TW578382B - Low-power charge pump regulating circuit - Google Patents

Abstract

A low-power charge pump regulating circuit comprises a constant current source, a constant current controlled oscillator, a charge pump circuit, a detection circuit and a feedback current circuit. The constant current source provides a constant value of current, which is composed of the feeding back current of the feedback current circuit and the biased current of current controlled oscillation. The current controlled oscillator controls the stepping up rate of the charge pump circuit based on the magnitude of the biased current. If the load device extracts more electric power from the charge pump circuit, the feedback current outputted from the detection circuit to the feedback current circuit is smaller such that the biased current is increased so as to further increase stepping up rate of the charge pump circuit. If the load device extracts smaller electric power from the charge pump circuit, the feedback current outputted from the detection circuit to the feedback current circuit is larger such that the biased current is decreased so as to further reduce the stepping up rate of the charge pump circuit.

Description

578382

The present invention discloses a voltage regulation circuit, in particular, the electric energy output by a charge pump itself to a load. The frequency of the oscillator is used to adjust the output power of the charge pump. 1 Background of the Invention: "Use of portable electronic consumer products" power supply, and the use of rectifiers to carry: to use: But if the emphasis on its portability 'the most common way is to use the smart consumer products The basic battery is equipped with a random battery to provide its power. In addition to the battery's strength and weakness, in addition to the battery's material characteristics and related pools $ If the sub-product itself is designed in a low-voltage operation mode, the power consumption of the sub-product will be substantial. The notebook computer is The most typical example is that some of its components, such as DRAM, are designed to operate at 5 volts and 3.3 volts. However, for a notebook computer, its basic input / output system (basic input / output system; BIOS) The flash EEPR0M is a type of memory that must be operated at a voltage (such as 9 volts or 12 volts) when erasing and programming. Second, the notebook brain The operating voltage of the LCD display screen is another one that requires a high voltage to operate. Conventional technology In order to achieve the above-mentioned voltage, the typical method is to use electricity # 浦 浦 电路 (charge pump circuit) '配 一Electric pressure detection set

578382 i V. Description of the invention (2) i way, the excessive charge is released to complete. For an embodiment of the conventional technology, please refer to the block diagram of FIG. 1. A certain current source 10 is included, and a current-controlled oscillator 20 is provided to provide a charge pump circuit 30 with a power supply. The charge pump circuit 30 uses the clock provided by the oscillator 20 to increase the potential (or voltage), and the increased potential is output from the output terminal Vou to the load (for example, flash memory | cell array). When the potential is higher than a critical value, the voltage detection circuit i 4 0 is turned on to release the gold semi-transistor Mi. FIG. 2 is a schematic block diagram of another conventional technology. Please refer to Figure 2. It contains an oscillator 60 to control the charge pump circuit 70 boost rate. Charge: In addition to outputting electric energy to the load, the pump circuit 70 generates a signal to the detection circuit] i 80, and the detection circuit 80 outputs a voltage according to the signal. Next, the voltage signal output by the detection circuit 80 is compared with a reference voltage V re using a comparator 90. If the voltage signal output by the detection circuit 80 is greater than the reference voltage V re, the output of the oscillator 60 is turned off. Otherwise, the oscillator 60 provides a boost to the charge pump circuit 70 at a fixed frequency i. The above-mentioned conventional technology discharges its charge when the potential exceeds a preset value. Therefore, the circuit of the embodiment shown in FIG. 1 is operated under a full load condition because the oscillator 20 controlled by a constant current source does not The charge pump circuit 30 is slightly stretched to reach a predetermined voltage, so the effect of power saving cannot be achieved. In the embodiment of FIG. 2, although the oscillator 60 is adjusted, the oscillator 60 is either on or off, so it is difficult to achieve the effect of power saving. 578382 丨 V. Description of the invention (3)

I |

In view of this, the present invention will provide a power-saving operation mode, by which the present invention can prolong the operation time of electronic products due to the reduction of power consumption.

I i. The purpose and summary of the invention: |! The purpose of the present invention is to provide a low-power consumption charge pump regulation circuit design, using the size of the feedback current to adjust the current to control the output of the oscillator; . · The present invention discloses a low-power-consumption charge pump adjustment circuit design, including at least: a certain current source, a current control oscillator, a charge pump circuit, a detection circuit, and a feedback current circuit. The constant current source provides a certain value of the current distribution and feedback current circuit to feedback the current and the current control oscillator to bias the current. The current-controlled oscillator is controlled according to the magnitude of the bias current. 7: The rate at which the charge pump circuit steps up. If the load element draws power from the charge pump circuit I, the higher the rate. Then the feedback current output from the detection circuit to the feedback current circuit: the smaller the current is, to increase the bias current and further increase the rate at which the charge pump circuit raises the I voltage. If the load element draws power from the charge pump circuit, the smaller it is. Then $: Botest circuit makes the feedback current circuit feedback a larger feedback current to reduce the bias current and further reduce the rate of charge pump circuit boost. Detailed description of the invention: 578382 5. Description of the invention (4)! Figure 3 is a block diagram of a low-power-consumption-power-pump circuit designed according to an embodiment of the present invention. Figure 3 has a certain current source 100 from DC power supply V d to obtain power to provide a constant current I⑽ST, ICQNS is light | a bias current Ibia is provided by a current branch lio to cover the current controlled oscillator | 120. The current-controlled oscillator 120 provides a two- or four-phase operating frequency to the charge pump circuit 13 depending on the magnitude of the bias current I bia. The charge pump circuit 130 operates according to a plurality of phases provided by the current-controlled oscillator 120. The frequency increases the potential in stages. The increased potential of the charge pump circuit 130 is output from the V ou terminal to the load element circuit 14. According to an embodiment of the present invention, the load element circuit 150 is a flash EEPROM. Note: The voltage and current required for data erasure and programming. Therefore, the electric charge pump circuit 130 provides electric energy.丨 At the same time, a part of the electric power generated by the charge pump circuit 130 flows to the detection circuit 150. There are two ways of designing the detection circuit 150. The first design is a taxi: when the output voltage of the charge pump circuit 130 exceeds a rated value, it will make an angry test; the circuit 150 starts to work. When the output voltage of the charge pump circuit 130 exceeds a threshold value, the voltage is also output to the flash memory circuit 1 4 0. And when the flash memory extracts a large amount of electric energy (high current), the detection current of the flow detection circuit is reduced, so the smaller feedback current output is reflected on the feedback current circuit 160. To promote bias current! —Increase, further increase the speed of the charge pump circuit 130 boost. 578382 i. Description of the invention (5) "!;. If the flash memory circuit 1 4 0, the current drawn from the circuit (small current) to the detection / circuit 1 50 0 will increase relatively, and Promote the output of the test circuit 1 50 compared to: the large feedback current If ^ on the feedback current circuit 16 0 to reduce the bias current 1 I bias (because I bias = I CONST- I fb) At this time, the current control The electric current of the oscillator 1 2 0 will decrease accordingly, and the lower operating frequency will be output, and the current controlled oscillator 1 2 will automatically output a lower frequency signal, and the charge pump circuit 1 3 0 will increase the rate Thus reduced. If the output voltage of the charge pump circuit 130 does not reach the rated value, the flash memory circuit 140 will not work. The detection circuit 150 will not work either. Therefore, there is no output loop current I f in the feedback circuit, and the bias current I bia is the largest, which causes the boost rate of the charge pump circuit 130 to increase.

I The second design of the detection circuit 1 50 is the detection circuit 1 50—it remains in the ^ working state and increases as the voltage of the charge pump circuit 1 3 0 increases: output to the feedback current circuit 1 6 0. Therefore I f rises and makes I bia low. When the voltage of the I charge pump circuit 130 reaches a rated value, it will simultaneously output power to the flash memory circuit 140. If the flash memory circuit 140 draws less power, the current flowing into the detection circuit 150 will increase and I f will be higher, causing I bia to be lower. Therefore, the charge pump circuit 130 will pump The rate is reduced to reduce the loss of Λ electrical energy. In contrast, if the flash memory circuit 140 draws more power, the current flowing into the detection circuit 150 will decrease, and the I fI will decrease and

I 丨 raises Ibia to increase the pumping rate of the charge pumping circuit 130. 578382 V. Description of the invention (6) The invention is therefore a dynamically adjusted charge pump circuit 130, which can reduce energy consumption. Figures 4 (a) to 4 (d) are schematic diagrams of signals simulated according to an embodiment of the present invention. Figure 4 (a) shows the change in the amount of current drawn from the v dd power supply due to the different load sizes of the charge pump circuit 130. Figure 3 (b) shows the change of the output voltage of the charge pump circuit 130. Figure 3 (c) shows the voltage change of the flash memory cell array actually input by the charge pump circuit 130. Figure 3 (d) shows the change in the frequency of the output of the current-controlled oscillator 120. When the output of the charge pump circuit 130 has not reached the predetermined voltage value V, the frequency of the output of the current-controlled oscillator 120 is extremely high. " At the Απ stage, when the charge pump circuit 130 outputs a predetermined voltage value (ie, the voltage required for programming or erasing), if the flash memory circuit 1 40 draws a small amount of current, the charge pump circuit 1 3 0 The output frequency is low, as shown in the phase π Β. Also, when the flash memory cell circuit 140 draws a large current, the current flowing to the detection circuit 150 relatively decreases, so that I is low and I bia is increased. The current output frequency of the current-controlled oscillator 120 will also increase accordingly, so that the output voltage of the charge pump circuit 130 is stable. As shown in stage n Cn. The above is only a preferred embodiment of the present invention. It is not intended to limit the scope of patent application of the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed by the present invention should be included in the scope of the following application 专利 patents.

I Schematic illustration of the preferred embodiment of the present invention will be explained in more detail in the following explanatory text with the following figures: Figure 1 shows the block diagram of the first traditional charge pump tuning circuit design. Figure 2 shows The second type of traditional electric pump adjustment Ar / r is the block intention of the circuit design. Figure 2 shows the electric circuit Jr and the pump adjustment circuit designed by the method of the present invention: The invention of the design of the electric pump · 々 / Γ is the circuit and -in. The analog signal of the circuit is calculated. The drawing number is shown in the table. • Constant current source 10, 100 current-controlled oscillator 20> (30, .120 charge pump circuit. 70 > 130 load element circuit 140 load element 140 detection circuit 40, 30, * 150 branch 110 feedback current circuit 160

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Claims (1)

578382 I VI. Application for patents 丨 1. A low power consumption charge pump adjustment circuit, at least: ^ a certain current source, providing a rated current; a current control oscillator is coupled to the constant current source, the The current control oscillator changes the output signal frequency according to the input bias current. A charge pump circuit is coupled to the current control oscillator. The charge pump circuit is based on the signal frequency output of the current control oscillator frequency. Adjust the boost rate; a certain voltage load circuit is coupled to the charge pump circuit to extract the electric energy of the charge pump circuit; a detection circuit is coupled to the output terminal of the charge pump circuit, and when the electric load The larger the power output from the pump circuit to the constant voltage load circuit, the smaller the current output by the detection circuit; and a feedback current circuit coupled to the detection circuit and the constant current source, the feedback current The feedback current of the circuit is adjusted according to the current output of the detection circuit / and the sum of the current of the feedback current and the bias current is equal to the The current value. β 2. If the circuit of item 1 of the patent application scope, wherein the relationship between the current output of the detection circuit and the feedback current is that the smaller the current output current output of the detection circuit, the smaller the feedback current. As the current output of the detection circuit is larger, the feedback current is larger. 3. If the circuit of the first item of the patent application scope, the smaller the input current of the above detection circuit, the smaller the output current will be. 578382 VI. Application for patent scope 4 Includes as low as -i-Iar Set the power consumption of the road and the power consumption of the pump to reduce the power of the low power supply for the source current fixed current value fixed power rate, the frequency connection, signal connection The source of the generator is the vibration control of the power transmission. The control of the power supply is changed. The current and the power of the device and the voltage of the oscillating circuit are controlled by the pump. The current should be charged when the electric power is applied; the electrical rate should be as fast as the pressure. The connection rate is adjusted to produce a small output with a large output. The more the output voltage of the piezoelectric circuit is measured, the higher the output voltage of the output circuit and the power supply are; As long as the current is passed and the circuit is returned, the circuit will return to the circuit once it is returned, the larger the more, the smaller the output, the lower the voltage, and the lower the voltage. When it ’s small, when the power is large, it will be transferred back to the whole power supply. And the other stream back to the voltage of the biasing power of the total stream flow electrical feedback Hyun = ° and back. Parallel current, the smaller the value is, the more the current will flow to Λ 5. — A low power consumption charge pump circuit design, at least: a certain current source, providing a rated current; a current control oscillator and the The constant current source is coupled, and the current control oscillator changes the output signal frequency according to the input bias current. A charge pump circuit is coupled to the current control oscillator, and the charge pump circuit controls the oscillator frequency according to the current. Size and adjust the boost rate; a detection circuit is coupled to the output terminal of the charge pump circuit, and when the Page 12 578382 VI. Scope of patent application The detection circuit starts when the voltage output from the pump circuit reaches a critical value. i output current; and a feedback current circuit is coupled with the detection circuit and the constant current source, I the feedback current of the feedback current circuit is adjusted according to the current output i of the detection circuit The larger the current output of the detection circuit, the larger the feedback current. The smaller the current output of the detection circuit, the smaller the feedback current, and the feedback current and the bias voltage. The sum of current 1 current is equal to the rated current. Bind