A dual-path driving power supply circuit, display device, and charging device

Abstract

The application relates to a double-path driving power supply circuit, a display device and a charging device in the technical field of electronic circuits, which comprises a power supply circuit, a negative voltage output control circuit and a positive voltage output control circuit, the power supply circuit, the negative voltage output control circuit and the positive voltage output control circuit are connected with a voltage input end, and the negative voltage output control circuit and the positive voltage output control circuit are further connected with an output end of the power supply circuit, so that the problem that double-path positive and negative voltage stable output cannot be simply controlled is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a dual-channel driving power supply circuit, display device and charging device. BACKGROUND

[0002] The liquid crystal screen on the existing charging pile is driven by a single-channel driving power supply or a driving power supply in the form of a triode push-pull dual-channel positive and negative voltage output, which is basically composed of three parts, namely a control signal, a push-pull circuit and a voltage output circuit. However, the push-pull control waveform of the existing scheme needs additional control, the output voltage range is basically consistent with the push-pull power supply voltage, and the flexibility is not high when different voltages are output, and the control is complex. SUMMARY

[0003] The present application provides a dual-channel driving power supply circuit, display device and charging device to solve the problem of not being able to simply control the stable output of dual-channel positive and negative voltage.

[0004] To solve the above technical problems, the present application solves the problem by the following technical scheme:

[0005] A dual-channel driving power supply circuit, comprising a power supply circuit, a negative voltage output control circuit and a positive voltage output control circuit, wherein the power supply circuit, the negative voltage output control circuit and the positive voltage output control circuit are connected to a voltage input end, and the negative voltage output control circuit and the positive voltage output control circuit are also connected to an output end of the power supply circuit.

[0006] Optionally, the power supply circuit comprises a power supply chip and an energy storage inductor, the voltage input end is connected to an input end of the power supply chip, and the voltage input end is also connected to the energy storage inductor.

[0007] Optionally, the negative voltage output control circuit comprises a first capacitor, a diode one, a diode two and a second capacitor, the diode one and the diode two are connected in parallel, the first capacitor is connected to an anode of the diode one, the first capacitor is also connected to a cathode of the diode two, the second capacitor is connected to a cathode of the diode one, and the second capacitor is also connected to an anode of the diode two, and the diode one, the second capacitor and the diode two form a closed loop.

[0008] Optionally, the positive voltage output control circuit comprises a diode three, a voltage dividing circuit and a third capacitor, a cathode of the diode three is connected to the voltage dividing circuit, and the cathode of the diode three is also connected to the third capacitor.

[0009] Optionally, the negative voltage output control circuit further comprises a first voltage stabilizing tube and a fourth capacitor, the anode of the first voltage stabilizing tube is connected with the anode of the second diode, the cathode of the first voltage stabilizing tube is connected with the negative voltage output terminal, the fourth capacitor is connected with the second capacitor in parallel, and the fourth capacitor is further connected with the negative voltage output terminal.

[0010] Optionally, the voltage dividing circuit comprises a first resistor and a second resistor, and the first resistor is connected with the second resistor in series.

[0011] Optionally, the positive voltage output control circuit comprises a second voltage stabilizing tube and a fifth capacitor, the cathode of the second voltage stabilizing tube is connected with the cathode of the third diode, the anode of the second voltage stabilizing tube is connected with the positive voltage output terminal, the fifth capacitor is connected with the third capacitor in parallel, and the fifth capacitor is further connected with the positive voltage output terminal.

[0012] Optionally, the sixth capacitor is further connected with the voltage input terminal.

[0013] A display device, which is powered by the dual-channel driving power supply circuit according to any one of the above.

[0014] A charging device, which comprises the dual-channel driving power supply circuit according to any one of the above.

[0015] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0016] The power supply circuit outputs stable and adjustable voltage, and the voltage at the feedback point of the power supply circuit is adjusted according to the voltage division of the first resistor and the second resistor, so that the required output voltage is obtained, the positive voltage and the negative voltage are obtained by the reverse blocking effect of the diode and the storage of the capacitor, and the required output voltage is obtained by the first voltage stabilizing tube and the second voltage stabilizing tube, so that the output requirement of any positive and negative dual-channel voltage under any circuit is realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A circuit diagram of a dual-channel driving power supply circuit is provided for the first embodiment. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0020] Example 1

[0021] like Figure 1 The diagram shows a dual-path drive power supply circuit, which includes a power supply circuit, a negative voltage output control circuit, and a positive voltage output control circuit. The power supply circuit, the negative voltage output control circuit, and the positive voltage output control circuit are all connected to the voltage input terminal. The negative voltage output control circuit and the positive voltage output control circuit are also connected to the output terminal of the power supply circuit.

[0022] Specifically, the power supply circuit includes a power supply chip and an energy storage inductor. The voltage input terminal is connected to the input terminal of the power supply chip and is also connected to the energy storage inductor. The power supply chip is a DC / DC power supply chip, and the in pin of the DC / DC power supply chip is connected to the voltage input terminal Vin. The SW pin of the DC / DC power supply chip is used to control the output high or low level, and the FB pin is the feedback pin. The voltage input terminal Vin is also connected to the sixth capacitor C6, and the sixth capacitor C6 is a filter capacitor. The sixth capacitor C6 is grounded.

[0023] Furthermore, the positive voltage output control circuit includes a third diode, a voltage divider circuit, and a third capacitor. The cathode of the third diode is connected to the voltage divider circuit, and the cathode of the third diode is also connected to the third capacitor. The voltage divider circuit includes a first resistor and a second resistor, which are connected in series. The positive voltage control output circuit includes a second Zener diode and a fifth capacitor. The cathode of the second Zener diode is connected to the cathode of the third diode, and the anode of the second Zener diode is connected to the positive output terminal. The fifth capacitor is connected in parallel with the third capacitor, and the fifth capacitor is also connected to the positive voltage output terminal.

[0024] Specifically, the end of the energy storage inductor L1 furthest from the voltage input terminal Vin is connected to the anode of diode 3D3. The SW pin of the DC / DC power supply chip is also connected to the anode of diode 3D3. The cathode of diode 3D3 is connected to the cathode of Zener diode 2D5. The anode of Zener diode 2D5 is connected to the positive output terminal Vo-P. A third capacitor C3 and a fifth capacitor C5 are connected in parallel on Zener diode 2D5. One end of the fifth capacitor C5 is grounded. The cathode of diode 3D3 is also connected to the first resistor R1. The end of the first resistor R1 furthest from diode 3D3 is connected to the second resistor R2. The other end of the second resistor R2 is grounded. The end of the first resistor R1 closest to the second resistor is also connected to the FB pin of the DC / DC power supply chip.

[0025] Further, the positive voltage output logic principle is that when the positive voltage is output, the DC / DC power chip controls the SW pin to cooperate with the energy storage inductor L1 to output a square wave of a certain frequency, and the peak voltage of the square wave is adjusted by the first resistor R1 and the second resistor R2 of the voltage dividing circuit. When the SW pin outputs a high level, the diode three D3 is turned on to charge the third capacitor C3 as an energy storage capacitor. The voltage on the third capacitor C3 slowly rises to a stable value within a few cycles. At this time, the voltage stabilizing tube two D5 selects appropriate voltage stabilizing tube parameters according to the actual situation, and outputs a stable positive voltage value after voltage stabilization.

[0026] On the other hand, the negative voltage output control circuit includes a first capacitor, a diode one, a diode two and a second capacitor. The diode one and the diode two are connected in parallel. The first capacitor is connected to the anode of the diode one. The first capacitor is also connected to the cathode of the diode two. The second capacitor is connected to the cathode of the diode one. The second capacitor is also connected to the anode of the diode two. The diode one, the second capacitor and the diode two form a closed loop.

[0027] The negative voltage output control circuit further includes a voltage stabilizing tube one and a fourth capacitor. The anode of the voltage stabilizing tube one is connected to the anode of the diode two. The cathode of the voltage stabilizing tube one is connected to the negative voltage output end. The fourth capacitor is connected in parallel with the second capacitor. The fourth capacitor is also connected to the negative voltage output end.

[0028] Specifically, the first capacitor C1 is connected to the energy storage inductor L1 and also connected to the SW pin of the DC / DC power chip. The other end of the first capacitor C1 is connected to the cathode of the diode two D2. The anode of the diode two D2 is connected to the anode of the voltage stabilizing tube one D4. The cathode of the voltage stabilizing tube one D4 is connected to the negative voltage output end Vo-N. The first capacitor D1 is also connected to the anode of the diode one D1. The cathode of the diode one D1 is connected to the second capacitor C2. The cathode of the diode one D1 is also connected to the ground. The other end of the second capacitor C2 away from the diode one D1 is also connected to the anode of the diode two D2, so that the diode two D2, the diode one D1 and the second capacitor C2 form a closed loop. One end of the fourth capacitor C4 is connected to the second capacitor C2. The other end of the fourth capacitor C4 is connected to the negative voltage output end.

[0029] The negative voltage output logic principle is that when the SW pin of the DC / DC power chip outputs a high level, the electrical energy passes through the energy storage inductor L1, then through the first capacitor C1, and then through the diode one D1 to charge the first capacitor C1. After the first capacitor C1 is charged, the polarity is positive at the bottom and negative at the top. The diode two D2 cannot be turned on due to reverse blocking. Then the SW pin outputs a low level. At this time, the first capacitor C1, the diode two D2 and the second capacitor C2 form a loop. At this time, the second capacitor C2 is charged, and the polarity is also positive at the bottom and negative at the top. Then after passing through the voltage stabilizing tube one D4, a negative voltage can be output.

[0030] Thus, the controllable and adjustable double-channel voltage is output by the DC / DC power chip, one positive voltage and one negative voltage, the size of the output voltage can be adjusted by the voltage dividing resistor (the first resistor R1 and the second resistor R2), the negative output voltage can be realized by the energy storage capacitor, i.e., the first capacitor C1, the diode D1 and the stabilizing tube D4; the positive voltage can be realized by the diode D3 and the DC / DC power supply after rectification and filtering.

[0031] Embodiment two

[0032] A display device, the display device is powered by the double-channel driving power supply circuit as claimed in any one of the embodiments, the display device can be an LCD liquid crystal screen, or other display screens which need to be powered by the double-channel driving power supply, which is not specifically limited here.

[0033] Embodiment three

[0034] A charging device, the charging device comprises the double-channel driving power supply circuit as claimed in any one of the embodiments, the charging device can be a charging pile, and the charging pile has the LCD liquid crystal screen as claimed in embodiment two for displaying charging data, and the LCD liquid crystal screen is powered by the double-channel driving power supply circuit as claimed in embodiment one.

[0035] The above is only the preferred embodiment of the present application, and is not any form and substantial limitation of the present application. It should be noted that, for ordinary skilled in the art, without departing from the method of the present application, a number of improvements and supplements can also be made, which should be considered as the protection scope of the present application. For those skilled in the art, without departing from the spirit and scope of the present application, some changes, modifications and equivalent variations can be made by using the disclosed technical content, which are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application are still within the scope of the technical solutions of the present application.

Claims

1. A two-way drive power supply circuit, characterized by comprising: The power supply circuit, the negative voltage output control circuit and the positive voltage output control circuit are connected with the voltage input end, and the negative voltage output control circuit and the positive voltage output control circuit are also connected with the output end of the power supply circuit; The negative voltage output control circuit comprises a first capacitor, a diode one, a diode two and a second capacitor, the diode one and the diode two are connected in parallel, the first capacitor is connected with the anode of the diode one, the first capacitor is also connected with the cathode of the diode two, the second capacitor is connected with the cathode of the diode one, the second capacitor is also connected with the anode of the diode two, and the diode one, the second capacitor and the diode two form a closed loop, the positive voltage output control circuit comprises a diode three, a voltage dividing circuit and a third capacitor, the cathode of the diode three is connected with the voltage dividing circuit, and the cathode of the diode three is also connected with the third capacitor; The negative voltage output control circuit further comprises a stabilizing tube one and a fourth capacitor, the anode of the stabilizing tube one is connected with the anode of the diode two, the cathode of the stabilizing tube one is connected with the negative voltage output end, and the fourth capacitor is connected with the second capacitor in parallel, and the fourth capacitor is also connected with the negative voltage output end; The voltage dividing circuit comprises a first resistor and a second resistor, and the first resistor and the second resistor are connected in series; The positive voltage output control circuit comprises a stabilizing tube two and a fifth capacitor, the cathode of the stabilizing tube two is connected with the cathode of the diode three, the anode of the stabilizing tube two is connected with the positive voltage output end, and the fifth capacitor is connected with the third capacitor in parallel, and the fifth capacitor is also connected with the positive voltage output end.

2. A dual drive power supply circuit according to claim 1, wherein The power supply circuit comprises a power supply chip and an energy storage inductor, the voltage input end is connected with the input end of the power supply chip, and the voltage input end is also connected with the energy storage inductor.

3. A dual drive power supply circuit according to claim 1, wherein A sixth capacitor is further connected with the voltage input end.

4. A display device, characterized by comprising: The display device is powered by the dual-path driving power supply circuit according to any one of claims 1 or 2.

5. A charging device, characterized by The charging device comprises the dual-path driving power supply circuit according to any one of claims 1 or 2.

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