Voltage drive circuits and electronic equipment

Abstract

The present application discloses a voltage drive circuit and electronic device, relating to the field of electronic circuit technology. The voltage drive circuit includes a power management chip and a first voltage adjustment module, wherein: a first pin of the power management chip is connected to an initial power source, a second pin of the power management chip is connected to a first end of the first voltage adjustment module, a third pin of the power management chip is connected to a second end of the first voltage adjustment module, and a fourth pin of the power management chip is connected to a third end of the first voltage adjustment module; the third end of the first voltage adjustment module serves as a first voltage output end. This voltage drive circuit is a low-hardware-cost voltage drive circuit that can be implemented using a common power management chip, and this voltage drive circuit reduces the selection limitations of electrical devices such as LEDs.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and more specifically, to a voltage driving circuit and an electronic device. Background Art

[0002] With the development of technology, projection equipment has been used more and more widely.

[0003] Currently, projection equipment can only project images with the help of a light source. Projection equipment typically uses current-type LEDs as their light source. For high-brightness applications, the current of power-type LEDs must be set very high to achieve high-brightness light. However, setting the current of power-type LEDs very high not only increases the hardware circuit costs of the external driver circuits for power-type LEDs, but also limits the selection of LEDs.

[0004] Therefore, how to provide a driving circuit with low hardware cost and reduced limitations in LED selection becomes an urgent problem to be solved. Summary of the Invention

[0005] One purpose of this application is to provide a new technical solution for voltage drive circuits.

[0006] According to a first aspect of the present application, a voltage driving circuit is provided, including a power management chip and a first voltage adjustment module, wherein:

[0007] The first pin of the power management chip is connected to the initial power supply, the second pin of the power management chip is connected to the first end of the first voltage adjustment module, the third pin of the power management chip is connected to the second end of the first voltage adjustment module, and the fourth pin of the power management chip is connected to the third end of the first voltage adjustment module;

[0008] The third terminal of the first voltage adjustment module serves as a first voltage output terminal.

[0009] Optionally, the circuit further includes a second voltage adjustment module, wherein:

[0010] The fifth pin of the power management chip is connected to the first end of the second voltage adjustment module, the sixth pin of the power management chip is connected to the second end of the second voltage adjustment module, and the seventh pin of the power management chip is connected to the third end of the second voltage adjustment module;

[0011] The third terminal of the second voltage adjustment module serves as a second voltage output terminal.

[0012] Optionally, the first voltage adjustment module includes a first inductor and a first diode, wherein:

[0013] The first end of the first inductor is connected to the second pin of the power management chip, the second end of the first inductor is connected to the anode of the first diode, the anode of the first diode is connected to the third pin of the power management chip, and the cathode of the first diode is connected to the fourth pin of the power management chip;

[0014] Alternatively, the first end of the first inductor is grounded, the second end of the first inductor is connected to the cathode of the first diode, the cathode of the first diode is connected to the third pin of the power management chip, and the anode of the first diode is connected to the second pin and the fourth pin of the power management chip.

[0015] Optionally, the power management chip includes a switch, the first end of the switch is connected to the second pin of the power management chip, the second end of the switch is connected to the fifth pin of the power management chip, and the control end of the switch is connected to the eighth pin of the power management chip.

[0016] Optionally, the circuit further includes at least one of a first interference filtering module and a second interference filtering module, wherein:

[0017] The first interference filtering module is connected between the first voltage output terminal and the ground;

[0018] The second interference filtering module is connected between the second voltage output terminal and ground.

[0019] Optionally, the first interference filtering module is a first capacitor submodule, and the second interference filtering module is a second capacitor submodule.

[0020] Optionally, the circuit further includes at least one of a first load and a second load, wherein:

[0021] The first load is connected between the third terminal of the first voltage adjustment module and the ground;

[0022] The second load is connected between the third terminal of the second voltage adjustment module and the ground.

[0023] Optionally, the first load is a first resistor, and the second load is a second resistor.

[0024] Optionally, the switch is a MOS switch.

[0025] According to a second aspect of the present application, an electronic device is provided, comprising the voltage driving circuit as described in any one of the first aspects above.

[0026] In this embodiment, a voltage driving circuit is provided, comprising: a power management chip and a first voltage adjustment module. A first pin of the power management chip is connected to an initial power source, a second pin of the power management chip is connected to a first terminal of the first voltage adjustment module, a third pin of the power management chip is connected to a second terminal of the first voltage adjustment module, and a fourth pin of the power management chip is connected to a third terminal of the first voltage adjustment module. The third terminal of the first voltage adjustment module serves as a first voltage output terminal. This voltage driving circuit allows a high voltage, which is greater than the initial power source, to be applied to an electrical device. Thus, when the electrical device is an LED in a projection device, the LED can emit high-brightness light. Furthermore, the voltage driving circuit outputs a voltage to drive the electrical device, simplifying the selection of electrical devices such as LEDs. Furthermore, the voltage driving circuit has a simple structure, resulting in low hardware costs. Furthermore, it can be implemented using a common power management chip. In other words, this embodiment provides a low-cost voltage driving circuit that can be implemented using a common power management chip and reduces the selection limitations of electrical devices such as LEDs.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0029] Figure 1 This is a schematic diagram of the structure of a voltage drive circuit provided in an embodiment of the present application. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of a voltage drive circuit provided in an embodiment of the present application. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the structure of a voltage drive circuit provided in an embodiment of the present application. Figure 3 ;

[0032] Reference numerals:

[0033] 100- voltage driving circuit; 110- power management chip;

[0034] 120 - first voltage adjustment module; 121 - first inductor; 122 - first diode;

[0035] 130 - second voltage adjustment module; 131 - second inductor; 132 - second diode;

[0036] 140-switch; 150-first interference filtering module; 160-second interference filtering module;

[0037] 151 - first capacitor submodule; 161 - second capacitor submodule;

[0038] 170 - first load; 180 - second load; 171 - first resistor; 181 - second resistor. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] The embodiment of the present application provides a voltage driving circuit 100, such as Figure 1 As shown, it includes a power management chip 110 and a first voltage adjustment module 120, wherein:

[0045] A first pin of the power management chip 110 is connected to an initial power source, a second pin of the power management chip 110 is connected to a first end of the first voltage adjustment module 120, a third pin of the power management chip 110 is connected to a second end of the first voltage adjustment module 120, and a fourth pin of the power management chip 110 is connected to a third end of the first voltage adjustment module 120;

[0046] The third terminal of the first voltage adjustment module 120 serves as a first voltage output terminal.

[0047] In this embodiment, the user first writes the target voltage of the powered device to the power management chip 110. This target voltage is greater than the voltage corresponding to the initial power supply. After obtaining the target voltage, the power management chip 110 adjusts the voltage provided by the initial power supply to output a reference voltage matching the target voltage to the second pin of the power management chip 110. This ensures that the target voltage is applied to the powered device when connected to the first voltage output terminal.

[0048] In one example, the powered device may be an LED that provides power to a projection device.

[0049] In this embodiment, the second pin of the power management chip 110 is a boost output pin or a buck output pin.

[0050] In one embodiment, when the second pin of the power management chip 110 is a boost output pin, the second pin of the power management chip 110 can output a voltage higher than the voltage provided by the initial power supply.

[0051] In another embodiment, when the second pin of the power management chip 110 is a step-down output pin, the second pin of the power management chip 110 can output a negative voltage that is lower than the voltage provided by the initial power supply.

[0052] It should be noted that, when the second pin of the power management chip 110 is a step-down output pin, the first end of the first voltage adjustment module 120 and the third end of the first voltage adjustment module 120 are the same end.

[0053] In one example, if the initial power supply is 12V, the target voltage is 24V, and the second pin of the power management chip 110 is a boost output pin, the power management chip 110 can boost the initial power supply so that the second pin outputs a 24V voltage. Based on this, the first voltage output terminal can be connected to the positive terminal of the powered device, while the negative terminal of the powered device is grounded. In this case, a 24V voltage can be applied to the powered device.

[0054] In another example, if the initial power supply is 12V, the target voltage is 24V, and the second pin of the power management chip 110 is a step-down output pin, the power management chip 110 can step down the initial power supply so that the second pin outputs a -24V voltage. Based on this, the first voltage output terminal can be connected to the negative terminal of the powered device, while the positive terminal of the powered device is grounded. In this case, a 24V voltage can be applied to the powered device.

[0055] Alternatively, the power management chip 110 can step down the initial power supply so that the second pin outputs a -12V voltage. On this basis, the first voltage output terminal can be connected to the negative pole of the power-consuming device, while the positive pole of the power-consuming device is connected to the first pin of the power management chip 110, or other power supply that can provide a 12V voltage. At this time, a 24V voltage can be applied to the power-consuming device. It should be noted that when the positive pole of the power-consuming device is connected to other power sources, the user needs to write in the voltage that the other power source can provide in advance so that the power management chip 110 can accurately step down the voltage.

[0056] In this embodiment, the fourth pin of the power management chip 110 is connected to the third terminal of the first voltage adjustment module 120, and the third terminal of the first voltage adjustment module 120 serves as the first voltage output terminal. That is, the fourth pin of the power management chip 110 is connected to the first voltage output terminal. In this way, the power management chip 110 can obtain the actual voltage provided to the power-consuming device through the fourth pin.

[0057] After the power management chip 110 obtains the actual voltage provided to the power-consuming device via the fourth pin, it can compare the actual voltage with the reference voltage to determine whether the actual voltage is the same as the reference voltage and whether there is ripple in the actual voltage. If it is determined that the actual voltage is not the same as the reference voltage and / or there is ripple in the actual voltage, the power management chip 110 can output an adjustment signal via the third pin to cause the first voltage output terminal to output an actual voltage that is the same as the reference voltage and has negligible ripple.

[0058] In one example, the adjustment signal may be a pulse signal. When the actual voltage is less than the reference voltage, the frequency of the pulse signal may be adjusted so that the actual voltage is equal to the reference voltage.

[0059] In this embodiment, a voltage driving circuit 100 is provided, comprising: a power management chip 110 and a first voltage adjustment module 120. A first pin of the power management chip 110 is connected to an initial power source, a second pin of the power management chip 110 is connected to a first terminal of the first voltage adjustment module 120, a third pin of the power management chip 110 is connected to a second terminal of the first voltage adjustment module 120, and a fourth pin of the power management chip 110 is connected to a third terminal of the first voltage adjustment module 120. The third terminal of the first voltage adjustment module 120 serves as a first voltage output terminal. Based on this voltage driving circuit 100, a high voltage greater than the initial power source can be applied to an electrical device. This allows, firstly, for an LED in a projection device to emit high-brightness light. Secondly, the voltage driving circuit 100 outputs a voltage to drive the electrical device, simplifying the selection of electrical devices such as LEDs. Thirdly, the voltage driving circuit 100 has a simple structure, resulting in low hardware costs. Fourthly, this can be implemented using a conventional power management chip 110. That is to say, this embodiment provides a voltage driving circuit 100 with low hardware cost that can be implemented using a common power management chip 110, and the voltage driving circuit 100 reduces the selection limitations of electrical devices such as LEDs.

[0060] In one embodiment, Figure 1 As shown, the voltage driving circuit 100 provided in the embodiment of the present application further includes a second voltage adjustment module 130, wherein:

[0061] The fifth pin of the power management chip 110 is connected to the first end of the second voltage adjustment module 130, the sixth pin of the power management chip 110 is connected to the second end of the second voltage adjustment module 130, and the seventh pin of the power management chip 110 is connected to the third end of the second voltage adjustment module 130;

[0062] The third terminal of the second voltage adjustment module 130 serves as a second voltage output terminal.

[0063] In this embodiment, when the second pin of the power management chip 110 is a boost output pin, the fifth pin of the power management chip 110 is a buck output pin.

[0064] Correspondingly, when the second pin of the power management chip 110 is a step-down output pin, the fifth pin of the power management chip 110 is a step-up output pin.

[0065] Taking the second pin of the power management chip 110 as a boost output pin and the fifth pin of the power management chip 110 as a buck output pin as an example, the following description is made as follows: Figure 1 The voltage driving circuit 100 is shown.

[0066] Combine Figure 1 In the embodiment shown, if the initial power supply is 12V and the target voltage is 24V, the power management chip 110 can determine the reference voltages as 16V and -8V based on the initial power supply and the target voltage. On this basis, the power management chip 110 can first boost the initial power supply so that the second pin outputs a 16V voltage. At the same time, the power management chip 110 steps down the initial power supply so that the fifth pin outputs a -8V voltage. On this basis, the first voltage output terminal is connected to the positive pole of the electrical device, and the second voltage output terminal is connected to the negative pole of the electrical device. At this time, a 24V voltage can be applied to the electrical device.

[0067] The voltage driving circuit 100 provided in the embodiment of the present application can apply a target voltage to an electrical device without relying on an external power supply.

[0068] It should be noted that when the second pin of the power management chip 110 is a buck output pin and the fifth pin of the power management chip 110 is a boost output pin, the working principle of the voltage driving circuit 100 is the same as the principle described in the above example and will not be repeated here.

[0069] In one embodiment, Figure 3 As shown, the first voltage adjustment module 120 includes a first inductor 121 and a first diode 122.

[0070] The first end of the first inductor 121 is connected to the second pin of the power management chip 110, the second end of the first inductor 121 is connected to the anode of the first diode 122, the anode of the first diode 122 is connected to the third pin of the power management chip 110, and the cathode of the first diode 122 is connected to the fourth pin of the power management chip 110.

[0071] Alternatively, the first end of the first inductor 121 is grounded, the second end of the first inductor 121 is connected to the cathode of the first diode, the cathode of the first diode 122 is connected to the third pin of the power management chip 110, and the anode of the first diode 122 is connected to the second pin and the fourth pin of the power management chip 110.

[0072] In this embodiment, when the second pin is a boost output pin, the first end of the first inductor 121 is connected to the second pin of the power management chip 110, the second end of the first inductor 121 is connected to the anode of the first diode 122, the anode of the first diode 122 is connected to the third pin of the power management chip 110, and the cathode of the first diode 122 is connected to the fourth pin of the power management chip 110.

[0073] In this case, when the actual output voltage is lower than the reference voltage, the switching frequency of the first diode 122 can be increased by increasing the frequency of the pulse signal output by the third pin of the power management chip 110, so that the first inductor 121 stores more energy, thereby increasing the actual output voltage to the reference voltage.

[0074] And, in this case, when the actual output voltage is equal to the reference voltage, by maintaining the frequency of the pulse signal, the actual output voltage can be kept increased to the reference voltage.

[0075] When the actual output voltage is greater than the reference voltage, the switching frequency of the first diode 122 can be reduced by reducing the frequency of the pulse signal, so that the first inductor 121 releases energy, thereby reducing the actual output voltage to the reference voltage.

[0076] In this embodiment, when the second pin is a buck output pin, the first end of the first inductor 121 is grounded, the second end of the first inductor 121 is connected to the cathode of the first diode 122, the cathode of the first diode 122 is connected to the third pin of the power management chip 110, and the anode of the first diode 122 is connected to the second pin and the fourth pin of the power management chip 110.

[0077] It should be noted that when the second pin is a buck output pin, the working principle of the first voltage adjustment module 120 composed of the first inductor 121 and the first diode 122 is similar to the working principle of the first voltage adjustment module 120 composed of the first inductor 121 and the first diode 122 when the second pin is a boost output pin, and will not be repeated here.

[0078] In this embodiment, the first voltage adjustment module 120 has a simple structure, so the hardware cost is low.

[0079] In addition, if Figure 3 As shown, the second voltage adjustment module 130 can also adopt the structure of the first voltage adjustment module 120. Its operating principle is the same as that of the first voltage adjustment module 120 and is not further described here. The inductor in the second voltage adjustment module 130 is denoted as the second inductor 131, and the diode in the second voltage adjustment module 130 is denoted as the second diode 132.

[0080] It should be noted that Figure 3 This is shown in the case where the second pin is a boost output pin.

[0081] In one embodiment, Figure 2As shown in Figure 3, the power management chip 110 includes a switch 140, the first end of the switch 140 is connected to the second pin of the power management chip 110, the second end of the switch 140 is connected to the fifth pin of the power management chip 110, and the control end of the switch 140 is connected to the eighth pin of the power management chip 110.

[0082] In this embodiment, the eighth pin of the power management chip 110 is used to receive shutdown information from the powered device. When the power management chip 110 determines that the powered device is powered off via the eighth pin, the control switch 140 is turned on. At this point, the second and fifth pins of the power management chip 110 are connected, enabling the positive and negative voltages output by the power management chip 110 to quickly offset each other. This allows the voltage difference between the first and second voltage output terminals to return to zero very quickly. This allows the powered device to be shut down in a very short period of time.

[0083] In one embodiment, the switch 140 is a MOS transistor. Of course, the switch 140 can be an NPN transistor or a PNP transistor.

[0084] In one embodiment, Figure 2 As shown, the circuit provided in the embodiment of the present application further includes at least one of a first interference filtering module 150 and a second interference filtering module 160, wherein:

[0085] The first interference filtering module 150 is connected between the first voltage output terminal and the ground.

[0086] The second interference filtering module 160 is connected between the second voltage output terminal and the ground.

[0087] In this embodiment, the first interference filtering module 150 is used to filter out noise interference in the voltage outputted by the first voltage output terminal, and the second interference filtering module 160 is used to filter out noise interference in the voltage outputted by the second voltage output terminal.

[0088] In one embodiment, the first interference filtering module 150 is a first capacitor submodule 151 , and the second interference filtering module 160 is a second capacitor submodule 161 .

[0089] In this embodiment, the first capacitor submodule 151 can be a single capacitor or at least two capacitors connected in parallel. Similarly, the second capacitor submodule 161 can be a single capacitor or at least two capacitors connected in parallel.

[0090] It should be noted that Figure 3 In the figure, the first capacitor submodule 151 and the second capacitor submodule 161 are both shown as two capacitors connected in parallel.

[0091] In this embodiment, when the first interference filtering module 150 is a first capacitor submodule 151 and the second interference filtering module 160 is a second capacitor submodule 161, the circuit structure of the first interference filtering module 150 and the second interference filtering module 160 is simple and low-cost. In addition, the first interference filtering module 150 and the second interference filtering module 160 can realize an energy storage function, so that the first voltage output terminal and the second voltage output terminal can output a more stable voltage.

[0092] In one embodiment, Figure 2 As shown, based on the above embodiment, the circuit provided in the embodiment of the present application further includes at least one of a first load 170 and a second load 180 .

[0093] The first load 170 is connected between the third terminal of the first voltage adjustment module 120 and the ground;

[0094] The second load 180 is connected between the third terminal of the second voltage adjustment module 130 and the ground.

[0095] In this embodiment, due to the energy storage function of the first capacitor submodule 151 and the second capacitor submodule 161, the process of returning the voltage of the first voltage output terminal and the second voltage output terminal to zero is prolonged after the power management chip 110 receives the shutdown information of the electric device. Therefore, the first load 170 and the second load 180 can reduce the time it takes for the first voltage output terminal and the second voltage output terminal of the power management chip 110 to return to zero, so that the first voltage output terminal and / or the second voltage output terminal return to zero quickly. In this way, the electric device can be shut down in a very short period of time.

[0096] In one embodiment, Figure 3 As shown, the first load 170 is a first resistor 171 , and the second load 180 is a second resistor 181 .

[0097] An embodiment of the present application further provides an electronic device, which includes a voltage driving circuit 100 provided in any of the above embodiments.

[0098] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A voltage driving circuit, characterized in that: It includes a power management chip, a first voltage adjustment module and a second voltage adjustment module, wherein: The first pin of the power management chip is connected to the initial power supply, the second pin of the power management chip is connected to the first end of the first voltage adjustment module, the third pin of the power management chip is connected to the second end of the first voltage adjustment module, and the fourth pin of the power management chip is connected to the third end of the first voltage adjustment module; the third end of the first voltage adjustment module serves as a first voltage output end; The fifth pin of the power management chip is connected to the first end of the second voltage adjustment module, the sixth pin of the power management chip is connected to the second end of the second voltage adjustment module, and the seventh pin of the power management chip is connected to the third end of the second voltage adjustment module; the third end of the second voltage adjustment module serves as the second voltage output end; The second pin of the power management chip is a boost output pin, the fifth pin is a buck output pin, and the first end and the third end of the second voltage adjustment module are the same end; The power management chip is used to perform a voltage boost process on the initial power supply so that the boost output pin outputs a positive voltage; and to perform a voltage drop process on the initial power supply so that the buck output pin outputs a negative voltage; The power management chip includes a switch, a first end of the switch is connected to the second pin of the power management chip, a second end of the switch is connected to the fifth pin of the power management chip, and a control end of the switch is connected to the eighth pin of the power management chip; wherein the eighth pin of the power management chip is used to receive a shutdown signal, and when the power management chip receives the shutdown signal through the eighth pin, the switch is controlled to be turned on so that the second pin and the fifth pin of the power management chip are connected.

2. The circuit according to claim 1, wherein: The first voltage adjustment module includes a first inductor and a first diode, wherein: The first end of the first inductor is connected to the second pin of the power management chip, the second end of the first inductor is connected to the anode of the first diode, the anode of the first diode is connected to the third pin of the power management chip, and the cathode of the first diode is connected to the fourth pin of the power management chip; Alternatively, the first end of the first inductor is grounded, the second end of the first inductor is connected to the cathode of the first diode, the cathode of the first diode is connected to the third pin of the power management chip, and the anode of the first diode is connected to the second pin and the fourth pin of the power management chip.

3. The circuit according to claim 1, wherein: The circuit further includes at least one of a first interference filtering module and a second interference filtering module, wherein: The first interference filtering module is connected between the first voltage output terminal and the ground; The second interference filtering module is connected between the second voltage output terminal and ground.

4. The circuit according to claim 3, characterized in that The first interference filtering module is a first capacitor submodule, and the second interference filtering module is a second capacitor submodule.

5. The circuit according to claim 4, characterized in that The circuit further includes at least one of a first load and a second load, wherein: The first load is connected between the third terminal of the first voltage adjustment module and the ground; The second load is connected between the third terminal of the second voltage adjustment module and the ground.

6. The circuit according to claim 5, characterized in that The first load is a first resistor, and the second load is a second resistor.

7. The circuit according to claim 1, wherein: The switch is a MOS switch.

8. An electronic device, characterized in that: The electronic device comprises the voltage driving circuit according to any one of claims 1 to 7.

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