Power management circuit with wide working voltage range

Abstract

The invention relates to the technical field of power management integrated circuits, and provides a power management circuit with a wide working voltage range, which comprises a high-voltage starting circuit, a low-voltage core reference generation circuit, a cross-group amplifier and a linear voltage stabilizing circuit, when the high-voltage power supply is powered on, the high-voltage starting circuit starts to work, the current of the high-voltage starting circuit flows into the low-voltage core reference generation circuit to complete the injection of the starting current, and the input power supply of the low-voltage core reference generation circuit is a linear voltage-stabilized power supply generated by the cross-group amplifier and the linear voltage-stabilized circuit. The input current of the low-voltage core reference generation circuit comes from the output of the cross-group amplifier and the linear voltage stabilizing circuit; the voltage of the low-voltage core reference generation circuit is output to the cross-group amplifier and the linear voltage stabilizing circuit, a feedback system is formed between the low-voltage core reference generation circuit through the cross-group amplifier and the linear voltage stabilizing circuit, and stable work of the system is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power management integrated circuits, and in particular to a power management circuit with a wide operating voltage range. Background Art

[0002] In recent years, power management circuits have become an important branch of analog integration, and power drive circuits are increasingly widely used. Chips such as motor drive and LED drive face system requirements for wide operating voltage, high efficiency, and low cost. In order to meet the system requirements for wide operating input voltage, traditional motor drive and LED drive power management circuits use power management circuits that integrate reference voltage and reference current in the driver chip; however, in order to meet the requirements for a wider operating voltage, this power management circuit uses a high-voltage bandgap reference generation circuit and a closed-loop linear voltage regulator generation circuit, but there are problems such as low reference voltage power supply rejection ratio, high power consumption, and complex structure. Summary of the invention

[0003] Aiming at the system requirements of wide input voltage range, reference voltage and reference current with high power supply rejection ratio, multiple reference voltage sources and low-voltage linear regulated power supply in motor and LED driving, the present invention proposes a simple circuit architecture based on high-voltage starting circuit, low-voltage reference generation core circuit, transimpedance amplifier and linear voltage regulated circuit, which realizes the system requirements, can greatly expand the application scope of motor and LED driving chips, and reduce system power consumption and save system cost.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a power management circuit with a wide operating voltage range, comprising:

[0006] A high voltage startup circuit, used to generate a startup signal for the low voltage core reference generation circuit to start working;

[0007] A low voltage core reference generation circuit is used to generate a reference voltage source and a reference current source with a high power supply rejection ratio; it includes a reference voltage branch;

[0008] The cross-group amplifier and the linear voltage regulator circuit are used to generate the cross-group amplifier and a linear voltage regulator power supply. The cross-group amplifier constitutes a feedback control loop of the low-voltage core reference generation circuit to ensure the normal operation of the circuit;

[0009] When the high-voltage power supply voltage is powered on, the high-voltage startup circuit starts working, and the current of the high-voltage startup circuit flows into the low-voltage core reference generating circuit to complete the injection of the startup current. The input power of the low-voltage core reference generating circuit is a linear voltage-regulated power supply generated by a cross-group amplifier and a linear voltage-regulating circuit, and the input current of the low-voltage core reference generating circuit comes from the output of the cross-group amplifier and the linear voltage-regulating circuit; the voltage of the low-voltage core reference generating circuit is output to the cross-group amplifier and the linear voltage-regulating circuit, and a feedback system is formed between the low-voltage core reference generating circuit through the cross-group amplifier and the linear voltage-regulating circuit to achieve stable operation of the system.

[0010] Furthermore, the high-voltage startup circuit includes a first PMOS tube, a second PMOS tube, a first NMOS tube, a first resistor and a second resistor. The first resistor is connected in series with the first PMOS tube, the second PMOS tube, the first NMOS tube and the second resistor in sequence. When the high-voltage power supply is powered on, the circuit branch generates a reference current source that changes very little with the power supply voltage.

[0011] Furthermore, the high-voltage starting circuit also includes a third PMOS tube, a fourth PMOS tube, a third resistor, a first triode, a second triode and a third triode; the first PMOS tube / the second PMOS tube and the third PMOS tube / the fourth PMOS tube form a current mirror; the drain of the fourth PMOS tube is connected to the collector of the second triode, and the emitter of the second triode is connected to the collector and base of the first triode; the base of the emitter of the second triode is connected to the base of the third triode, and the collector of the third triode is connected to the third resistor.

[0012] Furthermore, when the reference current source generates the base voltage of the third transistor through the first transistor and the second transistor, when the third transistor is turned on, the collector of the third transistor is connected to the first resistance end of the high voltage input through the third resistor, and the emitter input current of the third transistor flows into the low voltage core reference generation circuit to complete the injection of the startup current.

[0013] Furthermore, the low-voltage core reference generating circuit includes a reference voltage branch, the reference voltage branch includes a fourth triode, a fifth triode, a fourth resistor and a fifth resistor, the fourth triode and the fifth triode generate a bandgap reference voltage; the base of the fourth triode is connected to the emitter of the third triode, the emitter of the fourth triode is connected to one end of the fourth resistor, the base of the fifth triode is connected to the base of the fourth triode, the emitter of the fifth triode is connected to the other end of the fourth resistor, and one end of the fifth resistor is connected to the emitter of the fifth triode.

[0014] Furthermore, the low-voltage core reference generation circuit also includes a reference current current mirror branch, which includes a fifth PMOS tube, a sixth PMOS tube and a seventh PMOS tube; the gates of the fifth PMOS tube, the sixth PMOS tube and the seventh PMOS tube are all connected to the collector of the fourth transistor, and the drain of the sixth PMOS tube is connected to the collector of the fifth transistor.

[0015] Furthermore, the low-voltage core reference generating circuit also includes a resistor voltage divider branch, which includes at least three sixth resistors, the sixth resistors are connected to the base of the fifth transistor, and a desired reference voltage source signal is generated between every two sixth resistors.

[0016] Further, the cross-group amplifier and the linear voltage stabilization circuit include a transimpedance amplifier, and the transimpedance amplifier includes an eighth PMOS tube, a second NMOS tube, a third NMOS tube, a fourth NMOS tube, a ninth PMOS tube, a tenth PMOS tube, an eleventh PMOS tube and a seventh resistor; the ninth PMOS tube / the tenth PMOS tube / the eleventh PMOS tube form a current mirror to generate a high-voltage reference current source output, and the transimpedance amplifier generates a stable reference voltage signal at the gate of the third NMOS tube / the fourth NMOS tube;

[0017] The gate of the eighth PMOS tube serves as the input end of the transimpedance amplifier, and one end of the seventh resistor serves as the output end of the transimpedance amplifier.

[0018] Furthermore, the cross-group amplifier and linear voltage regulation circuit also include a linear voltage regulation branch, which includes a fifth NMOS tube, a sixth NMOS tube, a seventh NMOS tube and a third capacitor; the sixth NMOS tube, the seventh NMOS tube and the second NMOS tube constitute a current mirror circuit, and a reference current signal is generated through the seventh NMOS tube.

[0019] The present invention has the following beneficial effects:

[0020] The present invention is based on a simple circuit architecture of a high-voltage starting circuit, a low-voltage reference generating core circuit, a transimpedance amplifier and a linear voltage regulator circuit. When the high-voltage power supply voltage is powered on, the high-voltage starting circuit starts to work, and the current of the high-voltage starting circuit flows into the low-voltage core reference generating circuit to complete the injection of the starting current. The input power supply of the low-voltage core reference generating circuit is a linear voltage-regulated power supply generated by a cross-group amplifier and a linear voltage regulator circuit, and the input current of the low-voltage core reference generating circuit comes from the output of the cross-group amplifier and the linear voltage regulator circuit; the voltage of the low-voltage core reference generating circuit is output to the cross-group amplifier and the linear voltage regulator circuit, and a feedback system is formed between the low-voltage core reference generating circuit through the cross-group amplifier and the linear voltage regulator circuit to achieve stable operation of the system; the system requirements are met, the application range of motor and LED driver chips can be greatly expanded, the wide operating voltage in the motor and LED driver chips can be met, and the system power consumption can be reduced and the system cost can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of Example 1.

[0022] Figure 2 It is the overall circuit principle diagram of the present invention.

[0023] Figure 3 It is the schematic diagram of the high voltage starting circuit in Example 2.

[0024] Figure 4 This is a schematic diagram of the low voltage core reference generation circuit in Example 3.

[0025] Figure 5 It is a schematic diagram of the cross-group amplifier and linear voltage regulator circuit in Example 4. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be pointed out that the embodiments are only specific explanations of the invention and should not be regarded as limitations of the invention. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solutions of the present invention. The protection scope of the present invention shall still be based on the scope defined by the claims.

[0027] Example 1

[0028] like Figure 1-2 As shown, this embodiment provides a power management circuit with a wide operating voltage range, including:

[0029] A high voltage start-up circuit 1, used to generate a start-up signal for the low voltage core reference generation circuit to start working;

[0030] A low voltage core reference generation circuit 2, used for generating a reference voltage source and a reference current source with a high power supply rejection ratio; comprising a reference voltage branch;

[0031] The cross-group amplifier and linear voltage regulator circuit 3 is used to generate a cross-group amplifier and a linear voltage regulator power supply. The cross-group amplifier constitutes a feedback control loop of the low-voltage core reference generation circuit to ensure the normal operation of the circuit;

[0032] When the high-voltage power supply voltage is powered on, the high-voltage startup circuit starts working, and the current of the high-voltage startup circuit flows into the low-voltage core reference generating circuit to complete the injection of the startup current. The input power of the low-voltage core reference generating circuit is a linear voltage-regulated power supply generated by a cross-group amplifier and a linear voltage-regulating circuit, and the input current of the low-voltage core reference generating circuit comes from the output of the cross-group amplifier and the linear voltage-regulating circuit; the voltage of the low-voltage core reference generating circuit is output to the cross-group amplifier and the linear voltage-regulating circuit, and a feedback system is formed between the low-voltage core reference generating circuit through the cross-group amplifier and the linear voltage-regulating circuit to achieve stable operation of the system.

[0033] Example 2

[0034] like Figure 3 As shown, this embodiment provides a high-voltage startup circuit 1, which includes a first PMOS transistor HP1, a second PMOS transistor HP2, a first NMOS transistor HN1, a first resistor HR1 and a second resistor R1. The first resistor HR1 is connected in series with the first PMOS transistor HP1, the second PMOS transistor HP2, the first NMOS transistor HN1 and the second resistor R1 in sequence. At this time, the first NMOS transistor HN1 is in an on state. Specifically, one end of the second resistor R1 is connected to the high-voltage power supply, and the other end of the second resistor R1 is connected to the source of the first PMOS transistor HP1. The drain and gate of the first PMOS transistor HP1 are connected to the source of the second PMOS transistor HP2. The drain and gate of the second PMOS transistor HP2 are connected to the drain of the first NMOS transistor HN1. The source of the first NMOS transistor HN1 is connected to one end of the second resistor R1, and the other end of the second resistor R1 is grounded. The gate of the first NMOS transistor HN1 is also grounded. When the high-voltage power supply is powered on, the circuit branch generates a reference current source that varies very little with the power supply voltage.

[0035] The high-voltage startup circuit also includes a third PMOS tube HP3, a fourth PMOS tube HP4, a third resistor HR2, a first transistor Q1, a second transistor Q2 and a third transistor Q3; the first PMOS tube HP1 / the second PMOS tube HP2 and the third PMOS tube HP3 / the fourth PMOS tube HP4 form a current mirror; specifically, the drain and the gate of the first PMOS tube HP1 are connected to the gate of the third PMOS tube HP3, and the drain and the gate of the second PMOS tube HP2 are connected to the gate of the fourth PMOS tube HP4. The drain of the third PMOS tube HP3 is connected to the source of the fourth PMOS tube HP4, and the source of the third PMOS tube HP3 is connected to the end of the first resistor HR1 of the high voltage input; the drain of the fourth PMOS tube HP4 is connected to the collector of the second triode Q2, the emitter of the second triode Q2 is connected to the collector and base of the first triode Q1, and the emitter of the first triode Q1 is grounded; the base of the emitter of the second triode Q2 is connected to the base of the third triode Q3, and the collector of the third triode Q3 is connected to the third resistor HR2.

[0036] When the reference current source generates the base voltage of the third triode Q3 through the first triode Q1 and the second triode Q2 connected to the third PMOS tube HP3 and the fourth PMOS tube HP4, the third triode Q3 is turned on, the collector of the third triode Q3 is connected to the first resistor HR1 end of the high voltage input through the third resistor HR2, and the emitter input current of the third triode Q3 flows into the low voltage core reference generation circuit to complete the injection of the startup current.

[0037] The first resistor HR1 is a current limiting resistor, and the third resistor HR2 is a high-voltage current limiting resistor.

[0038] When the reference voltage startup is completed, the emitter voltage of Q3 is higher than the base voltage, and the startup circuit branch current is turned off.

[0039] The first NMOS transistor HN1 is a high-voltage depletion type first NMOS transistor.

[0040] Example 3

[0041] like Figure 4 As shown, this embodiment provides a low-voltage core reference generation circuit 2, wherein the low-voltage core reference generation circuit includes a reference voltage branch, a reference current mirror branch, and a resistor voltage divider branch;

[0042] The reference voltage branch includes a third triode Q3, a fourth triode Q4, a fourth resistor R2 and a fifth resistor R3, and the third triode Q3 and the fourth triode Q4 generate a bandgap reference voltage; the base of the fourth triode Q4 is connected to the emitter of the third triode Q3, the emitter of the fourth triode Q4 is connected to one end of the fourth resistor R2, the base of the fifth triode Q5 is connected to the base of the fourth triode Q4, the emitter of the fifth triode Q5 is connected to the other end of the fourth resistor R2, one end of the fifth resistor R3 is connected to the emitter of the fifth triode Q5, and the other end of the fifth resistor R3 is grounded; the base of the fifth triode Q5 is also connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded;

[0043] The reference current current mirror branch includes a fifth PMOS tube M1, a sixth PMOS tube M3 and a seventh PMOS tube M1, the gates of the fifth PMOS tube M1, the sixth PMOS tube M3 and the seventh PMOS tube M1 are all connected to the collector of the fourth triode Q4, and the drain of the sixth PMOS tube M3 is connected to the collector of the fifth triode Q5; the sources of the fifth PMOS tube M1, the sixth PMOS tube M3 and the seventh PMOS tube M1 are all connected to the cross-group amplifier and the linear voltage stabilization circuit, the drain of the sixth PMOS tube M3 is also connected to one end of the second capacitor C0, and the other end of the second capacitor C0 is grounded;

[0044] The resistor voltage divider branch includes at least three sixth resistors, which are connected to the base of the fifth transistor Q5. A desired reference voltage source signal is generated between every two sixth resistors. Figure 4 As shown, the sixth resistor is provided with 9 resistors, namely resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10 and resistor R11, and the desired reference voltage source signals generated are VR1, VR2, VR3, VR4, VR5, VR6, VR7 and VR8 respectively.

[0045] Example 4

[0046] like Figure 5 As shown, this embodiment provides a cross-group amplifier and a linear voltage regulator circuit 3, the cross-group amplifier and the linear voltage regulator circuit comprises a transimpedance amplifier and a linear voltage regulator branch;

[0047] The transimpedance amplifier comprises an eighth PMOS tube M4, a second NMOS tube M5, a third NMOS tube NH2, a fourth NMOS tube NH3, a ninth PMOS tube HP7, a tenth PMOS tube HP5, an eleventh PMOS tube HP6 and a seventh resistor R0; the ninth PMOS tube HP7 / the tenth PMOS tube HP5 / the eleventh PMOS tube HP6 form a current mirror to generate a high-voltage reference current source output, and the transimpedance amplifier generates a stable reference voltage signal at the gate of the third NMOS tube NH2 / the fourth NMOS tube NH3; specifically, the gate of the eighth PMOS tube M4 is connected to the drain of the sixth PMOS tube M3, the drain of the eighth PMOS tube M4 is connected to the gate and drain of the second NMOS tube M5, and the source of the second NMOS tube M5 is connected to the drain of the eighth PMOS tube M4. grounded; the source of the eighth PMOS tube M4 is connected to the source of the third NMOS tube NH2, the drain of the third NMOS tube NH2 is connected to the drain of the tenth PMOS tube HP5, and the drain and gate of the third NMOS tube NH2 are also connected to the gate of the fourth NMOS tube NH3; the source of the fourth NMOS tube NH3 is connected to one end of the seventh resistor R0, the other end of the seventh resistor R0 is connected to the base of the fifth transistor Q5, the drain of the fourth NMOS tube NH3 is connected to the source of the ninth PMOS tube HP7, the source of the tenth PMOS tube HP5, and the source and drain of the eleventh PMOS tube HP6; the sources of the ninth PMOS tube HP7, the tenth PMOS tube HP5, and the eleventh PMOS tube HP6 are all connected to the first resistor HR1 end of the high voltage input;

[0048] The eighth PMOS transistor M4 and the second NMOS transistor M5 are low-voltage devices; the third NMOS transistor NH2, the fourth NMOS transistor NH3, the ninth PMOS transistor HP7, the tenth PMOS transistor HP5 and the eleventh PMOS transistor HP6 are high-voltage devices.

[0049] The gate of the eighth PMOS tube M4 is used as the input end of the transimpedance amplifier, and one end of the seventh resistor R0 is used as the output end of the transimpedance amplifier;

[0050] The linear voltage stabilization branch includes a fifth NMOS transistor NH4, a sixth NMOS transistor M6, a seventh NMOS transistor M7 and a third capacitor C2; the sixth NMOS transistor M6, the seventh NMOS transistor NH7 and the second NMOS transistor M5 form a current mirror circuit, specifically, the gate and the drain of the second NMOS transistor M5 are connected to the gates of the sixth NMOS transistor M6 and the seventh NMOS transistor M7, the drain of the sixth NMOS transistor M6 is connected to the source of the fifth NMOS transistor NH4, the source of the sixth NMOS transistor M6 is grounded, the source of the seventh NMOS transistor M7 is grounded, and a reference current signal is generated through the drain of the seventh NMOS transistor M7;

[0051] The gate of the fifth NMOS transistor NH4 is connected to the gate of the third NMOS transistor NH2 / the fourth NMOS transistor NH3, and the drain of the fifth NMOS transistor NH4 is connected to the end of the first resistor HR1 of the high voltage input; the source of the fifth NMOS transistor NH4 is connected to the source of the fifth PMOS transistor M1, and the source of the fifth NMOS transistor NH4 is also connected to one end of the third capacitor C2, and the other end of the third capacitor C2 is grounded;

[0052] The sixth NMOS transistor M6 is used as a static load of the linear voltage stabilization branch, and the third capacitor C2 is used for voltage stabilization filtering of the linear voltage stabilization branch.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0054] It should be noted that the technical features not described in detail in the present invention can be implemented by any existing technology.

Claims

1. A power management circuit with a wide operating voltage range, characterized in that: include: A high voltage startup circuit, used to generate a startup signal for the low voltage core reference generation circuit to start working; A low voltage core reference generation circuit for generating a reference voltage source and a reference current source with a high power supply rejection ratio; including a reference voltage branch; The cross-group amplifier and the linear voltage regulator circuit are used to generate the cross-group amplifier and a linear voltage regulator power supply. The cross-group amplifier constitutes a feedback control loop of the low-voltage core reference generation circuit to ensure the normal operation of the circuit; When the high-voltage power supply voltage is powered on, the high-voltage startup circuit starts working, and the current of the high-voltage startup circuit flows into the low-voltage core reference generating circuit to complete the injection of the startup current. The input power of the low-voltage core reference generating circuit is a linear voltage-regulated power supply generated by a cross-group amplifier and a linear voltage-regulating circuit, and the input current of the low-voltage core reference generating circuit comes from the output of the cross-group amplifier and the linear voltage-regulating circuit; the voltage of the low-voltage core reference generating circuit is output to the cross-group amplifier and the linear voltage-regulating circuit, and a feedback system is formed between the low-voltage core reference generating circuit through the cross-group amplifier and the linear voltage-regulating circuit to achieve stable operation of the system.

2. A power management circuit with a wide operating voltage range according to claim 1, characterized in that: The high-voltage startup circuit includes a first PMOS tube, a second PMOS tube, a first NMOS tube, a first resistor and a second resistor. The first resistor is connected in series with the first PMOS tube, the second PMOS tube, the first NMOS tube and the second resistor in sequence. When the high-voltage power supply is powered on, the circuit branch generates a reference current source that changes very little with the power supply voltage.

3. The power management circuit with a wide operating voltage range according to claim 2, characterized in that: The high-voltage startup circuit also includes a third PMOS tube, a fourth PMOS tube, a third resistor, a first triode, a second triode and a third triode; the first PMOS tube / the second PMOS tube and the third PMOS tube / the fourth PMOS tube form a current mirror; the drain of the fourth PMOS tube is connected to the collector of the second triode, and the emitter of the second triode is connected to the collector and base of the first triode; the base of the emitter of the second triode is connected to the base of the third triode, and the collector of the third triode is connected to the third resistor.

4. The power management circuit with a wide operating voltage range according to claim 3, characterized in that: When the reference current source generates the base voltage of the third transistor through the first transistor and the second transistor, when the third transistor is turned on, the collector of the third transistor is connected to the first resistance end of the high-voltage input through the third resistor, and the emitter input current of the third transistor flows into the low-voltage core reference generation circuit to complete the injection of the startup current.

5. The power management circuit with a wide operating voltage range according to claim 1, characterized in that: The low-voltage core reference generation circuit comprises a reference voltage branch, and the reference voltage branch comprises a fourth transistor and a fifth transistor, and the fourth transistor and the fifth transistor generate a bandgap reference voltage.

6. The power management circuit with a wide operating voltage range according to claim 5, characterized in that: The low voltage core reference generation circuit further includes a reference current current mirror branch, and the reference current current mirror branch includes a fifth PMOS tube, a sixth PMOS tube and a seventh PMOS tube; The gates of the fifth PMOS tube, the sixth PMOS tube and the seventh PMOS tube are all connected to the collector of the fourth transistor, and the drain of the sixth PMOS tube is connected to the collector of the fifth transistor.

7. The power management circuit with a wide operating voltage range according to claim 5, characterized in that: The low-voltage core reference generation circuit also includes a resistor voltage divider branch, which includes at least three sixth resistors, the sixth resistors are connected to the base of the fifth transistor, and a desired reference voltage source signal is generated between every two sixth resistors.

8. The power management circuit with a wide operating voltage range according to claim 1, characterized in that: The cross-group amplifier and linear voltage stabilization circuit include a transimpedance amplifier, which includes an eighth PMOS tube, a second NMOS tube, a third NMOS tube, a fourth NMOS tube, a ninth PMOS tube, a tenth PMOS tube, an eleventh PMOS tube and a seventh resistor; the ninth PMOS tube / the tenth PMOS tube / the eleventh PMOS tube form a current mirror to generate a high-voltage reference current source output, and the transimpedance amplifier generates a stable reference voltage signal at the gate of the third NMOS tube / the fourth NMOS tube; The gate of the eighth PMOS tube serves as the input end of the transimpedance amplifier, and one end of the seventh resistor serves as the output end of the transimpedance amplifier.

9. The power management circuit with a wide operating voltage range according to claim 1, characterized in that: The cross-group amplifier and linear voltage regulator circuit also include a linear voltage regulator branch, which includes a fifth NMOS tube, a sixth NMOS tube, a seventh NMOS tube and a third capacitor; the sixth NMOS tube, the seventh NMOS tube and the second NMOS tube constitute a current mirror circuit, and a reference current signal is generated through the seventh NMOS tube.

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