Power conversion circuit, charger, and electronic device

Abstract

The present disclosure provides a power conversion circuit, a charger and an electronic device. The power conversion circuit comprises a power input end, a power output end, a full-bridge circuit and a clamping circuit. The power input end comprises a first power input end and a second power input end, one of which is used to connect to a positive electrode and the other of which is used to connect to a negative electrode. The power output end comprises a first power output end and a second power output end. The full-bridge circuit comprises two groups of bridge arm circuits, each of which comprises an upper bridge arm and a lower bridge arm connected in series between the first power output end and the second power output end. The power input end is connected between the upper bridge arm and the lower bridge arm of the same group of bridge arm circuits. The clamping circuit is connected between the power input end and the full-bridge circuit, and is used to control the upper bridge arm of one group of bridge arm circuits to be turned on and the lower bridge arm of the other group of bridge arm circuits to be turned on, so that the first power output end outputs a positive voltage and the second power output end outputs a negative voltage. For input voltages of different polarities, the polarity of the output voltage remains unchanged.

Description

Technical Field

[0001] This disclosure relates to the field of DC-DC converter technology, and more particularly to a power conversion circuit, charger, and electronic device. Background Technology

[0002] Power conversion circuits have wide applications in DC power distribution networks, electric vehicles, and distributed energy resources. When using power conversion circuits, it is necessary to distinguish the direction of power supply application, which requires certain knowledge from the user. Connecting the power supply with the wrong polarity can damage the circuit and the load.

[0003] Currently, the main method to avoid incorrect power supply polarity is through structural orientation restrictions. However, due to differences in structural designs and circuit interfaces among different manufacturers, the adaptability of power conversion circuits is relatively low. Utility Model Content

[0004] This disclosure provides a highly adaptable power conversion circuit, charger, and electronic device.

[0005] This disclosure provides a power conversion circuit, including:

[0006] The power input terminal includes a first power input terminal and a second power input terminal, one of which is used to connect to the positive terminal and the other is used to connect to the negative terminal.

[0007] The power output terminals include a first power output terminal and a second power output terminal.

[0008] The full-bridge circuit includes two sets of bridge arm circuits. Each bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series between the first power output terminal and the second power output terminal. The power input terminal is connected between the upper bridge arm and the lower bridge arm of the same set of bridge arm circuits.

[0009] A clamping circuit, connected to the power input terminal and the full-bridge circuit, is used to control the upper bridge arm of one set of bridge arm circuits to conduct and the lower bridge arm of another set of bridge arm circuits to conduct, so that the first power output terminal outputs a positive voltage and the second power output terminal outputs a negative voltage.

[0010] The power conversion circuit includes a clamping circuit, which connects the power input terminal and the full-bridge circuit. This allows control over the conduction of different groups of upper and lower bridge arms, ensuring that the first power output terminal maintains a positive output voltage and the second power output terminal maintains a negative output voltage. The polarity of the power output terminal remains unchanged, thus the polarity of the power output terminal is not affected by the polarity of the power input terminal. The power conversion circuit can adapt to input voltages of different polarities, exhibiting high adaptability.

[0011] In some possible implementations, the clamping circuit includes a diode connected to the power input terminal and the full-bridge circuit, used to control the upper arm of one set of bridge arm circuits to conduct and the lower arm of another set of bridge arm circuits to conduct, so that the first power output terminal outputs a positive voltage and the second power output terminal outputs a negative voltage.

[0012] Using diodes as clamping circuits offers fast response and simple, easy-to-implement circuitry.

[0013] In some possible implementations, one set of bridge arm circuits includes a first upper bridge arm and a first lower bridge arm, and another set of bridge arm circuits includes a second upper bridge arm and a second lower bridge arm. The diodes include a first diode and a second diode. One end of the first diode is connected to the first power input terminal, and the other end is connected to the first upper bridge arm and the second lower bridge arm. One end of the second diode is connected to the second power input terminal, and the other end is connected to the second upper bridge arm and the first lower bridge arm. The first diode and the second diode are connected to the power input terminal with the same polarity.

[0014] The first diode and the second diode are connected to the power input terminal with the same polarity. When the polarity of the power input terminal changes, the output signals of the first diode and the second diode change accordingly. The first diode is used to control the on / off state of the first upper bridge arm and the second lower bridge arm, and the second diode is used to control the on / off state of the second upper bridge arm and the first lower bridge arm. When the output signals of the first diode and the second diode change, the circuits that were originally conducting in the first upper bridge arm and the first lower bridge arm, and the circuits that were originally turning off in the second upper bridge arm and the second lower bridge arm, become conducting, so that the polarity of the power output terminal remains unchanged.

[0015] In some possible implementations, the power conversion circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected between the first diode and the first upper bridge arm, and the first diode is used to control the on / off state of the first driving circuit. The second driving circuit is connected between the second diode and the second upper bridge arm, and the second diode is used to control the on / off state of the second driving circuit.

[0016] The first diode controls the on / off state of the first driving circuit, thereby controlling the on / off state of the first upper bridge arm; the second diode controls the on / off state of the second driving circuit, thereby controlling the on / off state of the second upper bridge arm; the driving circuit can amplify and enhance the control signal, and by controlling the bridge arm circuit through the driving circuit, the driving capability can be enhanced, which is beneficial to improving the efficiency and stability of the circuit.

[0017] In some possible implementations, the power conversion circuit further includes a third driving circuit and a fourth driving circuit. The third driving circuit is connected between the second diode and the first lower bridge arm, and the second diode is used to control the on / off state of the third driving circuit. The fourth driving circuit is connected between the first diode and the second lower bridge arm, and the first diode is used to control the on / off state of the fourth driving circuit.

[0018] By controlling the first lower bridge arm through the third drive circuit and the second lower bridge arm through the fourth drive circuit, the driving capability can be enhanced, which is beneficial to improving the efficiency and stability of the circuit.

[0019] In some possible implementations, the first driving circuit includes a first driving transistor with a first controllable terminal, and a first diode connected to the first controllable terminal; the second driving circuit includes a second driving transistor with a second controllable terminal, and a second diode connected to the second controllable terminal.

[0020] The first and second driver transistors can amplify the control signal, have high driving capability, are easy to control, have low cost, and high reliability.

[0021] In some possible implementations, the power conversion circuit further includes a soft-start circuit connected between the full-bridge circuit and the power output terminal.

[0022] A soft-start circuit can mitigate the impact on the circuit when a high-power load is connected to the power output terminal, thereby improving the circuit's stability.

[0023] In some possible implementations, the soft-start circuit includes a soft-start transistor, which includes a third controllable terminal, a first terminal, and a second terminal. The third controllable terminal is connected to the first power output terminal, the first terminal of the soft-start transistor is connected to the full-bridge circuit, and the second terminal of the soft-start transistor is connected to the second power output terminal.

[0024] The turn-on of a slow-start transistor requires a certain amount of time, which can mitigate the impact of high-power loads on the circuit.

[0025] In some possible implementations, the soft-start circuit further includes a first soft-start resistor and a second soft-start resistor, wherein the first soft-start resistor is connected to the first power output terminal and the third controllable terminal, and the second soft-start resistor is connected to the first terminal and the third controllable terminal of the soft-start transistor.

[0026] The first and second soft-start resistors cause the current in the third controllable terminal and the first terminal of the soft-start transistor to gradually increase, and the soft-start transistor gradually turns on, which can mitigate the impact of high-power loads on the circuit.

[0027] This application also provides a charger, including the power conversion circuit as described in any of the preceding claims.

[0028] This application also provides an electronic device, including the charger described above.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0031] Figure 1 The diagram shown is a circuit diagram of one embodiment of the power conversion circuit of this disclosure.

[0032] Figure 2 The diagram shown is a circuit diagram of another embodiment of the power conversion circuit of this disclosure.

[0033] Figure 3 The diagram shown is a circuit diagram of another embodiment of the power conversion circuit of this disclosure. Detailed Implementation

[0034] This disclosure provides a power conversion circuit, a charger, and an electronic device. The power conversion circuit, charger, and electronic device of this disclosure will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0035] Figure 1 The diagram shown is a circuit diagram of one embodiment of the power conversion circuit 10 of this disclosure. Figure 1 As shown, the power conversion circuit 10 includes: a power input terminal, a power output terminal, a full-bridge circuit, and a clamping circuit.

[0036] The power input terminals include a first power input terminal I1 and a second power input terminal I2, one of which is used to connect to the positive terminal of the input power supply, and the other is used to connect to the negative terminal of the input power supply. The power input terminals are used to connect to the input power supply. When the first power input terminal I1 is connected to the positive terminal of the input power supply, the second power input terminal I2 is connected to the negative terminal of the input power supply. When the first power input terminal I1 is connected to the negative terminal of the input power supply, the second power input terminal I2 is connected to the positive terminal of the input power supply.

[0037] The power output terminals include a first power output terminal O1 and a second power output terminal O2. These power output terminals are used to connect to the load and output voltage to it.

[0038] The full-bridge circuit includes two sets of bridge arm circuits. Each bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series between the first power output terminal O1 and the second power output terminal O2. The power input terminal is connected between the upper and lower bridge arms of the same set of bridge arm circuits.

[0039] The clamping circuit connects the power input terminal and the full-bridge circuit. It controls the upper arm of one set of bridge arm circuits and the lower arm of another set of bridge arm circuits to conduct based on the positive and negative polarities of the first power input terminal I1 and the second power input terminal I2. This causes the first power output terminal to output a positive voltage, and the second power output terminal to output a negative voltage. It can be understood that the clamping circuit controls the upper arm of one set of bridge arm circuits and the lower arm of another set of bridge arm circuits to conduct, while the remaining upper and lower arms are deactivated.

[0040] For example, consider two sets of bridge arm circuits, namely the first set of bridge arm circuits and the second set of bridge arm circuits. When the first power input terminal I1 is connected to the positive terminal of the input power supply and the second power input terminal I2 is connected to the negative terminal of the input power supply, the clamping circuit controls the upper bridge arm of the first set of bridge arm circuits and the lower bridge arm of the second set of bridge arm circuits to be turned on, and the lower bridge arm of the first set of bridge arm circuits and the upper bridge arm of the second set of bridge arm circuits to be turned off, so that the first power output terminal outputs a positive voltage and the second power output terminal outputs a negative voltage.

[0041] When the first power input terminal I1 is connected to the negative terminal of the input power supply and the second power input terminal I2 is connected to the positive terminal of the input power supply, the clamping circuit controls the lower bridge arm of the first group of bridge arm circuits and the upper bridge arm of the second group of bridge arm circuits to be turned on and the upper bridge arm of the first group of bridge arm circuits and the lower bridge arm of the second group of bridge arm circuits to be turned off. Similarly, the first power output terminal can output a positive voltage and the second power output terminal can output a negative voltage.

[0042] Thus, when the polarity of the first power input terminal I1 and the second power input terminal I2 changes, the output signal of the clamping circuit changes accordingly. The clamping circuit controls the upper and lower bridge arm circuits of different groups to conduct, so that the polarity of the voltage output by the first power output terminal O1 and the second power output terminal O2 remains unchanged.

[0043] In some possible implementations, one set of bridge arm circuits includes a first upper bridge arm Q1 and a first lower bridge arm Q3, and another set of bridge arm circuits includes a second upper bridge arm Q2 and a second lower bridge arm Q4. The first upper bridge arm Q1 and the first lower bridge arm Q3 are connected in series between a first power output terminal O1 and a second power output terminal O2. The first upper bridge arm Q1 is connected between the first power output terminal O1 and the first lower bridge arm Q3. A first power input terminal I1 is connected between the first upper bridge arm Q1 and the first lower bridge arm Q3. The second upper bridge arm Q2 and the second lower bridge arm Q4 are connected in series between the first power output terminal O1 and the second power output terminal O2. The second upper bridge arm Q2 is connected between the first power output terminal O1 and the second lower bridge arm Q4. A second power input terminal I2 is connected between the second upper bridge arm Q2 and the second lower bridge arm Q4.

[0044] By controlling the conduction states of the first upper bridge arm Q1, the second upper bridge arm Q2, the first lower bridge arm Q3, and the second lower bridge arm Q4 through a clamping circuit, the input voltage at the power input terminal can be converted into the output voltage at the power output terminal. When the first power input terminal I1 is connected to the positive terminal of the input power supply and the second power input terminal I2 is connected to the negative terminal of the input power supply, the first upper bridge arm Q1 and the second lower bridge arm Q4 are turned on, while the second upper bridge arm Q2 and the first lower bridge arm Q3 are turned off. The first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage. When the first power input terminal I1 is connected to the negative terminal of the input power supply and the second power input terminal I2 is connected to the positive terminal of the input power supply, the first upper bridge arm Q1 and the second lower bridge arm Q4 are turned off, while the second upper bridge arm Q2 and the first lower bridge arm Q3 are turned on. The first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0045] Optionally, the power conversion circuit 10 includes an active bridge converter circuit. The first upper bridge arm Q1, the second upper bridge arm Q2, the first lower bridge arm Q3, and the second lower bridge arm Q4 each include a transistor. By controlling the on / off state of the transistors, the on / off state of the corresponding bridge arm circuit can be controlled. Transistors are easy to control and have a fast response speed, which can improve the conversion efficiency of the power conversion circuit 10.

[0046] Understandably, the clamping circuit connects the power input terminal and the full-bridge circuit to control the conduction of the upper bridge arm of one set of bridge arm circuits and the conduction of the lower bridge arm of another set of bridge arm circuits, so that the first power output terminal O1 outputs a positive voltage and the second power output terminal O2 outputs a negative voltage.

[0047] When the polarity of the power input terminal changes, the output signal of the clamping circuit changes accordingly, controlling the conduction of different groups of upper and lower bridge arms. For example, when the first power input terminal I1 is connected to the positive terminal and the second power input terminal I2 is connected to the negative terminal, the clamping circuit causes the first upper bridge arm Q1 and the second lower bridge arm Q4 to conduct, while the second upper bridge arm Q2 and the first lower bridge arm Q3 are turned off. The first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage. When the first power input terminal I1 is connected to the negative terminal of the input power supply and the second power input terminal I2 is connected to the positive terminal of the input power supply, the clamping circuit controls the first upper bridge arm Q1 and the second lower bridge arm Q4 to turn off, while the second upper bridge arm Q2 and the first lower bridge arm Q3 are conducted. The first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0048] The power conversion circuit 10 includes a clamping circuit, which connects the power input terminal and the full-bridge circuit. This allows control over the conduction of different groups of upper and lower bridge arms. When the polarity of the power input terminal changes, the first power output terminal O1 maintains a positive output voltage, and the second power output terminal O2 maintains a negative output voltage. The polarity of the power output terminal remains unchanged. Therefore, the polarity of the power output terminal is not affected by the polarity of the power input terminal. The power conversion circuit 10 can adapt to input voltages of different polarities, and has high adaptability.

[0049] The power conversion circuit 10 disclosed herein can automatically convert the output voltage to the polarity required by the load when the polarity of the input power is uncertain, thereby providing appropriate power supply to the load, avoiding damage to the circuit caused by improper operation by the user, and reducing the difficulty of operation for the user.

[0050] In some possible implementations, the clamping circuit includes a diode connected to the power input terminal and the full-bridge circuit, used to control the upper arm of one set of bridge arm circuits to conduct and the lower arm of another set of bridge arm circuits to conduct, so that the first power output terminal O1 outputs a positive voltage and the second power output terminal O2 outputs a negative voltage.

[0051] Diodes exhibit unidirectional conductivity; their resistance is very low when forward-biased and very high when reverse-biased. When the voltage at the power input is higher than the diode's forward voltage, the diode conducts, clamping the output voltage to a level close to the power input voltage. When the power input voltage is lower than the diode's forward voltage, the diode is cut off. Changing the polarity of the power supply connected to the input changes the diode's state, resulting in different output potentials. This controls the conduction of different sets of upper and lower bridge arms, ensuring the polarity of the power output remains constant. Using diodes as a clamping circuit offers fast response and a simple, easy-to-implement circuit.

[0052] In some possible implementations, the diodes include a first diode D1 and a second diode D2. One end of the first diode D1 is connected to the first power input terminal I1, and the other end is connected to the first upper bridge arm Q1 and the second lower bridge arm Q4. One end of the second diode D2 is connected to the second power input terminal I2, and the other end is connected to the second upper bridge arm Q2 and the first lower bridge arm Q3. The first diode D1 is connected between the first power input terminal I1 and the first upper bridge arm Q1, and also between the first power input terminal I1 and the second lower bridge arm Q4, for controlling the on / off state of the first upper bridge arm Q1 and the second lower bridge arm Q4. The second diode D2 is connected between the second power input terminal I2 and the second upper bridge arm Q2, and also between the second power input terminal I2 and the first lower bridge arm Q3, for controlling the on / off state of the second upper bridge arm Q2 and the first lower bridge arm Q3. The first diode D1 and the second diode D2 are connected to the power input terminal with the same polarity.

[0053] The first diode D1 and the second diode D2 are connected to the power input terminal with the same polarity. When the polarity of the power input terminal is changed, the output signals of the first diode D1 and the second diode D2 change accordingly.

[0054] exist Figure 1 In the illustrated embodiment, the anodes of the first diode D1 and the second diode D2 are connected to the power input terminal. The first upper bridge arm Q1, the second upper bridge arm Q2, the first lower bridge arm Q3, and the second lower bridge arm Q4 all include NMOS transistors.

[0055] When the first power input terminal I1 is connected to the positive terminal of the input power supply and the second power input terminal I2 is connected to the negative terminal of the input power supply, the first diode D1 outputs a high level, the second diode D2 outputs a low level, the first upper bridge arm Q1 and the second lower bridge arm Q4 are turned on, the second upper bridge arm Q2 and the first lower bridge arm Q3 are turned off, the first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0056] When the first power input terminal I1 is connected to the negative terminal of the input power supply and the second power input terminal I2 is connected to the positive terminal of the input power supply, the first diode D1 outputs a low level, the second diode D2 outputs a high level, the first upper bridge arm Q1 and the second lower bridge arm Q4 are turned off, the second upper bridge arm Q2 and the first lower bridge arm Q3 are turned on, the first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0057] The first diode D1 is used to control the on / off state of the first upper bridge arm Q1 and the second lower bridge arm Q4, and the second diode D2 is used to control the on / off state of the second upper bridge arm Q2 and the first lower bridge arm Q3. When the output signals of the first diode D1 and the second diode D2 change, the circuits that were originally conducting in the first upper bridge arm Q1 and the first lower bridge arm Q4, and the circuits that were originally turning off in the second upper bridge arm Q2 and the second lower bridge arm Q3, become turning off, and the circuits that were originally turning off become conducting, so that the polarity of the power supply output terminal remains unchanged.

[0058] Figure 2 The diagram shown is a circuit diagram of another embodiment of the power conversion circuit 10 of this disclosure.

[0059] The power conversion circuit 10 includes a first driving circuit S1 and a second driving circuit S2. The first driving circuit S1 is connected between a first diode D1 and a first upper bridge arm Q1, and the first diode D2 is used to control the on / off state of the first driving circuit S1. The second driving circuit S2 is connected between a second diode D2 and a second upper bridge arm Q2, and the second diode D2 is used to control the on / off state of the second driving circuit D2.

[0060] exist Figure 2 In the embodiment shown, the first upper bridge arm Q1 and the second upper bridge arm Q2 include PMOS transistors, and the first lower bridge arm Q3 and the second lower bridge arm Q4 include NMOS transistors.

[0061] When the first power input terminal I1 is connected to the positive terminal of the input power supply and the second power input terminal I2 is connected to the negative terminal of the input power supply, the first diode D1 outputs a high level and the second diode D2 outputs a low level. The first drive circuit S1 is turned on, the first upper bridge arm Q1 is turned on, and the second lower bridge arm Q4 is turned on. When the second drive circuit S2 is turned off, the second upper bridge arm Q2 is turned off, the first lower bridge arm Q3 is turned off, the first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0062] When the first power input terminal I1 is connected to the negative terminal of the input power supply and the second power input terminal I2 is connected to the positive terminal of the input power supply, the first diode D1 outputs a low level and the second diode D2 outputs a high level. The first drive circuit S1 is turned off, the first upper bridge arm Q1 is turned off, and the second lower bridge arm Q4 is turned off. The second drive circuit S2 is turned on, the second upper bridge arm Q2 is turned on, the first lower bridge arm Q3 is turned on, the first power output terminal O1 outputs a positive voltage, and the second power output terminal O2 outputs a negative voltage.

[0063] The first diode D1 controls the on / off state of the first driving circuit S1, thereby controlling the on / off state of the first upper bridge arm Q1; the second diode D2 controls the on / off state of the second driving circuit S2, thereby controlling the on / off state of the second upper bridge arm Q2; the driving circuit can amplify and enhance the control signal, and by controlling the bridge arm circuit through the driving circuit, the driving capability can be enhanced, which is beneficial to improving the efficiency and stability of the circuit.

[0064] In some possible implementations, the first driving circuit S1 includes a first driving transistor Q5, which includes a first controllable terminal, and a first diode D1 is connected to the first controllable terminal; the second driving circuit S2 includes a second driving transistor Q6, which includes a second controllable terminal, and a second diode D2 is connected to the second controllable terminal.

[0065] like Figure 2 As shown, the first driving transistor Q5 and the second driving transistor Q6 are NPN transistors. When the first diode D1 outputs a high level and the second diode D2 outputs a low level, the first driving circuit S1 is turned on and the second driving circuit S2 is turned off; when the first diode D1 outputs a low level and the second diode D2 outputs a high level, the first driving circuit S1 is turned off and the second driving circuit S2 is turned on.

[0066] The first driver transistor Q5 and the second driver transistor Q6 can amplify the control signal, have high driving capability, are easy to control, have low cost, and high reliability.

[0067] In some possible implementations, the first driving circuit S1 further includes a first driving resistor R13 connected between the first diode D1 and the first controllable terminal; the second driving circuit S2 further includes a second driving resistor R14 connected between the second diode D2 and the second controllable terminal.

[0068] The first driving resistor R13 and the second driving resistor R14 can limit the current to the first controllable terminal and the second controllable terminal, preventing excessive current from damaging the first driving transistor Q5 and the second driving transistor Q6, thus protecting the circuit.

[0069] Figure 3 The diagram shown is a circuit diagram of another embodiment of the power conversion circuit 10 of this disclosure.

[0070] The power conversion circuit 10 also includes a third driving circuit S3 and a fourth driving circuit S4. The third driving circuit S3 is connected between the second diode D2 and the first lower bridge arm Q3, and the second diode D2 is used to control the on / off state of the third driving circuit S3. The fourth driving circuit S4 is connected between the first diode D1 and the second lower bridge arm Q4, and the first diode D1 is used to control the on / off state of the fourth driving circuit S4.

[0071] The third driving circuit S3 includes a third driving transistor Q7, and the fourth driving circuit S4 includes a fourth driving transistor Q8. Both the third driving transistor Q7 and the fourth driving transistor Q8 are PNP transistors. When the first diode D1 outputs a high level and the second diode D2 outputs a low level, the third driving circuit S3 is turned on, and the fourth driving circuit S4 is turned off. When the first diode D1 outputs a low level and the second diode D2 outputs a high level, the third driving circuit S3 is turned off, and the fourth driving circuit S4 is turned on.

[0072] By controlling the first lower bridge arm Q3 through the third drive circuit S3 and the second lower bridge arm Q4 through the fourth drive circuit S4, the driving capability can be enhanced, which is beneficial to improving the efficiency and stability of the circuit.

[0073] In some possible implementations, the clamping circuit further includes a capacitor connected between the first power input terminal I1 and the second power input terminal I2. (See reference) Figures 1-3 The capacitor includes capacitors C1, C2, and C3.

[0074] The capacitor can store charge and stabilize the output levels of the first diode D1 and the second diode D2, thereby clamping the signal.

[0075] refer to Figure 1 In some possible implementations, the power conversion circuit 10 further includes a soft-start circuit 11 connected between the full-bridge circuit and the power output terminal.

[0076] A soft-start circuit can mitigate the impact on the circuit when a high-power load is connected to the power output terminal, thereby improving the circuit's stability.

[0077] In some possible implementations, the soft-start circuit 11 includes a soft-start transistor Q14, which includes a third controllable terminal, a first terminal, and a second terminal. The third controllable terminal is connected to the first power output terminal O1, the first terminal of the soft-start transistor Q14 is connected to the full-bridge circuit, and the second terminal of the soft-start transistor Q14 is connected to the second power output terminal O2.

[0078] The turn-on of a slow-start transistor requires a certain amount of time, which can mitigate the impact of high-power loads on the circuit.

[0079] In some possible implementations, the soft-start circuit 11 further includes a first soft-start resistor R66 and a second soft-start resistor R73. The first soft-start resistor R66 is connected to the first power output terminal O1 and the third controllable terminal, and the second soft-start resistor R73 is connected to the first terminal and the third controllable terminal of the soft-start transistor Q14.

[0080] The first and second slow-start resistors R66 and R73 gradually increase the current at the third controllable terminal and the first terminal of the slow-start transistor Q14, causing the slow-start transistor Q14 to gradually turn on, thus mitigating the impact of high-power loads on the circuit.

[0081] In some possible implementations, the power conversion circuit 10 further includes a bidirectional transient voltage suppressor diode (TVS) connected between the first power input terminal I1 and the second power input terminal I2.

[0082] A bidirectional transient voltage suppressor diode (TVS) can absorb transient energy and prevent transient overvoltage from affecting the circuit.

[0083] This application also provides a charger, including the power conversion circuit 10 as described above. The power conversion circuit 10 can convert the input voltage of the charger into an output voltage to power the load. When the polarity of the power supply connected to the charger changes, the polarity of its output voltage will not change, thus enabling normal power supply to the load. The charger does not require distinguishing the polarity of the power supply during use, reducing the difficulty of use and improving the user experience.

[0084] The charger in this application includes a high-power charger. When a high-power load is connected, the high-power load will not cause an impact on the circuit due to the soft-start circuit 11, and the circuit has high stability.

[0085] The charger described in this application can be used in various fields such as DC power distribution networks, electric vehicles, and distributed energy.

[0086] This application also provides an electronic device, including the charger described above.

[0087] The electronic devices covered in this application include mobile phones, tablets, laptops, smartwatches, wireless headphones, game consoles, electronic dictionaries, and power banks. The charger can be connected to an external power source to charge the electronic devices. The charger can continue to charge the electronic devices even when the polarity of the external power source is changed.

Claims

1. A power conversion circuit, characterized in that, include: The power input terminal includes a first power input terminal and a second power input terminal, one of which is used to connect to the positive terminal and the other is used to connect to the negative terminal. The power output terminals include a first power output terminal and a second power output terminal. The full-bridge circuit includes two sets of bridge arm circuits. Each bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series between the first power output terminal and the second power output terminal. The power input terminal is connected between the upper bridge arm and the lower bridge arm of the same set of bridge arm circuits. A clamping circuit, connected to the power input terminal and the full-bridge circuit, is used to control the upper bridge arm of one set of bridge arm circuits to conduct and the lower bridge arm of another set of bridge arm circuits to conduct, so that the first power output terminal outputs a positive voltage and the second power output terminal outputs a negative voltage.

2. The power conversion circuit according to claim 1, characterized in that, The clamping circuit includes a diode connected to the power input terminal and the full-bridge circuit, used to control the upper bridge arm of one set of bridge arm circuits to conduct and the lower bridge arm of another set of bridge arm circuits to conduct, so that the first power output terminal outputs a positive voltage and the second power output terminal outputs a negative voltage.

3. The power conversion circuit according to claim 2, characterized in that, One set of bridge arm circuits includes a first upper bridge arm and a first lower bridge arm, and the other set of bridge arm circuits includes a second upper bridge arm and a second lower bridge arm. The diodes include a first diode and a second diode. One end of the first diode is connected to the first power input terminal, and the other end is connected to the first upper bridge arm and the second lower bridge arm. One end of the second diode is connected to the second power input terminal, and the other end is connected to the second upper bridge arm and the first lower bridge arm. The first diode and the second diode are connected to the power input terminal with the same polarity.

4. The power conversion circuit according to claim 3, characterized in that, The power conversion circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected between the first diode and the first upper bridge arm, and the first diode is used to control the on / off state of the first driving circuit. The second driving circuit is connected between the second diode and the second upper bridge arm, and the second diode is used to control the on / off state of the second driving circuit.

5. The power conversion circuit according to claim 4, characterized in that, The power conversion circuit further includes a third driving circuit and a fourth driving circuit. The third driving circuit is connected between the second diode and the first lower bridge arm, and the second diode is used to control the on / off state of the third driving circuit. The fourth driving circuit is connected between the first diode and the second lower bridge arm, and the first diode is used to control the on / off state of the fourth driving circuit.

6. The power conversion circuit according to claim 4, characterized in that, The first driving circuit includes a first driving transistor, the first driving transistor includes a first controllable terminal, and the first diode is connected to the first controllable terminal; the second driving circuit includes a second driving transistor, the second driving transistor includes a second controllable terminal, and the second diode is connected to the second controllable terminal.

7. The power conversion circuit according to claim 1, characterized in that, The power conversion circuit also includes a soft-start circuit connected between the full-bridge circuit and the power output terminal.

8. The power conversion circuit according to claim 7, characterized in that, The soft-start circuit includes a soft-start transistor, which includes a third controllable terminal, a first terminal, and a second terminal. The third controllable terminal is connected to the first power output terminal, the first terminal of the soft-start transistor is connected to the full-bridge circuit, and the second terminal of the soft-start transistor is connected to the second power output terminal.

9. The power conversion circuit according to claim 8, characterized in that, The soft-start circuit further includes a first soft-start resistor and a second soft-start resistor. The first soft-start resistor is connected to the first power output terminal and the third controllable terminal, and the second soft-start resistor is connected to the first terminal and the third controllable terminal of the soft-start transistor.

10. A charger, characterized in that, Includes the power conversion circuit as described in any one of claims 1-9.

11. An electronic device, characterized in that, Includes the charger as described in claim 10.

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