TW200819943A - A voltage regulator - Google Patents

Abstract

A voltage regulator comprises a switching circuit, a detection circuit, and a short protection circuit. The switching circuit coupled to a power source provides an output power. The detection circuit coupled to the output power generates a compensation signal to control the switching circuit, while the output power is increased or decreased. The output power is modulated by the compensation signal thereof. The short protection circuit, coupled between the compensation signal and a first reference voltage source, sends a warning signal while the voltage regulator is short circuited according to the result of comparing the voltage level of the compensation signal with the first reference voltage.

Description

200819943 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a stable (four) arrangement. In particular, there are regulators with output short-circuit protection. [Prior Art] The power supply tubular limb has been developed to lead the development of the enemy's design, and to provide a different kind of mixing and turning, the method includes the hybrid voltage regulator and the switching device. In the switch surface device, the linearity is stable with low noise, low complexity, and small size, so the skin is tested in various electronic products. As shown in Figure 1, 'No! The figure shows a conventional 1Q block diagram of a low-dropout (L〇wDr叩(10), LDO) linear regulator, including an -off component plus an amplifier 1〇4. The switching element 1Q2 can be a -n-type gold-oxygen half field effect transistor (N-MOSFET) coupled to a power supply & and provides an output voltage ιΐ2 to • V°ut. A first impedance 108 is lightly coupled to the output voltage 112 to generate a feedback signal 106 based on the ratio of the first impedance 108 and a second impedance 11Q. The amplifier 1 〇 4 ′ is controlled according to the feedback signal, and the degree of conduction of the _ component coffee is controlled to control the output power 112. Therefore, the low-destination linear stabilization device reaches 10 degrees to achieve a fixed output voltage II2. In general, linear regulators can be classified into integrated line-fitting II devices and discrete linear-stabilized devices depending on the degree of integration. Integrated linear stabilization device

Clients Docket No. TT s Docket No: ^75-A41〇〇9-TW/Final/Rita/2006/10/15 6 200819943 The power management integrated body of 'switching components, amplifiers and other materials integrated into a single one The circuit' thus saves the layout area of the printed circuit board, and at the same time, the overall cost is reduced due to the reduced number of components. Therefore, when the current is 2 Α or less, the general fit is linear and stable. When designing a rated current greater than the stated circuit, consider the use of discrete linear stabilizers if considering the layout area of the two switching elements such as the 金-type MOS field-effect transistor and its heat dissipation capability. As described above, the low-dropout linear voltage regulator 10' discrete linear touch-up is used to amplify the crying, according to the output impedance of the output to control the components, such as the conductivity level of the 金-type MOS field-effect transistor. 'And then control the output. However, the biggest problem with the discrete linear pressure relief device is that the working state of the paste-crystal and the size of the output flow cannot be known, so it is not possible to design an appropriate protective material, for example, output overcurrent protection, over temperature dependence, or input dislocation. Protection and other devices, resulting in many applications of real & Among them, especially when it is impossible to start up, the design of the road protection circuit device is the most criticized. Conventionally, in order to solve the above problems, the output short circuit protection is achieved by implementing a power-on-time comparison circuit. Please refer to Figure 2, Figure 2 shows the voltage regulator device with feedback voltage comparison circuit. 2〇一-~---------- >Ρ -ώ (MJ; The component 2Q2 is -N = to provide - the output voltage 220 to v 〇 ut. According to the first impedance and the ratio of the second impedance 21 〇 to generate a feedback signal 2Q6. Figure 2

Client's Docket No. TT^ Docket No: 〇975-A41〇〇9-TW/Final^lita/2006/10/15 200819943 214 judgment, when the feedback signal coffee level is lower than - the first - Fort source When the county of 212 is in the county, it indicates that the output short circuit occurs. On this day, the gentry comparator 2 workers 4 will take out a dry guard and protect the road. The two tigers 16 to the relevant control device to initiate the short-cut 疋', wherein the first reference electrical waste source 212: must be lower than the second reference voltage source coupled to the amplifier 2Q4. Avoid the sights and turn the warning money out. Of course

The above-mentioned short-circuit protection Wei, in the system soft ^J system soft start _, the output voltage 22Q. Close. The voltage level of Yucheng Power & 220 is lower than the voltage level of the first-parameter. If not, the comparator 214, the service is crying 21/, the warning signal 216 is output, which will make the system unable to operate normally _ or operate . Also due to: When the system is turned on, the output short-circuit protection cannot be performed. There is a clock here, the invention is connected to n ^ b, a voltage regulator device capable of operating the switch when the system is turned on, Ding Zhiyue b Zhengshi Cui timely debt dating road, and ensuring a fixed The limitation of the technology is one. From the overcoming of the invention [invention] The present invention discloses a voltage stabilizing device 'including: a switch-side circuit,:: the number of the switch circuit to adjust the offset of the wheel power; and the signal protection circuit, _ Compensation News # / 1 Road brother a reference voltage source, based on

Client's Docket No. TT^s Docket No: 〇975.A41〇〇9-TW/FinayRita/2006/l〇/i5 200819943 The voltage level of both the compensation signal and the first reference voltage source determines the voltage regulation Whether the device is short-circuited, and if so, a warning signal is issued. The detection circuit further includes a voltage dividing circuit and an amplifier; the output short circuit protection circuit further includes a comparator; and the switching transistor system is a switching transistor. The invention further discloses a voltage stabilizing device comprising: a switch circuit, a detecting circuit, and an output short circuit protection circuit. The switch circuit is coupled to a power supply to provide one of the required output powers for the load. The detection circuit is coupled to the output power source and provides a compensation signal for adjusting the output power of the offset. The output short circuit protection circuit is coupled to the detection current and a first reference current source, and determines whether the voltage regulator has an output short circuit according to the detected current value and the current value of the first reference current source, and if so, outputs A warning signal. The detection circuit further includes a voltage dividing circuit and an amplifier; the switching circuit is a switching transistor; and the output short circuit protection circuit further includes a comparator. The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Please refer to Figure 3. Figure 3 is a block diagram showing a voltage stabilizing device 30 consistent with an embodiment of the present invention. The voltage regulator device 30 includes a switch circuit 32, a detection circuit 34, and an output short circuit protection circuit 36. The switch circuit 32 is coupled

Client's Docket No. TT^ Docket No: 0975-A41009-TW/Final/Rita/2006/10/15 9 200819943 The power source vln is used to provide an output voltage U. The traverse circuit 34 is coupled to the output s31. When the voltage level of the output voltage S3i rises or falls, the circuit 34 outputs a compensation signal S32 to the switch circuit 32 to adjust the output of the offset. Voltage & The detection circuit 34 includes an eight-Chen-Cheng, a knife circuit 302 and an amplifier 3〇4, the voltage dividing circuit 3 0 2 _ connected to the private mountain φ two, 0 x — money μ output power ^ S3i and output a feedback signal S33; and the amplification benefit 3Q4 is connected - the second reference voltage source V32 and the feedback signal 33 are based on the voltage level of the signal center 3 and the voltage level of the second reference voltage source V32 Comparing the error value to generate the compensation signal y, the output short circuit protection circuit 36 is lightly connected to the compensation signal k and the reference power source ~, if the voltage level of the compensation signal s32 is higher than the first reference The voltage level of the voltage source V31 indicates that the output short circuit occurs, and the input (four) way protection circuit 36 outputs a warning signal & to the relevant control device to initiate short circuit protection. The output short circuit protection path 36 includes a comparator 3〇6, and the compensation signal ^ and the first reference voltage source are switched, and the compensation signal and the electromigration level of the compensation signal & The voltage level is used to judge the occurrence of the round trip. The related working principle will be further explained as follows. Referring to Fig. 4, Fig. 4 is a circuit diagram showing a dust holding device 40 according to an embodiment of the present invention, comprising: a switch circuit 42, a test circuit 44, and an output short circuit protection circuit. The output short circuit protection circuit π can be packaged

Client's Docket No. m Docket No: 0975.A41009.TW/FinayRita/2006/10/15 200819943 includes a comparator 4〇6 coupled to a first reference voltage source V41 and one of the compensation circuits 44 provided. Signal S42, and output a warning signal to the relevant control device to initiate short circuit protection. The detection circuit 44 includes a voltage dividing circuit 4〇2 and an amplifier 4〇4. The voltage dividing circuit 4〇2 may further include a first impedance R1 and a second impedance r2; the two input terminals of the amplifying circuit 4 4 are connected to a second reference voltage source Vu and the minute The feedback circuit s43 provides a feedback signal s43, and compares the error value according to the voltage level of the _ feedback signal S43 and the voltage level of the second reference voltage source to generate the compensation signal S42. . The switch circuit 42 is a switch transistor. In some embodiments, it can be an n-type metal oxide half field effect transistor (N-MOSFET) having an input terminal (drain) connected to the power source Vin. A control terminal (gate) is coupled to the compensation signal S42, and an output terminal (source) provides an output voltage S41. In this way, the amplifier 4〇4 can generate an appropriate voltage change at the control terminal (gate) of the switching transistor 42 according to the output voltage to control the conduction degree of the switching transistor 42, thereby controlling the output. Voltage. Under steady-state operation, the switching transistor 42 operates in a saturated working region. Therefore, the input current of the 5H switching transistor 42, such as the drain current, can be expressed as follows, =1ZXMXC0X x — x{VGS - Vmf Δ L ( 1 1 *

Client's Docket No. TT's Docket No: 0975-A41()09-TW/Final/Rita/2006/10/l5 200819943 . ? y 1 Μ J/XC〇ZXI is a constant; L is the switching transistor The gate voltage level of 4 2; and ~ is the S-value voltage value of the switching transistor 4 2 .

And the voltage level of the output voltage Su can be expressed as follows, Wrefx^i±M ^ (2); /, the re / system represents the voltage level of the reference voltage source v42. It can be seen from the above equation that when the output of the t system is loaded, the voltage level of the output voltage S41 is lowered, so that the feedback signal S43 of the first impedance Ri and the second impedance R2 is also decreased, and the amplifier reacts. 7 outputting the offset voltage of the output voltage S41 and outputting the rising compensation signal I, thereby increasing the voltage level of the control terminal (gate) of the switching transistor 42 to enhance the conduction level of the switching transistor 42, thereby causing more current to pass. The _ switch transistor 42 further returns the voltage level of the output voltage S4i. In general, the response time for this change varies from design to design, ranging from a few microseconds to tens of microseconds. When the control terminal (gate) voltage level of the switch transistor 42 is higher than the voltage level of the first reference voltage Vu, the comparator 406 determines that an output short circuit occurs, and provides the warning signal S44 to the relevant control device. Start short circuit protection. In order to avoid the transient change, the comparison outputs the warning signal s44 for 4 〇6 misjudgment. In an embodiment,

Clients Docket No. m Docket No: 〇975-A41009-TW/FiiiaiyRita/20〇6/10/15 12 200819943 The low-pass chopper circuit 48 is coupled to the comparator 46 to ignore the warning below a predetermined time. Signal S44. Referring to FIG. 5, FIG. 5 is a circuit diagram showing a stabilization device 50 consistent with another embodiment of the present invention, including: a switch circuit 52, a detection circuit 54, a thin resistor Rgs, and an output short circuit protection circuit. 56. In the present example, the switch circuit 52 is a switching transistor 52, such as an N-type MOSFET, and its input terminal (drain) is coupled to a power supply ▽in, Its control terminal (gate) is coupled to a compensation signal S52, and an output (source) is coupled to an output voltage S5i. Therefore, as described in the above embodiment, the present embodiment also generates a corresponding compensation signal & according to the change of the output voltage S51 through the amplifier 5Q4 to change the control terminal (gate) voltage of the switching transistor 52. The level, that is, the degree of conduction of the switching transistor 52 is controlled, thereby controlling the output voltage Ssi, thereby achieving the purpose of providing a fixed voltage. Different from the conventional embodiment, the output short circuit protection circuit 56 of the present example includes a current comparator 5〇6 coupled to the compensation signal S52 and a first reference current source iref. When the voltage level of the output voltage Ssi is unchanged, that is, in the steady state operation, the control transistor (gate) current value of the switch transistor 52 is zero, therefore, the detection resistor is lightly connected in parallel. Cooperating with the control terminal (gate) to the output (source) of the switching transistor (gate) to the output (source)

Client's Docket No. TT5s Docket No: 〇975-A41009-TW/Final^ita/2006/10/l5 13 200819943 The voltage vGS is proportional to one of the detection currents Igs. When the voltage level of the output voltage is shifted, the detection current gs also changes relatively slightly. However, when the output device is short-circuited, the (IV) current Igs will increase at the same time. Therefore, through the current comparator 5〇6, the debt current Igs and the reference current value ref are compared. When the side current Igs is greater than Iref, the comparator S6 determines that the voltage regulator has an output short circuit, and sends a warning signal Ss4 to the associated control device to initiate short circuit protection. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and the present invention may be modified and modified without departing from the spirit and scope of the present invention. The scope of protection shall be subject to the definition of the scope of the benefits of the company. Lu

Client's Docket No· TT's Docket No: 0975-A41009-TW/Fiml/Rita/2006/10/l5 14 200819943 [Simplified Schematic] Figure 1 shows a block diagram of a conventional low-dropout linear regulator device; The figure shows a block diagram of a voltage stabilizing device of a conventional feedback voltage comparison circuit; FIG. 3 is a block diagram showing a voltage stabilizing device consistent with the embodiment of the present invention; and FIG. 4 is a view showing the stability of the embodiment of the present invention. FIG. 5 is a circuit diagram showing a voltage stabilizing device in accordance with another embodiment of the present invention. [Main component symbol description] 40~ voltage regulator device; 4 4 ~ ^ (test circuit, 4〇2~ voltage divider circuit; 4 0 6~ comparator;

Ri~1st impedance; V41~first reference voltage source▽42~弟二reference voltage source s41~output voltage; 5 4 3 ~ feedback signal; 4 2~switch circuit; output short circuit protection circuit; 404~ amplifier; R2 ~ second impedance; 5 4 2 ~ compensation signal; S 4 4~ police no signal.

Client’s Docket No. TT^ Docket No: 0975-A41009-TW/Final/Rita/2006/10/l5 15

Claims (1)

200819943 X. Patent application scope: 1. A voltage regulator device, comprising: - a switch circuit 'coupling-power supply' for providing a load-detection circuit, and a face-to-face transmission, when the _2 ==; Output-compensation signal controls the switching circuit to bias the output power; Output short circuit protection circuit, consuming the compensation signal and a first reference voltage source 'according to the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Miscellaneous. Qiqi 2. As claimed in the scope of application:: The measuring circuit includes: M and a voltage dividing circuit, which is connected to the output power source to output a feedback signal; The second reference voltage source and the feedback signal are recorded according to the feedback signal and the second reference electric red-ratio wheel to record the compensation signal 0 3 · The voltage regulator device as described in the first item of the transfer surface Wherein the switching circuit is a -switching transistor, wherein an input end of the switching transistor is coupled to the power supply, the switching transistor is coupled to the compensation signal, and the output terminal of the switching transistor This output power is supplied. Client's Docket No. TT's Docket No: 0975-A41009-TW/Fina]/Rjta/2006/K)/15 200819943 4 · The voltage regulator device described in the patent, wherein the output short circuit protection circuit includes - The comparator screams the compensation signal and the first reference electrical source source' compares the voltage level of the compensation signal with the first reference voltage level to determine that the output of the dust holding device is shorted. 5. The voltage regulator device of claim 2, wherein the value of the output power source is determined by the second reference level of the scale and the resistance division ratio of the voltage dividing circuit. _ 6· A voltage stabilizing device comprising: a switching circuit 'secret-power supply for providing a load--turning power supply; a pre-measure circuit connected to the output power supply, when the output power supply rises or falls, The detection circuit output-compensation signal controls the switching circuit to adjust the output power of the offset; ^ - the resistor, the wheel of the side circuit and the source of the input (4) to generate a detection current; and • _ output The short circuit protection circuit 'connects the detection current and a first reference current source, and according to the current value and the current value of the first reference current source, judges whether the output is short-circuited, and if so, the wheel A warning signal is issued. 1. The voltage regulator device of claim 6, wherein the detection circuit comprises: ^ ' a voltage divider circuit coupled to the output power source for outputting a feedback signal and an amplifier, Coupling a second reference voltage source and the feedback signal according to 哕Clienfs Docket No. TT^ Docket No: 〇975-A41009-TW/Final/Rita/2006/10/15 17 200819943 feedback signal and the second One of the reference voltages compares the error value to the production number.噙 偿 偿 钒 钒 。 。 。. In the voltage regulator device of the sixth aspect of the patent, the circuit of the circuit is a switch transistor, the wheel of the transistor is connected to the power source, and the control system is controlled by the control system. The meal signal, and one of the switch transistors, provides the output wire read compensation. 9. The dust holding device according to claim 6, wherein: the short circuit protection circuit includes a comparator, _ the current And the first-parameter source is used to compare the copper current value and the first reference current value to determine the output short circuit of the =. %保裳 1〇· As claimed in the patent scope 帛7, the voltage value of the wheel is determined by the second reference level and the voltage-to-resistance ratio of the divided voltage. Client’s Docket No. TT5s Docket No: 〇975-A41009-TW/Final/Rita/2006/10/15