Electronic device with H5 bridge type conversion function

Abstract

An electronic device includes a first resonant tank, a second resonant tank, a transformer pair, a rectifier circuit, and a bridge conversion circuit. The bridge conversion circuit includes a first node, a second node, and a third node. The first node is electrically connected to the first resonant tank, the second node is electrically connected to the second resonant tank, and the third node is electrically connected to the transformer pair. The bridge type conversion circuit correspondingly outputs a primary side square wave signal to at least one of the first resonance tank and the second resonance tank according to a control signal group. The transformer pair converts the primary side square wave signal into a secondary side square wave signal. The rectification circuit converts the secondary side square wave signal into a load DC voltage. The bridge-type conversion circuit correspondingly changes the magnitude of the load DC voltage according to the control signal group.

Description

Technical Field

[0001] This invention relates to electronic devices, and more particularly to electronic devices with H5 bridge conversion function. Background Technology

[0002] Traditional LLC topologies require a smaller magnetizing inductor and a wider frequency modulation range to achieve a wide output voltage range. A smaller magnetizing inductor results in a larger magnetizing current, leading to increased copper losses. A wider frequency modulation range may make it difficult for switching elements to achieve zero-voltage switching. These conditions reduce the converter's efficiency, and it is difficult to achieve the required voltage range using only traditional LLC resonant converter topologies.

[0003] While asymmetrical half-bridge (AHB) converters are suitable for a wide output voltage range, the DC component of the transformer magnetizing current makes them prone to core saturation at high output power, hindering high-power conversion. Some improved AHB converters are suitable for high-power operation, but still struggle to achieve an ultra-wide output voltage range.

[0004] Resonant converters are used for wide-range operation. Some studies have incorporated both voltage multiplication and rectification functions on the secondary side, switching between them via a switch to increase the output voltage range. However, this architecture can only provide twice the voltage range. Summary of the Invention

[0005] According to an embodiment of the present invention, the electronic device includes a first resonant tank, a second resonant tank, a transformer pair, a rectifier circuit, and a bridge converter circuit. The transformer pair is electrically connected to the first and second resonant tanks. The rectifier circuit is electrically connected to the transformer pair. The bridge converter circuit includes a first node, a second node, and a third node. The first node is electrically connected to the first resonant tank, the second node is electrically connected to the second resonant tank, and the third node is electrically connected to the transformer pair. The bridge converter circuit outputs a primary side-wave signal to at least one of the first and second resonant tanks according to a set of control signals. The transformer pair converts the primary side-wave signal into a secondary side-wave signal. The rectifier circuit converts the secondary side-wave signal into a load DC voltage. The bridge converter circuit changes the magnitude of the load DC voltage according to the set of control signals.

[0006] As described above, the electronic device includes a first transformer and a second transformer. The first transformer is electrically connected to a first resonant slot. The second transformer is electrically connected to a second resonant slot. The primary sides of both the first and second transformers are electrically connected to a third node. The turns ratio of the second transformer is different from that of the first transformer.

[0007] As described above in the electronic device, the first resonant slot includes a first inductor and a first capacitor. The first inductor is electrically connected to a first transformer. The first capacitor is electrically connected in series between the first inductor and a first node. The first inductor and the first capacitor change the voltage magnitude of the primary side wave signal according to the input frequency of the signal in the control signal group.

[0008] As described in the electronic device above, the second resonant slot includes a second inductor and a second capacitor. The second inductor is electrically connected to the first transformer. The second capacitor is electrically connected in series between the second inductor and the second node. The second inductor and the second capacitor change the voltage magnitude of the primary side wave signal according to the input frequency of the signal in the control signal group.

[0009] As described above, the bridge converter circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor. The first transistor is electrically connected between the positive terminal of the input power supply and a first node. The second transistor is electrically connected between the positive terminal of the input power supply and a third node. The third transistor is electrically connected between the second node and the negative terminal of the input power supply. The fourth transistor is electrically connected between the third node and the negative terminal of the input power supply. The fifth transistor is electrically connected between the first node and the second node. A control signal group is used to control the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor, respectively.

[0010] As described above, the bridge switching circuit operates in one of the following modes: mode 1, mode 2, mode 3, mode 4, mode 5, or mode 6, depending on the control signal group.

[0011] In the electronic device described above, when the bridge switching circuit operates in the first mode, the control signal group keeps the third and fourth transistors on, and the second transistor off. The first and fifth transistors receive the first modulation control signal and the second modulation control signal, respectively. The first modulation control signal is complementary to the second modulation control signal.

[0012] In the electronic device described above, when the bridge switching circuit operates in the second mode, the control signal group keeps the first and second transistors on, the fourth transistor off, and the third and fifth transistors receive the first modulation control signal and the second modulation control signal, respectively. The first modulation control signal is complementary to the second modulation control signal.

[0013] In the electronic device described above, when the bridge switching circuit operates in the third mode, the control signal group keeps the first and third transistors on, the fifth transistor off, and the second and fourth transistors receive the first modulation control signal and the second modulation control signal, respectively. The first modulation control signal is complementary to the second modulation control signal.

[0014] In the electronic device described above, when the bridge switching circuit operates in the fourth mode, the control signal group keeps the third transistor on, the first and fourth transistors receive the first modulation control signal, and the second and fifth transistors receive the second modulation control signal. The first modulation control signal is complementary to the second modulation control signal.

[0015] In the electronic device described above, when the bridge switching circuit operates in the fifth mode, the control signal group keeps the first transistor on, the fourth and fifth transistors receive the first modulation control signal, and the second and third transistors receive the second modulation control signal. The first modulation control signal is complementary to the second modulation control signal.

[0016] In the electronic device described above, when the bridge switching circuit operates in the sixth mode, the control signal group keeps the fifth transistor on, the first and fourth transistors receive the first modulation control signal, and the second and third transistors receive the second modulation control signal. The first modulation control signal is complementary to the second modulation control signal.

[0017] As described above, in the electronic device, the first resonant tank and the second resonant tank change the voltage magnitude of the primary side wave signal according to the input working cycle of the signal in the control signal group.

[0018] In the electronic device described above, the first modulation control signal and the second modulation control signal are frequency modulation control signals.

[0019] In the electronic device described above, when the frequencies of the first modulation control signal and the second modulation control signal are less than or equal to a preset frequency, the first modulation control signal and the second modulation control signal are frequency modulation control signals; when the frequencies of the first modulation control signal and the second modulation control signal are greater than the preset frequency, the first modulation control signal and the second modulation control signal are pulse width modulation control signals. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an electronic device 100 according to an embodiment of the present invention.

[0021] Figure 2A This is a schematic diagram of the electronic device 100 operating in a first mode according to an embodiment of the present invention.

[0022] Figure 2B This is a schematic diagram of the electronic device 100 operating in a second mode according to an embodiment of the present invention.

[0023] Figure 2C This is a schematic diagram of the electronic device 100 operating in a third mode according to an embodiment of the present invention.

[0024] Figure 2DThis is a schematic diagram of the electronic device 100 operating in a fourth mode according to an embodiment of the present invention.

[0025] Figure 2E This is a schematic diagram of the electronic device 100 operating in the fifth mode according to an embodiment of the present invention.

[0026] Figure 2F This is a schematic diagram of the electronic device 100 operating in the sixth mode according to an embodiment of the present invention.

[0027] Figure 3 This is a graph showing the relationship between gain and frequency of the electronic device 100 in different operating modes according to an embodiment of the present invention.

[0028] Figure 4 This is a flowchart of the parameter design method for the electronic device 100 according to an embodiment of the present invention.

[0029] Figure 5 This is a graph showing the relationship between efficiency and output voltage when the electronic device 100 of this embodiment operates in frequency modulation, asymmetric control, and surge mode.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100: Electronic devices

[0032] 102: Bridge converter circuit

[0033] 104: Transformer pair

[0034] 106: Rectifier Circuit

[0035] V in Input power

[0036] Q p1 First transistor

[0037] Q p2 Second transistor

[0038] Q p3 Third transistor

[0039] Q p4 Fourth transistor

[0040] Q p5 The fifth transistor

[0041] RT1: First resonant slot

[0042] RT2: Second resonant slot

[0043] T1, T2: Transformers

[0044] n1, n2: Turns ratio

[0045] a: First node

[0046] b: Second node

[0047] c: Third node

[0048] d, e: Nodes

[0049] C r,1 C r,2 C s :capacitance

[0050] L r,1 ,L r,2 ,L m,1 ,L m,2 :inductance

[0051] Q s1 Q s2 Q s3 Q s4 :transistor

[0052] I in i Lr1 i Lr2 i Lm,1 i Lm,2 i s ,I Load Current

[0053] R Load Load resistance

[0054] V Load Load DC voltage

[0055] 300, 302, 304, 306, 308, 310: Curves

[0056] Mode 1: First Mode

[0057] Mode 2: Second Mode

[0058] Mode 3: Third Mode

[0059] Mode 4: Fourth Mode

[0060] Mode 5: The Fifth Mode

[0061] Mode 6: The Sixth Mode

[0062] G max Maximum gain

[0063] G min Minimum gain

[0064] S400, S402, S404, S406, S408: Steps 500, 502, 504: Curve Detailed Implementation

[0065] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0066] Figure 1 This is a schematic diagram of an electronic device 100 according to an embodiment of the present invention. Figure 1 As shown, the electronic device 100 includes a first resonant tank RT1, a second resonant tank RT2, a transformer pair 104, a rectifier circuit 106, and a bridge converter circuit 102. In some embodiments, the first resonant tank RT1 and the second resonant tank RT2 are electrically connected between the bridge converter circuit 102 and the transformer pair 104. The rectifier circuit 106 is electrically connected to the transformer pair 104. The rectifier circuit 106 is electrically connected to the load resistor R. Load The bridge converter circuit 102 includes a first node a, a second node b, and a third node c. The first node a is electrically connected to the first resonant tank RT1, the second node b is electrically connected to the second resonant tank RT2, and the third node c is electrically connected to the transformer pair 104.

[0067] In some embodiments, the bridge converter circuit 102 outputs a primary side-wave signal to at least one of the first resonant slot RT1 and the second resonant slot RT2 according to a control signal set. The control signal set is used to control the plurality of switching elements included in the bridge converter circuit 102. The transformer pair 104 converts the primary side-wave signal into a secondary side-wave signal. The rectifier circuit 106 converts the secondary side-wave signal into a load DC voltage V. Load The bridge converter circuit 102 changes the load DC voltage V according to the control signal group. Load The size of the transformer. Specifically, transformer pair 102 includes transformer T1 and transformer T2. Transformer T1 is electrically connected to the first resonant slot RT1, and transformer T2 is electrically connected to the second resonant slot RT2. The primary sides of transformers T1 and T2 are electrically connected to a third node c. In some embodiments, the turns ratio of transformer T2 is different from that of transformer T1. For example, the turns ratio of transformer T2 is twice the turns ratio of transformer T1. For instance, if the turns ratio of the primary and secondary sides of transformer T1 is N:1, then the turns ratio of the primary and secondary sides of transformer T2 is 2N:1.

[0068] exist Figure 1 In one embodiment, the first resonant slot RT1 includes an inductor L r,1 and capacitor C r,1 Inductor L r,1Electrically connected transformer T1, capacitor C r,1 Electrically connected in series with inductor L r,1 Between and the first node a. Inductance L r,1 and capacitor C r,1 The voltage magnitude of the primary side wave signal is changed according to the input frequency of the signal in the control signal group. The second resonant tank RT2 includes an inductor L. r,2 and capacitor C r,2 Inductor L r,2 Electrically connected transformer T2, capacitor C r,2 Electrically connected in series with inductor L r,2 And between the second node b. Similarly, the inductance L r,2 and capacitor C r,2 The voltage magnitude of the primary side wave signal is changed according to the input frequency of the signal in the control signal group. In some embodiments, the first resonant tank RT1 and the second resonant tank RT2 change the voltage magnitude of the primary side wave signal according to the input duty cycle of the signal in the control signal group.

[0069] exist Figure 1 In one embodiment, the bridge switching circuit 102 includes a first transistor Q. p1 The second transistor Q p2 The third transistor Q p3 The fourth transistor Q p4 and the fifth transistor Q p5 The first transistor Q p1 Electrically connected to the input power supply V in Between the positive terminal and the first node a. The second transistor Q. p2 Electrically connected to the input power supply V in Between the positive terminal and the third node c. The third transistor Q. p3 Electrically connected to the second node b and the input power supply V in Between the negative terminals. The fourth transistor Q. p4 Electrically connected to the third node c and the input power supply V in Between the negative terminals. The fifth transistor Q. p5 Electrically connected between the first node a and the second node b. The control signal group is used to control the first transistor Q respectively. p1 The second transistor Q p2 The third transistor Q p3 The fourth transistor Q p4 and the fifth transistor Q p5For example, the control signal group includes a first control signal, a second control signal, a third control signal, a fourth control signal, and a fifth control signal. Each of the first, second, third, fourth, and fifth control signals may be, for example, a low-level voltage, a high-level voltage, a frequency-modulated control signal, or a pulse-width modulated control signal.

[0070] In detail, the bridge switching circuit 102 operates in the first mode, the second mode, the third mode, the fourth mode, the fifth mode, or the sixth mode according to the control signal group. Figure 2A This is a schematic diagram illustrating the operation of the electronic device 100 in a first mode according to an embodiment of the present invention. Figure 2A As shown, when the bridge switching circuit 102 operates in the first mode, the control signal group causes the third transistor Q to... p3 and the fourth transistor Q p4 The second transistor Q remains in the ON state. p2 The first transistor Q remains in the off state. p1 and the fifth transistor Q p5 The system receives a first modulation control signal and a second modulation control signal, respectively. The first modulation control signal is complementary to the second modulation control signal. For example, when the first modulation control signal is at a low voltage level in a square wave signal, the second modulation control signal is at a high voltage level in a square wave signal. When the bridge switching circuit 102 operates in the first mode, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage +V in A square wave signal composed of zero voltage. The voltage V between the third node c and the second node b at both ends of the second resonant slot RT2. cb Because the third transistor Q p3 and the fourth transistor Q p4 Conducting and short-circuiting to the input power supply V in The negative terminal, voltage V cb The voltage is zero. Therefore, the bridge switching circuit 102 operating in the first mode is equivalent to the first resonant slot RT1 operating in the half-bridge LLC operating mode. In some embodiments, the first modulation control signal and the second modulation control signal may be, for example, frequency modulation control signals, but the invention is not limited thereto.

[0071] When the first resonant slot RT1 operates in half-bridge LLC mode, the input power supply V in Provide current I in And according to the first transistor Q p1 and the fifth transistor Q p5 The alternating switching generates a flow from the first node a through the capacitor C in the first resonant slot RT1. r,1 and inductor L r,1 current iLr1 and the current flowing through inductor L m,1 current i Lm,1 The primary winding of transformer T1 induces a current i. Lm,1 This causes a corresponding current i to be generated in the secondary winding of transformer T1. s The rectifier circuit 106 includes transistor Q. s1 transistor Q s2 transistor Q s3 and transistor Q s4 Transistor Q s1 The secondary winding of transformer T1 is electrically connected via node d. Transistor Q s3 Electrical connection node d. Transistor Q. s2 Electrical connection between node e and transistor Q s1 Transistor Q s4 The secondary winding of transformer T2 is electrically connected through node e. Current i s After transistor Q s1 transistor Q s2 transistor Q s3 and transistor Q s4 The current I generated after rectification Load Current I Load Flow through load resistor R Load This generates a load DC voltage V Load The electronic device 100 also includes a capacitor C. s , connected in parallel to the load resistor R Load It has a voltage stabilization function. When the bridge converter circuit 102 operates in the first mode, the load DC voltage V Load The normalized gain can be, for example, 1. In some embodiments, the inductor L m,1 This corresponds to the equivalent inductance of transformer T1, or the magnetizing inductance of transformer T1.

[0072] Figure 2B This is a schematic diagram illustrating the operation of the electronic device 100 in a second mode according to an embodiment of the present invention. Figure 2B As shown, when the bridge switching circuit 102 operates in the second mode, the control signal group causes the first transistor Q to... p1 Second transistor Q p2 The fourth transistor Q remains on. p4 The third transistor Q remains in the off state. p3 and the fifth transistor Q p5The system receives a first modulation control signal and a second modulation control signal, respectively. The first modulation control signal is complementary to the second modulation control signal. For example, when the first modulation control signal is at a high voltage level in a square wave signal, the second modulation control signal is at a low voltage level in a square wave signal. When the bridge switching circuit 102 operates in the second mode, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1... ac Because the first transistor Q p1 Second transistor Q p2 Conducting and short-circuiting to the input power supply V in The positive terminal, voltage V ac The voltage is zero. The voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 is zero. cb Voltage +V in The square wave signal is composed of zero voltage. Therefore, the bridge switching circuit 102 operating in the second mode is equivalent to the second resonant slot RT2 operating in the half-bridge LLC working mode.

[0073] When the second resonant slot RT2 operates in half-bridge LLC mode, the input power supply V in Provide current I in And according to the third transistor Q p3 and the fifth transistor Q p5 The alternating switching generates a flow from the second node b through the capacitor C in the second resonant slot RT2. r,2 and inductor L r,2 current i Lr2 and the current flowing through inductor L m,2 current i Lm,2 The primary winding of transformer T1 induces a current i. Lm,2 This causes a corresponding current i to be generated in the secondary winding of transformer T1. s Current i s After transistor Q s1 transistor Q s2 transistor Q s3 and transistor Q s4 After rectification, the current flows through the load resistor R Load This generates a load DC voltage V Load When the bridge converter circuit 102 operates in the second mode, the load DC voltage V Load The normalized gain can be, for example, 2x. In some embodiments, the inductor L m,2 This corresponds to the equivalent inductance of transformer T2, or the magnetizing inductance of transformer T2.

[0074] Figure 2C This is a schematic diagram illustrating the operation of the electronic device 100 in a third mode according to an embodiment of the present invention. Figure 2C As shown, when the bridge switching circuit 102 operates in the third mode, the control signal group causes the first transistor Q to... p1 and the third transistor Q p3 The fifth transistor Q remains in the on state. p5 The second transistor Q remains in the off state. p2 and the fourth transistor Q p4 The first modulation control signal and the second modulation control signal are received respectively. The first modulation control signal is complementary to the second modulation control signal. For example, when the first modulation control signal is at a low voltage level in a square wave signal, the second modulation control signal is at a high voltage level in a square wave signal. When the bridge switching circuit 102 operates in the third mode, and the second transistor Q... p2 Turning on and the fourth transistor Q p4 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Because the first transistor Q p1 Second transistor Q p2 Conducting and short-circuiting to the input power supply V in The positive terminal, voltage V ac The voltage is zero. The voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 is zero. cb Voltage +V in .

[0075] When the bridge converter circuit 102 operates in the third mode, and the fourth transistor Q p4 On and second transistor Q p2 At cutoff, the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 is... cb Because the third transistor Q p3 and the fourth transistor Q p4 Conducting and short-circuiting to the input power supply V in The negative terminal, voltage V cb The voltage is zero. The voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is zero. ac Voltage +V in Therefore, the bridge switching circuit 102 operating in the third mode is equivalent to the first resonant slot RT1 and the second resonant slot RT2 operating simultaneously in the half-bridge LLC working mode.

[0076] When the first resonant slot RT1 and the second resonant slot RT2 operate simultaneously in half-bridge LLC mode, the input power supply V in Provide current I in And according to the second transistor Q p2 and the fourth transistor Q p4The alternating switching generates current flowing from the first node a through the capacitor C in the first resonant slot RT1. r,1 and inductor L r,1 current i Lr1 and the current flowing through inductor L m,1 current i Lm,1 And in the second resonant slot RT2, a flow from the second node b through the capacitor C is generated. r,2 and inductor L r,2 current i Lr2 and the current flowing through inductor L m,2 current i Lm,2 The primary winding of transformer T1 simultaneously induces a current i. Lm,1 Current i Lm,2 This causes a corresponding current i to be generated in the secondary winding of transformer T1. s Current i s After transistor Q s1 transistor Q s2 transistor Q s3 and transistor Q s4 After rectification, the current flows through the load resistor R Load This generates a load DC voltage V Load When the bridge converter circuit 102 operates in the third mode, the load DC voltage V Load The normalized gain can be, for example, 3 times.

[0077] Figure 2D This is a schematic diagram illustrating the operation of the electronic device 100 in a fourth mode according to an embodiment of the present invention. Figure 2D As shown, when the bridge switching circuit 102 operates in the fourth mode, the control signal group causes the third transistor Q to... p3 The first transistor Q remains in the ON state. p1 and the fourth transistor Q p4 Receives the first modulation control signal, and the second transistor Q p2 and the fifth transistor Q p5 The second modulation control signal is received. The first modulation control signal is complementary to the second modulation control signal. When the bridge switching circuit 102 operates in the fourth mode, and the first transistor Q... p1 and the fourth transistor Q p4 The second transistor Q is turned on, but it is not. p2 and the fifth transistor Q p5 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage +V in And the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 cb It is zero voltage.

[0078] When the bridge converter circuit 102 operates in the fourth mode, and the second transistor Q p2 and the fifth transistor Q p5 The transistor is on, but the first transistor Q is not. p1 and the fourth transistor Q p4 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage -V in And the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 cb Voltage +V in Therefore, the bridge converter circuit 102 operating in the fourth mode is equivalent to the first resonant slot RT1 operating in full-bridge LLC mode and the second resonant slot RT2 simultaneously operating in half-bridge LLC mode. When the bridge converter circuit 102 operates in the fourth mode, the load DC voltage V Load The normalized gain can be, for example, 4 times.

[0079] Figure 2E This is a schematic diagram illustrating the operation of the electronic device 100 in a fifth mode according to an embodiment of the present invention. Figure 2E As shown, when the bridge switching circuit 102 operates in the fifth mode, the control signal group causes the first transistor Q to... p1 The fourth transistor Q remains on. p4 and the fifth transistor Q p5 Receives the first modulation control signal, and the second transistor Q p2 and the third transistor Q p3 The second modulation control signal is received. The first modulation control signal is complementary to the second modulation control signal. When the bridge switching circuit 102 operates in the fifth mode, and the fourth transistor Q... p4 and the fifth transistor Q p5 The second transistor Q is turned on, but it is not. p2 and the third transistor Q p3 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage +V in And the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 cb Voltage -V in .

[0080] When the bridge converter circuit 102 operates in the fifth mode, and the second transistor Q p2 and the third transistor Q p3 The fourth transistor Q is on, but it is conducting. p4 and the fifth transistor Q p5 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... acThe voltage is zero, and the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 is... cb Voltage +V in Therefore, the bridge converter circuit 102 operating in the fifth mode is equivalent to the first resonant slot RT1 operating in half-bridge LLC mode and the second resonant slot RT2 simultaneously operating in full-bridge LLC mode. When the bridge converter circuit 102 operates in the fifth mode, the load DC voltage V Load The normalized gain can be, for example, 5 times.

[0081] Figure 2F This is a schematic diagram illustrating the operation of the electronic device 100 in a sixth mode according to an embodiment of the present invention. Figure 2F As shown, when the bridge switching circuit 102 operates in the sixth mode, the control signal group causes the fifth transistor Q to... p5 The first transistor Q remains in the ON state. p1 and the fourth transistor Q p4 Receives the first modulation control signal, and the second transistor Q p2 and the third transistor Q p3 The second modulation control signal is received. The first modulation control signal is complementary to the second modulation control signal. When the bridge switching circuit 102 operates in the sixth mode, and the first transistor Q... p1 and the fourth transistor Q p4 The second transistor Q is turned on, but it is not. p2 and the third transistor Q p3 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage +V in And the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 cb Voltage -V in .

[0082] When the bridge converter circuit 102 operates in the sixth mode, and the second transistor Q p2 and the third transistor Q p3 The transistor is on, but the first transistor Q is not. p1 and the fourth transistor Q p4 At cutoff, the voltage V between the first node a and the third node c at both ends of the first resonant slot RT1 is... ac Voltage -V in And the voltage V between the third node c and the second node b at both ends of the second resonant slot RT2 cb Voltage +V in Therefore, the bridge converter circuit 102 operating in the sixth mode is equivalent to the first resonant slot RT1 and the second resonant slot RT2 simultaneously operating in full-bridge LLC mode. When the bridge converter circuit 102 operates in the sixth mode, the load DC voltage VLoad The normalized gain can be, for example, 6 times.

[0083] Table 1 shows the maximum and minimum output voltage gain of the bridge converter circuit 102 in each mode according to an embodiment of the present invention.

[0084] model Maximum gain Minimum gain First Mode <![CDATA[G 1,max / 2n1]]> <![CDATA[G 1,min / 2n1]]> Second Mode <![CDATA[G 2,max / 2n2]]> <![CDATA[G 2,min / 2n2]]> Third Mode <![CDATA[G 1,max / 2n1+G 2,max / 2n2]]> <![CDATA[G 1,min / 2n1+G 2,min / 2n2]]> Fourth Mode <![CDATA[G 1,max / n1+G 2,max / 2n2]]> <![CDATA[G 1,min / n1+G 2,min / 2n2]]> Fifth Mode <![CDATA[G 1,max / 2n1+G 2,max / n2]]> <![CDATA[G 1,min / 2n1+G 2,min / n2]]> Sixth Mode <![CDATA[G 1,max / n1+G 2,max / n2]]> <![CDATA[G 1,min / n1+G 2,min / n2]]>

[0085] Table 1

[0086] As shown in Table 1, the maximum gain G 1,max This represents the maximum normalized gain that the first resonant slot RT1 can provide. Minimum gain G 1,min This represents the minimum normalized gain that the first resonant slot RT1 can provide. Maximum gain G 2,max This represents the maximum normalized gain that the second resonant slot RT2 can provide. Minimum gain G 2,min This represents the minimum normalized gain that the second resonant tank RT2 can provide. The turns ratio n1 is the turns ratio of the primary and secondary sides of transformer T1. The turns ratio n2 is the turns ratio of the primary and secondary sides of transformer T2. The bridge converter circuit 102 of this invention uses pulse frequency modulation control. Under a fixed pulse width, the operating frequency is adjusted to vary the AC impedance of the resonant tank, thereby achieving the output voltage (i.e., the load DC voltage V). Load The effect of regulation.

[0087] Figure 3 This is a graph showing the relationship between gain and frequency of the electronic device 100 in different operating modes according to an embodiment of the present invention. Figure 3 As shown, the maximum normalized gain of electronic device 100 operating in different modes is 8.4, and the minimum normalized gain is 0.7. Specifically, curve 300 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the first mode (Mode 1). Curve 302 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the second mode (Mode 2). Curve 304 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the third mode (Mode 3). Curve 306 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the fourth mode (Mode 4). Curve 308 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the fifth mode (Mode 5). Curve 310 represents the gain versus frequency relationship of bridge converter circuit 102 operating in the sixth mode (Mode 6). In other words, the maximum normalized gain (e.g., 8.4) of the electronic device 100 operating in different modes comes from the bridge switching circuit 102 operating in the sixth mode, and the minimum normalized gain (0.7) of the electronic device 100 operating in different modes comes from the bridge switching circuit 102 operating in the first mode.

[0088] like Figure 3 As shown, when the bridge switching circuit 102 operates in the first mode, the maximum gain of the electronic device 100 is G. max The minimum gain is 1.25, and the minimum gain is G. min The value is 0.7. When the bridge switching circuit 102 operates in the second mode, the maximum normalized gain of the electronic device 100 is G. max The minimum normalized gain is 2.5, and the minimum normalized gain is G. min The value is 1.25. When the bridge switching circuit 102 operates in the third mode, the maximum normalized gain of the electronic device 100 is G. max The minimum normalized gain is 3.9, and the minimum normalized gain is G. min The maximum normalized gain of the electronic device 100 is 2.5 when the bridge converter circuit 102 operates in the fourth mode. max The minimum normalized gain is 5, and the minimum normalized gain is G. min The maximum normalized gain of the electronic device 100 is 3.9 when the bridge converter circuit 102 operates in the fifth mode. max The minimum normalized gain is 6, and the minimum normalized gain is G. min The maximum normalized gain of the electronic device 100 is 5 when the bridge switching circuit 102 operates in the sixth mode. max The minimum normalized gain is 8.4, and the minimum normalized gain is G. min It is 6.

[0089] Figure 4 This is a flowchart illustrating the parameter design method for an electronic device 100 according to an embodiment of the present invention. Figure 4 As shown, the present invention first sets the resonant frequency f of the first resonant slot RT1 and the second resonant slot RT2. r1 (Step S400). Next, the present invention sets the turns ratio n1 of transformer T1 and the turns ratio n2 of transformer T2 (step S402). Then, the present invention calculates the excitation inductance L of transformers T1 and T2. m (Step S404). The present invention then sets the inductance ratio K and the quality factor Q (step S406). Finally, in step S408, the present invention determines whether the electronic device 100 can achieve the required output voltage (e.g., the load DC voltage V) within the operating frequency range. Load If the output voltage can be achieved within the operating frequency range, the parameter design process of this invention ends. If the output voltage cannot be achieved within the operating frequency range, this invention returns to step S406, that is, resets the inductance ratio K and the quality factor Q until the output voltage can be achieved within the operating frequency range. In some embodiments, the operating frequency range may be, for example, 300±60 kHz, but this invention is not limited thereto.

[0090] Figure 5This is a graph showing the relationship between efficiency and output voltage when the electronic device 100 of this embodiment operates in frequency modulation, asymmetric control, and surge mode. Figure 5 As shown, curve 502 represents the relationship between efficiency and output voltage when the first modulation control signal and a second modulation control signal in electronic device 100 operate in frequency modulation. Curve 500 represents the relationship between efficiency and output voltage when the first modulation control signal and a second modulation control signal in electronic device 100 operate in burst mode. Curve 504 represents the relationship between efficiency and output voltage when the first modulation control signal and a second modulation control signal in electronic device 100 operate in asymmetric control. In some embodiments, when the electronic device 100 of the present invention adjusts the output voltage gain by adding frequency modulation with a fixed operating cycle of 0.5, it also uses asymmetric control with a fixed operating frequency and operating cycle modulation (pulse width modulation) to change the effective voltage on the first resonant slot RT1 and the second resonant slot RT2, thereby adjusting the output voltage gain. Conventional resonant converters increase the operating frequency range to achieve a wider voltage gain range, and increase the operating frequency to reduce the voltage gain in order to achieve a low voltage output.

[0091] However, when the operating frequency is far from the resonant frequency, it is not only difficult to change the voltage gain, but also reduces circuit efficiency. Surge mode is a commonly used control method to reduce voltage gain, but it requires precise voltage feedback and is relatively complex in programming. Based on the above, when the electronic device 100 of the present invention is frequency-modulated to a specified frequency, it rewrites the program to implement simpler non-corresponding control to reduce the voltage gain. Therefore, with the same output voltage, the non-corresponding control method achieves higher efficiency than frequency modulation and surge mode. For example, since the voltage gain changes very little after the operating frequency exceeds 360kHz, the electronic device 100 of the present invention switches to asymmetric control after frequency modulation to 360kHz, i.e., adjusting the duty cycle (i.e., pulse width), but the present invention is not limited to this. For example, when the frequencies of the first modulation control signal and the second modulation control signal in the electronic device 100 are less than or equal to a preset frequency, the first modulation control signal and the second modulation control signal are frequency modulation control signals. When the frequencies of the first modulation control signal and the second modulation control signal in the electronic device 100 are greater than the preset frequency, the first modulation control signal and the second modulation control signal are pulse width modulation control signals (at which point the frequency is fixed). For example, when the electronic device 100 employs non-corresponding control, the bridge converter circuit 102 outputs a primary side wave signal with a duty cycle of A to the first resonant slot RT1, but outputs a primary side wave signal with a duty cycle of B to the second resonant slot RT2. In some embodiments, the duty cycle A is less than the duty cycle B, but the invention is not limited thereto. In some embodiments, the invention utilizes a proportional-integral (PI) controller to adjust the duty cycle of the control signal groups input to each transistor in the bridge converter circuit 102, but the invention is not limited thereto. Each transistor in the bridge converter circuit 102 may be, for example, an N-type metal-oxide-semiconductor field-effect transistor (MOSFET), but the invention is not limited thereto.

[0092] While embodiments of this disclosure are as described above, it should be understood that what is presented above is merely exemplary and not limiting. Many modifications to the exemplary embodiments described above can be made without departing from the spirit and scope of the disclosure. Therefore, the breadth and scope of this disclosure should not be limited by the embodiments described above. Rather, the scope of this disclosure should be defined by the following claims and their equivalents. Although the foregoing disclosure has been illustrated and depicted by one or more related embodiments, equivalent changes and modifications will be conceived by others skilled in the art based on the foregoing specifications and drawings. Furthermore, although a particular feature of this disclosure has been exemplified in one of the related embodiments, such feature may be combined with one or more other features to suit any known or particular application.

[0093] The technical terms used in this specification are for the purpose of describing particular embodiments only and are not intended to be limiting of this disclosure. Unless the context clearly indicates otherwise, the singular form used herein, as well as the plural form, also includes the meaning. Furthermore, the terms “comprising,” “including,” “(having),” “equipped with,” or variations thereof are used either as a detailed description or as a scope of the patent application. The foregoing terms mean “comprising” and are, to some extent, equivalent to the term “comprising.” Unless otherwise defined, all terms used herein (including technical or scientific terms) are to be understood generally by one of ordinary skill in the art to which the foregoing disclosure pertains. It should be further understood that the foregoing terms, as defined in commonly used dictionaries, should be interpreted in the context of the relevant art. Unless expressly defined herein, the foregoing terms are not to be construed as idealized or overly formal.

Claims

1. An electronic device comprising: First resonant slot; A second resonant slot; A transformer pair is electrically connected to the first resonant slot and the second resonant slot; A rectifier circuit is electrically connected to the transformer pair; A bridge converter circuit includes a first node, a second node, and a third node, wherein the first node is electrically connected to a first resonant slot, the second node is electrically connected to a second resonant slot, and the third node is electrically connected to a transformer pair; the bridge converter circuit outputs a primary side wave signal to at least one of the first and second resonant slots according to a control signal group. The transformer converts the primary side wave signal into a secondary side wave signal; the rectifier circuit converts the secondary side wave signal into a load DC voltage. The bridge converter circuit changes the magnitude of the load DC voltage according to the control signal group.

2. The electronic device as claimed in claim 1, wherein, The transformer pair includes: A first transformer is electrically connected to the first resonant slot; A second transformer is electrically connected to the second resonant slot; The primary terminals of the first transformer and the second transformer are electrically connected to the third node. The turns ratio of the second transformer is different from that of the first transformer.

3. The electronic device as claimed in claim 2, wherein, The first resonant groove includes: A first inductor is electrically connected to the first transformer; A first capacitor is electrically connected in series between the first inductor and the first node; The first inductor and the first capacitor change the voltage magnitude of the primary side wave signal according to the input frequency of the signal in the control signal group.

4. The electronic device as claimed in claim 3, wherein, The second resonant groove includes: A second inductor is electrically connected to the second transformer; A second capacitor is electrically connected in series between the second inductor and the second node; The second inductor and the second capacitor change the voltage magnitude of the primary side wave signal according to the input frequency of the signal in the control signal group.

5. The electronic device as claimed in claim 1, wherein, The bridge converter circuit includes: A first transistor is electrically connected between the positive terminal of an input power supply and the first node; A second transistor is electrically connected between the positive terminal of the input power supply and the third node; A third transistor is electrically connected between the second node and the negative terminal of the input power supply; A fourth transistor is electrically connected between the third node and the negative terminal of the input power supply; and A fifth transistor is electrically connected between the first node and the second node; The control signal group is used to control the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor, respectively.

6. The electronic device as claimed in claim 5, wherein, The bridge switching circuit operates in a first mode, a second mode, a third mode, a fourth mode, a fifth mode, or a sixth mode according to the control signal group.

7. The electronic device as claimed in claim 6, wherein, When the bridge switching circuit operates in the first mode, the control signal group keeps the third transistor and the fourth transistor in the on state and the second transistor in the off state. The first transistor and the fifth transistor respectively receive a first modulation control signal and a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

8. The electronic device as claimed in claim 6, wherein, When the bridge switching circuit operates in the second mode, the control signal group keeps the first transistor and the second transistor in the on state, the fourth transistor in the off state, and the third transistor and the fifth transistor respectively receive a first modulation control signal and a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

9. The electronic device as claimed in claim 6, wherein, When the bridge switching circuit operates in the third mode, the control signal group keeps the first transistor and the third transistor in the on state, the fifth transistor in the off state, and the second transistor and the fourth transistor respectively receive a first modulation control signal and a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

10. The electronic device of claim 6, wherein, When the bridge switching circuit operates in the fourth mode, the control signal group keeps the third transistor on, the first transistor and the fourth transistor receive a first modulation control signal, and the second transistor and the fifth transistor receive a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

11. The electronic device of claim 6, wherein, When the bridge switching circuit operates in the fifth mode, the control signal group keeps the first transistor on, the fourth and fifth transistors receive a first modulation control signal, and the second and third transistors receive a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

12. The electronic device of claim 6, wherein, When the bridge switching circuit operates in the sixth mode, the control signal group keeps the fifth transistor on, the first transistor and the fourth transistor receive a first modulation control signal, and the second transistor and the third transistor receive a second modulation control signal; wherein the first modulation control signal is complementary to the second modulation control signal.

13. The electronic device as claimed in claim 1, wherein, The first resonant slot and the second resonant slot change the voltage magnitude of the primary side wave signal according to the input working cycle of the signal in the control signal group.

14. The electronic device as claimed in any one of claims 7 to 12, wherein, The first modulation control signal and the second modulation control signal are frequency modulation control signals.

15. The electronic device as claimed in any one of claims 7 to 12, wherein, When the frequencies of the first modulation control signal and the second modulation control signal are less than or equal to a preset frequency, the first modulation control signal and the second modulation control signal are frequency modulation control signals; when the frequencies of the first modulation control signal and the second modulation control signal are greater than the preset frequency, the first modulation control signal and the second modulation control signal are pulse width modulation control signals.

Images