KR100660856B1 - Apparatus for monitoring plural voltages - Google Patents

Abstract

A multiple voltage monitoring device is disclosed. The plurality of voltage monitoring apparatuses according to the present invention determine a plurality of nodes each having a separate voltage, a plurality of resistors connected between each of the plurality of nodes and the monitoring node, a common resistor connected between the monitoring node and the ground, and a voltage of the monitoring node. And a voltage monitoring circuit for detecting a voltage change of the plurality of nodes by comparing with a threshold voltage of. According to the present invention, one voltage monitoring circuit may be used to monitor voltages of a plurality of nodes.

Description

Apparatus for monitoring plural voltages

1A is a schematic diagram of a conventional voltage monitoring apparatus.

FIG. 1B is a first detail view of FIG. 1A.

FIG. 1C is a second detail view of FIG. 1A.

2 is a schematic diagram of an electrical circuit relating to an HDD according to an embodiment of the present invention.

3 is a circuit diagram of a plurality of voltage monitoring apparatus in the electrical circuit of FIG.

The present invention relates to a voltage monitoring apparatus, and more particularly, to an apparatus for monitoring a voltage change of a plurality of nodes.

In general, voltage monitoring in a hard disk drive (HDD) is performed through a voltage monitoring circuit inside a combo integrated circuit (IC).

1A is a schematic diagram of a conventional voltage monitoring apparatus. Referring to FIG. 1A, a node 110 is a node for which a voltage is to be monitored. Currently, the voltage at node 110 is 3.3V. However, the voltage at node 110 may vary. In order to detect such a voltage change, the node 110 is connected to the combo IC 170 of the HDD.

There is a voltage monitoring circuit inside the combo IC 170 of the HDD. The voltage change of the node 110 is sensed through a voltage monitoring circuit inside the combo IC 170.

FIG. 1B is a first detail view of FIG. 1A. Referring to FIG. 1B, a voltage monitoring circuit 180 is connected to the monitoring node 130.

Ra 120 is connected between node 110 and monitoring node 130 and Rb 140 is connected between monitoring node 130 and ground 150. Accordingly, the voltage at node 110 is distributed to Ra 120 and Rb 140.

The threshold voltage and the allowable value are set in the voltage monitoring circuit 180. For example, a threshold voltage of 2.2 V and a tolerance of ± 5% are set. The values of Ra 120 and Rb 140 are set such that the voltage of the monitoring node 130 has a threshold voltage of 2.2V of the voltage monitoring circuit 180 when the voltage of the node 110 is 3.3V.

The voltage monitoring circuit 180 compares the voltage of the monitoring node 130 with a threshold voltage of 2.2V. The voltage monitoring circuit 180 detects a voltage change of the monitoring node 130 according to whether the voltage of the monitoring node 130 is within ± 5% of 2.2V.

The voltage of the monitoring node 130 changes with the voltage of the node 110 accordingly. Accordingly, the voltage change of the node 110 is sensed by the voltage monitoring circuit 180 detecting the voltage change of the monitoring node 130.

FIG. 1C is a second detail view of FIG. 1A. Referring to FIG. 1C, a voltage monitoring circuit 180 is connected to the monitoring node 130. In addition, an Rc 160 is connected between the node 110 and the monitoring node 130. Accordingly, the voltage at node 110 is distributed to Rc 160 and voltage monitoring circuit 180.

The value of Rc 120 is set such that the voltage of the monitoring node 130 has a threshold voltage of 2.2V of the voltage monitoring circuit 180 when the voltage of the node 110 is 3.3V. As shown in FIG. 1B, the voltage change of the voltage node 110 is sensed by the voltage monitoring circuit 180 detecting the voltage change of the monitoring node 130.

In a conventional voltage monitoring apparatus, one voltage monitoring circuit monitors a voltage of a single node. The number of voltage monitoring circuits is fixed inside the combo IC of the HDD. Therefore, there is a problem in that the number of nodes capable of monitoring the voltage is limited.

In addition, if a voltage monitoring circuit is added inside the combo IC to monitor the voltages of more nodes, the cost increases.

An object of the present invention is to provide a multi-voltage monitoring device for monitoring the voltage of a plurality of nodes using a single voltage monitoring circuit.

According to one or more exemplary embodiments, a plurality of voltage monitoring devices may include a plurality of nodes each having a separate voltage, a plurality of resistors connected between each of the plurality of nodes and a monitoring node, and the monitoring node. And a monitoring circuit that senses a voltage change of the plurality of nodes by comparing a voltage connected between the resistor and a voltage of the monitoring node with a predetermined threshold voltage.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a schematic diagram of an electrical circuit for a hard disk drive (HDD) according to an embodiment of the present invention. Referring to FIG. 2, the circuit 150 may include a pre-amplification circuit 152 connected to the head 110. Pre-amplification circuit 152 has a read data channel 154 and a write data channel 156 connected to read / write channel circuit 162.

The pre-amplifier circuit 152 also has a read / write enable gate 160 connected to the controller 164. Data may be written to or read from disk 102 by enabling read / write enable gate 160.

Read / write channel circuit 162 is coupled to control unit 164 through read and write channels 166 and 168, respectively, and through read and write gates 170 and 172, respectively. Read gate 170 is enabled when data is to be read from disk 102. The write gate 172 should be enabled when writing data to the disc 102.

The controller 164 may be a digital signal processor operating according to a software routine. Here, the software routine includes a routine for writing and reading data from the disk 102.

The controller 164 can be coupled to the non-volatile memory device 176. For example, non-volatile memory device 176 may be a read memory (“ROM”). The non-volatile memory device 176 can store instructions for operating the controller 164 and the HDD 100. Alternatively, the controller 164 may have firmware for operating the HDD 100.

Read / write channel circuit 162 and controller 164 may also be connected to motor control circuit 174 that controls voice coil motor and spindle motor 104 of HDD 100.

The motor control circuit 174 includes a combo integrated circuit (IC). The combo IC includes a plurality of voltage monitoring devices. The multi-voltage monitoring apparatus monitors voltages of the multi-nodes by sensing a voltage change of one monitoring node.

The motor control circuit 174 controls the voice coil motor and the spindle motor 104. The motor control circuit 174 may control the voice coil motor and the spindle motor 104 according to the voltage change of the plurality of nodes monitored by the plurality of voltage monitoring devices.

For example, the motor control circuit 174 controls the operation of A to be performed when the voltages of the plurality of nodes individually have a predetermined voltage, and if the voltage of one node among the voltages of the plurality of nodes changes, the operation of B may be B. The operation may be controlled to be performed.

3 is a circuit diagram of a plurality of voltage monitoring apparatus in the electrical circuit of FIG. Referring to FIG. 3, a plurality of voltage monitoring apparatuses are provided between a plurality of nodes 310-1 to 310-5, each of the plurality of nodes 310-1 to 310-5, and a monitoring node 330 having respective voltages. The plurality of resistors 320-1 to 320-5 connected to each other include a resistor 340 and a voltage monitoring circuit 380 connected between the monitoring node 330 and the ground 350.

The voltage of the first node 310-1 V1, the voltage of the second node 310-2 V2, the voltage of the third node 310-3 V3, and the voltage of the fourth node 310-4 The voltage at V4 and the fifth node is referred to as V5. The values of V1 through V5 are variable.

The first resistor 320-1 is connected between the first node 310-1 and the monitoring node 330. The second resistor 320-2 is connected between the second node 310-2 and the monitoring node 330. The third resistor 320-3 is connected between the third node 310-3 and the monitoring node 330. The fourth resistor 320-4 is connected between the fourth node 310-4 and the monitoring node 330. The fifth resistor 320-5 is connected between the fifth node 310-5 and the monitoring node 330.

The first resistor 320-1 has R 1 [Ω]. The second resistor 320-2 has R 2 [Ω]. The third resistor 320-3 has R 3 [Ω]. The fourth resistor 320-4 has R 4 [Ω]. The fifth resistor 320-5 has R 5 [Ω].

The sixth resistor 340 is connected between the monitoring node 330 and the ground 350. The sixth resistor 340 has R6 [ohm].

The voltage monitoring circuit 380 is connected to the monitoring node 330. The voltage monitoring circuit 380 senses a voltage change of the first to fifth nodes 310-1 to 310-5 by comparing the voltage of the monitoring node 330 with a predetermined threshold voltage.

In the voltage monitoring circuit 380, predetermined threshold voltages and allowable values are set. For example, a threshold voltage of 2.2 V and a tolerance of ± 5% are set.

If the voltage at the monitoring node 330 is Vm, the voltage monitoring circuit 380 compares Vm with a threshold voltage of 2.2V. The voltage monitoring circuit 380 detects a voltage change of the monitoring node 330 according to whether Vm is within ± 5% of 2.2V.

The first to sixth resistors 320-1 to 320-5 and 340 may have a voltage Vm of the voltage monitoring circuit 380 when the first to fifth nodes 310-1 to 310-5 have a predetermined voltage. Is adjusted to have a threshold voltage of.

For example, the first to sixth resistors 320-1 to 320-5 and 340 have V1 to V5 at predetermined voltages of 3.3 [V], 3.5 [V], 3.5 [V], 3.3 [V], When 3.1 [V], Vm is adjusted to be 2.2 [V].

Hereinafter, adjustment of the first to sixth resistors 320-1 to 320-5 and 340 will be described.

In FIG. 3, a current flowing through each resistor is represented by Equation 1 below.

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The relationship between i1 and i6 is shown in Equation 2 below.

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Substituting Equation 1 into Equation 2 is the same as Equation 3 below.

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When Vm is obtained from Equation 3, Equation 4 is obtained.

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Since the threshold voltage of the voltage monitoring circuit 380 is 2.2 [V] and Vm is set to the threshold voltage of the monitoring circuit 380, 2.2 is substituted into Vm of Equation (4). The predetermined voltage of the first node 310-1 is 3.3 [V], the predetermined voltage of the second node 310-2 is 3.5 [V], and the predetermined voltage of the third node 310-3 is 3.5 [V]. Since the predetermined voltage of the fourth node 310-4 is 3.3 [V] and the predetermined voltage of the fifth node 310-5 is 3.1 [V], 3.3 in V1, 3.5 in V2 and 3.5 in V3. Replace 3.5, 3.3 for V4, and 3.1 for V5.

Then, equation (4) becomes the following equation (5).

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Now, in Equation 5, R1 to R6 are set using a trial and error method. In other words, various values are substituted into R1 to R6, and the values of R1 to R6 where the right side becomes 2.2 like the left side are found. Through this process, R1 to R6 may be determined.

R1 to R6 determined in this way is V1 to V5 is a predetermined voltage (V1 = 3.3 [V], V2 = 3.5 [V], V3 = 3.5 [V], V4 = 3.3 [V], V5 = 3.1 [V]) Vm is brought to the threshold voltage (2.2 [V]) of the voltage monitoring circuit 380.

On the other hand, assuming that the values of the resistors in the equation (4) R1 = R2 = R3 = R4 = R5 = R6 = 10 [kΩ] and summarized as in the following equation (6).

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In Equation 6, if any one of V1 to V5 changes, Vm changes accordingly. That is, when any one of the voltages V1 to V5 of the first to fifth nodes 310-1 to 310-5 changes, the voltage Vm of the monitoring node 330 also changes accordingly.

The voltage change of the monitoring node 330 is sensed by the voltage monitoring circuit 380. Therefore, the voltage monitoring circuit 380 detects the voltage change of the monitoring node 330 so that the plurality of voltage monitoring devices can detect the voltage change of the first to fifth nodes 310-1 to 310-5. have.

In FIG. 3, the node to which the voltage monitoring circuit 380 directly monitors the voltage is one monitoring node 330 as in the related art. However, the node capable of substantially voltage monitoring is extended to the first to fifth nodes 310-1 to 310-5. As a result, the voltage monitoring apparatus may monitor voltages of the plurality of nodes 310-1 to 310-5 using one voltage monitoring circuit 380.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention.

In the present embodiment, the plurality of voltage monitoring apparatus monitors the voltages of the five nodes 310-1 to 310-5. However, this is merely an example. The multi-voltage monitoring device is capable of monitoring two or more multi-nodes.

In the present embodiment, the values of the first to sixth resistors 320-1 to 320-5 and 340 are adjusted according to the threshold voltage of the voltage monitoring circuit 380. However, this is merely an example. If the threshold voltage of the voltage monitoring circuit 380 is adjustable, the threshold voltage of the voltage monitoring circuit 380 may be adjusted according to the values of the first to sixth resistors 320-1 to 320-5 and 340. will be.

In the present embodiment, a plurality of voltage monitoring apparatuses used in the combo chip of the HDD have been described. However, this is merely an example. The present invention can also be used in the technical field other than HDD. In addition to the combo chip of the HDD, it can be used in any SOC (System On Chip) that monitors two or more voltages in common using one voltage monitoring circuit.

Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, one voltage monitoring circuit may be used to monitor voltages of a plurality of nodes. This expands the number of nodes that one voltage monitoring circuit can monitor.

Since it is possible to monitor the voltages of more nodes using a limited voltage monitoring circuit, the cost of adding a voltage motoring circuit to monitor the voltages of more nodes is saved.

Claims (2)

A plurality of nodes each having a separate voltage; A plurality of resistors coupled between each of the plurality of nodes and a monitoring node; A common resistor coupled between the monitoring node and ground; and And a voltage monitoring circuit for detecting a voltage change of the plurality of nodes by comparing the voltage of the monitoring node with a predetermined threshold voltage. The method of claim 1, wherein the plurality of resistors and the common resistor are: And the monitoring node has a threshold voltage of the monitoring circuit when the plurality of nodes have a predetermined voltage.

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