Power converter with conversion rate control mechanism

Abstract

This invention discloses a power converter with a conversion rate control mechanism. The first terminal of the upper bridge switch is coupled to the input voltage. The first terminal of the lower bridge switch is connected to the second terminal of the upper bridge switch. The second terminal of a first capacitor is connected to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch. The first terminal of an inductor is connected to the second terminal of the first capacitor and to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch. The first terminal of a second capacitor is connected to the second terminal of the inductor. The second terminal of the second capacitor is grounded. The input terminal of a current control device is connected to the power output terminal of the upper bridge buffer. The output terminal of the current control device is connected to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch.

Description

Technical Field

[0001] This invention relates to a power converter, and more particularly to a power converter with a conversion rate control mechanism. Background Technology

[0002] For electronic devices, voltage converters are indispensable components, used to regulate voltage and supply the regulated voltage to the device. Different voltage converters are developed based on different power requirements. It should be understood that high switching frequencies of the upper and lower bridge switches in a power supply will generate high noise. In specific applications, such as electronic devices using power converters, like mobile phones, the high noise of the power converter can affect signal transmission. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a power converter with a conversion rate control mechanism, addressing the shortcomings of existing technologies. The converter includes an upper bridge switch, a lower bridge switch, a first capacitor, an inductor, a second capacitor, an upper bridge buffer, and a current control device. The first terminal of the upper bridge switch is coupled to the input voltage. The first terminal of the lower bridge switch is connected to the second terminal of the upper bridge switch. The second terminal of the lower bridge switch is grounded. The first capacitor has a first terminal and a second terminal. The second terminal of the first capacitor is connected to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch. The first terminal of the inductor is connected to the second terminal of the first capacitor and to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch. The first terminal of the second capacitor is connected to the second terminal of the inductor. The second terminal of the second capacitor is grounded. The signal input terminal of the upper bridge buffer is connected to the output terminal of the drive circuit. The signal output terminal of the upper bridge buffer is connected to the control terminal of the upper bridge switch. The power input terminal of the upper bridge buffer is connected to the first terminal of the first capacitor and a shared voltage. The input terminal of the current control device is connected to the power output terminal of the upper bridge buffer. The output terminal of the current control device is connected to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch.

[0004] In one embodiment, the power converter with a conversion rate control mechanism further includes a resistor. A first terminal of the resistor is connected to the power input of the upper bridge buffer and coupled to a shared voltage. A second terminal of the resistor is connected to a first terminal of a first capacitor.

[0005] In one embodiment, the power converter with a conversion rate control mechanism further includes a diode. The anode of the diode is connected to a shared voltage. The cathode of the diode is connected to the power input terminal of the upper bridge buffer.

[0006] In one embodiment, the power converter with a slew rate control mechanism further includes a lower-bridge buffer. The signal input terminal of the lower-bridge buffer is connected to the output terminal of the drive circuit. The signal output terminal of the lower-bridge buffer is connected to the control terminal of the lower-bridge switch.

[0007] In one embodiment, the current control device includes a resistor. A first terminal of the resistor serves as the input terminal of the current control device. A second terminal of the resistor serves as the output terminal of the current control device.

[0008] In one embodiment, the current control device includes multiple resistors connected in series. One end of one resistor serves as the input terminal of the current control device, and one end of another resistor serves as the output terminal.

[0009] In one embodiment, the current control device includes a plurality of resistors. The plurality of resistors are connected in parallel with each other. The first terminal of each resistor serves as the input terminal of the current control device. The second terminal of each resistor serves as the output terminal of the current control device.

[0010] In one embodiment, the current control device includes a plurality of resistors and a plurality of switching components. The first terminal of each resistor serves as the input terminal of the current control device. The second terminals of the plurality of resistors are respectively connected to the first terminals of the plurality of switching components. The second terminal of each switching component serves as the output terminal of the current control device.

[0011] In one embodiment, the current control device includes multiple resistors and multiple switching components. The first terminal of each switching component serves as the input terminal of the current control device. The second terminals of the multiple switching components are respectively connected to the first terminals of the multiple resistors. The second terminals of each resistor serve as the output terminal of the current control device.

[0012] In one embodiment, the current control device further includes a resistor controller. The resistor controller is connected to the control terminals of each switching component and configured to control the operation of the multiple switching components.

[0013] In one embodiment, the current control device includes an error amplifier, a transistor, and a resistor. A first terminal of the transistor serves as the input terminal of the current control device. A second terminal of the transistor is connected to a first terminal of the resistor. A second terminal of the resistor serves as the output terminal of the current control device. A first input terminal of the error amplifier is coupled to a reference voltage. A second input terminal of the error amplifier is connected to the node between the second terminal of the transistor and the first terminal of the resistor. The output terminal of the error amplifier is connected to the control terminal of the transistor.

[0014] Furthermore, this invention provides a power converter with a conversion rate control mechanism, comprising an upper bridge switch, a lower bridge switch, an inductor, a capacitor, an upper bridge buffer, and a first current control device. The first terminal of the upper bridge switch is coupled to the input voltage. The first terminal of the lower bridge switch is connected to the second terminal of the upper bridge switch, and the second terminal of the lower bridge switch is grounded. The first terminal of the inductor is connected to the node between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch. The first terminal of the capacitor is connected to the second terminal of the inductor. The second terminal of the capacitor is grounded. The signal input terminal of the upper bridge buffer is connected to the output terminal of the drive circuit, and the signal output terminal of the upper bridge buffer is connected to the control terminal of the upper bridge switch. The power output terminal of the upper bridge buffer is grounded. The output terminal of the first current control device is connected to the power input terminal of the upper bridge buffer. The input terminal of the first current control device is connected to a shared voltage.

[0015] In one embodiment, the power converter with a slew rate control mechanism further includes a lower bridge buffer. The signal input terminal of the lower bridge buffer is connected to the output terminal of the drive circuit, and the signal output terminal of the lower bridge buffer is connected to the control terminal of the lower bridge switch.

[0016] In one embodiment, the first current control device includes a resistor. A first terminal of the resistor serves as the input terminal of the first current control device. A second terminal of the resistor serves as the output terminal of the first current control device.

[0017] In one embodiment, the first current control device includes a plurality of resistors connected in series. One end of one resistor serves as the input terminal of the first current control device, and one end of another resistor serves as the output terminal of the first current control device.

[0018] In one embodiment, the first current control device includes a plurality of resistors. The plurality of resistors are connected in parallel with each other. The first terminal of each resistor serves as the input terminal of the first current control device. The second terminal of each resistor serves as the output terminal of the first current control device.

[0019] In one embodiment, the first current control device includes a plurality of resistors and a plurality of switching components. The first terminal of each resistor serves as the input terminal of the first current control device. The second terminals of the plurality of resistors are respectively connected to the first terminals of the plurality of switching components. The second terminal of each switching component serves as the output terminal of the first current control device.

[0020] In one embodiment, the first current control device further includes a resistor controller. The resistor controller is connected to the control terminals of each switching component and configured to control the operation of the multiple switching components.

[0021] In one embodiment, the first current control device includes an error amplifier, a transistor, and a resistor. A first terminal of the transistor serves as the input terminal of the first current control device. A second terminal of the transistor is connected to a first terminal of the resistor. The second terminal of the resistor serves as the output terminal of the first current control device. A first input terminal of the error amplifier is coupled to a reference voltage. A second input terminal of the error amplifier is connected to a node between the second terminal of the transistor and the first terminal of the resistor. The output terminal of the error amplifier is connected to the control terminal of the transistor.

[0022] In one embodiment, the power converter with a conversion rate control mechanism further includes a second current control device. The second current control device is disposed between the upper bridge buffer and ground. The input terminal of the second current control device is connected to the power output terminal of the upper bridge buffer, and the output terminal of the second current control device is grounded.

[0023] As described above, the present invention provides a power converter with a slew rate control mechanism, which includes a current control device that can provide different resistance values ​​according to actual needs. By providing different resistance values, the voltage slew rate of the falling edge of each waveform of the voltage signal between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch can be adjusted, or the voltage slew rate of the control terminal of the upper bridge switch can be adjusted, so that the noise of the power converter is reduced to the desired noise value and operates with the desired efficiency.

[0024] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0025] Figure 1 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the first embodiment of the present invention.

[0026] Figure 2 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to a second embodiment of the present invention.

[0027] Figure 3 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the third embodiment of the present invention.

[0028] Figure 4 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the fourth embodiment of the present invention.

[0029] Figure 5 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the fifth embodiment of the present invention.

[0030] Figure 6 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the sixth embodiment of the present invention.

[0031] Figure 7 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the seventh embodiment of the present invention.

[0032] Figure 8 The waveform diagrams are of the voltage signals between the upper bridge switch and the lower bridge switch of the current control device of the power converter with conversion rate control mechanism in the first to seventh embodiments of the present invention.

[0033] Figure 9 The graphs show the efficiency of the output current of the power converter with conversion rate control mechanism according to the first to seventh embodiments of the present invention.

[0034] Figure 10 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the eighth embodiment of the present invention.

[0035] Figure 11 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the ninth embodiment of the present invention. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention. In addition, the term "or" as used herein may, depending on the actual situation, include any combination of any one or more of the associated listed items.

[0037] [First Embodiment]

[0038] Please see Figure 1 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the first embodiment of the present invention.

[0039] The power converter in this embodiment may include an upper bridge switch UG, a lower bridge switch LG, a first capacitor C1, an inductor L, a second capacitor C2, a current control device CCD, an upper bridge buffer BF1, and a lower bridge buffer BF2. In this embodiment, the upper bridge switch UG may be an n-channel metal-oxide-semiconductor field-effect transistor (NMOS).

[0040] The first terminal of the upper bridge switch UG can be coupled to the input voltage VIN. The second terminal of the upper bridge switch UG can be connected to the first terminal of the lower bridge switch LG. The second terminal of the lower bridge switch LG can be grounded. The node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG can be connected to the first terminal of the inductor L. The second terminal of the inductor L is connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is grounded.

[0041] The control terminals of the upper bridge switch UG and the lower bridge switch LG can be connected to a drive circuit (not shown) to receive the upper bridge drive signal PWM and the lower bridge drive signal PWMb from this drive circuit, respectively. In this embodiment, the upper bridge drive signal PWM and the lower bridge drive signal PWMb can be pulse width modulation signals, but the present invention is not limited thereto.

[0042] The first terminal of the first capacitor C1 can be coupled to the shared voltage VCC. The second terminal of the first capacitor C1 can be connected to the node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG, and can also be connected to the first terminal of the inductor L.

[0043] The input terminal IN of the current control device CCD can be connected to the power output terminal of the upper bridge buffer BF1. The output terminal OUT of the current control device CCD can be connected to node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG, and can also be connected to the second terminal of the first capacitor C1.

[0044] One signal input terminal of the lower bridge buffer BF2 can be connected to the output terminal of the drive circuit (not shown) to receive the lower bridge drive signal PWMb from the drive circuit. One signal output terminal of the lower bridge buffer BF2 can be connected to the control terminal of the lower bridge switch LG. The lower bridge buffer BF2 can be configured to buffer the lower bridge drive signal PWMb output from the drive circuit to the lower bridge switch LG.

[0045] One signal input terminal of the upper bridge buffer BF1 can be connected to the output terminal of the drive circuit (not shown) to receive the upper bridge drive signal PWM from the drive circuit. One signal output terminal of the upper bridge buffer BF1 can be connected to the control terminal of the upper bridge switch UG. One power input terminal of the upper bridge buffer BF1 can be directly connected to the first terminal of the first capacitor C1. One power output terminal of the upper bridge buffer BF1 can be connected to the input terminal IN of the current control device CCD. The upper bridge buffer BF1 can be configured to buffer the upper bridge drive signal PWM output from the drive circuit to the lower bridge switch LG.

[0046] If necessary, the power converter in this embodiment may also include a resistor Rc. The first end of the resistor Rc may be coupled to the shared voltage VCC. If a resistor Rc is provided, the power input terminal of the upper bridge buffer BF1 may be connected to the first end of the resistor Rc, and the second end of the resistor Rc may be connected to the first end of the first capacitor C1.

[0047] The power converter in this embodiment may further include a diode DE to prevent the discharge current of the first capacitor C1 from recharging the shared voltage VCC. The anode of the diode DE is connected to the shared voltage VCC. The cathode of the diode DE may be connected (through a resistor Rc) to the first terminal of the first capacitor C1.

[0048] [Second Embodiment]

[0049] Please see Figure 2 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the second embodiment of the present invention.

[0050] In this embodiment, the current control device of the power converter (e.g. Figure 1 The current control device shown is CCD. Figure 10 and Figure 11 The first current control device (CCD1) or the second current control device (CCD2) shown may include, for example: Figure 2 The resistor R0 is shown. The first terminal of resistor R0 can be used as the input terminal IN of the current control device. That is, as shown... Figure 2 The first terminal of the resistor R0 shown can be connected as follows: Figure 1 The power output terminal of the upper bridge buffer BF1 shown, or connected as follows Figure 10 or Figure 11 The shared voltage VCC is shown.

[0051] The second terminal of resistor R0 can be used as the output terminal OUT of the current control device. That is, as... Figure 2 The second terminal of the resistor R0 shown can be connected as follows: Figure 1 The node LX shown, or the connection as... Figure 10 or Figure 11 The power input terminal of the upper bridge buffer BF1 is shown.

[0052] The second end of resistor R0 can be connected to node LX between the second end of upper bridge switch UG and the first end of lower bridge switch LG, and can also be connected to the second end of first capacitor C1.

[0053] The first capacitor C1 can discharge, and the discharge current Ic of the first capacitor C1 can flow into the input terminal IN of the current control device CCD. The current control device CCD can be configured to reduce the discharge current Ic, and the reduced discharge current Ic can flow towards node LX.

[0054] [Third Embodiment]

[0055] Please see Figure 3 The circuit layout diagram of the current control device of the power converter with conversion rate control mechanism according to the third embodiment of the present invention.

[0056] In this embodiment, the current control device of the power converter (e.g. Figure 1 The current control device shown is CCD. Figure 10 and Figure 11 The first current control device (CCD1) or the second current control device (CCD2) shown may include, for example: Figure 3 The diagram shows multiple resistors Rs1 to Rsn, where n represents the number of resistors included in the current control device and can be any suitable integer value. It should be understood that the present invention is not limited to the number and resistance values ​​of the resistors included in the current control device.

[0057] Multiple resistors Rs1 to Rsn can be connected in series. The first terminal of resistor Rs1 can be used as the input terminal IN of the current control device. That is, as... Figure 3 The first terminal of the resistor Rs1 shown can be connected as follows: Figure 1 The power output terminal of the upper bridge buffer BF1 shown, or connected as follows Figure 10 or Figure 11 The shared voltage VCC is shown.

[0058] The second end of resistor Rs1 can be connected to the first end of resistor Rs2, the second end of resistor Rs2 can be connected to the first end of resistor Rs3, and the second end of resistor Rs3 can be connected to the first end of resistor Rs4. Multiple other resistors Rs3 to Rsn are arranged sequentially and connected in series.

[0059] The second terminal of resistor Rsn can be used as the output terminal OUT of the current control device. That is, the second terminal of resistor Rsn can be connected to, for example... Figure 1 The node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG, as shown, or the connection as... Figure 10 or Figure 11 The power input terminal of the upper bridge buffer BF1 is shown.

[0060] [Fourth Embodiment]

[0061] Please see Figure 4 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the fourth embodiment of the present invention.

[0062] In this embodiment, the current control device of the power converter (e.g. Figure 1 The current control device shown is CCD. Figure 10 and Figure 11The first current control device (CCD1) or the second current control device (CCD2) shown may include, for example: Figure 4 The diagram shows multiple resistors R1 to Rn. These resistors R1 to Rn can be connected in parallel with each other.

[0063] The first terminal of each resistor R1 to Rn can be used as the input terminal IN of the current control device. For example... Figure 4 The first terminals of the resistors R1 to Rn shown can be connected as follows: Figure 1 The power output terminal of the upper bridge buffer BF1 shown, or connected as follows Figure 10 or Figure 11 The shared voltage VCC is shown.

[0064] The second terminals of each resistor R1 to Rn can be used as the output terminal OUT of the current control device. That is, as... Figure 4 The second terminals of the resistors R1 to Rn shown can be connected as follows: Figure 1 The node LX between the second end of the upper bridge switch UG and the first end of the lower bridge switch LG is shown, and can be connected to the second end of the first capacitor C1.

[0065] [Fifth Embodiment]

[0066] Please see Figure 5 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the fifth embodiment of the present invention.

[0067] In this embodiment, the current control device of the power converter (e.g. Figure 1 The current control device shown is CCD. Figure 10 and Figure 11 The first current control device (CCD1) or the second current control device (CCD2) shown may include multiple resistors R1 to Rn and multiple switching components S1 to Sn.

[0068] like Figure 5 The first terminals of the resistors R1 to Rn shown can be connected as follows: Figure 1 The power output terminal of the upper bridge buffer BF1 is shown.

[0069] The second terminals of multiple resistors R1 to Rn can be connected to the first terminals of multiple switching components S1 to Sn, respectively. The second terminals of each switching component S1 to Sn can serve as the output terminal OUT of a current control device. That is, as shown... Figure 5 The second terminals of each switch assembly S1 to Sn shown can be connected as follows: Figure 1 The node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG, as shown, or the connection as... Figure 10 or Figure 11 The power input terminal of the upper bridge buffer BF1 is shown.

[0070] Furthermore, such as Figure 1 The current control device shown may further include a resistor controller RCT. The resistor controller RCT can be connected to the control terminals of each switching component S1 to Sn, and can be used to output multiple (e.g., n) switching control signals to multiple switching components S1 to Sn respectively, so as to control the operation of multiple switching components S1 to Sn respectively.

[0071] The resistor controller (RCT) can activate any one or more of the multiple switching components S1 to Sn according to actual application requirements, so that the current control device provides different resistance values ​​to achieve the desired effect. Figure 1 The discharge current Ic of the first capacitor C1 shown is reduced to different current values.

[0072] [Sixth Embodiment]

[0073] Please see Figure 6 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the sixth embodiment of the present invention.

[0074] In this embodiment, the current control device of the power converter (e.g. Figure 1 The current control device shown is CCD. Figure 10 and Figure 11 The first current control device (CCD1) or the second current control device (CCD2) shown may include an error amplifier EAR, a transistor T1, and a resistor Re. For example, the transistor T1 may be a field-effect transistor, but the invention is not limited thereto.

[0075] The first terminal of transistor T1 can be used as the input terminal IN of a current control device. For example... Figure 6 The first terminal of the transistor T1 shown can be connected as follows: Figure 1 The power output terminal of the upper bridge buffer BF1 shown, or connected as follows Figure 10 or Figure 11 The shared voltage VCC is shown.

[0076] The first input terminal of the error amplifier EAR, such as the non-inverting input terminal, can be coupled to a reference voltage. The second input terminal of the error amplifier EAR, such as the inverting input terminal, can be connected to the node between the second terminal of transistor T1 and the first terminal of resistor Re. The output terminal of the error amplifier EAR can be connected to the control terminal of transistor T1. In this embodiment, this reference voltage is a variable voltage, but it can actually be replaced by a fixed voltage.

[0077] The second terminal of transistor T1 can be connected to the first terminal of resistor Re. The second terminal of resistor Re can serve as the output terminal OUT of the current control device. That is, the second terminal of resistor Re can be connected to, for example... Figure 1 The node LX between the second terminal of the upper bridge switch UG and the first terminal of the lower bridge switch LG, as shown, or the connection as... Figure 10 or Figure 11 The power input terminal of the upper bridge buffer BF1 is shown.

[0078] [Seventh Embodiment]

[0079] Please see Figure 7 This is a circuit layout diagram of the current control device of a power converter with a conversion rate control mechanism according to the seventh embodiment of the present invention.

[0080] The same content as the sixth embodiment is not repeated here. The only difference between the seventh and sixth embodiments is that the power converter current control device (e.g., ...) in the seventh embodiment... Figure 1 The current control device shown is CCD. Figure 10 and Figure 11 The transistor T2 included in the first current control device CCD1 or the second current control device CCD2 shown is a bipolar transistor, but the present invention is not limited thereto.

[0081] Please see Figure 8 and Figure 9 ,in Figure 8 These are waveform diagrams of the voltage signals at the nodes between the upper and lower bridge switches of the current control device of the power converter with a conversion rate control mechanism in the first to seventh embodiments of the present invention. Figure 9 The graphs show the efficiency of the output current of the power converter with conversion rate control mechanism according to the first to seventh embodiments of the present invention.

[0082] like Figures 2 to 7 The resistance value provided by the current control device shown can be adjusted according to actual application requirements, such as 24Ω or 51Ω, but the present invention is not limited thereto. In contrast, existing power converters do not have a current control device and do not provide any resistor.

[0083] like Figure 8 As shown, the existing power converter does not provide a resistance value (i.e., the resistance is 0Ω). As a result, the voltage signal at the node between the upper and lower bridge switches of the power converter drops rapidly.

[0084] The current control device (CCD) of the power converter can provide different resistance values, such as 24Ω or 51Ω. The larger the resistance value provided by the current control device (CCD), the better. Figure 1 The slower the voltage signal drops at node LX between the upper bridge switch UG and the lower bridge switch LG, the lower the noise of the power converter.

[0085] However, as Figure 9As shown, the resistance value provided by the current control device of the power converter affects the operating efficiency of the power converter. Therefore, the resistance value provided by the current control device of the power converter should be determined according to the actual requirements.

[0086] For example, when an electronic device is transmitting signals wirelessly, the current control device can provide a larger resistance value to reduce noise caused by the power converter. When the electronic device is in standby mode or performing other operations that do not require signal transmission, the current control device reduces the provided resistance value to improve the operating efficiency of the power converter and extend standby time.

[0087] [Eighth Embodiment]

[0088] Please see Figure 10 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the eighth embodiment of the present invention.

[0089] The power converter with conversion rate control mechanism in this embodiment may include an upper bridge switch UG2, a lower bridge switch LG, an inductor L, a capacitor C, an upper bridge buffer BF1, a lower bridge buffer BF2, and a first current control device CCD1. The similarities to the previous embodiments will not be repeated here. In this embodiment, the upper bridge switch UG2 may be a p-channel metal-oxide-semiconductor field-effect transistor (PMOS).

[0090] The first terminal of the upper bridge switch UG2 can be coupled to the input voltage. The first terminal of the lower bridge switch LG is connected to the second terminal of the upper bridge switch UG2. The second terminal of the lower bridge switch LG is grounded. The first terminal of the inductor L can be connected to the node LX between the second terminal of the upper bridge switch UG2 and the first terminal of the lower bridge switch LG. The first terminal of the capacitor C can be connected to the second terminal of the inductor L. The second terminal of the capacitor C is grounded.

[0091] The signal input terminal of the upper bridge buffer BF1 can be connected to the output terminal of the drive circuit, and the signal output terminal of the upper bridge buffer BF1 can be connected to the control terminal of the upper bridge switch UG2. The power output terminal of the upper bridge buffer BF1 is grounded. The output terminal OUT of the first current control device CCD1 can be connected to the power input terminal of the upper bridge buffer BF1. The input terminal IN of the first current control device CCD1 can be connected to the shared voltage VCC.

[0092] The input terminal IN of the first current control device CCD1 can receive a shared voltage VCC, and can slowly supply a common current to the power input terminal of the upper bridge buffer BF1 based on the shared voltage VCC, so that the voltage at the power input terminal of the upper bridge buffer BF1 rises slowly. As a result, the upper bridge switch UG2 switches from the on state to the off state slowly, thus reducing the noise of the power converter.

[0093] [Ninth Embodiment]

[0094] Please see Figure 11 This is a circuit layout diagram of a power converter with a conversion rate control mechanism according to the ninth embodiment of the present invention. The similarities to the previous embodiments are not repeated here.

[0095] Compared to the eighth embodiment, the ninth embodiment further includes a second current control device CCD2. The second current control device CCD2 can be disposed between the upper bridge buffer BF1 and ground. The input terminal IN of the second current control device CCD2 can be connected to the power output terminal of the upper bridge buffer BF1. The output terminal OUT of the second current control device CCD2 can be grounded.

[0096] The second current control device CCD2 can ground the power output terminal of the upper bridge buffer BF1 to pull the control terminal of the upper bridge buffer BF1 to zero, thereby switching the upper bridge switch UG2 from the closed state to the open state. After the upper bridge buffer BF1 has been turned on for a period of time, the first current control device CCD1 can switch the upper bridge buffer BF1 from the open state back to the closed state as described above.

[0097] In summary, this invention provides a power converter with a slew rate control mechanism, which includes a current control device that can provide different resistance values ​​according to actual needs. By providing different resistance values, the voltage slew rate of the falling edge of each waveform of the voltage signal between the second terminal of the upper bridge switch and the first terminal of the lower bridge switch can be adjusted, or the voltage slew rate of the control terminal of the upper bridge switch can be adjusted, so that the noise of the power converter is reduced to the desired noise value and operates with the desired efficiency.

[0098] The above-disclosed content is only a preferred and feasible embodiment of the present invention and is not intended to limit the claims of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. A power converter having a conversion ratio control mechanism, characterized by, The power converter with the conversion rate control mechanism comprises: an upper bridge switch, a first end of the upper bridge switch being coupled to an input voltage; a lower bridge switch, a first end of the lower bridge switch being connected to a second end of the upper bridge switch, and a second end of the lower bridge switch being grounded; a first capacitor, having a first end and a second end, the second end of the first capacitor being connected to a node between the second end of the upper bridge switch and the first end of the lower bridge switch; an inductor, a first end of the inductor being connected to the second end of the first capacitor, and being connected to the node between the second end of the upper bridge switch and the first end of the lower bridge switch; a second capacitor, a first end of the second capacitor being connected to a second end of the inductor, and a second end of the second capacitor being grounded; an upper bridge buffer, a signal input end of the upper bridge buffer being connected to an output end of a driving circuit, a signal output end of the upper bridge buffer being connected to a control end of the upper bridge switch, and a power input end of the upper bridge buffer being connected to the first end of the first capacitor and a shared voltage; and a current control device, an input end of the current control device being connected to a power output end of the upper bridge buffer, and an output end of the current control device being connected to the node between the second end of the upper bridge switch and the first end of the lower bridge switch.

2. The power converter with conversion ratio control mechanism according to claim 1, wherein, The power converter with the conversion rate control mechanism further comprises a resistor, a first end of the resistor being connected to the power input end of the upper bridge buffer and being coupled to the shared voltage, and a second end of the resistor being connected to the first end of the first capacitor.

3. The power converter with conversion ratio control mechanism according to claim 1, wherein, The power converter with the conversion rate control mechanism further comprises a diode, an anode of the diode being connected to the shared voltage, and a cathode of the diode being connected to the power input end of the upper bridge buffer.

4. The power converter with conversion ratio control mechanism according to claim 1, wherein, The power converter with the conversion rate control mechanism further comprises a lower bridge buffer, a signal input end of the lower bridge buffer being connected to the output end of the driving circuit, and a signal output end of the lower bridge buffer being connected to a control end of the lower bridge switch.

5. The power converter with conversion ratio control mechanism according to claim 1, wherein, The current control device comprises a resistor, a first end of the resistor being the input end of the current control device, and a second end of the resistor being the output end of the current control device.

6. The power converter with conversion ratio control mechanism according to claim 1, wherein, The current control device comprises a plurality of resistors, the plurality of resistors being connected in series to each other, one end of one of the resistors being the input end of the current control device, and one end of another of the resistors being the output end of the current control device.

7. The power converter with conversion ratio control mechanism according to claim 1, wherein, The current control device comprises a plurality of resistors, the plurality of resistors being connected in parallel to each other, a first end of each of the resistors being the input end of the current control device, and a second end of each of the resistors being the output end of the current control device.

8. The power converter with conversion ratio control mechanism according to claim 1, wherein, The current control device comprises a plurality of resistors and a plurality of switch components, a first end of each of the resistors being the input end of the current control device, second ends of the plurality of resistors being connected to first ends of the plurality of switch components respectively, and a second end of each of the switch components being the output end of the current control device.

9. The power converter with conversion ratio control mechanism according to claim 8, wherein, The current control device further comprises a resistor controller, connected to control ends of the plurality of switch components, configured to control operations of the plurality of switch components.

10. The power converter with conversion ratio control mechanism according to claim 1, wherein, The current control device comprises an error amplifier, a transistor and a resistor, a first end of the transistor is an input end of the current control device, a second end of the transistor is connected to a first end of the resistor, a second end of the resistor is an output end of the current control device, a first input end of the error amplifier is coupled to a reference voltage, a second input end of the error amplifier is connected to a node between the second end of the transistor and the first end of the resistor, and an output end of the error amplifier is connected to a control end of the transistor.

11. A power converter having a conversion ratio control mechanism, characterized by, The power converter with the conversion rate control mechanism comprises: an upper bridge switch, a first end of the upper bridge switch being coupled to an input voltage; a lower bridge switch, a first end of the lower bridge switch being connected to a second end of the upper bridge switch, and a second end of the lower bridge switch being grounded; an inductor, a first end of the inductor being connected to a node between the second end of the upper bridge switch and the first end of the lower bridge switch; a capacitor, a first end of the capacitor being connected to a second end of the inductor, and a second end of the capacitor being grounded; an upper bridge buffer, a signal input end of the upper bridge buffer being connected to an output end of a driving circuit, a signal output end of the upper bridge buffer being connected to a control end of the upper bridge switch, and a power supply output end of the upper bridge buffer being grounded; and a first current control device, an output end of the first current control device being connected to a power supply input end of the upper bridge buffer, and an input end of the first current control device being connected to a shared voltage. The power converter with the conversion rate control mechanism further comprises a lower bridge buffer, a signal input end of the lower bridge buffer being connected to the output end of the driving circuit, and a signal output end of the lower bridge buffer being connected to a control end of the lower bridge switch.

12. The power converter with conversion ratio control mechanism of claim 11, wherein, The first current control device comprises a resistor, a first end of the resistor being an input end of the first current control device, and a second end of the resistor being an output end of the first current control device.

13. The power converter with conversion ratio control mechanism of claim 11, wherein, The first current control device comprises a plurality of resistors, the plurality of resistors being connected in series to each other, one end of one of the resistors being an input end of the first current control device, and one end of another of the resistors being an output end of the first current control device.

14. The power converter with conversion ratio control mechanism of claim 11, wherein, The first current control device comprises a plurality of resistors, the plurality of resistors being connected in parallel to each other, a first end of each of the resistors being an input end of the first current control device, and a second end of each of the resistors being an output end of the first current control device.

15. The power converter with conversion ratio control mechanism according to claim 11, wherein, The first current control device comprises a plurality of resistors and a plurality of switch components, a first end of each of the switch components being an input end of the first current control device, second ends of the plurality of resistors being respectively connected to first ends of the plurality of switch components, and a second end of each of the switch components being an output end of the first current control device.

16. The power converter with conversion ratio control mechanism of claim 11, wherein, The first current control device comprises a plurality of resistors and a plurality of switch components, a first end of each of the switch components being an input end of the first current control device, second ends of the plurality of switch components being respectively connected to first ends of the plurality of resistors, and a second end of each of the resistors being an output end of the first current control device.

17. The power converter with conversion ratio control mechanism according to claim 11, wherein, ​ 18. The power converter with conversion ratio control mechanism of claim 17, wherein, The first current control device further comprises a resistance controller connected to control terminals of the switch components, configured to control operation of the switch components.

19. The power converter with conversion ratio control mechanism according to claim 11, wherein, The first current control device comprises an error amplifier, a transistor and a resistance, a first terminal of the transistor serving as an input terminal of the first current control device, a second terminal of the transistor being connected to a first terminal of the resistance, a second terminal of the resistance serving as an output terminal of the first current control device, a first input terminal of the error amplifier being coupled to a reference voltage, a second input terminal of the error amplifier being connected to a node between the second terminal of the transistor and the first terminal of the resistance, and an output terminal of the error amplifier being connected to a control terminal of the transistor.

20. The power converter with conversion ratio control mechanism according to claim 11, wherein, The power converter with the conversion rate control mechanism further comprises a second current control device, the second current control device being arranged between the upper bridge buffer and the ground, an input terminal of the second current control device being connected to the power output terminal of the upper bridge buffer, and an output terminal of the second current control device being grounded.

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