Driving circuit and electronic device

Abstract

The invention relates to a driving circuit and electronic equipment, and the driving circuit carries out the voltage conversion through a transformer circuit module according to a power supply signal, outputs a target DC signal to a first boost circuit module, and employs the first boost circuit module to carry out the voltage conversion according to a pulse input signal and a feedback detection signal fed back by a second boost circuit module. A target direct current signal is subjected to primary boosting, a direct current boosting signal is output, then secondary boosting is carried out through the second boosting circuit module according to the direct current boosting signal, and a two-stage boosting structure composed of the first boosting circuit module and the second boosting circuit module is used for boosting the target direct current signal. The voltage stress of a power device required from the output end of the transformer to the load driving end is reduced, so that a pre-stage device of the load driving end can adopt a component with a lower electric power specification; therefore, the technical problems of high system cost, large size and difficulty in meeting the light and thin requirements caused by the fact that a power device needs to bear higher voltage stress in the prior art of the power supply are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply driving, and in particular to a driving circuit and an electronic device. BACKGROUND

[0002] With the rapid development of the consumer electronics industry, the demand for power management systems of electronic devices is increasingly stringent, and power management systems are developing towards low cost, high efficiency, thinness and intelligence.

[0003] In most power supply circuits, the rectification and filtering power device after the transformer output and the power device and integrated circuit (IC) chip driven by the subsequent boost (BOOST) are key factors affecting the cost and volume of the system. In the traditional scheme, in order to meet the high-voltage driving demand of the load, a relatively high voltage is usually output after the transformer rectification, which causes the rectification and filtering power device after the transformer output, the power device of the BOOST circuit and the IC chip to bear a high voltage stress; in order to adapt to the high voltage stress, the above-mentioned power device and IC chip need to adopt a high-voltage specification, which not only directly increases the device procurement cost, but also the high-voltage device usually has a larger package size, resulting in a larger overall size of the switching power supply, which is difficult to meet the design demand of thinness of electronic devices. SUMMARY

[0004] Therefore, the present application provides a driving circuit and an electronic device to solve the problem of high system cost, large volume and difficulty in meeting the thinness demand caused by the high voltage stress borne by the power device in the prior art.

[0005] In a first aspect, the present application provides a driving circuit, comprising: a transformer circuit module, a first boost circuit module and a second boost circuit module; The transformer circuit module is configured to perform voltage conversion according to a power supply signal and output a target direct current signal. The first boost circuit module is configured to perform primary voltage boosting on the target direct current signal according to a pulse input signal in combination with a feedback detection signal fed back by the second boost circuit module, and output a direct current boost signal. The second boost circuit module is configured to perform secondary voltage boosting on the direct current boost signal and output a constant current driving signal and the feedback detection signal.

[0006] Optionally, the first boost circuit module comprises: a boost inductor, a first diode, a second output capacitor, a first switch tube and a driving control submodule. The first end of the boost inductor serves as the DC input terminal of the first boost circuit module and is electrically connected to any one output terminal of the transformer circuit module. Any one output terminal of the transformer circuit module is used to output the target DC signal. The second terminal of the boost inductor serves as the first connection terminal of the first boost circuit module, and is electrically connected to the first terminal of the second boost circuit module, the second terminal of the first switching transistor, and the anode of the first diode. The cathode of the first diode, the first terminal of the second output capacitor, and the input terminal of the second boost circuit module are electrically connected; The first terminal of the first switching transistor is electrically connected to the first terminal of the drive control submodule, and the third terminal of the first switching transistor and the second terminal of the second output capacitor are electrically connected to the reference ground of the first boost circuit module. The drive control submodule is used to: output a drive pulse signal to the first switching transistor based on the pulse input signal and the feedback detection signal fed back by the second boost circuit module, so as to control the state of the first switching transistor through the drive pulse signal, so that the first boost circuit module outputs the DC boost signal based on the voltage of the second output capacitor.

[0007] Optionally, the drive control submodule includes: a controller unit, a first resistor, a second resistor, a third resistor, and a fourth resistor; The drive control terminal of the controller unit serves as the first terminal of the drive control submodule and is electrically connected to the first terminal of the first switching transistor through the first resistor. The first end of the second resistor is electrically connected to the anode of the first diode. The second end of the second resistor, the first end of the third resistor, and the detection terminal of the controller unit are electrically connected. The second end of the third resistor, the third end of the first switching transistor, and the first end of the fourth resistor are electrically connected. The second end of the fourth resistor is electrically connected to the reference ground of the drive circuit. The controller unit is specifically used to: determine a reference voltage based on the pulse input signal, and determine a working mode based on the reference voltage and the detection voltage corresponding to the detection terminal of the controller unit, so as to output the drive pulse signal according to the working mode.

[0008] Optionally, the second boost circuit module includes: an energy storage capacitor, a first output capacitor, a second diode, a third diode, and a load resistor; Wherein, the first end of the energy storage capacitor is electrically connected to the first connection end of the first boost circuit module, and the second end of the energy storage capacitor, the cathode of the second diode, and the anode of the third diode are electrically connected; The anode of the second diode serves as the input terminal of the second boost circuit module and is electrically connected to the output terminal of the first boost circuit module. The output terminal of the first boost circuit module is used to output the DC boost signal. The cathode of the third diode, the first end of the load resistor, and the first end of the first output capacitor are electrically connected to the output end of the second boost circuit module. The output end of the second boost circuit module is used to output the constant current drive signal. The second end of the load resistor is electrically connected to the feedback input terminal of the first boost circuit module, and the second end of the load resistor is used to output the feedback detection signal; The second terminal of the first output capacitor is electrically connected to the reference ground of the driving circuit.

[0009] Optionally, the transformer circuit module includes: a transformer and a rectifier-filter submodule. The secondary output terminal of the transformer is electrically connected to the input terminal of the rectifier and filter submodule, and the output terminal of the rectifier and filter submodule is electrically connected to the DC input terminal of the first boost circuit module. The transformer is used to step down the voltage based on the power supply signal and output the transformer secondary output signal. The rectifier and filter submodule is used to perform rectification and filtering based on the secondary output signal of the transformer to output at least one DC signal, wherein the at least one DC signal includes the target DC signal.

[0010] Optionally, the rectifier and filter submodule includes: rectifier and filter branches that are connected one-to-one with the secondary output terminals of the transformer; The secondary output terminal of the transformer is used to output the secondary output signal of the transformer; Each of the rectifier-filter branches is used to rectify and filter the output signal of the transformer secondary to output a DC signal.

[0011] Optionally, the rectifier branch includes: a rectifier diode and a filter capacitor; the anode of the rectifier diode serves as the input terminal of the rectifier-filter branch and is electrically connected to the secondary output terminal of the transformer; the cathode of the rectifier diode is electrically connected to the first terminal of the filter capacitor, serving as the output terminal of the rectifier-filter branch; the second terminal of the filter capacitor is electrically connected to the reference ground of the transformer output drive circuit.

[0012] Optionally, the above-mentioned driving circuit further includes: a rectifier bridge and an energy storage filter circuit; the input terminal of the rectifier bridge and the energy storage filter circuit is used to connect to AC power, and the output terminal of the rectifier bridge and the energy storage filter circuit is electrically connected to the input terminal of the driving circuit; the rectifier bridge and the energy storage filter circuit is used to: input a power supply signal to the driving circuit based on the AC power.

[0013] Optionally, the power supply signal can be an AC power supply signal or a DC power supply signal.

[0014] In a second aspect, this application provides an electronic device comprising a driving circuit as described in any of the first aspects.

[0015] In summary, the driving circuit and electronic device provided in this application include: a transformer circuit module, a first boost circuit module, and a second boost circuit module. The transformer circuit module performs voltage conversion based on the power supply signal and outputs a target DC signal to the first boost circuit module. The first boost circuit module performs primary voltage boosting on the target DC signal and then outputs a boosted DC signal to the second boost circuit module. This allows the second boost circuit module to perform secondary voltage boosting based on the boosted DC signal, outputting a constant current drive signal and a corresponding feedback detection signal. The feedback detection signal can be fed back to the first boost circuit module, thereby enabling... The first boost circuit module can perform primary boosting based on the pulse input signal and the feedback detection signal from the second boost circuit module, thereby achieving a closed-loop control effect between the first and second boost circuit modules. Through the two-stage boost structure composed of the first and second boost circuit modules, the voltage stress on the power devices required from the transformer output to the load drive end is reduced. This allows the front-end devices at the load drive end to use components with lower power specifications, thus reducing the specifications and cost of the front-end devices. This solves the technical problems of high system cost, large size, and difficulty in meeting the requirements for thinness and lightness caused by the high voltage stress required by the power devices in the prior art. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a driving circuit provided in an embodiment of this application; Figure 2 A circuit diagram of a transformer circuit module provided as an optional embodiment of this application; Figure 3 A schematic diagram of the circuit structure of a driving circuit provided for an optional embodiment of this application; Figure 4 A circuit schematic diagram of a first boost circuit module provided for an optional embodiment of this application; Figure 5 A circuit schematic diagram of a second boost circuit module provided for an optional embodiment of this application; Figure 6 This is a schematic diagram of a driving circuit provided as an optional example in this application; Figure 7 A structural block diagram of a compressor output drive system provided in an embodiment of this application; Figure 8 A schematic diagram of a driving circuit based on AC power output of a constant current driving signal is provided as an example of this application. Figure 9 This is a structural block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0021] As a core component of electrical systems, switching power supplies play a crucial role in providing stable power to various electronic devices. However, in existing traditional switching power supply solutions, the transformer secondary output signal, after rectification and filtering, is only boosted once by the BOOST circuit. This makes it difficult for existing switching power supplies to meet the design requirements of thinner and lighter electronic devices. For example, to output 100V to drive a load, using only the BOOST circuit for boosting requires a transformer to provide approximately 50V DC signal to the BOOST circuit. This results in the rectifier and filter power devices after the transformer output, as well as the power devices and IC chips in the subsequent boost drive circuit, all having to withstand high voltage stress. Furthermore, to meet high voltage requirements, complex solutions such as multiple independent drives are sometimes required, further increasing system cost and complexity, leading to higher costs and larger sizes, making it difficult to meet the requirements for thinner and lighter designs.

[0022] Based on the above, this application provides a driving circuit and electronic device that can significantly reduce the voltage stress of the power devices and ICs required from the transformer output terminal to the load driving terminal, thereby reducing the voltage specifications of the power devices and ICs required from the transformer output terminal to the load driving terminal. This solves the technical problems of high system cost, large size, and difficulty in meeting the requirements for thinness and lightness caused by the high voltage stress required by the power devices in the prior art.

[0023] Figure 1 This is a schematic diagram of a driving circuit provided in an embodiment of this application. Figure 1 As shown, the driving circuit provided in this embodiment may specifically include: a transformer circuit module 110, a first boost circuit module 120, and a second boost circuit module 130. The transformer circuit module 110 is used to perform voltage conversion based on the power supply signal and output a target DC signal. The first boost circuit module 120 is used to perform primary boosting of the target DC signal based on the pulse input signal Pwm and the feedback detection signal Fb1 fed back from the second boost circuit module 130, outputting a DC boost signal Vout1. The second boost circuit module 130 is used to perform secondary boosting based on the DC boost signal Vout1, outputting a constant current drive signal Vout2 and the feedback detection signal Fb1.

[0024] In this embodiment, the power supply signal refers to the power supply signal that supplies power to the transformer circuit module 110. Specifically, it can be an AC power supply signal or a DC power supply signal, and this embodiment does not limit this. Among them, the AC power supply signal refers to the AC power signal that supplies power to the transformer circuit module 110, such as AC power provided by the power grid; the DC power supply signal refers to the DC power that supplies power to the transformer circuit module 110.

[0025] The target DC signal can refer to the DC signal output by the transformer circuit module 110 to the first boost circuit module 120. In a specific implementation, the transformer output module can perform voltage conversion based on the power supply signal to output one or more DC signals. Any one of its output DC signals can be transmitted as the target DC signal to the first boost circuit module 120. The first boost circuit module 120 performs primary boosting on the target DC signal based on the pulse input signal Pwm to generate a DC boost signal Vout1. Subsequently, the DC boost signal Vout1 can be further boosted by the second boost circuit module. By utilizing the first boost circuit module 120 and the second boost circuit module 130, a secondary boost is achieved, thereby reducing the voltage stress on the power devices and ICs required from the transformer output terminal to the load drive terminal. This allows the front-end devices at the load drive terminal to use components with lower power specifications. The pulse input signal Pwm can refer to an external pulse signal input to the drive circuit. For example, the pulse input signal Pwm can be a pulse width modulation (PWM) wave signal with a fixed frequency and changing duty cycle output by the motherboard. This application embodiment does not limit this.

[0026] Specifically, in this embodiment, the output terminal of the transformer circuit module 110 is electrically connected to the DC input terminal of the first boost circuit module 120, so that the target DC signal output by the transformer circuit module 110 can be input to the first boost circuit module 120. The first boost circuit module 120 then performs primary boosting on the target DC signal to generate a DC boost signal Vout1. Subsequently, the DC boost signal Vout1 can be transmitted to the second boost circuit module 130 through the output terminal of the first boost circuit module 120, allowing the second boost circuit module to perform secondary boosting based on the DC boost signal Vout1, outputting a constant current drive signal Vout2 and a corresponding constant current drive signal Vout2. The feedback detection signal Fb1 can be fed back to the first boost circuit module 120, so that the first boost circuit module 120 can perform primary boosting based on the pulse input signal Phm and the feedback detection signal Fb1 fed back by the second boost circuit module 130, thereby achieving closed-loop control of the first boost circuit module 120 and the second boost circuit module 130. The two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130 can achieve secondary boosting, thereby reducing the voltage stress on the power devices and ICs required from the transformer output terminal to the load drive terminal, so that the front-end devices at the load drive terminal can use components with lower power specifications.

[0027] In summary, in this embodiment, after the transformer circuit module 110 performs voltage conversion based on the power supply signal, it outputs a target DC signal to the first boost circuit module 120. The first boost circuit module 120 performs primary voltage boosting on the target DC signal. Subsequently, the second boost circuit module 130 performs secondary voltage boosting on the DC boost signal Vout1 output by the first boost circuit module 120, thereby outputting a constant current drive signal Vout2 as the drive signal required by the load. This provides the load with the constant current drive required by the load, and the feedback detection signal Fb1 corresponding to the constant current drive signal Vout2 can be fed back to the first boost circuit module 120. This allows the first boost circuit module 120 to perform primary boosting based on the pulse input signal Phm and the feedback detection signal Fb1 fed back from the second boost circuit module 130, achieving a closed-loop control effect between the first boost circuit module 120 and the second boost circuit module 130. Furthermore, the two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130 enables secondary boosting, allowing the front-end devices at the load drive end to use components with lower power specifications. This reduces the specifications and cost of the front-end devices, solving the technical problems of high system cost, large size, and difficulty in meeting the requirements for thinness and lightness caused by the high voltage stress required by power devices in the prior art.

[0028] Optionally, the transformer circuit module 110 in this embodiment may include a transformer T0D1 and a rectifier and filter submodule 111, such as... Figure 2 As shown, the secondary output terminal of transformer T0D1 is electrically connected to the input terminal of the rectifier and filter submodule 111, and the output terminal of the rectifier and filter submodule 111 is electrically connected to the DC input terminal of the first boost circuit module 120. The secondary output terminal of transformer T0D1 can be used to output the secondary output signal of the transformer, so that the rectifier and filter submodule 111 can perform rectification and filtering based on the secondary output signal of the transformer and output the target DC signal to the DC input terminal of the first boost circuit module 120.

[0029] Specifically, the transformer T0D1 in the transformer circuit module 110 can be used to step down the voltage based on the power supply signal, outputting a transformer secondary output signal. This secondary output signal can be transmitted to the rectifier and filter submodule 111 via the secondary output terminal of transformer T0D1. The rectifier and filter submodule 111 can then perform rectification and filtering based on the transformer secondary output signal, outputting one or more DC signals. Furthermore, the DC signal output from any output terminal of the rectifier and filter submodule 111 can be used as a target DC signal and output to the first boost circuit module 120. The first boost circuit module 120 then performs primary voltage boosting on the target DC signal based on the pulse input signal Pwm. Therefore, the rectifier and filter submodule 111 in this embodiment is configured to: perform rectification and filtering based on the transformer secondary output signal, outputting a DC signal. The output terminal of the rectifier and filter submodule 111 can serve as the output terminal of the transformer circuit module 110, specifically for outputting a DC signal.

[0030] Optionally, in order to output DC signals with different voltage values, the transformer circuit module 110 in this embodiment can be provided with two or more output terminals to output DC signals with different voltage values ​​through each output terminal. The DC signal output from any output terminal of the transformer circuit module can be used as the target DC signal and output to the first boost circuit module 120 so that the first boost circuit module 120 can perform primary boosting of the target DC signal according to the pulse input signal Pwm.

[0031] In an optional embodiment of this application, the rectifier and filter submodule 111 can be configured with rectifier and filter branches 1110 according to the number of secondary output terminals of transformer T0D1. This allows the rectifier and filter submodule 111 to include rectifier and filter branches 1110 connected one-to-one with the secondary output terminals of transformer T0D1, meaning the number of rectifier and filter branches 1110 is equal to the number of secondary output terminals of transformer T0D1. The rectifier and filter branches 1110 can be used to rectify and filter the transformer secondary output signal output from the transformer T0D1 output terminal to output DC signals of various voltage values. The input terminals of the rectifier and filter branches 1110 are connected one-to-one with the secondary output terminals of transformer T0D1; each rectifier and filter branch 1110 is used to rectify and filter the transformer secondary output signal to output a DC signal. In a specific implementation, the output terminal of the rectifier and filter branch 1110 serves as the output terminal of the rectifier and filter submodule 111, specifically used to output a DC signal.

[0032] In an optional embodiment of this application, the rectifier-filter branch 1110, which is connected one-to-one with the secondary output terminal of transformer TOD1, may include a rectifier diode and a filter capacitor. The anode of the rectifier diode is connected one-to-one with the secondary output terminal of transformer TOD1, and the cathode of the rectifier diode is electrically connected to the first terminal of the filter capacitor to perform rectification using the rectifier diode. The second terminal of the filter capacitor may be grounded, such as being electrically connected to the reference ground of the transformer output drive circuit, to perform filtering and voltage regulation using the filter capacitor, thereby achieving the purpose of outputting a stable DC signal.

[0033] Optionally, when the transformer circuit module 110 has at least two output terminals, any one of the output terminals of the transformer circuit module 110 can be used as the target output terminal connected to the first boost circuit module 120. The first boost circuit module 120 is used to perform primary boosting on the target DC signal output from the target output terminal, and the second boost circuit module 130 is used to perform secondary boosting on the DC boost signal Vout1 output from the first boost circuit module 120. This two-stage boosting structure enables secondary boosting of the transformer secondary output terminal.

[0034] In an optional embodiment of this application, such as Figure 3 As shown, the first boost circuit module 120 may include a drive control submodule 121, a first switching transistor Q1, a boost inductor L1, a first diode D1, and a second output capacitor C2. The first terminal of the boost inductor L1 can serve as the DC input terminal of the first boost circuit module 120, electrically connected to any output terminal of the transformer circuit module 110. This allows the first boost circuit module 120 to receive the target DC signal output by the transformer circuit module 110, and subsequently boost the target DC signal output by the transformer circuit module 110. Any output terminal of the transformer circuit module 110 is used to output the target DC signal. Electrical signal; the second end of the boost inductor L1 serves as the first connection terminal N1 of the first boost circuit module 120, and is electrically connected to the first terminal of the second boost circuit module 130, the second terminal of the first switching transistor Q1, and the anode of the first diode D1. The cathode of the first diode D1, the first terminal of the second output capacitor C2, and the input terminal of the second boost circuit module 130 are electrically connected, so that the DC boost signal output by the first boost circuit module 120 can be transmitted to the second boost circuit module 130 through the input terminal of the second boost circuit module 130, thereby enabling the second boost circuit module 130 to perform secondary boost based on the DC boost signal Vout1.

[0035] Wherein, the first terminal of the first switch Q1 serves as the control drive terminal of the first switch Q1 and is electrically connected to the first terminal of the drive control submodule 121; the third terminal of the first switch Q1 and the second terminal of the second output capacitor C2 are respectively electrically connected to the reference ground of the drive circuit; the drive control submodule 121 is used to: receive a pulse input signal Pwm, and output a drive pulse signal to the first switch Q1 based on the received pulse input signal Pwm and the feedback detection signal Fb1 fed back by the second boost circuit module 130, so as to control the state of the first switch Q1 through the drive pulse signal, so that the first boost circuit module 120 outputs the DC boost signal Vout1 based on the voltage of the second output capacitor C2.

[0036] Optionally, the drive control submodule 121 in this embodiment can serve as the drive control circuit in the first boost circuit module 120. It may include a controller unit to output a drive pulse signal based on the received pulse input signal Pwm and the feedback detection signal Fb1 from the second boost circuit module 130. This allows the controller unit to control the state of the first switching transistor Q1, thus achieving primary boost control. The controller unit can be a microcontroller unit (MCU) or other types of control processors; this embodiment does not impose any limitations on this.

[0037] In an optional embodiment of this application, in order to achieve detection, open-loop protection, and closed-loop compensation functions, such as Figure 4 As shown, the drive control submodule 121 may include: a controller unit M1, a first resistor R101, a second resistor R102, a third resistor R103, and a fourth resistor R104; wherein, the drive control terminal DRAIN of the controller unit M1 can serve as the first terminal of the drive control submodule 121, and is electrically connected to the first terminal of the first switch Q1 through the first resistor R101. Specifically, the first terminal of the first resistor R101 is electrically connected to the drive control terminal DRAIN of the controller unit M1, and the second terminal of the first resistor R101 is electrically connected to the first terminal of the first switch Q1, so that the drive control terminal DRAIN of the controller unit M1 can be electrically connected to the first terminal of the first switch Q1 through the first resistor R101.

[0038] Furthermore, in this embodiment, the first end of the second resistor R102 is electrically connected to the anode of the first diode D1, the second end of the second resistor R102, the first end of the third resistor R103, and the detection terminal of the controller unit M1 are electrically connected, the second end of the third resistor R103, the third end of the first switch Q1, and the first end of the fourth resistor R104 are electrically connected, and the second end of the fourth resistor R104 is electrically connected to the reference ground of the drive circuit. This allows the controller unit M1 to perform voltage and current detection through the second resistor R102, the third resistor R103, and the fourth resistor R104, and to determine the operating mode based on the detected voltage and current. In this way, it can output a drive pulse signal to the first switch Q1 according to the operating mode.

[0039] As can be seen, the controller unit M1 in this embodiment can be specifically used to: determine a reference voltage based on the pulse input signal Pwm, and determine a working mode based on the reference voltage and the detection voltage corresponding to the detection terminal of the controller unit M1, so as to output the drive pulse signal according to the working mode. The detection voltage corresponding to the detection terminal of the controller unit M1 can refer to the voltage value detected by the detection terminal of the controller unit M1; the drive control terminal of the controller unit M1 serves as the first terminal of the drive control submodule 121, used to output the drive pulse signal, so as to control the state of the first switching transistor Q1 through the drive pulse signal, so that the first boost circuit module 120 can realize the charging and discharging control of the second output capacitor C2 based on the state of the first switching transistor Q1, and can output a DC boost signal Vout1 to the second boost circuit module 130 based on the voltage of the second output capacitor C2, so that the second boost circuit module 130 can perform secondary boosting according to the DC boost signal Vout1.

[0040] Of course, in addition to the controller unit M1, the first resistor R101, the second resistor R102, the third resistor R103 and the fourth resistor R104, the drive control submodule 121 may also include other circuit devices to realize other circuit functions, such as the fifth resistor R105, the sixth resistor R106, the seventh resistor R107, the first capacitor C101, the first capacitor C102, the third capacitor C103, etc. This application embodiment does not make specific limitations in this regard.

[0041] Optionally, embodiments of this application may be based on charge pump technology, using a charge pump boost circuit as the second boost circuit module 130 in this embodiment to achieve secondary boosting using charge pump boosting. Of course, besides using charge pump boosting to achieve secondary boosting, embodiments of this application may also use other boosting methods. That is, the second boost circuit module 130 in this embodiment may be implemented using other feasible boost circuits besides a charge pump boost circuit. For example, the second boost circuit module 130 may be implemented using a BOOST circuit, that is, using a second-stage BOOST circuit to achieve secondary boosting, based on a BOOST+BOOST combination, using a BOOST+BOOST circuit to achieve secondary boosting of the drive circuit. Embodiments of this application do not limit this.

[0042] In an optional embodiment of this application, the second boost circuit module 130 includes: an energy storage capacitor C1, a first output capacitor C3, a second diode D2, a third diode D3, and a load resistor RL; wherein, the first terminal of the energy storage capacitor C1 is electrically connected to the first connection terminal N1 of the first boost circuit module 120, such as... Figure 5 As shown, the second terminal of the energy storage capacitor C1, the cathode of the second diode D2, and the anode of the third diode D3 are electrically connected; the anode of the second diode D2 serves as the input terminal of the second boost circuit module 130 and is electrically connected to the output terminal of the first boost circuit module 120. The output terminal of the first boost circuit module 120 is used to output the DC boost signal Vout1, so that the second boost circuit module 130 can perform secondary boost based on the DC boost signal Vout1 output by the first boost circuit module 120; the cathode of the third diode D3, the first terminal of the load resistor RL, and the first terminal of the first output capacitor C3 are connected to the second boost circuit module 130. The output terminal of circuit module 130 is electrically connected to the output terminal of the second boost circuit module 130, which is used to output the constant current drive signal Vout2. The second terminal of the load resistor RL is electrically connected to the feedback input terminal of the first boost circuit module 120, allowing the second boost circuit module 130 to feed back the feedback detection signal Fb1 corresponding to the constant current drive signal Vout2 to the first boost circuit module 120. This enables the first boost circuit module 120 to perform primary boosting based on the pulse input signal Pwm and the feedback detection signal Fb1 fed back by the second boost circuit module 130, achieving closed-loop control of the first boost circuit module 120 and the second boost circuit module 130. The second terminal of the load resistor RL is used to output the feedback detection signal Fb1; the second terminal of the first output capacitor C3 is electrically connected to the reference ground of the drive circuit to achieve stable output of the constant drive signal.

[0043] The following description uses the example of a transformer circuit module 110 having two output terminals to illustrate the embodiments of this application. However, it should be noted that the embodiments of this application may have the features described below, but the following description does not constitute a limitation on the protection scope of the embodiments of this application.

[0044] As an optional example of this application, the transformer circuit module 110 can serve as the first circuit in the drive circuit. After the secondary output of the transformer, it outputs two DC signals after rectification and filtering to provide the DC power required by the load. For example, Figure 6 As shown, the transformer circuit module 110 may specifically include: a transformer T0D1, a first rectifier diode D01, a second rectifier diode D02, a first filter capacitor C01, and a second filter capacitor C02. The first rectifier diode D01 and the first filter capacitor C01 are used for rectification and filtering to output a DC signal, which serves as the first DC signal DC1 corresponding to the first output terminal of the transformer T0D1. The second rectifier diode D02 and the second filter capacitor C02 are used for rectification and filtering to output another DC signal, which serves as the second DC signal DC2 corresponding to the second output terminal of the transformer T0D1. The anode of the first rectifier diode D01 is electrically connected to the first output terminal of the transformer T0D1, and the cathode of the first rectifier diode D01 is electrically connected to the first terminal of the first filter capacitor C01. The second terminal of the first filter capacitor C01 is grounded. The first rectifier diode D01 and the first filter capacitor C01 form a rectifier and filter branch at the output terminal of the transformer T0D1, which serves as the first rectifier and filter branch in the filter and rectification module. Thus, the first rectifier and filter branch can be used to rectify and filter the first signal output from the first output terminal of the transformer T0D1 to output the first DC signal DC1. Similarly, the anode of the second rectifier diode D02 is electrically connected to the second output terminal of the transformer T0D1, and the cathode of the second rectifier diode D02 is electrically connected to the first terminal of the second filter capacitor C02, and the second terminal of the second filter capacitor C02 is grounded. The second rectifier diode D02 and the second filter capacitor C02 form another rectifier and filter branch at the output terminal of the transformer T0D1, which serves as the second rectifier and filter branch in the filter and rectification module. Thus, the second signal output from the second output terminal of the transformer T0D1 can be rectified and filtered using the second rectifier and filter branch to output the second DC signal DC2.

[0045] The first DC signal DC1 and the second DC signal DC2 can be two DC signals with equal voltage values ​​or two DC signals with unequal voltage values. This application does not impose specific restrictions on this.

[0046] Optionally, in the embodiments of this application, the DC signal output by the transformer circuit module 110 includes a first DC signal DC1 and a second DC signal DC2. For example, if the first output terminal of the transformer T0D1 is the tenth pin 10-24V of the flyback transformer used to output a 24-volt (Volt, V) voltage signal, and the second output terminal of the transformer T0D1 is the target output terminal connected to the ninth pin 9-12V and the eleventh pin 11-12V of the flyback transformer used to output a 12V voltage signal, after being rectified and filtered by the first rectifier filter branch composed of the first rectifier diode D01 and the first filter capacitor C01, a first DC signal DC1 with a voltage value of 24 volts can be output; and after being rectified and filtered by the second rectifier filter branch composed of the second rectifier diode D02 and the second filter capacitor C02, a second DC signal DC2 with a voltage value of 12 volts can be output. As can be seen, the transformer circuit module 110 in this embodiment can output DC signals with different voltage values ​​through different output terminals to meet the power supply requirements of different voltage values ​​and expand the application range of the drive circuit.

[0047] As an optional example of this application, if a flyback transformer is used as transformer T0D1 in transformer circuit module 110, the corresponding terminal of transformer T0D1 can be controlled according to the law of electromagnetic induction based on the flyback topology circuit adopted by the flyback transformer, so that the secondary output signal of transformer T0D1 is a half-wave signal. The corresponding terminal of transformer T0D1 is related to the flyback principle corresponding to the flyback topology circuit. When the corresponding terminal is set correctly, the direction of the transformer coil winding can be used to determine which side of the transformer has a high electromotive force. When the primary winding of the transformer stores energy, the secondary winding is reverse-cut off by the first rectifier diode D01 and the second rectifier diode D02, resulting in no output. When the primary winding is disconnected, the energy is transferred to the secondary winding, rectified by the first rectifier diode D01 and the second rectifier diode D02, and then filtered by the first filter capacitor C01 and the second filter capacitor C02, outputting a first DC signal DC1 and a second DC signal DC2.

[0048] For example, when the flyback switch SW of transformer T0D1 is connected in series in the coil winding between the fourth pin 4-SW and the sixth pin 6-Vin of transformer T0D1, the fourth pin 4-SW of transformer T0D1 can be used as the same-name terminal of transformer T0D1. By controlling the fourth pin 4-SW of transformer T0D1, the flyback switch SW can be controlled to open or close. For example, when the flyback switch SW is open, the primary coil of transformer T0D1 is charged; when SW is closed, energy is transferred to the secondary coil through the iron core, so that transformer T0D1 can output a half-wave signal through the secondary coil.

[0049] Optionally, in addition to the transformer TOD1, the first rectifier diode D01, the second rectifier diode D02, the first filter capacitor C01, and the second filter capacitor C02, the transformer circuit module 110 in this application embodiment may also include other circuit components, such as a control circuit chip. This application embodiment does not impose specific limitations on this.

[0050] The control circuit chip can be used to input a switch control signal to pin 4-SW of transformer T0D1, thereby controlling the flyback switch SW. For example, when the switch control signal is a high-level control signal, the flyback switch SW can be opened based on the high-level control signal, that is, the flyback switch SW is closed and turned on by the high-level control signal, so that the primary coil of the transformer is charged; when the switch control signal is a low-level control signal, the flyback switch SW is turned off based on the low-level control signal, and energy can be transferred to the secondary coil through the iron core of the transformer.

[0051] In specific implementation, by reasonably controlling the switching frequency of the flyback switch SW and the parameters of the first filter capacitor C01 and the second filter capacitor C02, the working mode of the transformer T0D1 can be effectively controlled. Since the voltage across the filter capacitor cannot change abruptly, after passing through the first rectifier diode D01 and the first filter capacitor C01, the transformer circuit module 110 can output a stable DC signal with small ripple as the first DC signal DC1. The first DC signal DC1 can be used as the target DC signal and transmitted to the first boost circuit module 120. The boost inductor L1 in the first boost circuit module 120 performs primary boosting on the target DC signal, outputting a DC boost signal Vout1 to the second boost circuit module for secondary boosting. Finally, the constant current drive signal Vout2 required by the load is output, so as to meet the constant current drive requirements of the load. Furthermore, after passing through the second rectifier diode D02 and the second filter capacitor C02, the transformer circuit module 110 can output another stable DC signal with small ripple as the second target DC signal DC2. The operating modes of transformer T0D1 may include, but are not limited to, discontinuous conduction mode (DCM), continuous conduction mode (CCM), and critical conduction mode (CRM), etc., and the embodiments of this application do not limit this.

[0052] Of course, in addition to the fourth pin 4-SW, the sixth pin 6-Vin, the tenth pin 10-24V, the ninth pin 9-12V and the eleventh pin 11-12V, the transformer T0D1 may also include other pins, such as the first pin 1-Gnd and the eighth pin 8-Gnd for grounding. This application does not impose specific limitations on this.

[0053] The first boost circuit module 120 can be used as the second circuit in the drive circuit. The DC input terminal of the first boost circuit module 120 can be used as the input terminal of the second circuit and connected to the output terminal of the first circuit. The fifth pin input terminal LED- of the controller unit M1 can be connected to the second terminal of the load resistor RL at the output terminal of the second boost circuit module 130, so that the second circuit is used for inductor BOOST primary boost.

[0054] The second boost circuit module 130 can be used as the third circuit in the drive circuit, and the negative terminal of the energy storage capacitor C1 in the second boost circuit module 130 can be used as an input terminal of the third circuit, connected to the output terminal of the boost inductor L1 in the second circuit (i.e., the second terminal of the boost inductor L1), the drain of the first switching transistor Q1 (i.e., the second terminal of the first switching transistor Q1), and the anode of the first diode D1. The anode of the second diode D2 serves as another input terminal of the third circuit, connected to the cathode of the first diode D1 in the second circuit and the positive terminal of the second output capacitor C2, so that the third circuit can perform secondary boosting for the entire circuit based on the charge pump boost, thereby realizing secondary boosting.

[0055] Among them, the energy storage capacitor C1 can be used for voltage superposition. When the first switch Q1 is turned on, the negative terminal of the energy storage capacitor C1 is grounded, and the negative terminal of the second output capacitor C2 is grounded. Since the energy storage capacitor C1 consumes energy when the switch is closed and opened, the second output capacitor C2 charges the energy storage capacitor C1. The voltage V2 across the energy storage capacitor C1 is the sum of the first DC signal voltage VDC1 and the induced electromotive force, that is, the voltage V2 across the energy storage capacitor C1 = VDC1 + induced electromotive force. Among them, the first DC signal voltage VDC1 is the voltage of the first DC signal DC1, which can specifically refer to the voltage across the first filter capacitor C01 after rectification by the first rectifier diode D01. If the duty cycle of the first switch Q1 is set at about 50%, then DC1 + induced electromotive force = 2DC1. When the switch is closed and open, the voltage across the negative terminal of the energy storage capacitor C1 is DC1 + induced electromotive force. Since the voltage across the energy storage capacitor C1 cannot change abruptly, when the switch is closed and open, the voltage V2 across the energy storage capacitor C1 is DC1 + induced electromotive force + DC1 + induced electromotive force, that is, V2 = DC1 + induced electromotive force + DC1 + induced electromotive force. This can provide the circuit with a voltage four times higher than the original voltage, enabling it to drive loads that require higher voltage.

[0056] The boost inductor L1 is used to store energy for primary voltage boosting, and the energy can be released by the continuous switching of the first switch Q1 to achieve primary voltage boosting. Specifically, the first boost circuit 20 can store energy through the boost inductor L1 for primary voltage boosting, and the first switch Q1 can be continuously switched by the controller unit M1 to release energy. In addition, the AC power output from the boost inductor is rectified into smooth DC power by the first diode D1 and the second output capacitor C2, and a DC boost signal is output to the second boost circuit module 130 to achieve primary voltage boosting.

[0057] The first switching transistor Q1, as a power switching device in the circuit, is controlled to turn on and off by the drive pulse signal output by the control unit M1, thereby realizing the energy storage and release of the boost inductor L1 and the transformer TOD1. In an optional embodiment of this application, the first switching transistor Q1 can be implemented as a metal-oxide-semiconductor field-effect transistor (MOS transistor), and this application embodiment does not limit this.

[0058] Optionally, based on the characteristics of the power MOSFET, the state of the first switching transistor Q1 can be divided into two operating states: a conducting state and a turning-off state. The conducting state refers to the operating state when the first switching transistor Q1 is turned on, and the turning-off state refers to the operating state when the first switching transistor Q1 is turned off.

[0059] When the first switch Q1 is in the ON state, the inductor current of the boost inductor L1 will not change abruptly. Due to the induced voltage source, as the inductor current increases, the induced voltage direction is consistent with the current direction. At this time, the boost inductor L1 enters charging. The anode of the first diode D1 is grounded through the ON first switch Q1, and the anode voltage of the first diode D1 is zero. The first diode D1 is clamped, and the second output capacitor C2 discharges to charge the energy storage capacitor C1. If the cathode voltage of the third diode D3 is greater than the anode voltage of the third diode D3, that is, if the voltage V3 across the first output capacitor C3 is greater than the voltage V2 across the energy storage capacitor C1, then the third diode D2... Diode D3 clamps the capacitor until the voltages are equal, and the energy storage capacitor C1 charges to a stable state. At this point, the first output capacitor C3 provides energy to the load. If the output voltage of the first output capacitor C3 is greater than the output voltage of the second output capacitor C2, then the second diode D2 clamps the capacitor. Since capacitor voltages cannot change abruptly, the output voltage of the second boost circuit module 130 can be the superposition of the voltage across the second output capacitor C2 (the cathode output voltage V1 of the first diode D1) and the voltage across the energy storage capacitor C1, i.e., Vout2 = V1 + V2. After stabilization, the output voltage value is a constant current drive signal Vout2 of 2 × (DC1 + induced voltage). At this time, the boost inductor L1 and the first switch Q1 form boost circuit 1; the second output capacitor C2, the second diode D2, and the energy storage capacitor C1 form charging circuit 2; and the first output capacitor C3 and the load form circuit 3.

[0060] When the first switch Q1 is in the off state, the inductor current in the boost inductor L1 will not change abruptly. Due to the induced voltage source, when the inductor current decreases, the direction of the induced voltage is opposite to the direction of the current. At this time, the boost inductor L1 enters the discharge state. The anode voltage of the first diode D1 is the sum of the first DC signal voltage VDC1 and the induced electromotive force, that is, the anode voltage of the first diode D1 = VDC1 + induced electromotive force. The first diode D1 is turned on, so the energy output by the boost inductor L1 can be used to charge the second output capacitor C2 through the turned-on first diode D1. Then, a stable DC boost signal Vout1 can be output based on the voltage of the second output capacitor C2. The boost inductor L1 and the energy storage capacitor C1 are connected in series and simultaneously provide energy to the load and the first output capacitor C3. After stabilization, the output is a constant current drive signal Vout2 with a voltage value of 2 × (DC1 + induced voltage). At this time, the boost inductor L1, the first diode D1, and the second output capacitor C2 form charging circuit 1; the boost inductor L1, the energy storage capacitor C1, the third diode D3, and the first output capacitor C3 form charging circuit 2.

[0061] As can be seen, the driving circuit provided in this application embodiment can provide a stable high voltage output regardless of whether the first switching transistor Q1 is in the on state or the off state.

[0062] Furthermore, the first boost circuit module 120 in this embodiment of the application also adds detection, open-loop protection, and closed-loop compensation functions. Voltage and current are detected through the second resistor R102, the third resistor R103, the fourth resistor R104, and the detection terminal of the controller unit M1, thereby protecting the circuit. For example, if the voltage value detected by the detection terminal of the controller unit M1 exceeds the set current and voltage value, the circuit will be locked for protection. The expected value Vref given externally can be used as a reference voltage. After being compared and amplified with the voltage of the third pin FB inside the controller unit through an error amplifier, the voltage comparison result Vcomp is output. Finally, the waveform of the drive pulse signal can be changed according to the increase or decrease of the voltage comparison result Vcomp to achieve the closed-loop control effect.

[0063] For example, the motherboard provides a PWM wave with a fixed frequency and varying duty cycle as a pulse input signal Pwm to the controller unit M1 of the first boost circuit module 130. This allows the controller unit M1 to determine the desired value Vref of the reference voltage based on the pulse input signal Pwm. As the duty cycle of the pulse input signal Pwm changes, the desired value Vref of the reference voltage also changes. After the controller unit M1 detects the feedback detection signal Fb1 through the fifth input terminal LED-, it can determine the load current based on the feedback detection signal Fb1. Then, based on the load current and the fixed resistance values ​​of the sixth resistor R106 and the seventh resistor R107 connected to the feedback pin (FB), it determines the detection voltage. For example, when the load is a light-emitting diode (LED) strip, if a constant current control method is used to drive the LED... For LED strip D, controller unit M1 can determine the LED strip current based on the feedback detection signal Fb1 detected at the fifth pin input terminal LED-detection. This LED strip current is then used as the load current. Based on the load current and the fixed resistance values ​​of the sixth resistor R106 and the seventh resistor R107, calculations can be performed. For example, multiplying the fixed resistance values ​​of the sixth resistor R106 and the seventh resistor R107 by the LED strip current yields the detection voltage value. Subsequently, within the controller unit, this detection voltage value is compared with the expected value of the reference voltage Vref using an error amplifier. After comparison, the voltage comparison result Vcomp is output through the error amplifier. Finally, the operating mode is adjusted based on the voltage comparison result Vcomp. The degree of adjustment in the operating mode changes the waveform of the drive pulse signal, thereby changing the output current and achieving a closed-loop control effect.

[0064] Of course, the load type of the driving circuit provided in this application embodiment can be not only LED light strip type, but also other load types that require high voltage, constant current or constant voltage drive. This makes the driving circuit provided in this application embodiment not only applicable to LED lighting systems, but also to other load systems that require high voltage, constant current or constant voltage drive. It has a wide range of applications. For example, it can be applied not only to switching power supplies and LED lighting systems, but also to other industries other than switching power supplies and LED lighting systems. This application embodiment does not make any specific limitations in this regard.

[0065] The detection terminal of the controller unit M1 can be used to detect current or voltage. For example, if the MCU is used as the controller unit M1 in this embodiment, and the six pins of the MCU are shared pins for over-voltage protection / current sensing (OVP / CS), the sixth pin of the controller unit M1 can be used as the detection terminal of the controller unit M1, and electrically connected to the second terminal of the second resistor R102, the first terminal of the third resistor R103, and the first terminal of the first capacitor C101, so that the controller unit M1 can perform voltage and current detection through the OVP / CS shared pin.

[0066] Specifically, when the first switch Q1 is off, the second resistor R102 acts as the upper bias resistor, and the third resistor R103 and the fourth resistor R104 act as the lower bias resistors to divide the voltage. The controller unit M1 can directly detect the output voltage to detect whether there is an overvoltage. When the first switch Q1 is on, the fifth resistor R105 acts as the detection resistor, and the fourth resistor R104 acts as the shunt resistor. The controller unit M1 can detect whether there is an overcurrent by detecting the voltage. For example, inside the controller unit, the voltage value of the detected voltage can be compared with the expected value Vref of the reference voltage through an error amplifier. When the voltage value of the detected voltage exceeds the expected value Vref of the reference voltage, it can be determined that the load current is too large and there is an overcurrent risk. Subsequently, the circuit protection module can be triggered to perform circuit protection to avoid the problem of circuit device burnout caused by overcurrent, thereby achieving voltage protection.

[0067] Optionally, the driving circuit provided in this application embodiment may include, in addition to the transformer circuit module 110, the first boost circuit module 120 and the second boost circuit module 130, other circuit modules, such as a first control circuit module (not shown in the figure), to input a switch control signal to the fourth pin 4-SW of the transformer T0D1 through the first control circuit module. This application embodiment does not impose specific limitations on this.

[0068] In summary, the driving circuit provided in this application embodiment, after the transformer circuit module 110 performs voltage conversion based on the power supply signal, can output a target DC signal to the first boost circuit module 120, so that the first boost circuit module 120 can perform primary boosting of the target DC signal. Subsequently, it outputs a DC boost signal Vout1 to the second boost circuit module 130, so that the second boost circuit module 130 can perform secondary boosting based on the DC boost signal Vout1, output a constant current drive signal Vout2 and a feedback detection signal Fb1 corresponding to the constant current drive signal Vout2, and can transmit the feedback detection signal... The signal Fb1 is fed back to the first boost circuit module 120, enabling the first boost circuit module 120 to perform primary boosting based on the pulse input signal Phm and the feedback detection signal Fb1 fed back by the second boost circuit module 130. This achieves a closed-loop control effect between the first boost circuit module 120 and the second boost circuit module 130. Furthermore, the two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130 reduces the voltage stress on the power devices and ICs required from the output terminal of the transformer T0D1 to the load drive terminal, allowing the front-end devices at the load drive terminal to use components with lower power specifications.

[0069] In a specific implementation, the driving circuit provided in this application embodiment can be integrated into the transformer output driving system as a boost driving circuit for driving loads (such as LED lighting systems). After the transformer output is rectified and filtered, the transformer output driving system first performs a preliminary boost by the first boost circuit module 120. Subsequently, based on the DC boost signal Vout1 output by the first boost circuit module 120, the second boost circuit module 130 performs a secondary boost, which can significantly reduce the voltage at the transformer output terminal (e.g., halve it). This can reduce the voltage stress on the power devices and ICs required from the transformer T0D1 output terminal to the load driving terminal, allowing the front-end devices at the load driving terminal to use components with lower power specifications.

[0070] like Figure 7As shown, this application provides a transformer output drive system 710, which includes a drive circuit 711. The drive circuit 711 is the drive circuit provided in any of the foregoing embodiments of this application. After the transformer circuit module 110 performs voltage conversion based on the power supply signal, the transformer output drive system can output a target DC signal to the first boost circuit module 120. The first boost circuit module 120 performs primary voltage boosting on the target DC signal, and then outputs a DC boost signal Vout1 to the second boost circuit module 130. This allows the second boost circuit module 130 to perform secondary voltage boosting based on the DC boost signal Vout1, outputting a constant current drive signal Vout2. The feedback detection signal Fb1 corresponding to the constant current drive signal Vout2 can be fed back to the first boost circuit module 120, so that the first boost circuit module 120 can perform primary boost based on the pulse input signal Pwm and the feedback detection signal Fb1 fed back by the second boost circuit module 130, thereby realizing the closed-loop control effect of the first boost circuit module 120 and the second boost circuit module 130. In addition, through the two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130, the voltage stress of the power devices and drive IC required from the output terminal of transformer T0D1 to the load drive terminal can be reduced, so that the front-end devices of the load drive terminal can use components with lower power specifications.

[0071] For example, if the first boost circuit module 120 uses a BOOST circuit for primary boosting and the second boost circuit module 130 uses a charge pump boost circuit for secondary boosting, the transformer output drive system can first use the BOOST circuit for initial boosting after the transformer output is rectified and filtered. Subsequently, the charge pump boost circuit is used for secondary boosting to achieve the constant current drive required by the final load based on the BOOST boost and the charge pump secondary boost. This significantly reduces the voltage at the transformer output, and this low voltage advantage extends to all power paths before the charge pump boost, including the rectifier and filter power devices, the BOOST boost power devices, and the driver IC. This reduces the voltage stress on the power devices and driver IC required from the transformer T0D1 output to the load drive, allowing the front-end devices at the load drive to use components with lower power specifications.

[0072] Optional, such as Figure 8As shown, the driving circuit 711 provided in this embodiment further includes: a rectifier bridge and an energy storage filter circuit 810; the input terminal of the rectifier bridge and energy storage filter circuit 810 is used to connect to AC power, and the output terminal of the rectifier bridge and energy storage filter circuit 810 is electrically connected to the power input terminal of the transformer; the rectifier bridge and energy storage filter circuit 810 is used to output a power supply signal to the power input terminal of the transformer based on the AC power, so as to supply power to the transformer circuit module 110 through the input power supply signal.

[0073] In an optional embodiment of this application, the rectifier bridge and energy storage filter circuit 810 may include a bridge rectifier and an energy storage filter capacitor to convert the AC power from the power grid into smooth DC power. This DC power signal can then be used as a power supply signal to the power input terminal of the transformer TOD1 to power the transformer circuit module 110. The power input terminal of the transformer TOD1 is electrically connected to the output terminal of the rectifier bridge and energy storage filter circuit, allowing the DC power output from the rectifier bridge and energy storage filter circuit 810 to be used as a DC power supply signal and transmitted to the power input terminal of the transformer TOD1 to power the transformer circuit module 110.

[0074] In an optional example of this application, the drive circuit 711 can be based on the flyback or LLC topology of the switching power supply. After the transformer T0D1 output in the transformer circuit module 110 is rectified and filtered, it first undergoes primary voltage boosting through the first boost circuit module 120, and then secondary voltage boosting through the second boost circuit module 130. Under the same or optimized transformer T0D1 design, the efficient secondary boosting provides a higher operating voltage to the load, widens the output voltage range of the switching power supply, enhances application applicability, avoids the complexity of setting up multiple independent drive circuits to meet high voltage requirements in existing related technologies, and, combined with efficient topologies such as flyback or LLC and optimized boosting strategies, helps to achieve high overall system efficiency, thereby achieving the goal of high efficiency.

[0075] For example, such as Figure 8As shown, after the AC power from the grid is input, i.e., after the AC power supplied by the grid is input to the drive circuit 711, the drive circuit 711 can convert the grid AC power into smooth DC power through the rectifier bridge and energy storage filter circuit 810. This DC power is then used as a power supply signal and input to the flyback topology circuit 811 used by the transformer T0D1. This allows the control circuit chip 812 in the transformer circuit module 110 to input a switch control signal to the transformer T0D1 in the flyback topology circuit 811 based on the flyback topology architecture corresponding to the flyback topology circuit 811. Through the switch control signal, the flyback switch SW is controlled, thereby enabling the transformer T0D1 to convert primary energy to the secondary output terminal of the transformer T0D1 through the law of electromagnetic induction. The secondary output signal of the transformer T0D1 is output to the rectifier and filter submodule 111 through the secondary output terminal of the transformer. After passing through the rectifier and filter submodule 111, the target DC signal is output to the primary boost circuit 813 of the first boost circuit module 120. The first boost circuit module 120 performs primary boosting on the target DC signal based on the pulse input signal Pwm and the feedback detection signal Fb1 fed back by the second boost circuit module 130. Then, the second boost circuit module 130 performs secondary boosting on the DC boost signal Vout1 output by the first boost circuit module 120, thereby outputting a constant current drive signal Vout2 as the drive signal required by the load, and providing it to the load to realize the constant current drive required by the load.

[0076] The first boost circuit module 120 may include a drive control circuit 814 and a primary boost circuit 813. The first boost circuit module 120 can receive an externally input pulse input signal Pwm and a feedback detection signal Fb1 from the second boost circuit module 130 via the drive control circuit 814. Based on the pulse input signal Pwm and the feedback detection signal Fb1 from the second boost circuit module 130, it performs primary boosting on the target DC signal and outputs a DC boost signal Vout1 to the second boost circuit module 130. The second boost circuit module 130 then uses the second boost circuit module 130 to... The DC boost signal Vout1 output by the boost circuit module 120 is boosted in the secondary stage to achieve secondary boost through the two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130. This reduces the voltage stress on the power devices and ICs required from the transformer output to the load drive end, allowing the front-end devices at the load drive end to use components with lower power specifications. This reduces the specifications and cost of the front-end devices, thereby solving the technical problems in existing power supply technology, such as high system cost, large size, and difficulty in meeting the requirements for thinness and lightness, caused by the high voltage stress required for power devices.

[0077] In specific implementations, the driving circuit 711 provided in this application embodiment can be widely used in various switching power supply output driving scenarios, especially suitable for constant current driving systems that are sensitive to cost, size, and efficiency. For example, it can be applied to LED lighting systems and power motherboard systems of various electronic products that require high-efficiency constant current driving. This allows the switching power supply to significantly reduce the voltage stress on the power devices and driving ICs required from the output terminal of the transformer T0D1 to the load driving terminal through a two-stage boost structure. This allows the front-end devices at the load driving terminal to use lower power specifications and lower cost components (such as MOSFETs, diodes, capacitors, etc.), which are usually the main components of the cost of switching power supplies. This significantly reduces the overall system cost. Furthermore, using low-voltage components usually means a smaller package size, which helps to achieve a thinner and lighter design of the switching power supply and improve power density.

[0078] like Figure 9 As shown, this application provides an electronic device 900, which includes a driving circuit 711 provided in any of the foregoing embodiments of this application. The electronic device 900 can achieve the constant current drive required by the final load through the driving circuit 711, and can achieve secondary voltage boost through a two-stage boost structure composed of the first boost circuit module 120 and the second boost circuit module 130. This reduces the voltage stress on the power devices and ICs required from the transformer output terminal to the load drive terminal, allowing the front-end devices at the load drive terminal to use components with lower power specifications. This solves the technical problems of high system cost, large size, and difficulty in meeting the requirements for thinness and lightness caused by the high voltage stress required by the power devices in the existing power supply technology.

[0079] The electronic devices may include, but are not limited to, televisions, tablets, etc., but this application does not limit this.

[0080] It should be noted that the embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0081] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0082] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0083] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A driving circuit, characterized in that, Includes: a transformer circuit module, a first boost circuit module, and a second boost circuit module; The transformer circuit module is used to perform voltage conversion based on the power supply signal and output the target DC signal; The first boost circuit module is used to perform primary boosting of the target DC signal based on the pulse input signal and the feedback detection signal fed back by the second boost circuit module, and output a DC boost signal. The second boost circuit module is used to perform secondary boost based on the DC boost signal, and output a constant current drive signal and the feedback detection signal.

2. The driving circuit according to claim 1, characterized in that, The first boost circuit module includes: a boost inductor, a first diode, a second output capacitor, a first switching transistor, and a drive control submodule; The first end of the boost inductor serves as the DC input terminal of the first boost circuit module and is electrically connected to any one of the output terminals of the transformer circuit module. Any one of the output terminals of the transformer circuit module is used to output the target DC signal. The second terminal of the boost inductor serves as the first connection terminal of the first boost circuit module, and is electrically connected to the first terminal of the second boost circuit module, the second terminal of the first switching transistor, and the anode of the first diode. The cathode of the first diode, the first terminal of the second output capacitor, and the input terminal of the second boost circuit module are electrically connected; The first terminal of the first switching transistor is electrically connected to the first terminal of the drive control submodule, and the third terminal of the first switching transistor and the second terminal of the second output capacitor are electrically connected to the reference ground of the first boost circuit module. The drive control submodule is used to: output a drive pulse signal to the first switching transistor based on the pulse input signal and the feedback detection signal fed back by the second boost circuit module, so as to control the state of the first switching transistor through the drive pulse signal, so that the first boost circuit module outputs the DC boost signal based on the voltage of the second output capacitor.

3. The driving circuit according to claim 2, characterized in that, The drive control submodule includes: a controller unit, a first resistor, a second resistor, a third resistor, and a fourth resistor; The drive control terminal of the controller unit serves as the first terminal of the drive control submodule and is electrically connected to the first terminal of the first switching transistor through the first resistor. The first end of the second resistor is electrically connected to the anode of the first diode. The second end of the second resistor, the first end of the third resistor, and the detection terminal of the controller unit are electrically connected. The second end of the third resistor, the third end of the first switching transistor, and the first end of the fourth resistor are electrically connected. The second end of the fourth resistor is electrically connected to the reference ground of the drive circuit. The controller unit is specifically used to: determine a reference voltage based on the pulse input signal, and determine a working mode based on the reference voltage and the detection voltage corresponding to the detection terminal of the controller unit, so as to output the drive pulse signal according to the working mode.

4. The driving circuit according to claim 1, characterized in that, The second boost circuit module includes: an energy storage capacitor, a first output capacitor, a second diode, a third diode, and a load resistor; Wherein, the first end of the energy storage capacitor is electrically connected to the first connection end of the first boost circuit module, and the second end of the energy storage capacitor, the cathode of the second diode, and the anode of the third diode are electrically connected; The anode of the second diode serves as the input terminal of the second boost circuit module and is electrically connected to the output terminal of the first boost circuit module. The output terminal of the first boost circuit module is used to output the DC boost signal. The cathode of the third diode, the first end of the load resistor, and the first end of the first output capacitor are electrically connected to the output end of the second boost circuit module. The output end of the second boost circuit module is used to output the constant current drive signal. The second end of the load resistor is electrically connected to the feedback input terminal of the first boost circuit module, and the second end of the load resistor is used to output the feedback detection signal; The second terminal of the first output capacitor is electrically connected to the reference ground of the driving circuit.

5. The driving circuit according to any one of claims 1 to 4, characterized in that, The transformer circuit module includes: a transformer and a rectifier and filter submodule. The secondary output terminal of the transformer is electrically connected to the input terminal of the rectifier and filter submodule, and the output terminal of the rectifier and filter submodule is electrically connected to the DC input terminal of the first boost circuit module. The transformer is used to step down the voltage based on the power supply signal and output the transformer secondary output signal. The rectifier and filter submodule is used to perform rectification and filtering based on the secondary output signal of the transformer to output at least one DC signal, wherein the at least one DC signal includes the target DC signal.

6. The driving circuit according to claim 5, characterized in that, The rectifier and filter submodule includes: rectifier and filter branches that are connected one-to-one with the secondary output terminals of the transformer; The secondary output terminal of the transformer is used to output the secondary output signal of the transformer; Each of the rectifier-filter branches is used to rectify and filter the output signal of the transformer secondary to output a DC signal.

7. The driving circuit according to claim 6, characterized in that, The rectifier branch includes: a rectifier diode and a filter capacitor; The anode of the rectifier diode serves as the input terminal of the rectifier filter branch and is electrically connected to the secondary output terminal of the transformer. The cathode of the rectifier diode is electrically connected to the first terminal of the filter capacitor, serving as the output terminal of the rectifier-filter branch; The second terminal of the filter capacitor is electrically connected to the reference ground of the transformer output drive circuit.

8. The driving circuit according to claim 5, characterized in that, Also includes: Rectifier bridge and energy storage filter circuit; The input terminal of the rectifier bridge and energy storage filter circuit is used to connect to AC power, and the output terminal of the rectifier bridge and energy storage filter circuit is electrically connected to the power input terminal of the transformer. The rectifier bridge and energy storage filter circuit are used to output a power supply signal to the power input terminal of the transformer based on the AC power.

9. The driving circuit according to claim 1, characterized in that, The power supply signal is either an AC power supply signal or a DC power supply signal.

10. An electronic device, characterized in that, It includes the driving circuit as described in any one of claims 1-9.

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