Power amplifier integrated starting boost circuit
By using the internal boost circuit of the Bluetooth chip U2 and the amplifier chip U4 in the integrated startup boost circuit of the amplifier signal output distortion when the lithium battery voltage is low, the effect of stable output and louder speakers is achieved, while simplifying the circuit and reducing costs.
Patent Information
- Application Number
- CN202421128042.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-22
AI Technical Summary
When the voltage of lithium batteries is low, the output of the amplifier signal is large, and the existing circuit design requires adding a boost chip, resulting in complex circuits, large space and high cost.
A power amplifier integrated start boost circuit is designed. Through the cooperation of Bluetooth chip U2 and amplifier chip U4, the internal integrated boost circuit is used to achieve a stable output of the lithium battery voltage, avoiding the need to connect multiple lithium batteries in series.
When the lithium battery voltage is low, the stability of the amplifier signal output and the louder sound output of the speaker are achieved, simplifying the circuit circuit and reducing space and cost.
Smart Images
Figure CN222620893U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power amplifier circuit, in particular to a power amplifier integrated starting boost circuit. Background Art
[0002] Most civilian products on the market are powered by lithium batteries. There is a voltage difference when the battery is fully charged and low on power. If the power supply voltage of the power amplifier is different, the distortion of the signal output will be different. Therefore, when the battery voltage is low, the sound will be distorted. In order to solve the voltage difference problem when the lithium battery supplies power to the power amplifier and to increase the power of the power amplifier, a boost chip is added between the lithium battery and the power amplifier, so that the power amplifier has a stable and continuous voltage higher than the battery, to solve the problem of large distortion in the speaker and to enable the speaker to output a louder sound. The existing circuit design requires the addition of boost chips and peripheral components, which makes the circuit complex and takes up space; in addition, the cost of adding a boost chip to the circuit to increase the voltage will also increase. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide an integrated power amplifier starting boost circuit to solve the problem of large distortion when the lithium battery voltage is low; there is no need to connect multiple lithium batteries in series to increase the power of the power amplifier; the circuit is simpler, the space occupied is small, and the cost is low.
[0004] In order to solve the above technical problems, the technical solution of the utility model is: an integrated power amplifier startup boost circuit, including a Bluetooth chip U2 and a power amplifier chip U4, the 46th pin GPIO20 of the Bluetooth chip U2 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the base of the transistor Q2 and one end of the resistor R26, the 24th pin BAT of the Bluetooth chip U2 is respectively connected to the other end of the resistor R26 and one end of the resistor R25, the other end of the resistor R25 is connected to the 6th pin CTRL of the power amplifier chip U4, the lithium battery VDD pin is connected to one end of the inductor L4, the other end of the inductor L4 is respectively connected to the anodes of the diode D6 and the diode D7, and the cathodes of the diode D6 and the diode D7 are both connected to the 15th and 24th pins of the power amplifier chip U4. Principle of the utility model: When the speaker plays sound, the Bluetooth chip U2 The 46th pin of the Bluetooth chip U2 outputs a high level and controls the collector and emitter of the transistor Q3 to be turned on through the diode D5, so that the base pin voltage of the transistor Q2 is connected to the ground, so that the collector and emitter of the transistor Q2 are cut off, so that the 5th pin of the power amplifier chip U4 is not grounded and the power amplifier MUTE signal is released. The voltage of the 24th pin of the Bluetooth chip U2 is divided to the ground by resistors R25 and R27 to provide an ideal starting voltage to the 6th pin of the power amplifier chip U4, thereby triggering the internal boost control circuit of the power amplifier chip U4 to start. When the lithium battery provides the full voltage of 8.4V or the low voltage of 6.6V to the VDD pin, since the integrated boost circuit in the power amplifier has been started, the battery voltage passes through the inductor L4 and diodes D6 and D7 to make the 15th and 24th pins of the power amplifier chip U4 continue to have a boost voltage of 11V, completing a process of both a power amplifier and an integrated chip that can start the boost circuit, solving the problem of the high and low voltage drop of the lithium battery and the problem of adding a boost chip.
[0005] As an improvement, the model of the Bluetooth chip U2 is ATS2833, and the model of the power amplifier chip U4 is CS83711.
[0006] As an improvement, the other end of the resistor R25 is respectively connected to one end of the resistor R27 and one end of the capacitor C45, the other end of the resistor R27 is connected to the other end of the capacitor C45 and grounded, the other end of the resistor R27 is connected to the 5th pin of the power amplifier chip U4 through the resistor R33, the other end of the resistor R27 is connected to the 10th pin of the power amplifier chip U4 through the capacitor C50, the other end of the resistor R27 is connected to the 8th pin of the power amplifier chip U4 through the resistor R35, and the resistor R35 is connected in parallel with the capacitor C58.
[0007] As an improvement, the other end of the inductor L4 is connected to the 13th and 14th pins of the power amplifier chip U4, the 15th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C53, 54, and 55, and the 16th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C59, 60, and 61.
[0008] Compared with the prior art, the utility model has the following beneficial effects:
[0009] 1. A single chip integrates the amplifier and boost together to solve the problem of large distortion when the lithium battery voltage is low. There is no need to connect multiple lithium batteries in series to increase the amplifier power.
[0010] 2. A single chip has simpler circuits, occupies much less space, and has cost advantages. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a pin diagram of the Bluetooth chip U2.
[0012] Figure 2 This is a pin diagram of the power amplifier chip U4. DETAILED DESCRIPTION
[0013] The utility model will be further described below in conjunction with the accompanying drawings.
[0014] like Figure 1 , 2As shown, a power amplifier integrated startup boost circuit includes a Bluetooth chip U2 and a power amplifier chip U4. The model of the Bluetooth chip U2 is ATS2833, and the model of the power amplifier chip U4 is CS83711. The 46th pin DP of the Bluetooth chip U2 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the base of the transistor Q2 and one end of the resistor R26, the 24th pin BAT of the Bluetooth chip U2 is respectively connected to the other end of the resistor R26 and one end of the resistor R25, the other end of the resistor R25 is connected to the 6th pin CTRL of the power amplifier chip U4, the other end of the resistor R5 is respectively connected to one end of the resistor R27 and one end of the capacitor C45, the other end of the resistor R27 is connected to the other end of the capacitor C45 and grounded, the other end of the resistor R27 is connected to the 5th pin of the power amplifier chip U4 through the resistor R33, the other end of the resistor R27 is connected to the 10th pin of the power amplifier chip U4 through the capacitor C50, the other end of the resistor R27 is connected to the 8th pin of the power amplifier chip U4 through the resistor R35, and the resistor R35 is connected in parallel with the capacitor C58. The VDD foot of the lithium battery is connected to one end of the inductor L4, the other end of the inductor L4 is respectively connected to the anodes of the diode D6 and the diode D7, the cathodes of the diode D6 and the diode D7 are connected to the 15th and 24th pins of the power amplifier chip U4, the other end of the inductor L4 is connected to the 13th and 14th pins of the power amplifier chip U4, the 15th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C53, 54, 55, and the 16th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C59, 60, 61.
[0015] The principle of this utility model: When the speaker plays sound, the Bluetooth chip U2 The 46th pin of the Bluetooth chip U2 outputs a high level and controls the collector and emitter of the transistor Q3 to be turned on through the diode D5, so that the base pin voltage of the transistor Q2 is connected to the ground, so that the collector and emitter of the transistor Q2 are cut off, so that the 5th pin of the power amplifier chip U4 is not grounded and the power amplifier MUTE signal is released. The voltage of the 24th pin of the Bluetooth chip U2 is divided to the ground by resistors R25 and R27 to provide an ideal starting voltage to the 6th pin of the power amplifier chip U4, thereby triggering the internal boost control circuit of the power amplifier chip U4 to start. When the lithium battery provides the full voltage of 8.4V or the low voltage of 6.6V to the VDD pin, since the integrated boost circuit in the power amplifier has been started, the battery voltage passes through the inductor L4 and diodes D6 and D7 to make the 15th and 24th pins of the power amplifier chip U4 continue to have a boost voltage of 11V, completing a process of both a power amplifier and an integrated chip that can start the boost circuit, solving the problem of the high and low voltage drop of the lithium battery and the problem of adding a boost chip.
Claims
1. A power amplifier integrated startup boost circuit, comprising a Bluetooth chip U2 and a power amplifier chip U4, characterized in that: The 46th pin GPIO20 of the Bluetooth chip U2 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is respectively connected to the base of the transistor Q2 and one end of the resistor R26, the 24th pin BAT of the Bluetooth chip U2 is respectively connected to the other end of the resistor R26 and one end of the resistor R25, the other end of the resistor R25 is connected to the 6th pin CTRL of the power amplifier chip U4, the lithium battery VDD pin is connected to one end of the inductor L4, the other end of the inductor L4 is respectively connected to the anodes of the diode D6 and the diode D7, and the cathodes of the diode D6 and the diode D7 are both connected to the 15th pin and the 24th pin of the power amplifier chip U4.
2. The power amplifier integrated startup boost circuit according to claim 1, characterized in that: The model of the Bluetooth chip U2 is ATS2833, and the model of the power amplifier chip U4 is CS83711.
3. The power amplifier integrated startup boost circuit according to claim 1, characterized in that: The other end of the resistor R25 is connected to one end of the resistor R27 and one end of the capacitor C45 respectively, the other end of the resistor R27 is connected to the other end of the capacitor C45 and is grounded, the other end of the resistor R27 is connected to the 5th pin of the power amplifier chip U4 through the resistor R33, the other end of the resistor R27 is connected to the 10th pin of the power amplifier chip U4 through the capacitor C50, the other end of the resistor R27 is connected to the 8th pin of the power amplifier chip U4 through the resistor R35, and the resistor R35 is connected in parallel with the capacitor C58.
4. The power amplifier integrated startup boost circuit according to claim 1, characterized in that: The other end of the inductor L4 is connected to the 13th and 14th pins of the power amplifier chip U4, the 15th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C53, 54, 55, and the 16th pin of the power amplifier chip U4 is connected to the grounded and parallel capacitors C59, 60, 61.