TWI410017B - Processing device and processing system utilizing the same - Google Patents

Abstract

A processing device including an over voltage protection (OVP) module, a first comparing module, a second comparing module and a logic module. The OVP avoids that an output voltage is higher than a threshold voltage. When the output voltage is higher than the threshold voltage, the first comparing module de-activates the OVP module. When the output voltage is lower than a reference voltage, the second comparing module activates the OVP module. When the OVP module is de-activated, the logic module stops providing a switch signal group such that a driving device stops charging a voltage storage device.

Description

Processing device and processing system

The present invention relates to a processing apparatus, and more particularly to a processing apparatus having an overvoltage protection function.

As technology advances, many circuits are integrated into an integrated circuit to reduce the size of electronic products. Electronic products with integrated circuits have the advantages of light weight and thin volume. Many types of digital or analog circuits are currently integrated into integrated circuit types, including complex microprocessors, operational amplifiers, and passive components.

However, some integrated circuits have strict requirements on the power supply voltage. Once the received voltage is greater than the voltage that can be withstood, it can cause damage to the integrated circuit.

The invention provides a processing device coupled to a driving device. The driving device charges a pressure accumulating device according to a switching signal group. Therefore, the pressure accumulator can provide an output voltage. The processing device of the present invention includes an overvoltage protection module, a first comparison module, a second comparison module, and a logic module. The overvoltage protection module is used to prevent the output voltage from being greater than a threshold voltage. When the output voltage is greater than the threshold voltage, the first comparison module disables the overvoltage protection module. When the output voltage is less than a reference voltage, the second comparison module enables the overvoltage protection module. When the overvoltage protection module is disabled, the logic module stops providing the switching signal group, so that the driving device stops charging the pressure accumulating device.

The invention further provides a processing system comprising a pressure accumulating device, a driving device and a processing device. When the pressure accumulator is charged, an output voltage can be provided. The driving device charges the pressure accumulating device according to a switching signal group. The processing device is coupled to the driving device and includes an overvoltage protection module, a first comparison module, a second comparison module, and a logic module. The overvoltage protection module is used to prevent the output voltage from being greater than a threshold voltage. When the output voltage is greater than the threshold voltage, the first comparison module disables the overvoltage protection module. When the output voltage is less than a reference voltage, the second comparison module enables the overvoltage protection module. When the overvoltage protection module is disabled, the logic module stops providing the switching signal group, so that the driving device stops charging the pressure accumulating device.

In order to make the features and advantages of the present invention more comprehensible, the preferred embodiments are described below, and are described in detail with reference to the accompanying drawings.

Figure 1 is a possible embodiment of a processing system of the present invention. As shown, the processing system 100 includes a pressure accumulator 110, a drive 130, and a processing device 150. The processing device 150 is coupled to the driving device 130 and can provide a switching signal group S _CG . The invention does not limit the type of processing device 150. In a possible embodiment, the processing device 150 is a Pulse Width Modulation (PWM) device.

The drive device 130 charges the pressure accumulating device 110 based on the switching signal group S _CG . In this embodiment, the driving device 130 can generate a phase signal to the pressure accumulating device 110 according to the switching signal group S _CG . The present invention does not limit the content architecture of the driving device 130, and any architecture that can charge the pressure accumulating device 110 can be used as the driving device 130.

When the pressure accumulator 110 is charged, the output voltage V _OUT can be supplied to a load (not shown). In the present embodiment, the pressure accumulating device 110 is a capacitor 111, but is not intended to limit the present invention. Those skilled in the art can replace the capacitor 111 with other pressure storage elements.

As shown in FIG. 1, the processing device 150 includes comparison modules 151, 153, an over voltage protection (OVP) module 155, and a logic module 157. When the output voltage V _{OUT is} greater than a threshold voltage, the comparison module 151 disables the overvoltage protection module 155. In addition, the comparison module 153 enables the overvoltage protection module 155 when the output voltage V _{OUT is} less than a reference voltage. In this embodiment, the threshold voltage is greater than the reference voltage.

In a possible embodiment, when the overvoltage protection module 155 is disabled, the logic module 157 stops providing the switching signal group S _CG to stop the driving device 130 from charging the pressure accumulating device 110. Therefore, the output voltage V _OUT starts to drop. In this embodiment, when the output voltage V _{OUT is} less than a reference voltage, the comparison module 153 enables the overvoltage protection module 155.

When the overvoltage protection module 155 is enabled and a predetermined condition is met, the logic module 157 provides the switching signal group S _CG . In a possible embodiment, the preset condition is related to temperature and current, but is not intended to limit the invention. In another possible embodiment, the preset condition is related to the temperature or current of the pressure accumulating device 110, the driving device 130 or the processing device 150.

In a possible embodiment, when the ambient temperature of the driving device 130 is less than a preset value, the preset condition is established. Therefore, if the overvoltage protection module 155 is in an enabled state, the logic module 157 provides the switching signal group S _CG to the driving device 130. In other embodiments, when the current flowing through the pressure accumulating device 110 is less than a predetermined value, it indicates that the preset condition is established.

Figure 2 is a possible embodiment of a driving device of the present invention. As shown, the drive device 130 includes transistors 210, 230 and an energy storage unit 250. The transistors 210 and 230 are connected in series between the operating voltages VDD and GND and are controlled by the switching signals S _C1 and S _C2 in the switching signal group S _CG , respectively. The energy storage unit 250 is coupled between the transistor 210 and the pressure accumulating device 110.

As shown, the gate of the transistor 210 receives the switching signal S _C1 , the drain of which receives the operating voltage VDD , the source of which is coupled to the drain of the transistor 230 and the energy storage unit 250 . In a possible embodiment, the energy storage unit 250 can be an inductor.

In addition, in the present embodiment, the transistor 210 is an NMOS transistor, but is not intended to limit the present invention. Those skilled in the art can replace the transistor 210 with a PMOS transistor, or other kinds of transistors such as FETs, BJTs.

The gate of the transistor 230 of the driving device 130 receives the switching signal S _C2 , the drain of which is coupled to the source of the transistor 210 and the energy storage unit 250 , and the source thereof receives the operating voltage GND . By controlling the switching signals S _C1 and S _C2 , a phase signal can be generated to the voltage accumulator 110.

In the present embodiment, the operating voltage GND is smaller than the operating voltage VDD. Similarly, those skilled in the art can utilize PMOS transistors, or other types of transistors (such as FETs, BJTs) in place of transistor 230.

Figure 3 is a possible embodiment of one of the comparison modules 151 and 153 of the present invention. As shown, the comparison module 151 is comprised of a comparator 310, and the comparison module 153 includes comparators 330 and 350. In a possible embodiment, when the output voltage V _{OUT is} not greater than the threshold voltage REF1.2, the output signal O ₃₁₀ of the comparator ₃₁₀ is at a first level (eg, a high level).

When the output voltage V _{OUT is} greater than the threshold voltage REF1.2, the output signal O _{310 of} the comparator 310 changes from the first level to the second level (eg, low level). Therefore, the overvoltage protection module 155 can be disabled. When the overvoltage protection module 155 is in the disabled state, the logic module 157 stops providing the switching signal group S _CG to the driving device 130.

In addition, when the output voltage V _{OUT is} greater than the reference voltage REF, the output signal O ₃₃₀ of the comparator ₃₃₀ is at a second level (eg, a low level). Comparator 350 compares output signal O ₃₃₀ of comparator ₃₃₀ with reference signal S _T . Since the output signal O ₃₃₀ of the comparator ₃₃₀ is at the second level (eg, 0V), the output signal comp of the comparator 350 is at the second level.

In this embodiment, the reference signal S _T is a triangular wave. In a possible embodiment, the peak value (eg, 2V) and the valley value (eg, 1V) of the reference signal S _T are both greater than the second level (eg, 0V).

When the output voltage V _{OUT is} less than the reference voltage REF, the output signal O _{330 of the} comparator 330 changes from the second level to the first level. Therefore, the output signal comp of the comparator 350 will have a pulse.

In this embodiment, when the output signal O _{310 of the} comparator 310 changes from the first level to the second level, and the output signal comp of the comparator 350 has a pulse, the overvoltage protection module 155 is enabled. . In other embodiments, if the output signal O _{310 of the} comparator 310 changes from the first level to the second level, but the output signal comp of the comparator 350 does not yet have a pulse, the overvoltage protection module 155 is disabled. status.

Since the pulse generated by the comparison module 153 can change the overvoltage protection module 155 from the disabled state to the enabled state in a timely manner, the function of the overvoltage protection can be effectively improved to avoid the prohibition of the overvoltage protection module 155. The energy can be too long to detect the phenomenon that the output voltage V _{OUT is} too high.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements 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.

100‧‧‧Processing system

110‧‧‧Pressure device

130‧‧‧ drive

150‧‧‧Processing device

151, 153‧‧‧ comparison module

155‧‧‧Overvoltage protection module

157‧‧‧Logic Module

210, 230‧‧‧Optoelectronics

250‧‧‧ Energy storage unit

310, 330, 350‧‧‧ comparator

Figure 1 is a possible embodiment of a processing system of the present invention.

Figure 2 is a possible embodiment of a driving device of the present invention.

Figure 3 is a possible embodiment of one of the comparison modules 151 and 153 of the present invention.

100. . . Processing system

110. . . Pressure storage device

130. . . Drive unit

150. . . Processing device

111. . . capacitance

151, 153. . . Comparison module

155. . . Overvoltage protection module

157. . . Logic module

Claims (24)

A processing device is coupled to a driving device, and the driving device charges a pressure accumulating device according to a switching signal group, so that the voltage accumulating device can provide an output voltage, and the processing device comprises: an overvoltage protection module In order to avoid the output voltage being greater than a threshold voltage; a first comparison module, when the output voltage is greater than the threshold voltage, the overvoltage protection module is disabled; and a second comparison module is used as the output voltage When the voltage is less than a reference voltage, the overvoltage protection module is enabled; and a logic module stops providing the switching signal group when the overvoltage protection module is disabled, so that the driving device stops the voltage storage The device is charged, wherein when the output voltage is greater than the threshold voltage, the output signal of the first comparison module is changed from a first level to a second level, and the first level is higher than the second level; The second comparison module includes: a first comparator, generating a comparison signal according to the output voltage and the reference voltage; and a second comparator, generating the signal according to the comparison signal and a triangular wave signal Red signal. The processing device of claim 1, wherein the logic module provides the switching signal group when the overvoltage protection module is enabled and a predetermined condition is met. The processing device of claim 2, wherein the preset condition is related to temperature and current. The processing device of claim 3, wherein the preset condition is established when the ambient temperature of the driving device is less than a predetermined value. The processing device of claim 4, wherein the predetermined condition is established when a current flowing through the pressure accumulating device is less than a predetermined value. The processing device of claim 1, wherein the overvoltage protection module stops the logic module when the output signal of the first comparison module changes from the first level to the second level This switching signal group is provided. The processing device of claim 1, wherein when the overvoltage protection module is disabled, if the output voltage is less than the reference voltage, the second comparator generates a pulse signal. The processing device of claim 7, wherein when the output signal of the first comparison module is changed from the first level to the second level, and the second comparator generates the pulse signal, Then the overvoltage protection module is enabled. The processing device of claim 1, wherein the threshold voltage is greater than the reference voltage. A processing system comprising: a pressure accumulating device, when the accumulator device is charged, an output voltage is provided; a driving device charges the accumulator device according to a switching signal group; a processing device, coupled Connecting the driving device, and comprising: an overvoltage protection module to prevent the output voltage from being greater than a threshold voltage; a first comparison module, when the output voltage is greater than the threshold voltage The overvoltage protection module is disabled; a second comparison module, when the output voltage is less than a reference voltage, enabling the overvoltage protection module; and a logic module when the overvoltage protection When the module is disabled, the switching signal group is stopped from being supplied, so that the driving device stops charging the voltage accumulating device, wherein the driving device comprises: a first transistor, and the first switching signal of the switching signal group Controlled by: a second transistor in series with the first transistor between a first operating voltage and a second operating voltage, and controlled by a second switching signal of the switching signal group; and a storage The energy unit is coupled between the first transistor and the pressure accumulating device. The processing system of claim 10, wherein the pressure storage device is a capacitor. The processing system of claim 10, wherein the gate of the first transistor receives the first switching signal, the drain thereof receives the first operating voltage, and the source thereof is coupled to the second transistor. Bungee and the energy storage unit. The processing system of claim 12, wherein the gate of the second transistor receives the second switching signal, the source thereof receives the second operating voltage, and the second operating voltage is less than the first operating voltage . The processing system of claim 10, wherein the energy storage unit is an inductor. The processing system of claim 10, wherein the logic module provides the switching signal group when the overvoltage protection module is enabled and a predetermined condition is met. The processing system of claim 15, wherein the preset condition is related to temperature and current. The processing system of claim 16, wherein the preset condition is established when the ambient temperature of the driving device is less than a predetermined value. The processing system of claim 17, wherein the preset condition is established when a current flowing through the energy storage unit is less than a predetermined value. The processing system of claim 10, wherein when the output voltage is greater than the threshold voltage, the output signal of the first comparison module is changed from a first level to a second level, the first The level is higher than the second level. The processing system of claim 19, wherein the overvoltage protection module stops the logic module when the output signal of the first comparison module changes from the first level to the second level This switching signal group is provided. The processing system of claim 19, wherein the second comparison module comprises: a first comparator, generating a comparison signal according to the output voltage and the reference voltage; and a second comparator, according to the The comparison signal and a triangular wave signal are generated to generate the pulse signal. The processing system of claim 21, wherein when the overvoltage protection module is disabled, if the output voltage is less than the reference voltage, the second comparator generates a pulse signal. The processing system of claim 22, wherein when an output signal of the first comparison module is changed from the first level to the second level, and the second comparator generates the pulse signal, Then the overvoltage protection module is enabled. The processing system of claim 10, wherein the threshold voltage is greater than the reference voltage.