CN101552552B - Dynamic Feedback Regulated Charge Pump Device - Google Patents

Abstract

A dynamic feedback voltage-stabilized charge pump device. The dynamic feedback voltage-stabilized charge pump device receives an input voltage through a voltage regulator, and the voltage regulator adjusts the input voltage to a basic voltage according to a control signal. The charge pump receives the basic voltage and multiplies the basic voltage as an output voltage. The feedback unit provides a voltage regulator control signal according to the output voltage. Thus, the dynamic feedback voltage-stabilized charge pump device can reduce output voltage ripple and improve the output efficiency of the charge pump.

Description

Dynamic Feedback Regulated Charge Pump Device

technical field

The present invention relates to a charge pumping device, and in particular to a charge pumping device with dynamic feedback voltage regulation capability. the

Background technique

In electronic circuits, various power supply voltages of different levels are often required for use in the circuit, so a charge pump circuit is often configured to use the existing power supply voltage to generate various power supply voltages of different levels. The charge pumping circuit increases (or decreases) its input voltage level by a predetermined ratio to generate voltages of different levels. Therefore, the output voltage level of the charge pump circuit is closely related to its input voltage. However, in order that the charge pumping circuit can be applied in various environments (that is, the input voltage may not be determined when designing the charge pumping circuit), and can still generate the same expected output voltage, generally the voltage adjustment circuit is used to first adjust the output The voltage level is adjusted to the rated voltage, and then the rated output voltage is generated by the charge pump. the

Fig. 1 is a known charge pump circuit diagram. The capacitor C, the switch 102 , the switch 103 , the switch 104 and the switch 105 form a charge pump. The transistor T1, the operational amplifier 101, the resistor R1, and the resistor R2 constitute a voltage adjustment circuit with negative feedback. The voltage adjustment circuit receives the system voltage V _CC and adjusts the system voltage V _CC to the input voltage V _in1 . During the first working cycle of the charge pump, the switches 102 and 105 will be short-circuited, and the switches 103 and 104 will be open-circuited. At this time, the input voltage V _in1 will charge the capacitor C, so that the capacitor C has a voltage equal to the input voltage V _in1 . potential. During the second working cycle of the charge pump, the switches 103 and 104 will be short-circuited, and the switches 102 and 105 will be open-circuited, so that one end of the capacitor C is changed from being grounded to being connected to the input voltage V _in1 (that is, from 0V to V _in1 ), at this time the potential of the other end of the capacitor C will be raised from V _in1 to 2V _in1 . Therefore, the output voltage V _out1 will have twice the voltage of the input voltage V _in1 .

It is known that although the charge pump can provide a voltage twice the input voltage V _in1 , when the output of the charge pump has a current change due to a load change, the voltage adjustment circuit cannot detect and adjust for the change in the output current in real time. The input voltage V _in1 , so that the output voltage V _out1 will produce severe ripples with the change of the load current. To solve the ripple problem, generally, the input terminal of the charge pump is directly coupled to the system voltage, and then the output terminal is coupled to a voltage regulator with a stabilizing capacitor. However, this solution will cause the problem that the voltage regulator directly faces the load, and the added voltage stabilizing capacitor will also increase the cost burden, and jointly prevent the original function of the charge pump from being fully utilized.

Contents of the invention

The present invention provides a dynamic feedback stabilized charge pump device, which uses a feedback unit to dynamically detect and feed back the output voltage of the charge pump, and reduces the output voltage ripple and improves the output of the charge pump without adding additional components and costs. The efficacy of efficiency. the

The invention provides a charge pumping device, which includes a voltage regulator, a charge pump and a feedback unit. The input terminal of the voltage regulator receives the input voltage, and adjusts the input voltage to output a basic voltage according to the control signal. The charge pump is coupled to the output terminal of the voltage regulator to receive the basic voltage, and then doubles the basic voltage to obtain an output voltage. The input terminal of the feedback unit is coupled to the output terminal of the charge pump to receive the output voltage, and the output terminal of the feedback unit is coupled to the voltage regulator to provide a control signal, wherein the control signal is related to the output voltage. the

The above-mentioned voltage regulator includes an operational amplifier, a transistor and a switch. The first terminal of the operational amplifier is coupled to the output terminal of the feedback unit to receive the control signal, and the second terminal of the operational amplifier receives the reference voltage. The gate of the transistor is coupled to the output terminal of the operational amplifier, the first source and drain of the transistor receive the input voltage, and the second source and drain of the transistor output the basic voltage. The first terminal of the switch receives the input voltage, and the second terminal of the switch is coupled to the output terminal of the operational amplifier. the

In an embodiment of the present invention, the feedback unit includes a first resistor and a second resistor, the first end of the first resistor serves as the input end of the feedback unit to receive the output voltage, and the second end of the first resistor serves as the input end of the feedback unit. Output terminal to provide a control signal to the voltage regulator. The first terminal of the second resistor is coupled to the second terminal of the first resistor, and the second terminal of the second resistor is grounded. the

The present invention provides a dynamic feedback voltage stabilizing charge pump device, which combines the effect of charge pumping voltage doubling and the voltage stabilizing characteristics of the voltage regulator with the ability of real-time detection and feedback of the feedback unit to dynamically detect and feedback the output voltage to real-time It responds to the current change caused by its load, and can improve the output efficiency of the charge pump and reduce the ripple of the output voltage without adding additional components and costs. the

In order to make the above-mentioned features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings. the

Description of drawings

Fig. 1 is a known charge pump circuit diagram. the

FIG. 2 is a schematic diagram of a charge pump device for dynamic feedback regulation according to an embodiment of the present invention. the

FIG. 3A is a circuit diagram of a dynamic feedback regulator charge pump device according to a first embodiment of an embodiment of the present invention. the

FIG. 3B is a diagram illustrating the phase waveform of FIG. 3A according to an embodiment of the present invention. the

FIG. 4 is a circuit diagram of a dynamic feedback regulator charge pump device according to a second embodiment of an embodiment of the present invention. the

FIG. 5 is a circuit diagram of a dynamic feedback regulator charge pump device according to a third embodiment of an embodiment of the present invention. the

FIG. 6 is a circuit diagram of a dynamic feedback regulator charge pump device according to a fourth embodiment of an embodiment of the present invention. the

FIG. 7 is a circuit diagram of a dynamic feedback regulator charge pump device according to a fifth embodiment of an embodiment of the present invention. the

FIG. 8 is a circuit diagram of a dynamic feedback regulator charge pump device according to a sixth embodiment of an embodiment of the present invention. the

[Description of main component labels]

200, 300, 400, 500, 600, 700, 800: Dynamic feedback regulated charge pump device

201: Voltage regulator

202: Charge pumping

203: Feedback unit

101. OP1: Operational Amplifier

T1, Tr1: Transistor

V _CL , PH1, PH2: control signals

V _in1 : input voltage

V _BASE : base voltage

V _CC , V _DD : System voltage

V _OUT1 , V _OUT2 : output voltage

V _REF1 , V _REF2 : Reference voltage

102, 103, 104, 105, SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19: switch

R1, R2, R3, R4: Resistors

C, C1, C2, C3, C4, C5, C _OUT2 : capacitance

Detailed ways

Because the known charge pump cannot respond to the change of the output terminal in real time. When a current change occurs at the output terminal due to a load change, the output voltage generated by the known charge pump will have a severe ripple problem with the current change. In view of this, the following embodiments of the present invention utilize the capability of real-time detection and feedback of the feedback unit to improve the output efficiency of the charge pump and reduce the ripple effect of the output voltage. the

FIG. 2 is a schematic diagram of a dynamic feedback regulator charge pump device 200 according to an embodiment of the present invention. Referring to FIG. 2 , the dynamic feedback regulated charge pump device 200 includes a voltage regulator (voltage regulator) 201 , a charge pump (charge pump) 202 and a feedback unit (feedback unit) 203 . The voltage regulator 201 is coupled to the charge pump 202 and the feedback unit 203 . The charge pump 202 is coupled to the feedback unit 203 . The input terminal of the voltage regulator 201 receives an input voltage (the system voltage V _DD is taken as an example in this embodiment), and adjusts and outputs the system voltage V _DD to a basic voltage V _BASE according to the control signal V _CL . The input terminal of the charge pump 202 receives the basic voltage V _BASE , and then doubles the basic voltage V _BASE to obtain the output voltage V _OUT2 . The input terminal of the feedback unit 203 receives the output voltage V _OUT2 , and the feedback unit 203 provides the control signal V _CL to the voltage regulator 201 according to the output voltage V _OUT2 . Therefore, the present embodiment of the present invention can dynamically detect and feed back the output voltage V _OUT2 to achieve the purpose of quickly responding to the change of the load current, thereby improving the output efficiency of the charge pump and reducing the ripple of the output voltage.

Various implementations of the above-mentioned one embodiment will be described with the following embodiments. FIG. 3A is a circuit diagram of a dynamic feedback regulator charge pump device 300 according to a first implementation of an embodiment of the present invention. The voltage regulator 201 includes an operational amplifier OP1 and a transistor Tr1. The first end of the operational amplifier (operation amplifier) OP1 (in this embodiment, the non-inverting input end is used as an example) is coupled to the output end of the feedback unit (that is, the second end of the resistor R3), and its second end (in this embodiment, the The inverting input terminal (for example) receives the reference voltage V _REF2 , and its output terminal is coupled to the gate of the transistor Tr1. The first source and drain of the transistor Tr1 (the source is used as an example in this embodiment) receives the system voltage V _DD , and the second source and drain (the drain is used as an example in this embodiment) is the output terminal of the voltage regulator 201 and is coupled to the switch The first terminals of SW2 and SW3 output the basic voltage V _BASE . In this implementation manner, the PMOS transistor is an implementation manner of the transistor Tr1, which is not intended to limit the present invention.

The charge pump 202 includes a first capacitor C1 , a second switch SW2 , a third switch SW3 , a fourth switch SW4 , a fifth switch SW5 and an output capacitor C _OUT2 . The second end of the switch SW2 is coupled to the first end of the capacitor C1. The second terminal of the switch SW3 is coupled to the second terminal of the capacitor C1. The first end of the switch SW4 is coupled to the first end of the capacitor C1 , and the second end of the switch SW4 is the output end of the charge pump 202 to provide the output voltage V _OUT2 . The first end of the switch SW5 is coupled to the second end of the capacitor C1, and the second end of the switch SW5 receives the second reference voltage (the ground voltage is taken as an example in this embodiment). The first end of the output capacitor C _OUT2 is coupled to the second end of the switch SW4 , and the second end thereof is coupled to the ground voltage. Those skilled in the art can omit the output capacitor C _OUT2 as needed.

The feedback unit 203 includes a first resistor R3 and a second resistor R4. A first terminal of the resistor R3 is coupled to a second terminal of the switch SW4. A first end of the resistor R4 is coupled to a second end of the resistor R3, and a second end of the resistor R4 is grounded. the

FIG. 3B is a diagram illustrating the phase waveform of FIG. 3A according to an embodiment of the present invention. Please refer to FIG. 3A and FIG. 3B at the same time. PH1 and PH2 in FIG. 3B are respectively compared with the control signals PH1 and PH2 in FIG. 3A . When the transistor Tr1 receives the system voltage V _DD , it adjusts the system voltage V _DD to the base voltage V _BASE according to the control of the operational amplifier OP1 and then transmits it to the first ends of the switches SW2 and SW3 . When the control signal PH1 is at a high potential (the control signal PH2 is at a low potential at this time), the switches SW2 and SW5 are short-circuited, and the switches SW3 and SW4 are open-circuited. Therefore, the basic voltage V _BASE charges the capacitor C1 , so that the potential stored in the capacitor C1 is roughly equal to the potential of the basic voltage V _BASE .

When the control signal PH2 is at a high potential (the control signal PH1 is at a low potential at this time), the switches SW3 and SW4 will be short-circuited, and the switches SW2 and SW5 will be open-circuited, so that the second terminal of the capacitor C1 is connected to the basic voltage instead of the ground. V _BASE (that is, changing from 0V to V _BASE ), at this time, the potential of the first terminal of the capacitor C1 will be raised from approximately the basic voltage V _BASE to approximately 2V _BASE . Therefore, the output voltage V _OUT2 is approximately twice the base voltage V _BASE . The output capacitor C _OUT2 makes the output voltage V _OUT2 more stable.

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the resistors R3 and R4 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output of the charge pump 202 And adjust its base voltage V _BASE . In this way, the present embodiment can output the output voltage V _OUT2 which is approximately twice the base voltage V _BASE , and achieve the functions of dynamically feedbacking the current change of the output terminal and performing voltage regulation, thereby reducing the ripple of the output voltage V _OUT2 .

FIG. 4 is a circuit diagram of a dynamic feedback regulator charge pump device 400 according to a second implementation of an embodiment of the present invention. Comparing FIG. 3A and FIG. 4 , the same functions are given the same labels, and it can be found that the differences are the switch SW1 , the switch SW2 and the capacitor C1 in the dynamic feedback voltage stabilizing charge pumping device 400 . A first terminal of the switch SW1 receives the system voltage V _DD , and a second terminal thereof is coupled to the output terminal of the operational amplifier OP1 . The first end of the switch SW2 receives the system voltage V _DD . The second end of the capacitor C1 is coupled to the drain of the transistor Tr1. Compared with FIG. 3A , the present embodiment omits the switch SW3 capable of withstanding a large current, and configures a switch SW1 with a small area.

Referring also to FIG. 3B to illustrate FIG. 4 , the control signal PH2B is the inverse of the control signal PH2 . When the control signal PH1 is at a high potential (the control signal PH2 is at a low potential, and the control signal PH2B is at a high potential), the switches SW1 , SW2 and SW5 are short-circuited, and the switch SW4 is open-circuited. A short circuit of the switch SW1 renders the transistor Tr1 non-conductive (off). During this period, the system voltage V _DD charges the capacitor C1 through the switch SW2 , so that the capacitor C1 stores a potential approximately equal to the system voltage V _DD . Since the system voltage V _DD can directly charge the capacitor C1, its charging speed will be faster. When the control signal PH2 is at a high potential (the control signals PH2B and PH1 are at a low potential at this time), the switch SW4 is short-circuited, and the switches SW1 , SW2 and SW5 are open-circuited. The transistor Tr1 is controlled by the operational amplifier OP1 to output the basic voltage V _BASE to the second terminal of the capacitor C1. Since the second terminal of the capacitor C1 is changed from the ground (ie 0V) to the basic voltage V _BASE , the potential of the first terminal of the capacitor C1 will be raised from V _DD to V _DD +V _BASE . The aforementioned V _DD +V _BASE will be output as the output voltage V _OUT2 via the switch SW4 .

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the feedback unit 203 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output terminal of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output terminal of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output terminal of the charge pump 202 And adjust the basic voltage V _BASE , and then adjust the output voltage V _OUT2 of the charge pump 202 . In this way, this embodiment can achieve the function of dynamically feedbacking the change of the output terminal and conveying its reaction to the output terminal more quickly to stabilize the voltage, thereby reducing the ripple of the output voltage V _OUT2 and improving the output efficiency.

FIG. 5 is a circuit diagram of a dynamic feedback regulator charge pump device 500 according to a third implementation of an embodiment of the present invention. The voltage regulator 201 and the feedback unit 203 are as described above in the embodiment of FIG. 3A , so details are not repeated here. The charge pump 202 includes a second capacitor C2, a third capacitor C3, a sixth switch SW6, a seventh switch SW7, an eighth switch SW8, a ninth switch SW9, a tenth switch SW10, an eleventh switch SW11, and a twelfth switch SW12 and output capacitor C _OUT2 . A first terminal of the switch SW6 is coupled to the drain of the transistor Tr1 to receive the base voltage V _BASE , and a second terminal of the switch SW6 is coupled to the first terminal of the capacitor C2 . A first terminal of the switch SW7 is coupled to the first terminal of the switch SW6, and a second terminal thereof is coupled to the second terminal of the capacitor C2. A first terminal of the switch SW8 is coupled to the first terminal of the capacitor C2, and a second terminal of the switch SW8 is coupled to the first terminal of the capacitor C3. A first terminal of the switch SW9 is coupled to a second terminal of the capacitor C2, and the second terminal of the switch SW9 receives the ground voltage. A first terminal of the switch SW10 is coupled to a first terminal of the switch SW6, and a second terminal thereof is coupled to a second terminal of the capacitor C3. The first terminal of the switch SW11 is coupled to the first terminal of the capacitor C3, and the second terminal thereof receives the ground voltage. A first end of the switch SW12 is coupled to a second end of the capacitor C3, and the second end of the switch SW12 is the output end of the charge pump 202 to provide the output voltage V _OUT2 . The first end of the output capacitor C _OUT2 is coupled to the second end of the switch SW12 , and the second end thereof is coupled to the ground voltage. Those skilled in the art can omit the output capacitor C _OUT2 as needed.

FIG. 5 is also described with reference to FIG. 3B . When the transistor Tr1 receives the system voltage V _DD , it adjusts the system voltage V _DD to the base voltage V _BASE according to the control of the operational amplifier OP1 and then transmits it to the first end of the switch SW6 . When the control signal PH1 is at a high potential (the control signal PH2 is at a low potential at this time), the switches SW6 , SW9 , SW10 and SW11 are short-circuited, and the switches SW7 , SW8 and SW12 are open-circuited. Therefore, the base voltage V _BASE charges the capacitors C2 and C3 respectively, so that the potentials stored in the capacitors C2 and C3 are approximately equal to the potential of the base voltage V _BASE . When the control signal PH2 is at a high potential (the control signal PH1 is at a low potential at this time), the switches SW7, SW8, and SW12 will be short-circuited, and the switches SW6, SW9, SW10, and SW11 will be open-circuited, so that the second end of the capacitor C2 is grounded. If it is changed to be connected to the base voltage V _BASE (ie changed from 0V to V _BASE ), the potential of the first terminal of the capacitor C2 will be raised from about the base voltage V _BASE to about 2V _BASE . At the same time, the first terminal of the capacitor C3 is changed from being grounded to the first terminal of the capacitor C2 (that is, changed from 0V to 2V _BASE ), and the potential of the second terminal of the capacitor C3 is raised from approximately the basic voltage V _BASE to approximately 3V _BASE . Therefore the output voltage V _OUT2 is approximately three times the base voltage V _BASE . The output capacitor C _OUT2 makes the output voltage V _OUT2 more stable.

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the resistors R3 and R4 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output of the charge pump 202 And adjust its base voltage V _BASE . In this way, the present embodiment can output the output voltage V _OUT2 which is about three times the base voltage V _BASE , and achieve the functions of dynamically feedbacking the current change of the output terminal and performing voltage regulation, thereby reducing the ripple of the output voltage V _OUT2 .

FIG. 6 is a circuit diagram of a dynamic feedback regulator charge pump device 600 according to a fourth implementation of an embodiment of the present invention. Comparing Fig. 5 and Fig. 6, the same function is given the same label, and it can be found that the difference is the switches SW1, SW6 and capacitor C2 in the dynamic feedback voltage stabilizing charge pumping device 600. A first terminal of the switch SW1 receives the system voltage V _DD , and a second terminal thereof is coupled to the output terminal of the operational amplifier OP1 . The first end of the switch SW6 receives the system voltage V _DD . The second end of the capacitor C2 is directly coupled to the drain of the transistor Tr1. Compared with FIG. 5 , this embodiment omits the switch SW7 capable of withstanding a large current, and configures a switch SW1 with a small area.

Referring also to FIG. 3B to illustrate FIG. 6 , the control signal PH2B is the inverse of the control signal PH2 . When the control signal PH1 is at a high potential (at this time, the control signal PH2 is at a low potential and the control signal PH2B is at a high potential), the switches SW1, SW6, SW9, SW10, and SW11 are short-circuited, and the switches SW8 and SW12 are open-circuited. The short circuit of the switch SW1 makes the transistor Tr1 non-conductive (off). During this period, the system voltage V _DD charges the capacitors C2 and C3 respectively via the switches SW6 and SW10 , so that the capacitors C2 and C3 store a potential approximately equal to the system voltage V _DD . Since the system voltage V _DD can directly charge the capacitors C2 and C3 , the charging speed will be faster. When the control signal PH2 is at a high potential (the control signals PH2B and PH1 are at a low potential), the switches SW8 and SW12 are short-circuited, and the switches SW1 , SW6 , SW9 , SW10 and SW11 are open-circuited. The transistor Tr1 is controlled by the operational amplifier OP1 to output the basic voltage V _BASE to the second terminal of the capacitor C2. Since the second terminal of the capacitor C2 is changed from the ground (ie 0V) to the basic voltage V _BASE , the potential of the first terminal of the capacitor C2 is raised from V _DD to V _DD +V _BASE . At the same time, the first terminal of C3 is changed from ground (ie 0V) to the first terminal of capacitor C2, so that the potential of the second terminal of capacitor C3 is raised from V _DD to 2V _DD +V _BASE . The above 2V _DD +V _BASE will be output as the output voltage V _OUT2 via the switch SW12 .

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the feedback unit 203 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output terminal of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output terminal of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output terminal of the charge pump 202 And adjust the basic voltage V _BASE , and then adjust the output voltage V _OUT2 of the charge pump 202 . In this way, this embodiment can achieve the function of dynamically feedbacking the change of the output terminal and conveying its reaction to the output terminal more quickly to stabilize the voltage, thereby reducing the ripple of the output voltage V _OUT2 and improving the output efficiency.

FIG. 7 is a circuit diagram of a dynamic feedback regulator charge pump device 700 according to a fifth embodiment of an embodiment of the present invention. The voltage regulator 201 and the feedback unit 203 are as described above in the embodiment of FIG. 3A , so details are not repeated here. The charge pump 202 includes a fourth capacitor C4, a fifth capacitor C5, a thirteenth switch SW13, a fourteenth switch SW14, a fifteenth switch SW15, a sixteenth switch SW16, a seventeenth switch SW17, and an eighteenth switch SW18 , the nineteenth switch SW19 and the output capacitor C _OUT2 . A first terminal of the switch SW13 is coupled to the drain of the transistor Tr1 to receive the base voltage V _BASE , and a second terminal of the switch SW13 is coupled to the first terminal of the capacitor C4 . A first terminal of the switch SW14 is coupled to the first terminal of the switch SW13, and a second terminal thereof is coupled to the second terminal of the capacitor C4. A first end of the switch SW15 is coupled to a second end of the capacitor C4, and the second end of the switch SW15 receives the ground voltage. A first terminal of the switch SW16 is coupled to the first terminal of the capacitor C4, and a second terminal of the switch SW16 is coupled to the first terminal of the capacitor C5. A first terminal of the switch SW17 is coupled to the first terminal of the switch SW13, and a second terminal thereof is coupled to the second terminal of the capacitor C5. A first end of the switch SW18 is coupled to a second end of the capacitor C5, and the second end of the switch SW18 receives the ground voltage. The first end of the switch SW19 is coupled to the first end of the capacitor C5, and the second end of the switch SW19 is the output end of the charge pump 202 to provide the output voltage V _OUT2 . The first end of the output capacitor C _OUT2 is coupled to the second end of the switch SW19 , and the second end thereof is coupled to the ground voltage. Those skilled in the art can omit the output capacitor C _OUT2 as required.

FIG. 7 is also described with reference to FIG. 3B . When the transistor Tr1 receives the system voltage V _DD , it adjusts the system voltage V _DD to the base voltage V _BASE according to the control of the operational amplifier OP1 and then transmits it to the first terminal of the switch SW13 . When the control signal PH1 is at a high potential (the control signal PH2 is at a low potential at this time), the switches SW13 , SW15 , SW17 and SW19 are short-circuited, and the switches SW14 , SW16 and SW18 are open-circuited. During this period, the basic voltage V _BASE will charge the capacitor C4, so that the potential stored in the capacitor C4 is approximately equal to the potential of the basic voltage V _BASE . At the same time, the second terminal of the capacitor C5 is changed from grounding to the basic voltage V _BASE (that is, changed from 0V to V _BASE ), and the potential of the first terminal of the capacitor C5 is changed from 2V _BASE (this voltage is when the control signal PH2 is at a high potential obtained when) is raised to 3V _BASE . Therefore the output voltage V _OUT2 is approximately three times the base voltage V _BASE . When the control signal PH2 is at a high potential, the switches SW14 , SW16 and SW18 are short-circuited, and the switches SW13 , SW15 , SW17 and SW19 are open-circuited. At this time, the second terminal of the capacitor C4 is changed from being grounded to the basic voltage V _BASE (ie, changed from 0V to V _BASE ), and the potential of the first terminal of the capacitor C4 is raised from the basic voltage V _BASE to 2V _BASE . At the same time, the first end of capacitor C5 is connected to the first end of capacitor C4, and its second end is grounded, so that the potential of the first end of capacitor C4 is 2V _BASE to charge capacitor C5, so that the potential stored in capacitor C5 is approximately equal to the potential of 2V _BASE potential. The output capacitor C _OUT2 makes the output voltage V _OUT2 more stable.

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the resistors R3 and R4 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output of the charge pump 202 And adjust its base voltage V _BASE . In this way, the present embodiment can output the output voltage V _OUT2 which is about three times the base voltage V _BASE , and achieve the functions of dynamically feedbacking the current change of the output terminal and performing voltage regulation, thereby reducing the ripple of the output voltage V _OUT2 .

FIG. 8 is a circuit diagram of a dynamic feedback regulator charge pump device 800 according to a sixth embodiment of an embodiment of the present invention. Comparing FIG. 7 and FIG. 8 , the same functions are given the same labels, and it can be found that the differences are the switches SW1 , SW13 , SW14 and the capacitor C4 in the charge pump device 800 for dynamic feedback regulation. A first end of the switch SW1 receives the system voltage V _DD , and a second end of the switch SW1 is coupled to the output end of the operational amplifier. The first end of the switch SW13 receives the system voltage V _DD . A first terminal of the switch SW14 is coupled to a first terminal of the switch SW13. The second end of the capacitor C5 is directly coupled to the drain of the transistor Tr1. Compared with FIG. 5 , the present embodiment omits the switch SW17 capable of withstanding a large current, and configures a switch SW1 with a small area.

Referring also to FIG. 3B to illustrate FIG. 8 , the control signal PH1B is the inversion of the control signal PH1 . When the control signal PH1 is at a high potential (at this time, the control signals PH2 and PH1B are at a low potential), the switches SW13 , SW15 and SW19 are short-circuited, and the switches SW1 , SW14 , SW16 and SW18 are open-circuited. The transistor Tr1 is controlled by the operational amplifier OP1 to output the basic voltage V _BASE to the second terminal of the capacitor C5. During this period, the system voltage V _DD charges the capacitor C4 through the switch SW13 , so that the capacitor C4 stores a potential approximately equal to the system voltage V _DD . The second terminal of the capacitor C5 is changed from ground to the basic voltage V _BASE (that is, changed from 0V to V _BASE ), and the potential of the first terminal of the capacitor C5 is obtained from 2V _DD (this voltage is obtained when the control signal PH2 is at a high potential. ) is raised to 2V _DD +V _BASE . The above 2V _DD +V _BASE will be output as the output voltage V _OUT2 via the switch SW12 . When the control signal PH2 is at a high potential (the control signal PH1 is at a low potential and PH1B is at a high potential), the switches SW1 , SW14 , SW16 and SW18 are short-circuited, and SW13 , SW15 and SW19 are open-circuited. The short circuit of the switch SW1 makes the transistor Tr1 non-conductive (off). At this time, the second terminal of the capacitor C4 is changed from being grounded to the system voltage V _DD (that is, changed from 0V to V _DD ), and the potential of the first terminal of the capacitor C4 is raised from the system voltage V _DD to 2V _DD . At the same time, the first terminal of the capacitor C5 is connected to the first terminal of the capacitor C4, and the second terminal thereof is grounded, so that the potential of the first terminal of the capacitor C4 is 2V _DD to charge the capacitor C5, so that the stored potential of the capacitor C5 is approximately equal to 2V _DD . Since the system voltage V _DD can directly charge the capacitor C4, its charging speed will be faster. The output capacitor C _OUT2 makes the output voltage V _OUT2 more stable.

The resistors R3 and R4 are connected in series between the output terminal of the charge pump 202 and the ground, so as to divide the output voltage V _OUT2 as the control signal V _CL . The control signal V _CL will be transmitted to the first terminal of the operational amplifier OP1. When the current or voltage at the output terminal of the charge pump 202 changes due to a load (not shown), the feedback unit 203 will reflect the change through the control signal V _CL . Since the control signal V _CL changes with the output terminal of the charge pump 202, the operational amplifier OP1 can dynamically control the transistor Tr1 in response to the change of the output terminal of the charge pump 202, so that the transistor Tr1 can quickly respond to the change of the output terminal of the charge pump 202 And adjust the basic voltage V _BASE , and then adjust the output voltage V _OUT2 of the charge pump 202 . In this way, this embodiment can achieve the function of dynamically feedbacking the change of the output terminal and conveying its reaction to the output terminal more quickly to stabilize the voltage, thereby reducing the ripple of the output voltage V _OUT2 and improving the output efficiency.

To sum up, in the dynamic feedback voltage stabilizing charge pump device of the present invention, by directly feeding back the change of the load current at the output end, it can quickly respond to the change, so that the voltage at the output end does not fluctuate due to the change of the current. In this way, the ripple of the output voltage can be reduced, and the capacitor can be directly charged by the system voltage to improve the output efficiency. Combining the above arguments, the dynamic feedback stabilized charge pump device of the present invention can detect and feed back the current change at its output end in real time, and can quickly feed back the current change and react at the output end. the

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention should be defined by the appended claims. the

Claims (13)

1. charge pump device comprises:

Voltage adjuster in order to receiving input voltage, and is output as fundamental voltage according to control signal with this input voltage adjustment;

Charge pump, the output that is coupled to this voltage adjuster to be receiving this fundamental voltage, and with after this fundamental voltage multiplication of voltage as output voltage; And

Feedback unit; Its input is coupled to the output of this charge pump to receive this output voltage; The output of this feedback unit is coupled to this voltage adjuster so that this control signal to be provided, and wherein this control signal is relevant with this output voltage, and wherein this voltage adjuster comprises:

Operational amplifier, its first end are coupled to the output of this feedback unit to receive this control signal, and second termination of this operational amplifier is received reference voltage;

Transistor, its grid is coupled to the output of this operational amplifier, its first source-drain electrode receives this input voltage, its second source-drain electrode as the output of this voltage adjuster to export this fundamental voltage; And

Switch, its first termination is received this input voltage, and its second end is coupled to the output of this operational amplifier.

2. charge pump device according to claim 1, wherein this transistor is the P-type mos transistor.

3. charge pump device according to claim 1, wherein this charge pump comprises:

Second switch, its first termination is received this input voltage;

First electric capacity, its first end is coupled to second end of this second switch, and second end of this first electric capacity is coupled to the output of this voltage adjuster to receive this fundamental voltage;

The 4th switch, its first end is coupled to first end of this first electric capacity, second end of the 4th switch as the output of this charge pump to export this output voltage; And

The 5th switch, its first end is coupled to second end of this first electric capacity, and second termination of the 5th switch is received second reference voltage.

4. charge pump device according to claim 3, wherein this second reference voltage is an earthed voltage.

5. charge pump device according to claim 3, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end of the 4th switch, and second termination of this output capacitance is received this second reference voltage.

6. charge pump device according to claim 1, wherein this charge pump comprises:

The 6th switch, its first termination is received this input voltage;

Second electric capacity, its first end is coupled to second end of the 6th switch, and second end of this second electric capacity is coupled to the output of this voltage adjuster to receive this fundamental voltage;

The 3rd electric capacity;

Octavo is closed, and it is coupled between first end of first end and the 3rd electric capacity of this second electric capacity;

The 9th switch, its first end is coupled to second end of this second electric capacity, and second termination of the 9th switch is received second reference voltage;

The tenth switch, its first termination is received this input voltage, and its second end is coupled to second end of the 3rd electric capacity;

The 11 switch, its first end is coupled to first end of the 3rd electric capacity, and second termination of the 11 switch is received this second reference voltage; And

Twelvemo is closed, and its first end is coupled to second end of the 3rd electric capacity, second end that this twelvemo is closed as the output of this charge pump to export this output voltage.

7. charge pump device according to claim 6, wherein this second reference voltage is an earthed voltage.

8. charge pump device according to claim 6, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end that this twelvemo is closed, and second termination of this output capacitance is received this second reference voltage.

9. charge pump device according to claim 1, wherein this charge pump comprises:

The 4th electric capacity;

The 5th electric capacity, wherein second end of the 5th electric capacity be coupled to this voltage adjuster output to receive this fundamental voltage;

The 13 switch, its first end is coupled to first end of the 4th electric capacity, and second termination of the 13 switch is received this input voltage;

The 14 switch, its first end is coupled to second end of the 4th electric capacity, and second termination of the 14 switch is received this input voltage;

The 15 switch, its first end is coupled to second end of the 4th electric capacity, and second termination of the 15 switch is received second reference voltage;

Sixteenmo closes, and it is coupled between first end of first end and the 5th electric capacity of the 4th electric capacity;

Eighteenmo closes, and its first end is coupled to second end of the 5th electric capacity, and second termination that this eighteenmo closes is received this second reference voltage; And

The 19 switch, its first end is coupled to first end of the 5th electric capacity, second end of the 19 switch as the output of this charge pump to export this output voltage.

10. charge pump device according to claim 9, wherein this second reference voltage is an earthed voltage.

11. charge pump device according to claim 9, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end of the 19 switch, and second termination of this output capacitance is received this second reference voltage.

12. charge pump device according to claim 1, wherein this feedback unit comprises:

First resistance, to receive this output voltage, second end of this first resistance controls signal to this voltage adjuster as the output of this feedback unit so that this to be provided to its first end as the input of this feedback unit; And

Second resistance, its first end is coupled to second end of this first resistance, the second end ground connection of this second resistance.

13. charge pump device according to claim 1, wherein this input voltage is a system voltage.

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