACCDC drive power supply according to the received zero-adjustment control signal.
7. The integrating circuit according to claim 6, characterized in that, The zero-adjustment sub-circuit includes a third switching unit, a fourth switching unit, a third capacitor, and a fourth capacitor; the first terminal of the third switching unit is coupled to the common contact point, the second terminal of the third switching unit, the first terminal of the third capacitor, and the first terminal of the fourth switching unit are coupled together, the second terminal of the fourth switching unit is coupled to the first terminal of the fourth capacitor, and the control terminals of the third and fourth switching units are used to receive the zero-adjustment control signal; the second terminals of the third and fourth capacitors are coupled to a reference ground.
8. An AC-DC drive power supply, characterized in that, Including the integrating circuit as described in any one of claims 1 to 7.
9. A chip, characterized in that, The chip integrates an integrating circuit for an AC / DC drive power supply as described in any one of claims 1 to 7, or the chip integrates an AC / DC drive power supply as described in claim 8.
10. An electronic device, characterized in that, The electronic device includes an integrating circuit as described in any one of claims 1 to 7, an AC / DC drive power supply as described in claim 8, or a chip as described in claim 9.