TW200821814A - Voltage regulation unit with zener diode and voltage regulation device thereof - Google Patents

Abstract

A voltage regulation unit with a Zener diode receives a driving voltage outputted from a charge pump and regulates the driving voltage roughly at a constant voltage value. The voltage regulation unit comprises a current mapping unit, a Zener diode and a biasing unit. The current mapping unit comprises a master current end and a slave current end. The master current end and the slave current end receive the driving voltage and generate a first current signal and a second current signal according to the driving voltage respectively. The Zener diode receives the first current signal and holds the driving voltage roughly at a constant voltage level. The biasing unit receives the second current signal and generates a control signal according to the second current signal. Wherein, the control signal is sent to the charge pump and used to control the charge pump generating the driving voltage.

Description

200821814

• TRIDA number: TW3173PA IX. Description of the invention: [Technical field of the invention] The present invention relates to a voltage regulator device using a Zener diode, and in particular to a power loss reduction A Zener diode voltage regulator is used. [Prior Art], refer to FIG. 1A, which shows a circuit diagram of a conventional voltage stabilizing device using a Zener diode. The enable signal EN is used to enable the voltage regulator 1〇〇. The timing signal generates the early element 10 2 and is driven to generate the timing afl number CLK, and the charge pump 1〇4 drives the load device 11〇 according to the timing signal CLK to increase the voltage level of the output voltage Vout. Please refer to FIG. 1B, which is a graph showing the current versus voltage of the Zener diode 106 in FIG. 1A. When the Zener diode 106 operates in the collapse zone, it has a special voltage-to-current characteristic curve; at this time, regardless of the current flowing through the Zener (the current Iz of the diode 106, the Zener diode 1〇6 The voltage across the voltage is still substantially equal to the breakdown voltage Vzl of the Zener diode 106, so that the output voltage Vout is substantially equal to the breakdown voltage Vzl, and the voltage stabilization effect is achieved. However, the conventional voltage regulator device 100 has several disadvantages. 1〇〇 The operation of the charge pump 104 cannot be terminated when the output voltage Vout reaches a predetermined voltage level. The charge pump 1〇4 is continuously operated to raise the voltage level of the output voltage Vout, and generates an output current via Zener II. The pole body 106 is introduced into the grounding level. Thus, the voltage regulator device 1 has a power consumption and the power utilization rate (Power Efficiency) is higher than 6 200821814.

- Sanda number: TW3173PA Low disadvantage. In addition, since the temperature coefficient of the Zener diode 1 〇 β is not zero, the voltage across the Zener diode 106 changes with temperature. The temperature coefficient of the Zener diode is, for example, a positive number. In this way, the voltage regulator hits the 100 series and has the disadvantage that the output voltage V〇ut will change with the temperature change. 0 Refer to the 1C diagram, which is a traditional non-utilizing the Zener diode. Set the circuit diagram. The voltage regulator device 1 enables the transistor τ 经由 to output the voltage level of the output voltage v 〇 2 via the output voltage Vol of the operational amplifier Op 1 . The voltage regulator device 10 further returns the output voltage v〇2 to the negative terminal of the operational amplification state 0P1, so that when the voltage level of the output voltage V〇2 is higher than the voltage level of the wheel-out voltage VI, the operational amplifier op is used. The transistor Tx is disabled and the output voltage v〇2 is pulled low via the current source 112. In this way, the output voltage V〇2 is regulated by a negative feedback method. However, since the voltage regulator ίο needs to be provided with the operational amplifier OP1 to regulate the output voltage v 〇 2, the device 1G has the disadvantages of complicated circuit and high cost. SUMMARY OF THE INVENTION In view of the above, (4) provides the advantage of using _ ^ ^ ^ ^ ^ clothing, which has lower power consumption, simpler power usage, and lower cost. According to the invention, a voltage stabilizing unit is provided for receiving a driving voltage of a charge 豕 (Charge P_) output, and the voltage release unit includes: a current mapping unit, a 耵 耵, a Zener diode, and a bias Pressure unit. 7 200821814

Sanda number: TW3173PA The current mapping unit includes a current master and a current slave. The current mapping unit is configured to receive the driving voltage, and generate the first current signal and the second current signal respectively according to the driving voltage at the current main terminal and the current slave terminal. The negative terminal of the Zener diode is coupled to the current control terminal, and the positive terminal receives a fixed voltage. The Zener diode receives the first current signal and controls the voltage level of the driving voltage to be substantially equal to the predetermined voltage level to regulate the driving voltage. The biasing unit is configured to receive the second current signal, and determine whether the voltage level of the driving voltage reaches a predetermined voltage level according to the second current signal, and generate a control signal according to the second current signal. The control signal is fed back to the charge pump to control the charge pump to generate the driving voltage. According to the present invention, a voltage stabilizing device is provided, which comprises: a charge pump, a voltage stabilizing unit, a detecting unit and a timing signal generating unit. The charge pump is used to output the drive voltage. The voltage stabilizing unit comprises: a current mapping unit, a Zener diode and a biasing unit. The current mapping unit includes a current master and a current slave. The current mapping unit is configured to receive the driving voltage, and generate the first current signal and the second current signal respectively according to the driving voltage at the current main terminal and the current slave end. The negative terminal of the Zener diode is coupled to the current control terminal, and the positive terminal receives a fixed voltage. The Zener diode receives the first current signal and controls the voltage level of the driving voltage to be substantially equal to the predetermined voltage level to regulate the driving voltage. The biasing unit is configured to receive the second current signal, and determine whether the voltage level of the driving voltage reaches a predetermined voltage level according to the second current signal, and generate a control signal according to the second current signal. The detecting unit is configured to receive the control signal and generate the first enabling signal according to the control signal. The timing signal generating unit receives the first enabling signal and generates the first enabling signal according to the first enabling signal.

• Sanda number: TW3173PA raw timing signal and reverse timing signal. The timing signal and the reverse timing signal are output to the charge pump, and the charge pump generates the driving voltage according to the timing signal and the reverse timing signal. In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below in conjunction with the accompanying drawings, and the following detailed description will be made as follows: [Embodiment] γ 清参知弟 2 A diagram, its meaning A circuit diagram of a voltage stabilizing device utilizing a Zener diode in accordance with a preferred embodiment of the present invention. The voltage stabilizing device 2A includes a timing signal generating unit 202, a charge pump 204, a voltage stabilizing unit 206, and a detecting unit 208. The timing signal generating unit 202 is configured to receive the enable signal EN', and accordingly generate the timing signal CLK' and the reverse timing signal CLKB. The charge pump 204 receives the timing signal CLK' and the reverse timing signal CLKB and generates an output voltage Vout' to drive the load device 210. The voltage stabilizing unit 206 includes a current mapping unit 206a, a Zener diode 206b, and a biasing unit 206c. The current mapping unit 206a has a current master 212a and a current slave 212b. The current mapping unit 206a receives the output voltage Vout' and uses the output voltage Vout as a driving voltage to be dependent on the current terminal 212a and the current according to the driving voltage. The terminal 212b generates a current signal II and a current signal 12, respectively. The current values of current signals 12 and 12 are related. The negative terminal of the Zener diode 206b is coupled to the current master terminal 212a, and the positive terminal receives the fixed voltage VB. The Zener diode 206b receives the current signal II and controls the voltage level of the output voltage Vout' to be substantially equal to a predetermined 9 200821814

• Sanda number: TW3173PA voltage level, to regulate the output voltage. The biasing unit 2〇6C receives the current signal 12, and determines whether the voltage level of the output voltage but reaches a predetermined voltage level according to the current signal 12, and generates a control signal sc according to the current signal 12. In the present embodiment, the fixed voltage νβ is, for example, a ground potential, and the current values of the current signals Π and 12 are, for example, equal. The detecting unit 208 receives the control signal SC, and detects whether the output voltage Vout' reaches a predetermined voltage level according to the control signal SC; if so, the measuring unit 208 sets the enabling signal EN to be a non-enabled level and The feedback is caused by the EN' to the timing signal generating unit 2〇2, so that the timing signal generation unit 2〇2 stops generating the timing signal to the ^^, and the reverse timing signal ^〇, to stop the operation of the charge pump 204 . In this way, the charge pump 204 can be terminated by means of signal feedback to reduce power consumption and improve power efficiency. The detecting unit 208 further receives a system enable signal ENS, and activates the voltage stabilizing device 2〇〇. The system enable signal ENS is for example a voltage signal. When the system enable signal ENS is in an inactive level, the enable signal EN is continuously located at the non-enabled level, so that the timing signal generating unit 202 and the charge pump 204 are continuously disabled and cannot be generated. Output voltage V〇u1: '° When the system enable signal ENS is enabled, it will cause the detection to stay early 7^208 to start detecting the control signal sc to determine the current value of the current signal 12' and according to the charge pump 204 controls. Please refer to FIG. 2B, which is a circuit diagram of the voltage stabilizing unit 206 in FIG. 2A. In this embodiment, the current mapping unit 2〇6a includes two p-type metal oxide semiconductors (Metal Oxide Semiconductor, 200821814).

Sanda number: TW3173PA M〇S) T and T2 current urrent 2 series are current main control terminal for example, such as 212b 'and current but Q and words, six source currents 1 crystal Γ and 12 series They are the electric 曰曰曰 τ:, the source (s〇_also phase = the secret is called the phase 〇) _) the system is _ connected to = 'to connect (four) power out 咐, ΟΛΡ to Zener two poles The volume of the body 206b and the 槌Γ: so too: the crystals T1 and T2 have substantially opposite and partial units, and in this embodiment, the upper surface 1 (full/Length) of the transistor Π and Τ2 are equal. For example, such a 'see ratio:: has a substantially equal source current, and gp is *Electronic crystal Zhao Yi 1 and 12 are substantially equal. Among them, electro-crystal: current signal ^ 顺通通二The polar body (DiQde), whose temperature system is configured to be in the implementation of the present invention, is substantially negative in the predetermined electric job. The Zener diode 20613 is used to output the voltage V〇Ut, Called, for the voltage level of the toe. Its towel vth is fixed for the transistor n

:? The collapse voltage of the Zener diode. When the output is = the registration is: 啼N|, that is, the output voltage is pressed, 'too low does not reach the predetermined voltage level, the transistor τι and T stop: and the current values of the current signals 11 and 12 are substantially Both are zero. When the voltage level of the output Vout is V:== (4), that is, when the voltage level of the output voltage Vout reaches the predetermined voltage level, the transistors τι and D2 are both turned on and operate in the saturation region. At this time, the current values of the current signals η and 12 are both greater than zero and substantially equal. The biasing unit 206c includes a current source 214 and a node ΝΤ1, a current source 200821814

Sanda number: TW3173PA 214 is used for output-bias current IB from the node to the ground level. The voltage at node m is determined by current signal 12 and bias current_. When the output voltage Vout* reaches a predetermined voltage level, the transistor (4) is turned off, and the current value of the current signal 12 is substantially zero. At this time, the voltage level of the node NT1 will be biased to a level close to the ground by the bias current Ιβ. When the output voltage reaches a predetermined voltage level, the transistor T2 is turned on for operation in the saturation region. At this time, the current value of the current signal i2 is greater than zero' to raise the voltage level of the node NT1 from the ground level to the voltage level close to the output voltage v〇ut, that is, the voltage level of the node NT1. Quasi-biased to a high voltage level. In the embodiment, the voltage of the node NT1 is used as the control signal sink, and is output to the unit 208. "Please refer to Figure 2C, the green diagram is the ping circuit diagram of the detection unit in Figure 2A. In this embodiment, the circuit for detecting the single A 2 〇 8 including the transistors I ^ and T5 , the buffer 216 , and the gate ( 5 ) 218 is taken as an example. The source of the transistor T3 receives the high voltage level (4), and the gate receives the ground level. Thus, the transistor T3 is always turned on to form a path connected to the 咼 voltage level Vdd to turn the voltage of the node NT2. The level is biased to a high voltage level Vdd. The transistors T4 and T5 are the impurity receiving grounding level of the N-type gold-oxygen semiconductor transistor 'Electrical crystal T5'. The source of the drain-type fish-electric crystal T4 is lightly connected, and the gate is used to receive the system-enabled signal fragile. The drain of the transistor T4 is drained from the drain of the transistor T3 to form the node nt2, and the gate receives the control signal %. The transistors Τ4 and Τ5 are connected in series to each other to form a ground path to bias the voltage level of the node NT2 to the ground level, and 12 200821814

. Sanda Number: TW3173PA This ground path is controlled by the control signal sc and the system enable signal ENS. In this embodiment, the enable level of the system enable signal ENS and the enable signal EN are both high voltage levels, and the non-enable levels are low voltage levels. When the system enable signal ENS is non-enabled, the enable signal ΕΝ' is controlled to the non-enabled level regardless of the level of the control signal SC. At this time, the voltage stabilizing device 200 is disabled. When the system enables the signal ens to be the enable level and the control signal SC to the high voltage level, the system enable signal s / and the control signal SC will respectively enable the transistors T4 and T5 to set the voltage level of the node NT2. Pulling down to the ground level causes the voltage level of the node NT2 to be a low voltage level, thereby making the enable signal EN' a non-enabled level. Therefore, the detecting unit 208 can disable the enable signal EN' according to the control signal sc at a high voltage level to disable the operation of the charge pump 204 via the timing signal generating unit 202. When the system enable signal ENS is the enable level and the control signal sc is the low voltage level, the control signal SC turns off the transistor T4, so that the voltage level of the node NT2: is a high voltage level, thereby enabling the enable signal EN, To enable \ ' level. In this manner, the detecting unit 208 can cause the enable signal EN to be leveled according to the control signal SC at the low voltage level to enable the operation of the charge pump 2〇4 via the timing signal generating unit 202. The timing signal generating unit 202 is, for example, a well-known timing signal generating circuit as shown in Fig. 2D. The timing signal generating unit 202 receives the enable signal EN' to output the timing signal CLK and the reverse timing signal CLKB by the reverse voltage characteristic of the inverter. The charge pump 204 is also, for example, a generally notified charge pump circuit as shown in Figure 2E. Charge pump 204 13 200821814

• Sanda number: TW3173PA receives the timing signal CLK', the reverse timing signal CLKB and the high voltage level Vdd, and is controlled by the timing signal CLK' and the reverse timing signal CLKB to generate the output voltage V〇ut'. The high voltage level vdd is, for example, the input voltage of the charge pump 204. The load device 210 is, for example, a flash memory (ρ 1 ash). The output voltage Vout' is input to the data line (Bit Line) as a flash memory to supply voltage to inject electrons into the flash memory unit, and the suspension layer of the transistor in the (Memory Cel 1) Gate), to write poor materials; or provide voltage to draw electrons out of the suspension layer for data removal. In this embodiment, the current values of the current signals U and 12 are substantially the same as an example. However, the current signals u and 12 may be in any other ratio. In this embodiment, the current mapping unit 2〇6a is exemplified by a current mirror including two p=metal oxide semiconductor transistors T1 & T2. However, the current mapping unit 2〇6a is not limited to the embodiment. The structure, and more can be /, the other type of current mirror 'such as a cascade configuration (Cascode) current mirror ' or other circuit that can output two current value related to the current signal structure. In this embodiment, the charge pump 2〇4 is indirectly controlled by the input of the enable signal EN to the timing signal generator 202. However, the pressure device 200 of the embodiment may also select the enable signal pin. The charge pump 204 device, the sub-enable signal leg, is directly input to the charge pump 2〇4 to control the operation of the charge pump 204. The voltage stabilizing unit and the voltage stabilizing device using the Zener diode of the present embodiment generate two current signals related to the current value according to the output voltage.本实14 200821814 ^达编号: TW3173PA The example uses the Zener diode's voltage regulator unit to send a current signal to the Zener diode, and the wheel device is wheeled into another current signal as a control signal. , voltage-free voltage regulation, and A is very dependent on whether the voltage has reached the predetermined voltage value. : Brush the signal to judge the regulator unit of the input diode to feedback the control signal to the band. When the Zener voltage reaches the predetermined voltage level, the non-enable charge is used to pump the Zener diode. The voltage stabilizing unit of the body can be such that, in this embodiment, the output voltage can not reach the predetermined voltage regulator pump, and the power consumption is high, and the power usage is reduced, the charge is low, and the power consumption efficiency is improved. The advantage of the low = low has the other 'the second embodiment of the Zener diode using the Zener diode to utilize the Zener diode and the substantially forward bias and the voltage regulator: the hunger master The output voltage is biased to a predetermined value - although the temperature coefficient of the diode is negative. , Quasi, and the guide is more versatile Zener diode into the household master guide through the two poles to compete in the game of the shadow of the film ^ and Ge hand 'number of compensation' to reduce the temperature on the wheel body - In each case, the use of Zener diodes in this embodiment can effectively solve the traditional use of the singular points, while the electricity (4) is affected by the temperature and the offset is missing / / there is a wheel voltage level The advantage of being more stable. In the case of the attack system, the stable unit of the Zener diode and the stable 鹌 are used, and the simple circuit results between the Sinar diode, the transistor and the logic are taken. Such as ^, the application of the circuit to achieve voltage regulation and control of the charge pump effect device times! 1. The voltage stabilizing unit and the voltage regulator using the Zener diode of the present embodiment have improved the traditional non-utilizing Zener diodes. 200821814

• Sanda number: TW3173PA has the disadvantages of complicated circuit and high cost, and has the advantages of simple circuit structure and low cost. In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

16 200821814

• Sanda number: TW3173PA [Simple description of the diagram] Figure 1A shows the circuit diagram of a conventional voltage regulator using a Zener diode. Fig. 1B is a graph showing the current versus voltage of the Zener diode 106 in Fig. 1A. Figure 1C shows a circuit diagram of a conventional voltage regulator that does not utilize a Zener diode. 2A is a circuit diagram of a voltage stabilizing device using a Zener diode f 1 body in accordance with a preferred embodiment of the present invention. FIG. 2B is a detailed circuit diagram of the voltage stabilizing unit 206 in FIG. 2A. FIG. 2C is a detailed circuit diagram of the detecting unit 208 in FIG. 2A. Figure 2D shows the truth table of the control signal SC, the system enable signal ENS and the enable signal EN in Figure 2C. Fig. 2E is a detailed circuit diagram of the timing signal generating unit 202 in Fig. 2A. 1 [Description of main component symbols] 100, 200: Voltage regulator ΕΝ, EN': Enable signal 102, 202: Timing signal generation unit CLK, CLK': Timing signal 104, 204: Charge pump

Vout, Vout': output voltage 106, 206c: Zener diode 17 200821814

Sanda number: TW3173PA

Vzl: breakdown voltage Iz: current flowing through the Zener diode 110, 210: load device 206 · voltage regulator unit 206a: current mapping unit 212a: current master terminal 212b: current slave terminal II, 12: current signal VB : Fixed voltage 206c · · Bias unit SC : Control signal 208 : Detection unit ENS : System enable signal CLKB : Reverse timing signal ΤΙ , T2 , T3 , T4 , T5 : Transistor Vth : Critical voltage 214 · Current source NT1, NT2: node IB: bias current Vdd: high voltage level 216: buffer 218: and gate 18

Claims (1)

200821814 Sanda number: TW3173PA X. Patent application scope: 1. A voltage stabilizing unit for receiving a driving voltage of a charge pump output and regulating the driving voltage. The voltage stabilizing unit includes: a current mapping unit comprising: a current master and a current slave: 3⁄43⁄4 'ΰ海笔&L mapping early element for receiving the driving voltage, and according to the driving voltage at the current master and the current slave The terminal generates a first current signal and a second current signal respectively; a Zener diode, the negative terminal of the Zener diode is coupled to the current control terminal, and the positive terminal receives a fixed voltage, the Zener diode The pole body receives the first current signal, and controls the voltage level of the driving voltage to be substantially equal to a predetermined voltage level to regulate the driving voltage; and a biasing unit 'to receive the second current signal And determining, according to the second current signal, whether the voltage level of the driving voltage reaches the predetermined voltage level and generating a control signal according to the second current signal. Feedback signal to the charge pump to control the electrical charge pump generates the U drive voltage. 2. The voltage regulator unit of claim 1, wherein the control signal is input to a price measurement unit, and the detection unit further receives a first enable signal for the first enable signal and the The control signal generates a second enable signal. 3. The voltage-sensing unit of claim 2, wherein the second enable signal is input to a timing signal generating unit, and the timing signal generating unit generates a timing signal according to the second enabling signal and - Reverse ^ 19 200821814 - Sanda number: TW3173PA sequence signal. 4. The voltage stabilizing unit according to claim 3, wherein the charge pump receives the timing signal and the reverse timing signal to generate the driving voltage according to the timing signal and the reverse timing signal, the charge pump And output the driving voltage. 5. The voltage stabilizing unit of claim 1, wherein the charge pump further receives an input voltage and generates the driving voltage according to the input voltage. #":, ^ 6. A voltage regulator device, comprising: a charge pump (Charge Pump) for outputting a driving voltage; a voltage stabilizing unit comprising: a current mapping unit comprising: a current master And a current slave unit, wherein the current mapping unit is configured to receive the driving voltage, and generate a first current signal and a second current signal respectively according to the driving voltage at the current main control terminal and the current slave terminal; a pole body, a negative end of the Zener diode is coupled to the current main terminal, and a positive terminal receives a fixed voltage, the Zener diode receives the first current signal, and controls a voltage level of the driving voltage Is substantially equal to a predetermined voltage level to regulate the driving voltage; and a biasing unit for receiving the second current signal, and determining whether the voltage level of the driving voltage is based on the second current signal A predetermined voltage level is reached, and a control signal is generated according to the second current signal; a detecting unit is configured to receive the control signal, and according to the control signal 20 200821814 - Sanda number: TW3 The 173PA generates a first enable signal; and a timing signal generating unit receives the first enable signal and generates a timing signal and a reverse timing signal according to the first enable signal; wherein the timing signal and The reverse timing signal is output to the charge pump, and the charge pump generates the driving voltage according to the timing signal and the reverse timing signal. 7. The voltage regulator device of claim 6, wherein the detecting unit further receives a second enabling signal, the detecting unit generating the first according to the second enabling signal and the control signal Consistent signal. 8. The voltage regulator of claim 7, wherein the second enable signal is a system enable signal to enable the voltage regulator to perform a voltage stabilizing operation. 9. The voltage regulator of claim 6, wherein the charge pump further receives an input voltage, and the charge pump generates the driving voltage according to the input voltage, the timing signal, and the reverse timing signal. twenty one