TWI323405B - Voltage regulation unit with zener diode and voltage regulation device thereof - Google Patents

Description

1323405

Sanda number: TW3173PA IX. Description of the invention: [Technical field to which the invention pertains] · The present invention relates to a voltage regulator device using a Zener diode, and in particular to a power loss The Zener diode is used as a voltage regulator. [Prior Art] • Please 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 stabilizing device 100. The timing signal generating unit 102 is driven by the enable signal EN to generate the timing signal CLK, and the charge pump 104 drives the load device 110 according to the voltage level of the output voltage Vout according to the timing signal CLK. 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 region, it has a special voltage-to-current characteristic curve; at this time, regardless of the current Iz flowing through the Zener diode 106, the voltage across the Zener diode 106 is across. It 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 stabilizing device 100 has several disadvantages. The voltage stabilizing device 100 cannot terminate the operation of the charge pump 104 when the output voltage Vout reaches a predetermined voltage level. The charge pump 104 is continuously operated to raise the voltage level of the output voltage Vout, and the output current is led to the ground level via the Zener diode 106. In this way, the voltage stabilizing device 100 will have higher power consumption and power efficiency (Power Efficiency) than 6 1323405.

Sanda number: TW3173PA low disadvantage. In addition, since the temperature coefficient of the Zener diode 106 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. Thus, the voltage stabilizing device 100 further has an output voltage Vout that varies with temperature. Refer to FIG. 1C, which shows a circuit diagram of a conventional voltage stabilizing device that does not utilize a Zener diode. The voltage regulator device 1 activates the transistor 经由 via the output voltage Vol of the operation 〇P1 • to increase the voltage level of the output voltage v 〇 2 . The voltage regulator device 10 further supplies the output voltage V〇2 to the negative terminal of the operational amplifier OP1, so that when the voltage level of the output voltage Vo2 is higher than the voltage level of the output voltage VI, the operational amplifier ορι non-enabling transistor Tx, and pulls the output voltage V〇2 low via current source 112. In this way, the output voltage Vo2 is regulated by a negative feedback method. However, since the voltage stabilizing device 10 is required to set the operational amplifier OP1 to regulate the output voltage Vo2, the voltage stabilizing device 10 has the disadvantages of complicated circuit and high cost. SUMMARY OF THE INVENTION In view of the above, the present invention provides a Zener Diode (Zener Diode) voltage stabilizing unit and a voltage stabilizing device, which have low power consumption, high power consumption, and relatively simple circuit. The advantage of lower cost. According to the present invention, a voltage stabilizing unit is provided for receiving a driving voltage of a charge pump output and regulating a driving voltage. The voltage stabilizing unit includes: a current mapping unit, a Zener diode, and a fresh element. 7 1323405

Sanda number: TW3H3PA current mapping unit includes current master and 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 on the current main control end and the electric current flow. 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. A charge pump is used to drive 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 on the current main terminal and the current slave end. The negative terminal of the Zener diode is coupled to the positive terminal of the current terminal to receive 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 a first enable signal according to the control signal. The timing signal generating unit receives the first enabling signal and generates 1323405 according to the first enabling signal.

No. 3: 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 of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 2A, FIG. A circuit diagram of a voltage stabilizing device using a Zener diode of the preferred embodiment. 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 generate the timing signal CLK' and the reverse timing signal CLKB accordingly. 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 terminal 212a and a current slave terminal 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 voltage at the current master terminal 212a and the current slave. The terminal 212b generates a current signal II and a current signal 12, respectively. The current values of current signals π 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 1323405

No.: TW3173PA: The pressure level is used to regulate the output voltage v〇ut, $. The biasing unit·receiving current signal 12 ′ determines whether the voltage level of the output electric appliance ^>ut 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 w is, for example, the ground current = 'current signals u and 12, and the current values 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 the detection unit sets the enable signal, the non-enabled level is returned The moon color signal EN to the timing signal generating unit 2Q2 causes the timing signal generating unit 202 to stop generating the timing signal CLK and the reverse timing signal ακΒ to terminate the operation of the charge pump 204. In this way, the charge pump 204 operation can be terminated by means of signal feedback to achieve the effect of reducing power consumption and improving power efficiency. The detecting unit 208 further receives a system enable signal ENS for enabling the voltage stabilizing device 20 (the system enables the signal ENS to be, for example, a voltage signal. When the system enables the signal ENS to be a non-enabled level, it will enable The enable signal EN' is continuously at the non-enabled level, so that the timing signal generating unit 202 and the charge pump 204 are continuously disabled and cannot generate the output voltage Vout'. When the system enables the signal ENS to be enabled At the timing, the detecting unit 208 starts to detect the control signal SC to determine the current value of the current signal 12, and accordingly controls the charge pump 204. Please refer to FIG. 2B, which is shown in FIG. 2A. A detailed circuit diagram of the unit 206. In the present embodiment, the current mapping unit 206a includes two P-type metal oxide semiconductors (Metal Oxide Semiconductor,

No.: TW3173PA MOS) Current mirrors of transistor Τ1 and Τ2 ((:urrent Μι_) for example, Γ山Β Β ΜΤΐ and ^^ are current master terminal 212&amp; and current slave terminal 212b' and current signal (four) are respectively The transistor η and η = current. The gates of the transistors T1 and Τ2 are coupled to each other; ', jade. Rainbow (8) is also connected to each other to receive the output voltage V〇ut, the drain (Dr The in) is coupled to the negative terminal of the Zener diode 2_ and the biasing unit 206c such that the transistors T1 and T2 have substantially equal closed-source voltages. This embodiment is an transistor Τ1. And the aspect ratio (Width/Length) of Τ2 is equal, for example, so that the transistors T1 and T2 have substantially equal source currents, that is, the current signals n and 12 are substantially equal. The transistor τι is, for example, configured as a diode-connected diode (DiQde), which is a negative value on the temperature side. In this embodiment, the predetermined voltage level is substantially: _ remaining thorn, S The nano-pole 206b is used to fix the voltage of the wheel voltage v〇ut to a predetermined voltage level, wherein Vth is a crystal The threshold voltage, Vzl is the breakdown voltage of the Zener diode 2〇6b. When the voltage level of the output voltage is: (<4). (4), that is, the output voltage is too low, the voltage level is too low. When the voltage level is normal, the transistors 71 and 12 are both off and the current values of the current signals II and 12 are substantially zero. When the voltage level of the output voltage Vout is: % said = called + (four) 丨, that is, the output When the voltage level of the voltage Vout reaches the predetermined voltage level, the transistors T1 and τ2 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. Including current source 214 and node ΝΤ1, current source 1323405

Sanda number: TW3173PA 214 is used for output-bias current Ιβ is introduced into grounding level by node m. The voltage of node NT1 is determined by current signal 12 and bias current ^. When the output power MVout' does not reach the predetermined electrical M level, the germanium crystal 2 is 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 IB. When the output voltage Vout' reaches a predetermined voltage level, the transistor T2 is fused to the 姊 region. (4) The current value of the current signal i2 is greater than zero, so as 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 m Quasi-biased to a high voltage level. In the embodiment, the voltage of the node NT1 is used as the control signal SC, and is output to the second measurement after the measurement. &gt; Μ Refer to Fig. 2C', which is a detailed view of the detection unit 2〇8 in Fig. 2A. This example is based on the circuit of the measuring unit including the transistors T3, D4 and T5, the buffer 216 and the gate (AndGate) 218. The source of the transistor T3 receives the high voltage level Vdd, and the gate receives the ground, so that the transistor T3 is always turned on to form a path connected to the voltage level Vdd to set the voltage of the node ντ2. The level is biased to a high voltage level Vdd. The transistors Τ4 and Τ5 are Ν-type MOS transistors. The source of the transistor Τ5 receives the grounding level, and the trace is electrically connected to the source of the body ’4. The gate is used to receive the system enable signal leg. The sum of the body and the body T4 is coupled to the drain of the transistor T3 to form the node nt2, and the pole 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 ΝΤ2 to the ground level, and 1323405

- 达编遗: TW3173PA This ground path is controlled by the control signal % 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 a 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 enable signal ENS is enabled and the control signal sc is at a high voltage level, the system enable signal ENS and the control signal SC respectively enable the transistors T4 and T5 to lower the voltage level of the node NT2. Up to the ground level, the voltage level of the node NT2 is a low voltage level, so that the enable signal EN is a non-enabled level. In this way, the early detection unit can make the enable signal EN' be disabled according to the control level of the voltage level to enable the non-enable charge pump via the timing signal generating unit 202. 204 operation. 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 , • is the level of enabling. Thus, the detecting unit 208 can enable the enable signal EN' as an enable level according to the control signal SC at the low dust level to enable the operation of the charge pump 204 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 2〇2 receives the enable signal EM' to output the timing signal CLK' and the reverse timing signal CUB via the reverse voltage characteristic of the inverter. The charge pump 2〇4 is also, for example, a generally notified charge pump circuit as shown in Fig. 2E. Charge pump 2〇4 13 1323405

Sanda number: TW3173 PA 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 Vout'. 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 (F1 ash). The output voltage Vout' is input to a data line (Bit Line) as a flash memory to supply a voltage to inject electrons into the floating gate of the transistor in the memory cell. To write data; or to provide voltage to suck electrons out of the suspension layer for data removal. In this embodiment, the current values of the current signals II and 12 are substantially the same as an example. The current signals n and 12 may be in any other ratio. In the present embodiment, only the current mirror unit 2 is used as an example of a current mirror including two p-type MOS transistors T1 and T2. However, the current mapping unit 206a is not limited to the structure of the embodiment. Other forms of current mirrors can be called 'Cascode current mirrors' or other circuit structures that can output two current value related current signals. In this embodiment, the charge pump 2〇4 is indirectly controlled by the input of the enable signal EN, and the voltage regulator device 200 of the present embodiment can also select the enable signal pin. The charge pump gw device and the enable signal EN are directly input to the charge pump 204 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 current signals related to two current values according to the output voltage.本实 1323405

Sanda Number: TW3173PA The Zener diode's voltage regulator unit and voltage regulator are used to input one of the current signals to the Zener diode to regulate the output voltage and '· convert another current. The signal is a control signal to determine whether the output voltage has reached a predetermined voltage level based on the control signal. In this embodiment, the voltage stabilizing unit using the Zener diode further feedbacks the control signal to the charge pump to disable the charge pump when the output voltage reaches a predetermined voltage level. In this way, the voltage stabilizing unit using the Zener diode of the embodiment can effectively improve the conventional voltage regulator. The device cannot turn off the charge pump when the output voltage reaches a predetermined voltage level, and has high power consumption and power use efficiency. Low disadvantage, but has the advantage of reducing power consumption and improving power efficiency. In addition, the voltage stabilizing unit and the voltage stabilizing device using the Zener diode of the present embodiment bias the output voltage by using a Zener diode and a current main terminal of the substantially forward biased diode. To the predetermined voltage level, the temperature coefficient of the diode that is passed through is negative. In this way, the diode can be aligned with the nano-polar body to compensate for the temperature coefficient to reduce the effect of temperature on the output signal level. In this way, the voltage stabilizing unit and the voltage stabilizing device using the Zener diode in the embodiment can effectively solve the shortcoming that the output voltage of the voltage stabilizing device using the Zener diode is easily affected by temperature and is offset. And has the advantage that the output voltage level is relatively stable. Furthermore, the voltage stabilizing unit and the voltage stabilizing device using the Zener diode of the present embodiment are stabilized by a simple circuit structure including a Zener diode, a transistor and a logic gate, and a negative feedback circuit. Press and control the effect of the charge pump. In this way, the voltage stabilizing unit and the voltage stabilizing device using the Zener diode of the embodiment can effectively improve the conventional voltage stabilizing device that does not utilize the Zener diode. 15 1323405

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. 1323405

Sanda Number·· TW3173PA [Simple Description of the Drawing] 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. • Fig. 2A is a circuit diagram of a voltage stabilizing device using a Zener diode 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 M' in Figure 2C. Fig. 2E is a detailed circuit diagram of the timing signal generating unit 202 in Fig. 2A. [Main component symbol description] 100, 200 · · Voltage regulator EN, 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 1323405

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: threshold voltage 214. current source NT1, NT2: node IB. Bias current Vdd: high voltage level 216: buffer 218: and gate

Claims (1)

1323405 Three nickname: TW3173PA X. Patent application scope: 1. A voltage stabilizing unit for receiving a charge pump (Charge PumP) ·· outputting a driving voltage and regulating the driving voltage The method includes: a current mapping unit, comprising: a current control terminal and a current slave terminal, wherein the current mapping unit is configured to receive the driving voltage, and generate a signal respectively according to the driving voltage at the current master terminal and the current slave terminal a first electric current signal and a second current signal; a Zener diode, the negative end of the Zener diode is coupled to the current main terminal, and the positive end receives a fixed voltage, the Zener diode Receiving the first current signal, and controlling a voltage level of the driving voltage to be substantially equal to a predetermined voltage level to regulate the driving voltage; and a biasing unit for receiving the second current signal 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; The signal is fed back to the charge pump ' to control the charge pump to generate the drive voltage. 2. The voltage regulator unit of claim 1, wherein the control signal is input to a detection unit, and the detection unit further receives a first enable signal 'based on the first enable signal and the The control signal generates a second enable signal. 3. The voltage regulator 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 and a counter according to the second enabling signal. Two-way time: TW3173PA. 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 pump outputs the drive voltage. 5. The voltage regulator unit of claim 2, wherein the charge pump receives a turn-in voltage and generates the drive voltage based on the input voltage. 6. A voltage stabilizing device comprising: a charge pump (for discharging a driving voltage); a stabilizing unit comprising: a current mapping unit comprising: a current master and a current slave; The current mapping unit is configured to receive the driving voltage, and generate a first current signal and a second current signal respectively at the current main terminal and the current slave terminal according to the driving voltage; a Zener diode 'the Zener The negative terminal of the diode is coupled to the current 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 a predetermined voltage. Leveling 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; a detecting unit 'for receiving the control signal' and generating according to the control signal 20 1323405 three-number: TW3173PA And a timing signal generating unit that receives the first enabling signal and generates a timing signal and a reverse timing signal according to the first activation signal; wherein the timing signal and the reverse The 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