Straight-through switch control device for DC-DC conversion circuit

Abstract

The utility model discloses a pass-through switch control device used for a DC-DC conversion circuit, the DC-DC conversion circuit is connected between an input module and an output module, the output module is also connected with a protocol circuit, the output module comprises a pass-through control module and a pass-through switch driving module, the direct connection switch driving module generates a direct connection starting signal and a bias signal according to the output of the DC-DC conversion circuit, the direct connection control module conducts the input module and the output module under the control of the direct connection starting signal, and the DC-DC conversion circuit is in a maximum duty ratio state under the control of the bias signal; the protocol circuit converts the output voltage demand of the output module into a constant current source voltage regulating signal, the through switch driving module generates a through closing signal according to the constant current source voltage regulating signal, and the through control module disconnects the input module and the output module under the control of the through closing signal. Therefore, direct connection can be realized without binding with a specific protocol, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and in particular to a through switch control device for a DC-DC conversion circuit. Background Art

[0002] Due to the improvement in the self-regulation of PD power supply compared to traditional USB power supply, it has the following advantages: diversified output configuration (for example, diversified customization, diversified combination, etc.); wide dynamic output voltage (for example, 3.3-48V output is continuously adjustable); output current up to 5A.

[0003] Given the diverse outputs, most power supply topologies are AC / DC + DC / DC (one or multiple). The addition of a DC / DC stage further reduces efficiency. Output current typically reaches a maximum of 3A-5A, so higher output voltages increase output power and heat generation. Therefore, direct DC / DC flow at high power levels is desirable to improve overall efficiency. However, conventional protocols don't support direct DC / DC flow. Customized chips may be able to achieve this, but these typically bundle the DC / DC with the protocol, leading to high costs, supply difficulties, and inflexible solution selection.

[0004] Based on this, a new solution is needed. Utility Model Content

[0005] The main purpose of the utility model is to provide a through switch control device for a DC-DC conversion circuit.

[0006] To achieve the above-mentioned object, the present invention provides a through switch control device for a DC-DC conversion circuit, which is connected to the DC-DC conversion circuit, wherein the DC-DC conversion circuit is connected between an input module and an output module, and the output module is further connected to a protocol circuit, comprising a through control module and a through switch driving module, wherein the input end of the through control module is connected to the output end of the input module, the output end of the through control module is connected to the input end of the output module, the first input end of the through switch driving module is connected to the output end of the DC-DC conversion circuit, the second input end of the through switch driving module is connected to the output end of the protocol circuit, and the first output end of the through switch driving module is connected to the through control module. The control module comprises a control end of the pass switch driving module, a second output end of the pass switch driving module is connected to the feedback end of the DC-DC conversion circuit, the pass switch driving module generates a pass start signal and a bias signal according to the output of the DC-DC conversion circuit, the pass control module turns on the input module and the output module under the control of the pass start signal, and the DC-DC conversion circuit is in a maximum duty cycle state under the control of the bias signal; the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulation signal, the pass switch driving module generates a pass stop signal according to the constant current source voltage regulation signal, and the pass control module disconnects the input module and the output module under the control of the pass stop signal.

[0007] In the through-switch control device for a DC-DC conversion circuit provided by the present invention, the through-control module includes a seventh resistor R7, an eighth resistor R8, and a field-effect transistor Q1. The gate of the field-effect transistor Q1 is connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the first output end of the through-switch driving module. The source of the field-effect transistor Q1 is connected to the second end of the seventh resistor R7 and the input pin of the DC-DC conversion circuit. The drain of the field-effect transistor Q1 is connected to the output pin of the DC-DC conversion circuit.

[0008] The pass switch control device for a DC-DC conversion circuit provided by the present invention further includes a fifth resistor R5 and a sixth resistor R6, wherein a first end of the fifth resistor R5 is connected to an output pin of the DC-DC conversion circuit, a second end of the fifth resistor R5 is connected to a second input end of the pass switch driving module, a first end of the sixth resistor R6, and a feedback end of the DC-DC conversion circuit, and a second end of the sixth resistor R6 is grounded.

[0009] In the through switch control device for a DC-DC conversion circuit provided by the present invention, the through switch driving module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, a first adjustable precision voltage regulator IC1, and a second adjustable precision voltage regulator IC2. The first end of the first resistor R1 is connected to the output pin of the DC-DC conversion circuit as the first input end of the through switch driving module, and the second end of the first resistor R1 is connected to the first end of the second resistor R2, the control end of the first adjustable precision voltage regulator IC1, and the second adjustable precision voltage regulator IC2. The cathode of IC2, the cathode of the first adjustable precision voltage regulator IC1 is connected to the negative electrode of the diode D1 and the second end of the eighth resistor R8, the positive electrode of the diode D1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the first end of the third resistor R3, the second end of the fifth resistor R5 and the output end of the protocol circuit, the second end of the third resistor R3 is connected to the control end of the second adjustable precision voltage regulator IC2, the second end of the second resistor R2, the anode of the first adjustable precision voltage regulator IC1, and the anode of the second adjustable precision voltage regulator IC2 are grounded.

[0010] The through-switch control device for a DC-DC conversion circuit provided by the present invention has the following beneficial effects: the through-switch control device for a DC-DC conversion circuit provided by the present invention, the through-switch driving module determines whether to provide a through-on signal to the through-switch control module through the output voltage of the DC / DC conversion circuit so as to control the direct connection of the input module and the output module through the through-switch control module, thereby entering a through-state; after the through-state is turned on, the through-switch driving module determines whether to provide a through-off signal to the through-switch control module through the change of the constant current source voltage regulation signal so as to control the disconnection of the input module and the output module through the through-switch control module, thereby ending the through-state, thereby achieving through-switch without being bound to a specific protocol, with a simple structure and low cost. In addition, in the through-state, the through-switch driving module simultaneously provides a bias signal to the DC / DC conversion circuit so that the DC / DC is in a maximum duty cycle state, thereby making the DC / DC conversion circuit completely lossless or reducing loss in the through-state. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without inventive work.

[0012] Figure 1FIG2 is a schematic diagram of a through switch control device for a DC-DC conversion circuit provided by an embodiment of the present invention;

[0013] Figure 2 FIG2 is a circuit diagram of a through switch control device for a DC-DC conversion circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0014] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0016] Figure 1 The figure shows a schematic diagram of a through switch control device for a DC-DC conversion circuit provided by an embodiment of the present invention. Figure 1 As shown, the direct switch control device for the DC-DC conversion circuit provided by the present invention is connected to the DC-DC conversion circuit 10, wherein the DC-DC conversion circuit 10 is connected between the input module 20 and the output module 30, that is, the input pin of the DC-DC conversion circuit 10 is connected to the input module 20, and the output pin is connected to the output module 30, for converting the input voltage into DC-DC and outputting it to the output module 30 for use by the load. Figure 1 As shown, the output module 30 is also connected to the protocol circuit 40, that is, the input end of the protocol circuit 40 is connected to the output module 30, which is used to convert the load demand into a constant current source voltage regulation signal when the load demand changes.

[0017] See Figure 1The through-switch control device for a DC-DC conversion circuit provided by the present invention includes a through-switch control module 50 and a through-switch driving module 60, wherein the input end of the through-switch control module 50 is connected to the output end of the input module 20, the output end of the through-switch control module 50 is connected to the input end of the output module 30, the first input end of the through-switch driving module 60 is connected to the output end of the DC-DC conversion circuit 10, the second input end of the through-switch driving module 60 is connected to the output end of the protocol circuit 40, the first output end of the through-switch driving module 60 is connected to the control end of the through-switch control module 50, and the second output end of the through-switch driving module 60 is connected to the feedback end of the DC-DC conversion circuit 10. Specifically, the pass switch driving module 60 generates a pass-through start signal and a bias signal according to the output of the DC-DC conversion circuit 10. The pass control module 50 turns on the input module 20 and the output module 30 under the control of the pass-through start signal, and the DC-DC conversion circuit 10 is in the maximum duty cycle state under the control of the bias signal. The protocol circuit 40 converts the output voltage requirement of the output module 30 into a constant current source voltage regulation signal. The pass switch driving module 60 generates a pass-through close signal according to the constant current source voltage regulation signal. The pass control module 50 disconnects the input module 20 and the output module 30 under the control of the pass-through close signal.

[0018] In this embodiment, the pass-through switch driver module uses the output voltage of the DC / DC converter circuit to determine whether to provide a pass-through start signal to the pass-through control module, thereby controlling the direct connection between the input module and the output module through the pass-through control module, thus entering the pass-through state. After the pass-through is enabled, the pass-through switch driver module uses the change in the constant current source voltage regulation signal to determine whether to provide a pass-through stop signal to the pass-through control module, thereby controlling the disconnection between the input module and the output module through the pass-through control module, thus ending the pass-through state. Thus, pass-through can be achieved without being bound to a specific protocol, resulting in a simple structure and low cost. Furthermore, in the pass-through state, the pass-through switch driver module simultaneously provides a bias signal to the DC / DC converter circuit, placing the DC / DC in a maximum duty cycle state, thereby ensuring that the DC / DC converter circuit is completely lossless or has reduced losses in the pass-through state.

[0019] Figure 2 FIG. 1 is a circuit diagram of a through switch control device for a DC-DC conversion circuit provided by an embodiment of the present invention. Figure 2 As shown, a fifth resistor R5 and a sixth resistor R6 are also included, wherein a first end of the fifth resistor R5 is connected to an output pin of the DC-DC conversion circuit 10, a second end of the fifth resistor R5 is connected to a second input end of the pass switch driving module 60, a first end of the sixth resistor R6 and a feedback end of the DC-DC conversion circuit 10, and a second end of the sixth resistor R6 is grounded.

[0020] Specifically, if Figure 2 As shown, the pass switch driving module 60 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, a first adjustable precision voltage regulator IC1, and a second adjustable precision voltage regulator IC2. The first end of the first resistor R1 serves as the first input end of the pass switch driving module 60 and is connected to the output pin of the DC-DC conversion circuit 10. The second end of the first resistor R1 is connected to the first end of the second resistor R2, the control end of the first adjustable precision voltage regulator IC1, and the cathode of the second adjustable precision voltage regulator IC2. The cathode of the first adjustable precision voltage regulator IC1 is connected to the cathode of the diode D1 and the second end of the eighth resistor R8. The anode of the diode D1 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the first end of the third resistor R3, the second end of the fifth resistor R5, and the output end of the protocol circuit 40. The second end of the third resistor R3 is connected to the control end of the second adjustable precision voltage regulator IC2. The second end of the second resistor R2, the anode of the first adjustable precision voltage regulator IC1, and the anode of the second adjustable precision voltage regulator IC2 are grounded. The pass-through control module 50 includes a seventh resistor R7, an eighth resistor R8 and a field-effect transistor Q1. The gate of the field-effect transistor Q1 is connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the first output end of the pass-through switch driving module 60. The source of the field-effect transistor Q1 is connected to the second end of the seventh resistor R7 and the input pin of the DC-DC conversion circuit 10. The drain of the field-effect transistor Q1 is connected to the output pin of the DC-DC conversion circuit 10.

[0021] The first resistor R1 and the second resistor R2 feed the "positive output" signal back to the first adjustable precision voltage regulator IC1. When the "positive output" voltage reaches the required voltage for direct-pass operation, the first adjustable precision voltage regulator IC1 turns on, turning on the field-effect transistor Q1 of the direct-pass control module. The direct-pass control module connects the input module and the output module, entering a direct-pass state. The voltage from the input module is directly output to the output module through the direct-pass control module. Simultaneously, when the first adjustable precision voltage regulator IC1 turns on, a bias signal is fed back to the DC / DC converter circuit via the fourth resistor R4 and diode D1, maintaining the DC / DC converter circuit in its maximum duty cycle state.

[0022] When the first adjustable precision voltage regulator IC1 is in the on state, the constant current source voltage regulation signal from the protocol circuit reduces the constant current value, thereby lowering the output positive voltage. Since the output is not controlled by the DC / DC converter circuit in the pass-through state, when the constant current source voltage regulation signal decreases the constant current value, the voltage divided by the fifth resistor R5 and the sixth resistor R6 will be higher. This voltage then provides a feedback signal to the control terminal of the second adjustable precision voltage regulator IC2 through the third resistor R3, turning the second adjustable precision voltage regulator IC2 on. After the second adjustable precision voltage regulator IC2 turns on, it pulls down the control terminal of the first adjustable precision voltage regulator IC1, turning it off. This in turn turns off the field-effect transistor Q1 of the pass-through control module, thus exiting the pass-through state. In the non-pass-through state, the output is controlled by the DC / DC converter circuit. The DC / DC converter circuit feedback voltage will not exceed the control turn-on voltage of the second adjustable precision voltage regulator IC2, thus not affecting the normal pass-through determination of the first resistor R1, the second resistor R2, and the first adjustable precision voltage regulator IC1.

[0023] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0024] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various invention aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, invention aspects lie in less than all of the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0025] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination.

[0026] It should be noted that the above embodiments illustrate rather than limit the present invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A through switch control device for a DC-DC conversion circuit, connected to a DC-DC conversion circuit (10), wherein the DC-DC conversion circuit (10) is connected between an input module (20) and an output module (30), and wherein the output module (30) is further connected to a protocol circuit (40), characterized in that: The invention comprises a through control module (50) and a through switch driving module (60), wherein the input end of the through control module (50) is connected to the output end of the input module (20), the output end of the through control module (50) is connected to the input end of the output module (30), the first input end of the through switch driving module (60) is connected to the output end of the DC-DC conversion circuit (10), the second input end of the through switch driving module (60) is connected to the output end of the protocol circuit (40), the first output end of the through switch driving module (60) is connected to the control end of the through control module (50), and the second output end of the through switch driving module (60) is connected to the feedback end of the DC-DC conversion circuit (10). The through switch driving module (60) generates a through start signal and a bias signal according to the output of the DC-DC conversion circuit (10); the through control module (50) switches on the input module (20) and the output module (30) under the control of the through start signal; the DC-DC conversion circuit (10) is in a maximum duty cycle state under the control of the bias signal; the protocol circuit (40) converts the output voltage requirement of the output module (30) into a constant current source voltage regulation signal; the through switch driving module (60) generates a through close signal according to the constant current source voltage regulation signal; and the through control module (50) disconnects the input module (20) and the output module (30) under the control of the through close signal.

2. The through switch control device for a DC-DC conversion circuit according to claim 1, wherein: The through control module (50) comprises a seventh resistor R7, an eighth resistor R8 and a field effect transistor Q1, the gate of the field effect transistor Q1 being connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8, the second end of the eighth resistor R8 being connected to the first output end of the through switch driving module (60), the source of the field effect transistor Q1 being connected to the second end of the seventh resistor R7 and the input pin of the DC-DC conversion circuit (10), and the drain of the field effect transistor Q1 being connected to the output pin of the DC-DC conversion circuit (10).

3. The through switch control device for a DC-DC conversion circuit according to claim 2, wherein: It also includes a fifth resistor R5 and a sixth resistor R6, wherein a first end of the fifth resistor R5 is connected to an output pin of the DC-DC conversion circuit (10), a second end of the fifth resistor R5 is connected to a second input end of the through switch driving module (60), a first end of the sixth resistor R6 and a feedback end of the DC-DC conversion circuit (10), and a second end of the sixth resistor R6 is grounded.

4. The through switch control device for a DC-DC conversion circuit according to claim 3, wherein: The through switch driving module (60) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a diode D1, a first adjustable precision voltage regulator IC1, and a second adjustable precision voltage regulator IC2; the first end of the first resistor R1 is connected to the output pin of the DC-DC conversion circuit (10) as the first input end of the through switch driving module (60); the second end of the first resistor R1 is connected to the first end of the second resistor R2, the control end of the first adjustable precision voltage regulator IC1, and the cathode of the second adjustable precision voltage regulator IC2; the first adjustable The cathode of the adjustable precision voltage-stabilizing source IC1 is connected to the cathode of the diode D1 and the second end of the eighth resistor R8, the anode of the diode D1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the first end of the third resistor R3, the second end of the fifth resistor R5 and the output end of the protocol circuit (40), the second end of the third resistor R3 is connected to the control end of the second adjustable precision voltage-stabilizing source IC2, the second end of the second resistor R2, the anode of the first adjustable precision voltage-stabilizing source IC1 and the anode of the second adjustable precision voltage-stabilizing source IC2 are grounded.

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